Tesis sobre el tema "Dissolved heavy metal ion"
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Terdkiatburana, Thanet. "Simultaneous removal process for humic acids and metal ions by adsorption". Thesis, Curtin University, 2007. http://hdl.handle.net/20.500.11937/1714.
Texto completoTerdkiatburana, Thanet. "Simultaneous removal process for humic acids and metal ions by adsorption". Curtin University of Technology, Dept. of Chemical Engineering, 2007. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=18564.
Texto completoAdsorption is approved as an effective and simple method for water and wastewater treatment process. Many adsorbents then are developed for use in adsorption process such as montmorillonite, peat, activated carbon, etc. In this research, humic acid and heavy metals were mainly selected for adsorption study. In the sorption experiment, several adsorbents such as synthesised zeolite (SZ), natural zeolite (NZ), powdered activated carbon (PAC) and fly ash (FA), were selected to examine the application of HA and heavy metals both in individual and simultaneous adsorption, The characteristics and interactions of the adsorbents with HA and heavy metals were systematically studied by batch laboratory experiments. In the beginning, the adsorption of HA onto SZ, NZ, PAC and FA was investigated and their adsorption capacity was compared. The equilibrium adsorption of HA on SZ, NZ, PAC and FA was found to be 84.1, 67.8, 81.2 and 34.1 mg/g, respectively, at 30 oC and pH 5.0. Dynamic adsorption data show that these adsorbents could reach their adsorption equilibrium after 50 hours. From pH analysis, HA adsorption is favoured at low pH and an increase in pH will lead to the reduction of HA adsorption. SZ and NZ adsorption capacity were affected by the changing of solution temperature; however, in PAC and FA sorption study, there was no significant effect observed. Two heavy metal ions (Cu, Pb) removal by the adsorbents was then conducted. The results showed that the equilibrium sorption capacity of Cu and Pb ions on SZ, NZ, PAC and FA were 43.5, 24.2, 19.7, 28.6 and 190.7, 129.0, 76.8 mg/g, respectively at 30 oC and a pH value of 5. The appropriate pH for Cu and Pb removal was found to be 5 and 6. In most dynamic cases, these adsorbents needed at least 50 hours to reach the adsorption equilibrium. Only adsorption on FA required more than 150 hours to reach the equilibrium.
In simultaneous adsorption experiments, the influences of HA and heavy metal concentration (in the range of 10 to 50 mg/L for HA and 10 to 30 mg/l for heavy metals) on the HA-heavy metal complexation were investigated. The results demonstrated that increasing HA concentration mostly affected Cu adsorbed on SZ, FA and PAC and Pb adsorbed on SZ, NZ and PAC. For HA adsorption, the adsorption rate decreased rapidly with increased initial metal ion concentration. Moreover, the adsorption of heavy metals increased with increased heavy metals concentration in the presence of HA. In the presence of heavy metal ions, the order of HA adsorption followed PAC > FA > SZ > NZ. According to the results, the individual and simultaneous adsorption of HA and heavy metals on each adsorbent achieved a different trend. It mainly depended on the adsorption property of both adsorbates (HA and heavy metals) and adsorbents (SZ, NZ, PAC and FA) and also the operation factors such as pH, concentration, temperature and operation time. Even though this experiment could not obtain high adsorption performance, especially in coadsorption, as compared with other adsorbents, the adsorbents in this study represented a higher adsorption capacity and provide the potential for further development.
Satofuka, Hiroyuki. "Studies on heavy metal ion-binding peptides : Application for heavy metal ion detection and detoxification". 京都大学 (Kyoto University), 2002. http://hdl.handle.net/2433/149818.
Texto completoRozycki, Torsten von. "Computational investigations of divalent heavy metal ion homeostasis". kostenfrei, 2009. http://nbn-resolving.de/urn:nbn:de:gbv:3:4-359.
Texto completoLozenko, Sergii. "Heavy metal ion sensors based on organic microcavity lasers". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2011. http://tel.archives-ouvertes.fr/tel-00744846.
Texto completoSteinbaugh, Gregory E. "Heavy metal Ion transport utilizing natural and synthetic ionophores". The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1189785736.
Texto completoMa, Yiu Wa. "Fixed bed removal of heavy metal ions by chelating ion exchange". Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491880.
Texto completoJayasinghe, Manori. "Heavy-metal-ion transport in nanoporous selective-membranes theory and experiment /". Cincinnati, Ohio : University of Cincinnati, 2007. http://www.ohiolink.edu/etd/view.cgi?acc%5Fnum=ucin1186764159.
Texto completoTitle from electronic thesis title page (viewed Oct. 8, 2007). Includes abstract. Keywords: gamma alumina membranes, heavy-metal-ion transport, uranyl, membrane functionalization, nanoporous membranes, steering molecular dynamics, free energy study, liquid-liquid interface, water/hexane interface, tri-butyl phosphate. Includes bibliographical references.
JAYASINGHE, MANORI I. "HEAVY-METAL-ION TRANSPORT IN NANOPOROUS SELECTIVE-MEMBRANES: THEORY AND EXPERIMENT". University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1186764159.
Texto completoSekhula, Koena Sinah. "Heavy metal ion resistance and bioremediation capacities of bacterial strains isolated from an Antimony Mine". Thesis, University of Limpopo, 2005. http://hdl.handle.net/10386/139.
Texto completoSix aerobic bacterial strains [GM 10(1), GM 10 (2), GM 14, GM 15, GM 16 and GM 17] were isolated from an antimony mine in South Africa. Heavy-metal resistance and biosorptive capacities of the isolates were studied. Three of the isolates (GM 15, GM 16 and GM 17) showed different degrees of resistance to antimony and arsenic oxyanions in TYG media. The most resistant isolate GM 16 showed 90 % resistance, followed by GM 17 showing 60 % resistance and GM 15 was least resistant showing 58 % resistance to 80 mM arsenate (AsO4 3-). GM 15 also showed 90 % resistance whereas isolates GM 16 and GM 17 showed 80 % and 45 % resistance respectively to 20 mM antimonate (SbO4 3-). Arsenite (AsO2 -) was the most toxic oxyanion to all the isolates. Media composition influenced the degrees of resistance of the isolates to some divalent metal ions (Zn2+, Ni2+, Co2+, Cu2+ and Cd2+). Higher resistances were found in MH than in TYG media. All the isolates could tolerate up to 5 mM of the divalent metal ions in MH media, but in TYG media, they could only survive at concentrations below 1 mM. Also, from the toxicity studies, high MICs were observed in MH media than TRIS-buffered mineral salt media. Zn2+ was the most tolerated metal by all the isolates while Co2+ was toxic to the isolates. The biosorptive capacities of the isolates were studied in MH medium containing different concentrations of the metal ions, and the residual metal ions were determined using atomic absorption spectroscopy. GM 16 was effective in the removal of Cu2+ and Cd2+ from the contaminated medium. It was capable of removing 65 % of Cu2+ and 48 % of Cd2+ when the initial concentrations were 100 mg/l, whereas GM 15 was found to be effective in the biosorption of Ni2+ from the aqueous solutions. It was capable of removing 44 % of Ni2+ when the initial concentration was 50 mg/l. GM 17 could only remove 20 % of Cu2+ or Cd2+. These observations indicated that GM 16 could be used for bioremediation of xvi Cu2+ and Cd2+ ions from Cu2+ and Cd2+-contaminated aqueous environment, whereas GM 15 could be used for bioremediation of Ni2+.
National Research Foundation and the University of the North Research Unit
Jia, Yong Feng. "Adsorption of heavy metal ion species from aqueous solution in activated carbon". Thesis, University of Newcastle Upon Tyne, 2000. http://hdl.handle.net/10443/519.
Texto completoPitcher, Sarah. "Investigation of heavy metal removal from motorway stormwater using inorganic ion exchange". Thesis, University of Surrey, 2002. http://epubs.surrey.ac.uk/804873/.
Texto completoSun, Xin. "Organofunctional silica mesostructures with improved accessibility and applications as heavy metal ion adsorbents". Diss., Connect to online resource - MSU authorized users, 2008.
Buscar texto completoBaker, Alexander Roberts. "Proton and metal ion interactions of fulvic acid solution and of alumina and alumina/fulvic acid suspensions". Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314936.
Texto completoKothalawala, Kothalawalage Nuwan. "Nanoporous high surface area silicas with chelating groups for heavy metal ion adsorption from aqueous solution /". View online, 2010. http://repository.eiu.edu/theses/docs/32211131524422.pdf.
Texto completoMahdi, Zainab A. "Single and Multicomponent Heavy Metal Ion Adsorption from Aqueous System Using Biochar Derived from Date Seed Biomass". Thesis, Griffith University, 2019. http://hdl.handle.net/10072/387300.
Texto completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
Full Text
Dietrich, Theo Henry. "The removal of heavy metals from dilute aqueous streams by the use of ion exchange resins". Thesis, Cape Technikon, 1998. http://hdl.handle.net/20.500.11838/887.
Texto completoIon exchange resins are widely used to remove or concentrate heavy metals from aqueous solutions or slurries.This thesis attempts to properly evaluate the interaction between ion exchange resins and heavy metals at trace metal concentrations.The durability of the resins and their effectiveness in real slurries were also investigated. In this study, a chelating resin, as well as a cation, and anion exchange resin was contacted with aqueous solutions of heavy metals in both free and complexed form. Zinc, nickel and copper cyanide complexes were adsorbed onto the anion exchange resin, while the chelating and cation exchange resins were contacted with zinc and nickel nitrates, and cupric sulphate. All the tests were conducted in batch stirred tank reactors. All the metal cyanide complexes behaved in a similar manner when contacted with the anion exchange resins. These tests were p~rf0nned under variations in temperature, stirring speed, pH., ionic strength and . initial metal 90E~entrations. Fitting of a dual resistance model to the profiles for thetlptllk:e" of the complexes, show that both film diffusion and intraparticle diffusion rates were improved with an increase in temperature, and that film diffusion rates improved with an increase in stirring speed. A high ionic strength negatively affected equilibrium loading as well as diffusional rates.It was found that at these low concentrations, the diffusional rates improves with a decrease in the external metal concentration. A comparative study involving the chelating and cation·exchange resins were performed, during which the resins were contacted with the metals in free fonn. It was found that at high metal concentrations, the chelating resin induced a rate limiting effect, but at trace concentrations, this effect is virtually negated. Whereas the cation exchange resin exhibited little selectivity in adsorbing the metals, it was found that the chelating resin prefers the metals in the eu > Ni > Zn. The chelating resin proved to be no less durable then the cation exchange resin, and both slightly lost their ability to adsorb the metal cations as a result of the effects of an inert coarse sand slurry.Tests performed with a real ore leachate, showed the cation exchange resin to be efficient at a low pH , but also relatively non selective, since the adsorption of copper from the leachate was greatly reduced due to the presence of other heavy metals.
Rozycki, Torsten von [Verfasser], D. H. [Akademischer Betreuer] Nies, G. J. [Akademischer Betreuer] Krauss y M. H. [Akademischer Betreuer] Saier. "Computational investigations of divalent heavy metal ion homeostasis / Torsten von Rozycki. Betreuer: D. H. Nies ; G. J. Krauss ; M. H. Saier". Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2009. http://d-nb.info/1024859924/34.
Texto completoOgunleye, Adetoro O. "Bacterial poly-gamma-glutamic acid (γ-PGA) : a promising biosorbent of heavy metals". Thesis, University of Wolverhampton, 2015. http://hdl.handle.net/2436/579925.
Texto completoMartí, Calatayud Manuel César. "STUDY OF THE TRANSPORT OF HEAVY METAL IONS THROUGH CATION-EXCHANGE MEMBRANES APPLIED TO THE TREATMENT OF INDUSTRIAL EFFLUENTS". Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/46004.
Texto completoMartí Calatayud, MC. (2014). STUDY OF THE TRANSPORT OF HEAVY METAL IONS THROUGH CATION-EXCHANGE MEMBRANES APPLIED TO THE TREATMENT OF INDUSTRIAL EFFLUENTS [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/46004
TESIS
Premiado
Huang, Jing. "Functional Polymers Containing Semi-Rigid Alternating Sequences". Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/89884.
Texto completoPHD
Quattrini, Federico. "Emerging Techniques for Inorganic Metal Speciation and Bioavailability". Doctoral thesis, Universitat de Lleida, 2018. http://hdl.handle.net/10803/664422.
Texto completoEl conocimiento profundo de la especiación de los metales pesados es clave para determinar su biodisponibilidad. Por eso es necesario complementar la información sobre las concentraciones con la información sobre los flujos de internalización. Diversas técnicas analíticas han sido desarrolladas con este fin, y varias aprovechan propiedades de las resinas de intercambio iónico o quelantes. Por un lado esta tesis investiga la velocidad de acumulación de iones metálicos en la resina Chelex 100, tanto experimentalmente, como a través de un modelo teórico. Esta interpretación permite, asimismo, describir los efectos de los ligandos competidores y determinar las constantes de disociación de los complejos. Por otro lado, dos nuevas técnicas analíticas han sido desarrolladas. La primera deriva de la IET, una técnica comúnmente utilizada en equilibrio, pero extrae información dinámica de ella. La segunda es una modificación del popular DGT, que se ha empleado una vez el sistema ha alcanzado el equilibrio.
A deep knowledge of heavy metal ions speciation is key to assessing their bioavailability. In this regard, data about concentrations should be complemented with data about the internalization fluxes. Several analytical techniques have been developed to this purpose, and many of them exploit properties of ion-exchange or chelating resins. On the one hand, this thesis studies the rate of metal ions uptake on Chelex 100 resin, both experimentally and through a theoretical model. This interpretation also allows describing the effect of competing ligands and determining the dissociation constants of the complexes. On the other hand, two new analytical techniques are developed. The first one stems from IET, a technique commonly used at equilibrium, but aims at extracting dynamic information from it. The second one is a modification of the well-known DGT, devised to provide information once equilibrium has been attained.
Diaz, Mendoza Alvaro. "Conception of a fibrous composite material for the retention of heavy metals". Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI125.
Texto completoHeavy metal contamination is a current problem which affects the ecosystems and their constituent organisms. This problem has been worldwide recognized as one of the biggest challenges of our time. Since the middle of the last century, innovations in the material science field have developed new methods to confront this risk, with techniques such as chemical precipitation or flotation. However, there is still significant room for improvement in this line. Furthermore, recent research has explored how to combine biomolecules such as proteins with materials like polymers to create more active solutions. This thesis work seeks to create a prototype hybrid biosorbent material capable to capture specifically the divalent metal ions Ni(II), Cd(II) and Pb(II) thanks to the presence of a synthetic metalloprotein in its structure. To address this objective, the thesis work focuses on the development of a synthetic metalloprotein capable to specifically capture the three target metal ions, from the in silico conception to its in vivo synthesis. On the other hand, the biosorbent material support is processed with the electrospinning technique that consists of a fibrous membrane material, being optimized to host the synthetic metalloprotein in its structure. Additionally, a method to integrate the metalloprotein into the polymeric support is researched. This is achieved by means of a grafting route through surface modified silica nanoparticles. At the end, the integration of both components creates the expected prototype synthetic biosorbent material. This material has been characterized to evaluate its capacity to adsorb the three metal ions of interest, providing some trends of the future perspectives for further development to create more efficient materials for the industry
Lappalainen, K. (Katja). "Modification of native and waste starch by depolymerization and cationization:utilization of modified starch in binding of heavy metal ions from an aqueous solution". Doctoral thesis, Oulun yliopisto, 2015. http://urn.fi/urn:isbn:9789526209661.
Texto completoTiivistelmä Tärkkelys on yksi yleisimmistä luonnossa esiintyvistä polysakkarideista. Sitä hyödynnetään useilla eri teollisuuden aloilla. Monimutkaisen rakenteensa vuoksi tärkkelys on liukenematon useimpiin orgaanisiin liuottimiin ja veteen, minkä vuoksi sitä täytyy modifioida ennen käyttöä. Tässä väitöstutkimuksessa tärkkelyksen modifioinnissa käytettiin ionisia nesteitä reaktioväliaineena. Tutkimuksen alussa eri tärkkelyslajeja depolymeroitiin 1-allyyli-3-metyyli-imidatsoliumkloridissa ([AMIM]Cl) katalyyttinä p-TsOH. Mikroaaltoaktivointia ja haudekuumennusta käytettiin vaihtoehtoisina lämmitysmenetelminä. Reaktion edistymistä ja tuotteiden muodostumista tutkittiin HPLC-ELSD -menetelmällä. Eri tärkkelyslajit depolymeroituivat samankaltaisesti vesiliukoisiksi, lyhytketjuisiksi tärkkelysoligomeereiksi. Mikroaaltoaktivointi lyhensi reaktioaikaa haudekuumennukseen verrattuna. Tutkimuksen seuraavassa vaiheessa tutkittiin ohratärkkelyksen liukoisuutta ja depolymeroitumista eri ionisissa nesteissä. Tulosten perusteella ionisen nesteen sekä anioni- että kationiosa vaikuttivat tärkkelyksen liukenemiseen. Depolymeroidun ohratärkkelyksen modifiointitutkimuksia jatkettiin [AMIM]Cl:ssa kationisoinnilla. Lämmitysmenetelmänä käytettiin mikroaaltoaktivointia. Tuotteet tutkittiin käyttäen alkuaineanalyysiä sekä HPLC-ELSD- että 1H NMR-tekniikoita. Kationisoitujen tuotteiden substituutioaste (DS) vaihteli reaktio-olosuhteista riippuen välillä 0.2–0.5. Saatuja tuotteita tutkittiin raskasmetalli-ionien sitomisessa vesiliuoksesta. Havaittiin, että kohtalaisesti substituoitu (DS 0.4) modifioitu tärkkelys sitoi Cu(II)-, Fe(III)- ja Zn(II)-ioneja vesiliuoksesta. Tutkimuksen loppuosassa tutkittiin perunan kuorijätettä vaihtoehtoisena tärkkelyslähteenä kationisoidun tärkkelyksen valmistamisessa. Kuorijäte esikäsiteltiin kuumentamalla se emäksisessä etanoliliuoksessa, minkä jälkeen sille suoritettiin kationisointi vesiliuoksessa. Kationisten tuotteiden substituutioasteet vaihtelivat välillä 0–0.35. Tuotteiden soveltuvuutta Cu(II)-ionien sitomiseen vesiliuoksesta tutkittiin ICP-OES -menetelmän avulla. Alustavien tulosten mukaan kationisoitu jätetärkkelys sitoi kupari-ioneja vedestä, kun tärkkelyksen ja kuparin moolisuhde oli 3:1
Hendricks, Nicolette Rebecca. "The application of high capacity ion exchange adsorbent material, synthesized from fly ash and acid mine drainage, for the removal of heavy and trace metal from secondary Co-disposal process waters". Thesis, University of the Western Cape, 2005. http://hdl.handle.net/11394/1455.
Texto completoMagister Scientiae - MSc
Olofsson, Emelie. "Lokal provtagning och analys på rökgaskondensat för driftövervakning av tungmetallrening med jonbytarmassor". Thesis, Uppsala universitet, Luft-, vatten- och landskapslära, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-414340.
Texto completoIn heating and combined heat and power plants, different types of fuels are burned to produce electricity and district heating. During the combustion flue gases containing pollutants, such as heavy metals, are formed from the flue. The plants have requirements for low emissions, both from the flue gases and the wastewater. The flue gases are purified by various techniques and a common technique is flue gas condensation. During the flue gas condensation, a liquid called flue gas condensate, is formed, which partly contains heavy metals from the flue. The flue gas condensate must be cleaned before it can leave the plant. A step in the purification of the flue gas condensate is usually heavy metal ion-exchanger. The ion-exchange mass in the heavy metal ion-exchange columns needs to be changed approximately twice per operating season as it no longer has room to bind more heavy metals. This is an expensive cost for the heating and combined heat and power plants that they want to minimize. This study investigated whether local sampling and analysis at a cogeneration plant of a number selected heavy metals in flue gas condensate is a good method for optimizing the purifications step with heavy metal ion-exchangers. And if this can ensure that the environmental requirements for the heavy metals in the purified flue gas condensate are met. Optimization means that the full capacity of the ion-exchange masses is utilized, i.e. that the exchange of ion-exchange masses can be reduced without risking unauthorized levels of heavy metals in the purified flue gas condensate as a result of the ion exchange masses being used for too long. The time needed for local sampling and analysis was also documented. At present, analyzes are done at accredited laboratories where it takes over two weeks to get the result and during that time much can be changes at the plant. A verification of the result of the study was also made against the result of an accredited laboratory. In this study, local analysis was made with the measuring instrument FREEDD which is based on quartz crystal microbalance (QCM-technology). Other options for local sampling and analysis have not been investigated. The result showed that, in the present, it is difficult to optimize the purification step with ion-exchange masses and check emissions of heavy metals with the purified flue gas condensate. To obtain reliable result, corrections to the measuring instrument and test points need to be made. The time that needs to be set aside for sampling and analysis depends on the metal, as the time for sample preparation varies. But if it can enable the plants to use the ion-exchange masses longer and gain control of the emissions of heavy metals with the purified flue gas condensate, it can be profitable to save that time.
Niehus, Christina. "Untersuchungen zur Selektivität unterschiedlich substituierter Iminodiessigsäure-Ionenaustauscher gegenüber zweiwertigen Metallionen". Phd thesis, Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2007/1319/.
Texto completoSelective ion exchange offers a good solution for cleaning many waste streams. The aim of this study was to develop selective ion exchange materials for effective and economical applications in waste water treatment. The investigation of chelate resins is based on iminodiacetate with different secondary substitution (degree of substitution TK/N 1 - 2, from aminoacetic acid to iminodiacetate as functional group). As comparison the weak acid resin Lewatit TP 207 was used. The research focused on the application of selective ion exchange resins for waste effluents to ascertain the feasibility of a selective ion exchange process employing chelating cation exchangers for heavy metal removal. The metals of interest were copper (Cu), zinc (Zn), nickel (Ni), cobalt (Co), lead (Pb) and cadmium (Cd) and the resins appointed in the Ca-form. The batch operation was conducted to determine the equilibrium data and the operating resin capacity, one of the most important properties. The main equilibrium parameter affecting the ion exchange was the pH value (array 2-5). The best accumulation pH value was obtained using pH 5 for all metals. The only exception was lead with pH 3. After determining the viability of the different resins with batch systems, this study has focused on the column mode experiments. They were generated for the selected resins in the continuous ion exchange process which are essentially reserved for industrial applications. A practical application of the breakthrough curves is the determination of the breakthrough time which helps to find the best operating conditions.
Bouillaud, Pascal. "Irradiation aux ions lourds de films minces nanocristallins d'alliages FeCo et FeAl". Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37612171v.
Texto completoKurdi, Mohamad. "Sur l'utilisation des sulfures en catalyse d'hydrotraitement le trisulfure du niobium /". Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376148133.
Texto completoTsai, Cheng-Kuo y 蔡正國. "A Study of Adsorption of Dissolved Heavy Metal Ions by Composite Carbon Nanotubes". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/92212031270465937465.
Texto completo國立雲林科技大學
環境與安全工程系碩士班
93
The Study of Adsorption of Heavy Metals from aqueous Solution by Composite Carbon Nanotubes Student: Cheng-Kuo Tsai Advisor: Dr. Jao-Jia Horng Institute of safety Health and Environmental Engineering National Yunlin University of Science and Technology ABSTRACT Carbon Nanotubes (CNTs) were grown on alumina oxide (α- Al2O3 ) after deposited Fe-Ni nanoparticles by chemical vapor deposition method to form CNT/Fe-Ni/ Al2O3 composite particles. Composite particles would be fabricated at low price, easy handling and had higher adsorption capacities of Pb+2, Cu+2 and Cd+2 than these of active carbon powders (PAC) and merchant CNTs. The composite CNTs were at sizes of micrometer length and with tube diameters of 80-100 nm. The sinking tests showed that merchant CNTs would aggregate fast while composite particles could disperse in solution to enhance mixing efficiency. The experimental results revealed that the composite particles were good adsorbent with capacities of Pb2+ 67.11 mg/g 、Cu2+ 26.59 mg/g、Cd2+ 8.89 mg/g, respectively. In this study the adsorption capacities of Pb+2, Cu+2 and Cd+2 were regressed by three adsorption models and Langmuir isotherm model showed good fit. The multi-layers adsorption (BET) was not accepted. The kinetic mechanism of adsorption by composite particles was found to be second order. The adsorption efficiency of 40 mg/l Pb2+、Cu2+ could reach 80% at 0.2 g dosage. The affinity order of competitive adsorption of three metal ions onto active carbon powders, merchant CNTs and composite particles were the same of Pb+2> Cu+2> Cd+2. The recovery of composite particles could still reach 90 % by 0.5 N nitrite even after six adsorption/regenerate cycles.
Lee, I.-Hsien y 李逸先. "Multi-component Heavy Metal Ion Exchange Process". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/29894495331980365060.
Texto completo大同大學
化學工程研究所
90
Due to limited water resources, how to treat and reuse industrial wastewater has become a very important task to environmental protection. Ion-exchange process can not only remove heavy metals from wastewater efficiently but also recover them easily without generating the secondary pollution problems caused by heavy metal sludge. This study, based on the non-linear wave propagation theory, carries a series of batch and column experiments to predict the dynamics at different feed compositions. The batch experiments are performed to obtain the binary copper-hydrogen, zinc-hydrogen, and cadmium-hydrogen ion-exchange equilibria, expressed in terms of the separation factor and selectivity coefficient, at different total mobile-phase concentrations. The column experiments are conducted to measure the breakthrough and regeneration curves, effluent solution pH and conductivity of the binary, tertiary and four-component systems at various feed compositions. The predicted column dynamics of this study does not match the experimental results perfectly, but the trends are consistent.
Lee, I.-Hsien y 李逸先. "HEAVY METAL SLUDGE TREATMENT BY ACID LEACHING AND ION EXCHANGE". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/pehh5n.
Texto completo大同大學
化學工程學系(所)
95
A huge quantity of sludge containing heavy metals was and is being generated from wastewater treatment processes in order to treat the industrial wastewaters in Taiwan. Heavy metal sludge is classified as hazardous solid waste and cannot be disposed off because of its toxicity. This study aims at developing a combined acid extraction and ion-exchange process by using ion exchange resin to facilitate remove heavy metals such as copper, zinc, cadmium, chromium, nickel and iron from the sludge generated by a PCB manufacturing plant in Taiwan. Factorial experimental design methodology was first used to study the feasibility of using the combined acid extraction and ion exchange process. The statistical analysis shows that leaching acid and reaction temperature plays an important role in the sludge extraction or metal recovery. The individual extraction kinetic results showed that the metal extraction rates increased with the acid concentration, temperature, but decreased with increasing particle size. Nitric acid was found to be more effective than citric acid to extract the heavy metals from the sludge. The ion-exchange equilibrium data were analyzed by the Langmuir isotherm, Freundlich isotherm, and thermodynamic equilibrium constant approaches. The Langmuir isotherm fits the ion-exchange equilibrium data better than the Freundlich approach. But for ions with different valences such as heavy metal and hydrogen ions the ion-exchange equilibrium was better described by the mass action law using thermodynamic equilibrium constant. The reversible reaction model was capable to predict the effects of resin to solution ratio, initial heavy metal concentration, and temperature on the ion-exchange kinetic curves. The ion-exchange column results showed that the total cation concentration in the mobile-phase played a key role on the breakthrough curves; a higher feed concentration resulted in an earlier breakthrough. The self-sharpening wave model assuming local ion-exchange equilibrium could provide a simple and quick estimation for the breakthrough volume, but the predicted breakthrough curves did not match the experimental data very well. On the contrary, the constant-pattern wave model using a constant driving force model for finite ion-exchange rate provided a better fit to the experimental data. The obtained liquid-phase mass transfer coefficient was correlated to the flow velocity and other operating parameters; the breakthrough curves under varying operating conditions could thus be predicted by the constant-pattern wave model using the correlation. Experiments carried out in a re-circulation system including a leaching reactor and an ion-exchange column supported the concept of enhanced heavy metal leaching from the sludge and heavy metal recovery by the ion exchange resin. A mathematical model for batch heavy metal extraction in the presence of ion-exchange resin was established for the purpose of process design for sludge treatment.
Chang, Fang-Ching y 張芳菁. "SEPARATION AND RECOVERY OF HEAVY METAL BY ION EXCHANGE PROCESS". Thesis, 1996. http://ndltd.ncl.edu.tw/handle/97637853110278378272.
Texto completo大同工學院
化學工程學系
84
Due to limited water resources and increasing water demands of various kinds, especially of industries, how to treat and reuse industrial wastewatershas become not only a very important problem to environmental protection but also a crucial issue to industries seeking sustainable development. Wastewatercontaining heavy metals is one of the most difficult industrial wastewaters totreat. Although the conventional chemical precipitation method, which is the most popular one, is quite effective in removing heavy metals from wastewatersdeal with and usually causes a secondary pollution problem. On the contrary, ion exchange process are also very efficient but generate much less sludge. Moreover, different heavy metals could be separated and recovered and ideal state of the so-called zero discharge could be achieved via adequate ion exchange resin selection, process design, and column operation. In order to operate ion exchange columns adequately, the column dynamics which is governed by a set of coupled partial differential equations and associated equilibrium algebraic equations must be understood. Instead of solving the tedious equations, this research project modify the traditional wave propagation theory to predict the breakthrough and regeneration curves under various operating conditions. Batch experimental tests were conducted to obtain the exchange equilibria of H/Cu and H/Ni systems, and column tests were conducted to obtain the breakthrough and regeneration curves under various operating conditions. The experimental results showed that the wave theory indeed predicts the column dynamics well. Operating strategy for Cu and Ni separation by ion exchange was proposed based on this research project.
Chen, Chun-Hsing y 陳俊興. "EFFECTS OF COMPLEXATION REACTIONS ON HEAVY METAL ION EXCHANGE PROCESSES". Thesis, 1997. http://ndltd.ncl.edu.tw/handle/13029823721451937861.
Texto completoCiou, Shin Fan y 邱仕帆. "Development of Nanofibrous Chitosan Membranes for Heavy Metal Ion Removal". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/00228137319529150746.
Texto completo長庚大學
機械工程學系
101
We developed biodegradable nanofibrous polylactide/chitosan membranes for the removal of heavy metal ions. Polylactide and chitosan were first separately dissolved intrifluoroacetic acid (TFA). The solutions were then mixed and electrospun into nanofibrous membranes via an electrospinning process. The morphology of as-spun nanofibers was examined by scanning electron microscopy. The average diameter of electrospun nanofibers ranged from 410 nm to 710 nm. The adsorption capability of nanofibrous polylactide/chitosan membranes was measured and compared with that of bulk chitosan. The influence of various process conditions on adsorption efficiency was also examined. The experimental results suggested that the electrospun nanofibrous polylactide/chitosan membranes exhibit good silver ion uptake capabilities. The metal uptake of nanofibrous membranes increased with the initial metal ion concentrations and decreased with the filtering rate of the solutions. Furthermore, the electrospun membrane could be reused after the recovery process. The empirical results in this study suggested that electrospun nanofibrous polylactide/chitosan membranes can be a good candidate for the removal of heavy metal ions.
Tseng, PoWei y 曾柏維. "Ion Exchange of Heavy Metal Ion with Glycidyl Methacrylate Copolymer Containing Dithiocarbamate Chelating Group". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/88166578094091855946.
Texto completo淡江大學
化學學系
91
A dithiocarbamate group containing compound is introduced into glycidyl methacrylate copolymer and the resulting copolymer serves as a metallic ion chelating functional polymer. Amino-terminated and dithiocarbamate group containing compounds are obtained from the reaction of carbon disulfide with p-phenylenediamine and ethylenediamine in an alkali solution, respectively. Amino group of these dithiocarbamate compounds react with the epoxide group of glycidyl methacrylate copolymer and dithiocarbamate becoming a pendent of these copolymers. The ion exchange of lead and cupric ions with these dithiocarbamate containing polymers under different pH values are investigated. The identification of dithiocarbamate group containing compounds are carried by FT-IR and FT-NMR; the metallic ion exchange capacity of a known solution before and after these chelating processes by these polymers are measured by atomic absorption spectra; The thermal stability of these copolymers before and after metallic ion exchange are evaluated by thermogravimetric analyzer.
Sukesan, Revathi y 梅. 莉. "Rapid Heavy Metal Ion Screening using Extended Gate Ion Selective Field Effect Transistor Sensor". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/74ry67.
Texto completo國立清華大學
奈米工程與微系統研究所
106
Heavy metals are a risk to humans if they get accumulated in your body. Mercury is an extremely dangerous one, if inhaled it directly targets the brain, whereas mercuric salts mainly affects the kidney. Monitoring concentration of mercury in drinking water, tap water and juices or food we intake are thus really important. There are several techniques in place in order to check the concentration of mercury but most of them are either laboratory based and expensive, some are inconvenient as well. Since there is an increasing case of mercury related poisoning it becomes necessary to monitor the mercury level. The extended gate ISMFET sensor enables easy and economical testing and provides a reliable output on the amount of mercury in that particular test material in a really short period of time. This sensor deciphers a sensing methodology which is highly selective to the target ion and offers a low affinity to other interfering ions. By combining ion-selective membrane with an extended gate device connected to a FET, and introducing the electric double layer structure with an extremely small gap distance enables us to attain sensitivity higher than the Nernst behaviour, and also improves the detection limit to 10-13 M which is much better than the benchtop instruments. We have also achieved a dynamic range from 10-13 M to 10-5 M. the sensor can also be used for real time testing in different water based systems such as tap water, drinking water, industrial waste water, medicines, food and beverages. Along with the advantages of small size, portable, less expensive and easy to fabricate this can be coined as a reliable and user friendly mercury sensor.
Kney, Arthur D. "Synthesis and characterization of a new heavy-metal-selective inorganic ion exchanger /". Diss., 1999. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:9935165.
Texto completoFang, Yun-Lung y 方雲龍. "Amino acid-base hydrogel: A heavy metal ion scavenger in blood". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/m24drj.
Texto completo國立中央大學
生醫科學與工程學系
106
Heavy metal pollution has been one of the most important environmental problems today. Copper-containing wastewater is extensively released from different industries. The release of metal ions into food chains results in serious healthcare issues such as overaccumulation in human body leading to Alzheimer's, Parkinson's and Wilson diseases. Pharmaceutical chelating agents are widely used in the treatment of copper-induced toxicity. However, it had been reported that the side effects of the treatment damage the immune system, kidneys and neurological symptoms of patients with pre-existing neurological problems. Zwitterionic amino acid-based polymers were developed for excellent biocompatibility and antifouling properties. In previous studies, amino acid group enables specifically catching copper ions from solution by formation of a chelating structure. Here, we developed an amino acid-based hydrogel adsorbent in order to rapid and effective removal of Cu2+ ions from blood by filtration in a gel-packed column. We performed the chelating ability of gel adsorbent to Cu2 + under different conditions and confirmed the hemocompatibility by hemolysis test and platelet adhesion test. Finally, we verified the capability of gel column to remove copper ions from the solution in an animal experiment. As result, it owns good adsorption and regeneration ability, and good hemocompatibility and it also can sorption copper in blood. We expect that the amino acid-based hydrogels hold a great potential as a Cu2+-removal hemodialysis system in the future.
Yang, Cheng-Yu y 楊政育. "Adsorption of Heavy Metal Ions ( Cu, Zn, Ni, Pb, ) by crosslinked metal ion-templated chitosan". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/56640797127369507350.
Texto completo國立高雄師範大學
化學系
94
Chitosan is capable of adsorbing metal ions due to its amine and hydroxy groups, but chitosan is soluble in organic acids and inorganic acids. Crosslinking is used to improve the acid-resisting of chitosan. Moreover, crosslinking will lower the adsorbability of chitosan. In this research, we made the crosslinked metal ion-templated chitosan with two crosslinker of Glutaraldehyde, Epichlorohydrin and four metal ion of Cu2+、Zn2+、Ni2+、 Pb2+, and observe the situation of adsorbing heavy metal ions such as Cu2+、Zn2+、Ni2+and Pb2+ ions with it. In this research, (1) the GLA-crosslinked metal ion-templated chitosan : The adsorption capacity of Cu2+ is 35.51 mg/g for Cu(II)-templated chitosan and increase 54.8% compared with the non-templated chitosan. The adsorption capacity of Zn2+ is 15.97 mg/g for Zn(II)-templated chitosan and increase 42.08% compared with the non-templated chitosan. The adsorption capacity of Ni2+ is 65.38 mg/g for Ni(II)-templated chitosan and increase 428.17% compared with the non-templated chitosan; The adsorption capacity of Pb2+ is 100.12 mg/g for Pb(II)-templated chitosan and increase 42.09% compared with the non-templated chitosan. (2)the ECH-crosslinked metal ion-tempalted chitosan: The adsorption capacity of Cu2+ is 26.97 mg/g for Cu(II)-templated chitosan and increase 198.34% compared with the non- templated chitosan. The adsorption capacity of Zn2+ is 14.59 mg/g for Zn(II)-templated chitosan and increase 46.34% compared with the non- templated chitosan. The adsorption capacity of Ni2+ is 17.05 mg/g for Ni(II)- templated chitosan and increase144.62% compared with the non- templated chitosan. The adsorption capacity of Pb2+ is 61.49 mg/g for Pb(II)-templated chitosan and increase 17.66% compared with the non- templated chitosan. We found that the crosslinked metal ion-templated chitosan has higher adsorbtion capacity and selectivity than the crosslinked non-templated chitosan and that the GLA-crosslinked metal ion-templated chitosan has higher adsorption capacity than ECH- crosslinked metal ion-templated chitosa
Lai, Jian Ren y 賴建任. "Porous Silicon Based Photonic-Sensor for High Sensitive Heavy Metal Ion Detecrtion". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/put9b8.
Texto completo國立清華大學
工程與系統科學系
103
Water is essential to human life material, settlement of people's lives as much dependent on the water area and growth. Human society continues to progress from the first agricultural society through the industrial revolution until now, people with the growth of industry and technology have had a relatively affluent life than ever before. But in the booming industry it has been accompanied by a number of environmental pollution produced, such as carbon dioxide cause global warming caused by industrial waste water in various forms of water pollution and so on. This will gradually hurting the environment we live. The heavy metal pollution in water pollution in 70 to 80 years is relevant agricultural, fishery and animal husbandry against Taiwan, such as arsenic, cadmium, mercury, lead and heavy metal pollution. In view of this, the aim of this study is related to the manufacture of heavy metals in water pollution detection mechanism. The current detection mechanism mostly use the more expensive equipment or the use of complex chemical titration step approach to the analysis of heavy metals in aqueous solution. In this experiment, the first generation of wafer-dimensional photonic crystal having a characteristic and by a simple chemical synthesis and surface modification of it in Fourier infrared spectroscopy (FTIR) for detecting signals of heavy metals, and to achieve qualitative and quantitative results. The second generation of photonic crystal wafer as visible light with a wavelength of electrochemical reduction of metal ions to be measured directly in the porous silicon precipitates hole caused large refractive index change, to enhance the signal strength and the detection limit of the effect. The first two chapters illustrate the application of this study motive and related experiments. Today introduced the relevant heavy metal detection equipment, introduces the basic principles of photonic crystals with porous silicon etching works. The third and fourth chapters compared with experimental design processes and related process steps. Fifth and sixth chapters, compared with results of the discussions and conclusions. Literature review is included in Chapter VII.
Wu, Ming Tsung y 吳明宗. "Amino-grafted β-chitosan and its application on heavy metal ion adsorption". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/98585110763612174580.
Texto completo萬能科技大學
材料科技研究所
99
Industrial effluent containing any heavy metals will cause seriously environmental pollutions and damages. Any attempts on removal of metal ions for contaminated water prior to discharging will win universal acceptance. Chitosan has a number of commercial and possible biomedical uses owing to its biocompatible, biodegradable and renewable properties, and was found to be one of excellent candidates for metal ion adsorbents. In order to enhance its adsorbing capability, β-chitosan was used as a precursor for further modification, by which the amino group on C2 of the chitosan can react with benzaldehyde under protection and thereby generates a Schiff base in the reaction system. It allows epichlorohydrin and triethylenetetramine to react with chitosan by means of grafting polymerization, and eventually, a crosslinked structure was formed. The structural changes, properties, and adsorbing capabilities of modified chitosans among these reaction sequences were systematically analyzed using FTIR, UV-VIS, XRD, EA, NMR, TGA, DSC, BET and SEM measurements. For the reaction of Schiff base formation, an ultimate reaction condition was obtained by using the orthogonal optimal method. It indicated that a feed composition containing chitosan of 1 g and benzaldehyde of 5ml can get optimal effect as performed a reaction under pH 7 at a reaction temperature of 60 oC for 3 h. It was found from the result that the capacity of modified chitosan for copper ion adsorption can be greatly promoted at pH 2 ~ pH 6, i.e., increased from 67.76mg/g to 117.60mg/g at a pH of 6. In addition to, the adsorptions on silver ions are higher than those of copper ions as compared under the same pH value, for instance, the silver adsorption at pH 6 is 151.20mg/g, and the copper adsorption 117.60mg/g. An important point to emphasize is the fact that the modified chitosan becomes more acid resistant as compare with the pristine one.
Lee, Cheng-Hsun y 李政萱. "Monitoring Heavy Metal Ions in Water by Using Ion Exchange Resin Packs". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/72047911269205041813.
Texto completo國立臺灣大學
生物環境系統工程學研究所
104
Unlawful manufacturers have often discharged their wastes secretly and caused severe damages to our environment. These kind of polluting events are usually done unpredictably in a short time without any sign, but the discharges could be highly concentrated and the locations are quite uncertain and dispersed. The goal of this study is to develop the ion exchange resin pack as an environmental fingerprinting method, which will enable the regulatory agencies to monitor and identify illegal polluters, in order to assure irrigation water and soil quality. In this study, inexpensive ion exchange resin packs are developed and deployed for a given period of time in the areas being monitored. After the packs are recovered, we can then determine the amount of heavy metal in ion exchange resin packs and identify the distribution of the hidden pollution sources. This study was divided into two parts, the laboratory experiments and the field testing respectively. The results of the laboratory experiments show that approximately 40% of the heavy metal ions were absorbed onto cation exchange resin from aqueous solution in 30 minutes. There were no significant differences in the percentage being absorbed at various concentrations tested as long as the resins did not reach exhaustion in the range we tested. In the field experiment, we chose Changhua as a study area. There were 151 point sites in two canals and each site was placed three packs for monitoring time for 7, 14, and 21 days. Metal ions in the recovered packs were determined with an Itrax X-Ray fluorescence mass spectroscopy. The principal component analysis (PCA) method was used to analyze the data which indicated that there were 4 principal components, the natural background (PC1), the background of the monitored area characteristics (PC2), the metal treatment and the electroplating industry (PC3 and PC4). It is expected that these results will provide a good foundation for further research and applications of this monitoring method.
Grosse, Andrew Clifton. "The synthesis of adsorbents for metal ions in soils and ores". Thesis, 1998. https://eprints.utas.edu.au/19688/1/whole_GrosseAndrewClifton1998_thesis.pdf.
Texto completoYang, Te-Chien y 楊得謙. "Application of bacterial heavy metal ion binding proteins for silver resistance and adsorption". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/18326510462067964364.
Texto completo國立中興大學
生命科學院碩士在職專班
97
Heavy metal pollution has posed one of the serious threat to human health, therefore, seeks an economy and effective method to clear the heavy metal pollution is the urgent matter.Bioremediation is the best method can clear heavy metal pollution completely and will not cause the second pollution. Because the bacterial heavy metal binding proteins can absorb the heavy metal ions, therefore we can use the biological characteristics to eliminate the heavy metal pollution in the soil or water. Take the SilE protein as the example, the SilE protein has played the key role in the resistant mechanism of silver resistant bacterium, therefore, the Ag+ adsorptive capacity of SilE protein will be closely linked to its silver resistance. Six strains were included in this project. E.coli strain J53 contains plasmid pMG101 which have silver resistance. There are nine open reading frames of the silver resistance determinant in the plasmid, including SilE protein. Two recombinant plasmids were constructed by cloning silE gene with or without signal sequence into pET21b vector, resulting SilE-SP and SilE-NSP respectively. For MerP protein, another two constructs were made by cloning MerP with signal sequence or B95P without signal sequence into pET21b vector. All recombinant plasmids were transformed to E.coli BL21 (DE3) strain. One control is with backbone pET21b in E.coli BL21 (DE3). Resistance tests in agar plate and in liquid medium were performed to detect the strength of resistance to Ag+. In disc assay, the strength was pMG101>SilE-SP>MerP>pET21b>SilE-NSP>B95P and pMG101>MerP>SilE-SP>pET21b>SilE-NSP>B95P for resistance test in liquid medium. Because both SilE and MerP protein can absorb heavy metal ions, adsobability experiment was also done to detect the Ag+ residue in the buffer. The results were 1.89 ± 0.026 mg/l for pMG101,1.92 ± 0.031 mg/l for MerP,1.93 ± 0.006 mg/l for pET21b,1.94 ± 0.021 mg/l for SilE-SP,1.94 ± 0.020 mg/l for SilE-NSP,and 2.10 ± 0.026 mg/l for B95P. In brief, the adsorbability to adsorb Ag+ is pMG101>MerP>pET21b>SilE-SP≒SilE-NSP>B95P. The results above showed that MerP protein can absorb Ag+ and the efficiency is only less than pMG101(J53), therefore, the next experiment was to observe the growth and detect the amount of the Ag+ can be absorbed by the transgenic plant containing merP gene (P5 transgenic plant). The host of bacterial merP gene is Arabidopsis. Furthermore, because MerP protein can absorb Hg+2, Ag+ and other heavy metals, the character of adsorption to heavy metal ions needs to be further investigated for the P5 transgenic plant. We found the differences for silver adsorption of P5 transgenic plant embedding in MS medium containing between Ag+ only and both Hg+2 and Ag+.The results indicated that the plant can absorb more Ag+ in the condition containing both Hg+2 and Ag+.
蔡承延. "Design of A Heavy Metal Ion Sensor Based on Brush-distributed Nanofiber Technology". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/82489483038939873926.
Texto completoLi, Chia-Lin y 李佳霖. "Synthesis of Fluorescent Chemosensors and the Studies of Heavy Metal Ion-Sensing Properties". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/bjpva6.
Texto completo國立彰化師範大學
化學系
106
Abstract We successful design and synthesized five fluorescent chemosensors and further explore their recognition ability toward metal ions. From the results, chemosensors 1 and 2 can selectivity recognize Hg2+ ions and Pb2+ ions among a series of metal ions, respectively. They show obvious fluorescence quenching and fluorescence enhancement, respectively. Interesting, chemosensors 3, 4 and 5 all can selectivity recognize Al3+ ions by different color change under U.V lamp detection. And all of them show obvious fluorescence enhancement. In addition, chemosensors 1, 4 and 5 were also applied in the fluorescent indicator paper. Keyword:Chemosensor、Fluorescent probe
"Enhancement of metal ion removal capacity of water hyacinth". 2001. http://library.cuhk.edu.hk/record=b5890617.
Texto completoThesis (M.Phil.)--Chinese University of Hong Kong, 2001.
Includes bibliographical references (leaves 83-103).
Abstracts in English and Chinese.
Acknowledgements --- p.i
Abstract --- p.ii
Table of Contents --- p.iv
List of Figures --- p.viii
List of Tables --- p.ix
Chapter 1. --- Literature Review --- p.1
Chapter 1.1 --- Introduction --- p.1
Chapter 1.2 --- Overview of metal ions pollution --- p.2
Chapter 1.3 --- Treatment of metal ions in wastewater --- p.4
Chapter 1.3.1 --- Conventional methods --- p.4
Chapter 1.3.2 --- Microbial methods --- p.5
Chapter 1.4 --- Phytoremediation --- p.6
Chapter 1.4.1 --- Rhizofiltration --- p.10
Chapter 1.4.2 --- Mechanisms of metal ion removal by plant root --- p.12
Chapter 1.5 --- Using water hyacinth for wastewater treatment --- p.15
Chapter 1.5.1 --- Biology of water hyacinth --- p.15
Chapter 1.5.2 --- Water hyacinth based systems for wastewater treatment --- p.21
Chapter 1.6 --- Biology of rhizosphere --- p.23
Chapter 2. --- Objectives --- p.26
Chapter 3 --- Materials and Methods --- p.28
Chapter 3.1 --- Metal ion stock solution --- p.28
Chapter 3.2 --- Plant material and growth conditions --- p.28
Chapter 3.2.1 --- Preparation of Hoagland solution --- p.28
Chapter 3.3 --- Metal ion resistance of water hyacinth --- p.31
Chapter 3.4 --- Effect of metal ion concentration on the bacteria population --- p.31
Chapter 3.4.1 --- Minimal medium (MM) --- p.31
Chapter 3.5 --- Isolation of rhizospheric metal ion-resistant bacteria --- p.34
Chapter 3.6 --- Metal ion removal capacity of isolated bacteria --- p.34
Chapter 3.7 --- Colonization efficiency of a metal ion-adsorbing bacterium onto the root --- p.35
Chapter 3.7.1 --- Suppression of the bacterial population in the rhizosphere by an antibiotic --- p.35
Chapter 3.7.2 --- Colonization efficiency --- p.36
Chapter 3.8 --- Effect of colonizing the metal ion-adsorbing bacteria on the metal ion removal capacity of roots --- p.37
Chapter 4. --- Results --- p.38
Chapter 4.1 --- Selection of optimum metal ion concentration for water hyacinth and rhizo spheric bacteria --- p.38
Chapter 4.1.1 --- Metal ion resistance of water hyacinth --- p.38
Chapter 4.1.2 --- Effect of metal ion concentration on population of rhizospheric bacteria --- p.43
Chapter 4.1.3 --- Selection for optimum metal ion concentration for water hyacinth and rhizospheric bacteria --- p.43
Chapter 4.2 --- Screening for bacterial strain with high metal ion resistance and removal capacity --- p.46
Chapter 4.2.1 --- Enrichment of the metal ion-resistant bacteria in the rhizosphere --- p.46
Chapter 4.2.2 --- Isolation of the natural bacterial population in rhizosphere --- p.50
Chapter 4.2.3 --- Determination of the metal ion removal capacity of rhizospheric metal ion-resistant bacterial strains --- p.52
Chapter 4.2.4 --- "Comparison of Cu2+, Ni2+ and Zn2+ removal capacities of Cu2+-resistant bacterial strains" --- p.53
Chapter 4.3 --- Effect of inoculating Cu2+-resistant bacterial strain to the rhizosphere on the metal ion removal capacity of the root --- p.59
Chapter 4.3.1 --- Bactericidal efficiency of oxytetracycline --- p.59
Chapter 4.3.2 --- Effect of inoculating Cu2+-adsorbing bacterial cells into the rhizosphere --- p.62
Chapter 4.3.3 --- Effect of bacterial cell density of inoculum on colonizing efficiency --- p.63
Chapter 4.3.4 --- Colonizing efficiency and metal ion removal capacity of root by direct inoculation of metal ion-adsorbing bacterial cells into metal ion solution or pre-inoculation in Hoagland solution --- p.64
Chapter 4.3.5 --- Effect of inoculating Strain FC-2-2 into the rhizosphere on the removal capacity of roots --- p.64
Chapter 5. --- Discussion --- p.69
Chapter 5.1 --- Selection of optimum metal ion concentration for water hyacinth and rhizospheric bacteria --- p.69
Chapter 5.1.1 --- Metal resistance of water hyacinth --- p.69
Chapter 5.1.2 --- Effect of metal ion concentration on population of rhizospheric bacteria population --- p.70
Chapter 5.1.3 --- Selection for optimum concentration --- p.70
Chapter 5.2 --- Screening for high metal ion-resistant and -removal bacterial strains --- p.71
Chapter 5.2.1 --- Enrichment of the metal ion-resistant bacteria in the rhizosphere --- p.71
Chapter 5.2.2 --- Select metal ion-resistant bacterial strain from the natural population in the rhizosphere --- p.72
Chapter 5.2.3 --- Determination of the metal ion removal capacity of respective metal ion-resistant bacterial strain --- p.72
Chapter 5.3 --- Effect of inoculating Cu2+-resistant bacterial strain in the rhizosphere on the metal ion removal capacity of the root --- p.74
Chapter 5.3.1 --- Bactericidal efficiency of oxytetracycline --- p.74
Chapter 5.3.2 --- Effect of inoculating Cu2十-adsorbing bacterial cells into the rhizosphere --- p.75
Chapter 5.3.3 --- Effect inoculum cell density on the colonizing efficiency --- p.76
Chapter 5.3.4 --- Comparison of colonizing efficiency and metal ion removal capacity of root by direct inoculation metal ion-adsorbing bacterial cells into metal solution or pre-inoculationin Hoagland solution --- p.77
Chapter 5.3.5 --- Effect of inoculating strain FC-2-2 into the rhizosphere on the removal capacity of roots --- p.78
Chapter 5.4 --- Limitation and future development --- p.79
Chapter 6. --- Conclusion --- p.81
Chapter 7. --- References --- p.83
Cheng, Chi-Wei y 鄭基偉. "The feasibility of recycling sulfuric acid containing heavy metal with ion exchange membrane process". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/95164896007215293088.
Texto completo國立高雄第一科技大學
環境與安全衛生工程研究所
101
Waste lead acid batteries in the battery case and the waste scrap lead to high-valued recycling, waste lead-acid battery recycling industry, for recycling, resource recycling, mainly recycling of lead metal and plastic casing waste lead acid batteries, the comcentration of sulfuric acid is lower, it’s not applicable to ordinary technology of recovery, so far it’s not to be considered and the recycling and reuse of resources; generally lead battery scrap recycling industry waste sulfuric acid process, the main practice is to waste sulfuric acid solution is added to neutralize alkaline chemical reaction and then transferred to water treatment plant in industrial zone. According to the reference , it indicate that foreign recyclers have developed several kinds of recyclable waste sulfuric acid lead battery fluid produced by the technology, so the study will be conducted the evaluation of these technologies, and try to estimate its cost. From waste sulfuric acid recovery techniques in the literature were screened out of eight kinds of recovery methods, such as ion exchange resins, diffusion dialysis, electrical dialysis and sodium recovery method, by sampling survey of waste sulfuric acid solution to the current situation and considering Taiwan recyclers the scale, preliminary assessment of diffusion dialysis method for the possible use of recycling technologies. Technical processing using the diffusion dialysis solution containing heavy metal waste sulfuric acid with the principles of the waste sulfuric acid solution of sulfuric acid as a solute, the use of waste sulfuric acid solution with heavy metal salts chargeability between differently to ion diffusion film itself has through sexual selection, acid and metal salts such separation and recovery of sulfuric acid. Affect diffusion dialysis recovery and removal of heavy metals are three main factors, (one) into the flow of traffic (two) into the flow and recycling of waste sulfuric acid solution of sulfuric acid liquid flow ratio (three) waste sulfuric acid solution of sulfuric acid concentration; in a variety of different operating conditions, to get into the flow when the flow of waste acid 10 mL / min and the feed stream and recycling of waste sulfuric acid solution of the flow rate ratio of 1:1.1 obtained when the best operating results, sulfuric acid recovery may more than 90%, lead and iron removal efficiency was 80% or more. In the waste sulfuric acid status survey results show that the detection of the recycling industry concentration of sulfuric acid and various metal concentration in iron concentration in the highest, followed by lead, in the original waste lead acid batteries of the sulfuric acid solution of iron concentrations are not particularly high, but after the dismantling of waste sulfuric acid solution, the concentration of iron obviously higher than other metal elements, presumably used in the process of dismantling dismantling machine mainly composed of iron and steel, disassembled waste lead acid batteries out of the waste sulfuric acid solution in contact with the dismantling of mechanical components, and thus after the dismantling of waste sulfuric acid solution measured higher iron concentrations, the concentrations of other metals were higher than in the original concentration of waste lead acid batteries. In this study, at the final stage, to two recycling plants take practical waste sulfuric acid solution, the use of waste taken back diffusion of acid in the laboratory assessment of the feasibility of the dialysis membrane. Experimental results show that the recovery of each batch of sulfuric acid concentration can reach more than 90%, and synthetic waste sulfuric acid solution similar to the experimental results, but the removal of lead and iron is about 20-40%, much lower than the synthetic waste the experimental results of sulfuric acid (which can be higher than 75%), presumably for the actual waste sulfuric acid solution has a high cation concentration and containing organic compounds (such as grease, etc.) which affect the diffusion of metal ions in the membrane selectivity. Above results, the use of ion diffusion membrane separation and recovery of waste lead acid storage battery has a considerable feasible, but further improve diffusion of the metal ion selective membrane to remove the metal ion recovery of sulfuric acid.
Wu, Yi-lin y 吳易霖. "The study of heavy metal ion removal by citric acid modified cellulose filter paper". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/a7rc97.
Texto completo國立清華大學
生醫工程與環境科學系
105
Membrane filtration is a promising water treatment technique, but its high energy consumption hinders its universal application. We herein introduce a low energy consumption filtration system, in which the cobalt rejection rate is greatly enhanced through Donnan exclusion from 10% to 95%. This is achieved by grafting citric acid onto the cellulose filter paper through esterification. The incorporated acid sites exhibits high cobalt affinity which enhances the Donnan exclusion effect. Most importantly, the filtration was conducted at atmospheric pressure yet still achieving permeate flux of 100 L/m2h. In conclusion, we demonstrate a new low energy consumption filtration system with high cobalt rejection through Donnan exclusion effect, which may have promising potential in various heavy metal contaminated waters.