Добірка наукової літератури з теми "Suspension adsorbents"
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Статті в журналах з теми "Suspension adsorbents"
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Xue, Mei, Ting Ting Liu, and Fei Cao. "Preparation of Mn-Fe Binary Oxide for Arsenic Removal from Aqueous Solution." Advanced Materials Research 800 (September 2013): 597–600. http://dx.doi.org/10.4028/www.scientific.net/amr.800.597.
Повний текст джерелаАнотація:
Adsorption removal of arsenic from contaminated drinking water was carried out by using Mn-Fe binary oxide adsorbent. Main phase of adsorbents was influenced by pH value of solution, and pH of 10 is the suitable synthesis condition to achieve the Mn-Fe binary oxide suspension adsorbents. Adsorbents with Mn/Fe mole ratio from 6/4 to 2/8 exhibits higher arsenite removal larger than 99.6%.
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Nuryono, Nuryono, Ali Agus, Sri Wedhastri, Y. M. S. Maryudhani, Deni Pranowo, Yunianto Yunianto, and Ebrahim Razzazi-Fazeli. "ADSORPTION OF AFLATOXIN B1 IN CORN ON NATURAL ZEOLITE AND BENTONITE." Indonesian Journal of Chemistry 12, no. 3 (December 28, 2012): 279–86. http://dx.doi.org/10.22146/ijc.21343.
Повний текст джерелаАнотація:
A study on adsorption of AFB1 in corn (kernel and grained) on natural zeolite and bentonite has been investigated. The first work was adsorption in a batch system of standard AFB1 solution on adsorbents. Some factors such as contact time, concentration of AFB1 and particle size of adsorbent were evaluated. The amount of AFB1 adsorbed was calculated based on the difference of AFB1 concentration before and after adsorption determined by high performance liquid chromatography (HPLC) method. Adsorption of AFB1 in corn sample was emphasized by mixing aqueous suspension of sample with adsorbent. Concentration of AFB1 in suspension was analyzed by enzyme-linked immuno-sorbent assay (ELISA) method. Result shows that adsorption of AFB1 on adsorbents of natural zeolite and bentonite is very fast. Within 15 min 99% of AFB1 (200 ng/mL) has been adsorbed by 25 mg of bentonite and 96% by zeolite. The particle size higher than 200 mesh did not give significant effect on the AFB1 adsorption capability. Effectiveness of zeolite in adsorbing AFB1 is lower than that of bentonite. Capability in reducing AFB1 contamination in corn samples (kernel and meal) for both adsorbents is lower than that in standard solution.
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Zhou, Qing, Man Cheng Zhang, Zhe Qin Li, and Ai Min Li. "New Hypercrosslinked Polymer Adsorbents for Solid Phase Extraction of Polar Compounds." Advanced Materials Research 239-242 (May 2011): 2076–79. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.2076.
Повний текст джерелаАнотація:
Membrane emulsification-suspension polymerization method was introduced to prepare the monodisperse hypercrosslinked adsorbents ZQ-1 and ZQ-2 which can be used in solid phase extraction (SPE). Compared with the commercially available adsorbent LichrolutEN, ZQ-1 exhibits obvious superiority for five conventional polar analytes owing to its large specific surface area, hydrophilic groups and small particle size.
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Litynska, Marta, and Tetiana Dontsova. "SUSPENSION SORBENTS FOR REMOVAL OF ARSENIC COMPOUNDS AND HUMATES FROM WATER." WATER AND WATER PURIFICATION TECHNOLOGIES. SCIENTIFIC AND TECHNICAL NEWS 28, no. 3 (November 9, 2020): 14–25. http://dx.doi.org/10.20535/wptstn.v28i3.218046.
Повний текст джерелаАнотація:
This paper is devoted to the features of the synthesis and applications of suspension iron(III)-based sorbents in water treatment. The problems of toxic impurities of the drinking water, especially soluble arsenic compounds or different organic disinfection by-products, are very acute not only for Ukraine, but for many other countries too. So, it is very important to find simple and effective method to treat polluted natural waters to the required quality. The comparison of different treatment methods for removal of arsenic compounds and humates was made, as a result of which it was determined that the usage of adsorbents, especially fine particle iron-based sorbents, is very effective in natural organic matter removal and some other pollutants. Fine particle iron-based adsorbents are effective for arsenic removal due to its chemical structure. These materials removed arsenic compounds by chemisorption processes and immobilization of arsenate and arsenite ions in the insoluble form of ferric arsenate. Thus, the aim of the work was to develop the adsorbent for effective removal of arsenic compounds and humates from natural waters. We synthesized 7 suspension iron(III)-based sorbents by homogeneous precipitation from FeCl3 solution by thermal hydrolysis of urea. The efficiency of synthesized samples was checked by adsorption tests (humates and arsenite removal) and capillary suction time test. Iron(III) oxyhydroxide was the main phase of the most effective fine particle adsorbents. Applications on natural water showed that the synthesized iron(III) oxyhydroxide effectively removed arsenic compounds not only from model waters, but also from natural water with reaching of regulatory requirements.
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Koju, Rashmi, Agni Dhakal, Sushila Gwachha, Dev Raj Joshi, Tista Prasai Joshi, and Sujen Man Shrestha. "Adsorption of Inorganic As(III) from Aqueous Solutions by Iron-Manganese Oxide." Scientific World 13, no. 13 (August 7, 2020): 46–50. http://dx.doi.org/10.3126/sw.v13i13.30538.
Повний текст джерелаАнотація:
Arsenic contamination in water is well noted public health issue in Nepal and elsewhere. Adsorbents are important chemical means to purify the arsenic contaminated water. In this study the adsorption of As(III) on iron manganese oxide has been investigated as a function of different parameters. Herein, two iron based adsorbents, iron-manganese oxide-1 (Fe-Mn oxide-1) and iron-manganese oxide-2 (Fe-Mn oxide-2) were prepared by oxidation and co-precipitation methods. Adsorbents were characterized by powder X-ray diffraction (XRD) and scanning electron microscope (SEM). Within 4 hours of reaction time, 90% of the arsenic was removed by both Fe-Mn oxides and removal efficiency of the Fe-Mn oxide-1 was obtained higher than that of Fe-Mn oxide-2. Pseudo-second order model was well fitted to describe adsorption kinetic (R2 =0.99) for both adsorbents. Removal efficiency of the absorbents decreased with increase in the pH value and increased with increase in the concentration of adsorbent in the suspension. Based on the result, the synthesized Fe-Mn oxides have significant potential applications in the inorganic arsenic treatment in the water.
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Stojanovic, Ana, Aleksandra Dakovic, Srdjan Matijasevic, George Rottinghaus, Zivko Sekulic, and Tanja Stanic. "Adsorption of T-2 toxin by natural mineral adsorbents." Chemical Industry 62, no. 2 (2008): 59–63. http://dx.doi.org/10.2298/hemind0802059s.
Повний текст джерелаАнотація:
The contamination of animal feed with mycotoxins represents a worldwide problem leading to economic losses in animal production. According to the Food and Agriculture Organization (FAO), 25% of the world's cereal grain production is contaminated with mycotoxins. The most common mycotoxins found in grains are the aflatoxins, ochratoxins, fumonisins, trichothecenes, zearalenone and the ergopeptine alkaloids. Trichothecenes, constitute the largest group of Fusarium mycotoxins. Among others, T-2 toxin is the most acute toxic trichothecene. In this paper, adsorption of T-2 toxin by natural mineral adsorbents zeolite-clinop-tilolite and smectite minerals - bentonite and hectorite, at pH 3 was investigated. The highest adsorption index was achieved for hectorite (95%), while clinoptilolite and bentonite showed low adsorption index for T-2 toxin, 8% and 13%, respectively. Results of T-2 toxin adsorption on hectorite, at different amount of solid phase in suspension, and at pH 3, 7 and 9, showed that toxin adsorption indexes increased with increase of adsorbent concentration in suspension, at all investigated pH values. No significant differences in T-2 toxin adsorption by hectorite, at pH 3, 7 and 9 were observed.
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Wiśniewska, Małgorzata, Teresa Urban, Agnieszka Nosal-Wiercińska, Vladimir Zarko, and Vladimir Gun’ko. "Comparison of stability properties of poly(acrylic acid) adsorbed on the surface of silica, alumina and mixed silica-alumina nanoparticles — application of turbidimetry method." Open Chemistry 12, no. 4 (April 1, 2014): 476–79. http://dx.doi.org/10.2478/s11532-013-0401-6.
Повний текст джерелаАнотація:
AbstractThe influence of anionic poly(acrylic acid) — PAA addition on the stability of synthesized silica, alumina and mixed silica-alumina suspensions as a function of solution pH was studied. The turbidimetry method was used to monitor the changes of the examined systems stability over time. The calculated stability coefficients enabled estimation of polymer adsorption influence on stability of metal oxide suspension. It was shown that the alumina suspension without the polymer is the most unstable at the pH values 6 and 9, whereas the silica polymer was most unstable at pH 3. PAA with higher molecular weight (240 000) is a relatively effective stabilizer of all investigated adsorbents (except silica at pH 3). These properties of poly(acrylic acid) are highly desirable in many branches of industry (e.g. production of cosmetics, pharmaceuticals, paints) where polymers are widely used as effective stabilizers of colloidal suspensions.
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Chugunov, A. D., and E. G. Filatova. "Adsorption of petroleum products by modified and activated adsorbents." Proceedings of Universities. Applied Chemistry and Biotechnology 11, no. 2 (July 4, 2021): 318–25. http://dx.doi.org/10.21285/2227-2925-2021-11-2-318-325.
Повний текст джерелаАнотація:
This research is aimed at investigating the adsorption of petroleum products from aqueous solutions by adsorbents modified with HCl and those activated by microwave radiation. The research objects were carbon adsorbents: activated coals, such as AD-05-2, IPI-T, KAD-iodine and zeolites of the TransBaikal deposit. The quantitative analysis of waters (standardised test solutions with an initial concentration of petroleum products not exceeding 10 mg/l) was carried out by the fluorimetric method using a Fluorat-02 liquid analyser. The adsorbents were activated in a microwave oven at a wave power of 800 W for 1 min. The modification was carried out according to the following procedure: 10 g of the adsorbents dried to a constant weight at a temperature of 120-150 °C were stirred for 24 h with 200 ml of a 12% HCl solution in water.Next, the suspension was filtered and washed with distilled water until neutral. It was found that the value of adsorption of petroleum products by adsorbents modified with HCl increases by 3.8 times for activated carbon KAD-iodine, 0.5 times for IPI-T, and equals 0.71 mg/g and 0.80 mg/g respectively. Among the studied sorbents, these sorbents have the largest grain size (3-5 mm) and micropore volume (0.28-0.29 cm3/g). It was established that the method of short-term (within 1 min) microwave activation makes it possible to increase the adsorption of petroleum products by: 4.2 times for activated carbon KAD-iodine and 0.6 times for IPI-T in comparison with the original adsorbents. The highest adsorption value of petroleum products corresponds to zeolites and equals 0.99 mg/g. The action of microwave radiation is associated with the dissociation and evaporation of the water bound in the adsorbents and flammable organic substances, which leads to an increase in the porosity of the adsorbent. The application of the microwave activation method is highly promising in comparison with the classic methods of chemical and steam-gas activation. This method simplifies the technological design and reduces the consumption of reagents for the production of effective adsorbents used to extract petroleum products from aqueous solutions, which acquires particular importance in the context of maintaining the environmental safety of water use.
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NASIRUDDIN KHAN, M., and ANILA SARWAR. "DETERMINATION OF POINTS OF ZERO CHARGE OF NATURAL AND TREATED ADSORBENTS." Surface Review and Letters 14, no. 03 (June 2007): 461–69. http://dx.doi.org/10.1142/s0218625x07009517.
Повний текст джерелаАнотація:
Although particle size and its measurement are intuitively familiar to particle technologists, the concept of point of zero charge (pzc) is less widely understood and applied. This is unfortunate since it is at least as fundamentally important as particle size in determining the behavior of particulate materials, especially those with sizes in the colloidal range below a micrometer. pzc is related to the charge on the surface of the particle and strongly depends on the pH of the material; so it influences a wide range of properties of colloidal materials, such as their stability, interaction with electrolytes, suspension rheology, and ion exchange capacity. The pH dependence of surface charges was quantified for four different adsorbent–aqueous solution interfaces. The points of zero charge were determined for activated charcoal, granite sand, lakhra coal, and ground corn cob materials using three methods: (1) the pH drift method, measuring pH where the adsorbent behaves as a neutral specie; (2) potentiometric titration, measuring the adsorption of H + and OH - on surfaces in solutions of varying ionic strengths; (3) direct assessment of the surface charge via nonspecific ion adsorption as a function of pH. The intrinsic acidity constants for acid and base equilibria, [Formula: see text] and [Formula: see text], were also calculated. Lakhra coal was found to have the lowest pzc value among all other adsorbents studied owing to the presence of a large amount of humus material. The results were used to explain general connections among points of zero charges, cation exchange capacity, and base saturation % of adsorbents.
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Croitoru, Alexa-Maria, Anton Ficai, Denisa Ficai, Roxana Trusca, Georgiana Dolete, Ecaterina Andronescu, and Stefan Claudiu Turculet. "Chitosan/Graphene Oxide Nanocomposite Membranes as Adsorbents with Applications in Water Purification." Materials 13, no. 7 (April 4, 2020): 1687. http://dx.doi.org/10.3390/ma13071687.
Повний текст джерелаАнотація:
The scope of this article is to develop composite membranes using chitosan (CS) and graphene oxide (GO) as adsorbents for the removal of inorganic pollutants such as heavy metal ions, particularly Pb2+, from aqueous solutions. GO was obtained by modified Hummers method and blended with CS solution. The introduction of ethylenediaminetetraacetic acid (EDTA) compound to CS/GO suspension lead to an increased adsorption capacity of CS/GO for the elimination of heavy metals by forming stable chelates with them. The synthesized membranes were examined by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), and the adsorption behaviour of Pb2+ from aqueous solutions using CS/EDTA/GO membranes was evaluated using inductively coupled plasma mass spectrometry (ICP-MS). The adsorption performance of Pb2+ ions was studied by monitoring the concentration of Pb2+ against the adsorption period at an initial content of the adsorbent. The maximum adsorption efficiency of Pb2+ metal ions reached 767 mg·g−1 for CS/EDTA/GO 0.1%, 889 mg·g−1 for CS/EDTA/GO 0.3%, 970 mg·g−1 for CS/EDTA, 853 mg·g−1 for CS and 1526 mg·g−1 for GO. These findings show promising potential for CS/EDTA/GO membranes as effective adsorbent materials for the removal of heavy metal ions in water.
Дисертації з теми "Suspension adsorbents"
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Літинська, Марта Ігорівна. "Видалення сполук арсену та гуматів з водного середовища". Doctoral thesis, Київ, 2021. https://ela.kpi.ua/handle/123456789/40411.
Повний текст джерелаАнотація:
Дисертаційна робота присвячена розробці та науковому обгрунтуванню методу для ефективного видалення сполук арсену різних ступенів окиснення та гуматів з природних вод.
В дисертації теоретично (на основі літературних даних та розрахунків) та експериментально (в результаті сорбційних досліджень) обгрунтовано вибір сполук феруму, як основного сорбуючого компоненту для видалення сполук арсену з водного середовища. Різними способами (гетерогенне осадження, гомогенне осадження, гідротермальний метод) синтезовано ряд ферумвмісних сорбційних матеріалів, серед яких порошкові, зернисті на основі активованого вугілля та суспензійні сорбенти.
Визначено, що використання комбінації «дрібнодисперсний ферум(ІІІ) оксигідроксид/мембрана» дозволяє вилучати сполуки арсену з модельних та підземних вод до санітарних вимог за вихідних концентрацій арсену 500-16733 мкг/дм3 та відділяти відпрацьований дрібнодисперсний ферумвмісний сорбент від води і захищає мембрани від засмічування.
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David, Bernard. "Phototransformation de composes organiques non hydrosolubles, adsorbes sur du gel de silice, en suspension dans l'eau." Clermont-Ferrand 2, 1992. http://www.theses.fr/1992CLF21425.
Повний текст джерелаАнотація:
Une methodologie a ete mise au point pour l'etude de la phototransformation de polluants organiques non hydrosolubles disperses en milieu aqueux apres adsorption sur des supports chimiquement stables. La difficulte de cette etude vient de la faible quantite de produits mis en jeu pour rester dans des conditions representatives de l'environnement. Le travail presente porte principalement sur la phototransformation de trois hydrocarbures aromatiques polycycliques, l'anthracene, le phenanthrene et le benz-a-anthracene adsorbes sur deux types de gel de silice, la silice icn 32-63 et la silice tixosil 331, dont les proprietes physico-chimiques ont prealablement ete etudiees. Par irradiation entre 300 et 350 nm en milieu aere, les 2 hap cites conduisent principalement a la formation de quinones et de peroxyde d'hydrogene en quantites equivalentes, mais une formation mineure de produits hydroxyles a neanmoins pu etre mise en evidence. Bien que chimiquement stable, la silice semble jouer un role actif dans la transformation puisque la reaction est plus rapide avec ce support qu'avec l'oxyde ferrique, la montmorillonite (argile) ou la cellulose. Un mecanisme mettant en jeu un transfert de charge entre le hap et la silice est propose. La cinetique de la reaction est assez complexe. Elle depend a la fois du type de silice, du taux de recouvrement et de l'avancement de la reaction. Ceci est attribue a l'intervention de differents types de sites, dont l'hydratation diminue la reactivite. Par ailleurs, les quinones formees semblent jouer un role sensibilisateur sur la transformation du hap. Deux herbicides, le diflufenican et l'oxadiazon, et un azurant, le bbot, ont ete etudies a titre d'application
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Le, Bars Nathalie. "Relation entre la structure des couches adsorbees, l'etat de dispersion et le proprietes rheologiques dans les suspensions concentrees des poudres ceramiques." Orléans, 1992. http://www.theses.fr/1992ORLE2022.
Повний текст джерелаАнотація:
Ce travail s'inscrit dans le cadre d'une etude generale visant a maitriser le procede de mise en forme de ceramiques pour l'electronique par coulage en bande. Dans ce cadre, nous avons traite differents aspects du processus de desagglomeration des poudres d'alumine et de titanate de baryum par un tensio-actif de type oxyethyl alkyl ester phosphate dans un milieu organique polaire. Il s'agissait dans un premier temps, de caracteriser la surface des poudres et l'etat de dissociation des molecules de tension-actif dans le milieu, puis de determiner un modele d'adsorption de ces molecules a la surface des poudres, et enfin, d'etudier l'etat d'agglomeration de la poudre dans le milieu et le comportement rheologique des suspensions, en correlation avec le taux de recouvrement. Le mecanisme d'adsorption propose correspond a la formation d'une monocouche de tensio-actif a la surface des poudres par creation de laisons iono-covalentes entre les sites de surface des poudres hydrophiles, et les tetes phosphate ionisees du tensio-actif. Une etude spectroscopique de rmn du noyau #3#1p a permis d'acceder a la mobilite des molecules de tensio-actif dans la couche adsorbee. A travers des mesures de viscosite et de vitesse de sedimentation, nous avons mis en evidence le role desagglomerant du tensio-actif et nous avons montre que le comportement hydrodynamique des suspensions est directement relie a un volume d'enveloppe d'agglomerats, lui-meme directement relie au taux de recouvrement de la surface des poudres par le tensio-actif
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Lin, Ya-Wen, and 林雅雯. "Preparation of Suspension Adsorbent for Heavy Metals from Waste Oyster Shells." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/38715848290661727151.
Повний текст джерелаАнотація:
碩士國立屏東科技大學
環境工程與科學系所
95
A suspension adsorbent absorbent made from oyster shells powder was developed for the absorption of heavy metals in rivers. Wasted oyster shells were collected from the roadside at Chia-I County, and these shells were crushed and sieved into five fractions. Chemical and physical properties of the five sieving fractions are analyzed by sedimentional test, XRF, BET analyzer at first. Experimental results indicate that the fraction with 37μm has the highest surface area (6.93m2/g) and CaCO3 content.(90%) There heavy metals, Pb, Cd and Cr; were used for the absorption test of the prepared oyster shells. Results show that 96% of Cd can be removed within 2 h by 74μm and 37μm fractions. And Ca 100% of Cr can be removed after 16h. The percentages of suspension ability are 0.42% for 149um sieving fraction, 0.27% for 104 μm sieving fraction, and 0.30% for 37μm sieving fraction.
Тези доповідей конференцій з теми "Suspension adsorbents"
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Popović, Ana, Jelena Rusmirović, Maja Đolić, Zlate Veličković, and Aleksandar Marinković. "Lignin Based Porous, Microsphere-Shaped Adsorbent Functionalized with Magnetite Nanoparticles for Effective Chromate Anions Removal." In 34th International Congress on Process Industry. SMEITS, 2021. http://dx.doi.org/10.24094/ptk.021.34.1.133.
Повний текст джерелаАнотація:
Research goal of this paper represents a novel method of synthesis of an amino-modified, highly effective natural polymer adsorbent kraft lignin based, functionalized with magnetite nanoparticles, for effective removal of chromate anions from water solution. Amino-modified lignin microspheres (LMS-NM) were synthesized via inverse suspension copolymerization of kraft lignin with poly(ethylene imine) grafting-agent and epichlorohydrin cross-linker. The porous structure of the synthesized adsorbent was formed using a 5.0 wt.% sodium-alginate solution. Additional efficiency in the removal of chromium anions from water was achieved by functionalization of lignin microspheres with magnetite (NM) nanoparticles obtained by co-precipitation and additional introduction of amino groups. Structure of formed LMS-NM was confirmed via Furrier Transform Infrared (FTIR) Spectroscopy. Optical microscopy analyses showed the creation of sphere-shaped materials and showed the diameter of prepared LMS-NM in the range of 500 to 800 µm. The removal of chromate anions from water solution was performed in a batch system. The result confirmed high adsorption efficiency and potential application of this nature-based adsorbent for heavy metal anions removal. This work was supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia, as part of the following projects: 451-03-9/2021-14/200325 and 451-03-9/2021-14/200135, with the contribution of the COST Action CA17128.