Bibliografías temáticas / Chromium complex dyes

Literatura académica sobre el tema "Chromium complex dyes"

Autor: Grafiati
Publicado: 6 de septiembre de 2023

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Artículos de revistas sobre el tema "Chromium complex dyes"

1

Yildiz, E. y N. Bozok. "Synthesis of Compounds Containing Fluorine, Vinylsulfone Groups and Transition Metal Complexes and their Applications to Textiles". E-Journal of Chemistry 5, s1 (2008): S997—S1007. http://dx.doi.org/10.1155/2008/348037.

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A ligand which has reactive dye character and its transition metal complexes such as Cu(II), Co(II), Cr(III), Ni(II) containing vinylsulfone and fluorine groups were synthesized. The diazotation reaction has been studied at 0-5°C carefully. Completion of the reaction was monitored by the TLC method. FT-IR, UV,1H-NMR, TGA and microanalysis methods were used for determination of the synthesized compounds. We assumed that copper complex indicated dimeric structure based on magnetic susceptibility result. All the synthesized compounds which have dye character were applied on cotton, polyamide and nylon fibers. Their dyeing and fastness properties were investigated according to international standards. These properties gave good results for all synthesized dyes except light fastnesses of chromium and nickel complex dyes.
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2

Wang, Ing Jing, Yu Jen Hsu y Jyn Hen Tian. "Synthesis and properties of some pyridone chromium complex azo dyes". Dyes and Pigments 16, n.º 2 (enero de 1991): 83–91. http://dx.doi.org/10.1016/0143-7208(91)85001-o.

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3

Copaciu, Florina-Maria, Dorina Simedru y Maria-Virginia Coman. "Determination of Three Chromium Textile Azo Dyes in Wastewater by SPE-LC-ESI(–)-MS/MS". Journal of AOAC INTERNATIONAL 101, n.º 5 (1 de septiembre de 2018): 1422–28. http://dx.doi.org/10.5740/jaoacint.18-0059.

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Abstract In the present work, a procedure to determine three textile azo dyes, chromium-complexes [Nylosan Dark Brown (NDB), Lanasyn Dark Brown (LDB), and Lanasyn Red (LR)], from wastewater using solid-phase extraction (SPE) followed by LC-electrospray ionization negative mode tandem mass spectrometry (LC-ESI(–)-MS/MS) has been developed. The extraction/concentration and recovery degree of these dyes from liquid matrices were done on Strata WAX/NH2 cartridges. The chromatographic separation was performed using a Luna C18 (2) 100Å column by isocratic elution with a methanol–acetonitrile–water (0.2% formic acid and 2 mM ammonium formate) mixture. The linearity, the LOD, and the LOQ were determined for each textile dye. The accuracy, the precision (intra- and inter-day), and the matrix effect were also performed for the validation of the developed procedure. These chromium-complex azo dyes often used in the dyeing process by a textile factory in Romania were monitored in the influent and effluent wastewater from a treatment plant situated in its area. Applying the developed SPE-LC-ESI(–)-MS/MS procedure, the following textile dyes were detected (ng/L) in the collected wastewater samples during a 24-h period: NDB 150.1, LDB 200.6, and LR 89.0–244.0 in influents and NDB 22.8, LDB 78.6, and LR 74.0 in effluents.
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4

RACE, E., F. M. BOWE y J. B. SPEAKMAN. "The Nature of the Dye-Chromium-Fibre Complex in the Case of Wool Dyed with Certain Chrome Mordant Dyes". Journal of the Society of Dyers and Colourists 62, n.º 12 (22 de octubre de 2008): 372–83. http://dx.doi.org/10.1111/j.1478-4408.1946.tb02390.x.

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5

Arslan-Alaton, I., I. Kabdaşlı y S. Teksoy. "Effect of Fenton's treatment on the biodegradability of chromium-complex azo dyes". Water Science and Technology 55, n.º 12 (1 de junio de 2007): 107–12. http://dx.doi.org/10.2166/wst.2007.388.

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Pretreatment of an acid dyebath effluent bearing a new generation chromium complex azo dyestuff (Co=350 mg/L) with Fenton's reagent was investigated. Preliminary optimisation (baseline) experiments were conducted to determine the Fe2 + , H2O2 concentrations and pH required to the highest possible COD and colour removals. Kinetic studies were carried out at varying temperatures (20 °C < T<70 °C) to establish a relationship between COD abatement and H2O2 consumption. The activation energy found for catalytic H2O2 decomposition (Ea=9.8 kJ/mol) appeared to be significantly less than that of fermentative (Ea=23 kJ/mol) and of thermal (Ea=76 kJ/mol) H2O2 decomposition, implying that H2O2 decomposition during the Fenton's reaction occurs more spontaneously. The experimental studies indicated that approximately 30% COD and complete colour removal could be achieved under optimised Fenton pretreatment conditions (Fe2 + =2 mM; H2O2=30 mM; pH = 3; at T = 60 °C). Long-term activated sludge experiments revealed that although the raw and pretreated acid dyebath effluent contained practically the same amount of “readily biodegradable” COD (inert COD fraction ≤10%), biodegradation of the chemically pretreated acid dye effluent proceeded appreciably faster than that of the untreated acid dyebath effluent.
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6

Ghosh, Arpita, Manisha Ghosh Dastidar y T. R. Sreekrishnan. "Response surface modeling of bioremediation of acid black 52 dye using Aspergillus flavus". Water Science and Technology 75, n.º 12 (21 de marzo de 2017): 2864–74. http://dx.doi.org/10.2166/wst.2017.167.

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Bioremediation is an efficient process to remove metals and dyes from solutions using different micro-organisms. In the present study, the efficiency of growing Aspergillus flavus (isolated from the effluent of an electroplating industry) to treat a synthetic solution of acid black 52 dye (a trivalent chromium complex dye) was investigated. Maximum removal of dye and chromium was observed to be 390 and 17.22 mg/L, respectively, at an initial dye concentration of 750 mg/L and at pH 4.5 in 50 hours in a batch bioreactor. The biomass concentration was reduced from 4.1 to 0.4 g/L with increasing dye concentration from 100 to 2,000 mg/L. The response surface modeling for color removal was performed using the range of initial dye concentration 200–400 mg/L, pH 4–6 and time 35–50 hours. The optimum conditions for maximum color removal (76.52%) were observed at initial dye concentration: 200 mg/L, pH: 4.75 and time: 50 hours. The deviation (−0.02%) showed a close agreement between the experimental and predicted values of color removal. The scanning electron microscopic and energy dispersive X-ray analyses indicated bioremediation of the dye.
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7

Ghosh, Arpita, Manisha Ghosh Dastidar y T. R. Sreekrishnan. "Bioremediation of chromium complex dyes and treatment of sludge generated during the process". International Biodeterioration & Biodegradation 119 (abril de 2017): 448–60. http://dx.doi.org/10.1016/j.ibiod.2016.08.013.

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Vostrikova, N. L., M. Yu Minaev y K. G. Chikovani. "Determining the authenticity of turmeric". Food systems 4, n.º 1 (28 de abril de 2021): 62–70. http://dx.doi.org/10.21323/2618-9771-2021-4-1-62-70.

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The paper examines the problem of the composition instability in the ready ground spice, turmeric. Analysis of the prevalent methods for turmeric adulteration and substances used for these purposes is given. The visual assessment of color tints of the turmeric root, spices containing it and chemical dyes based on chromium salts is presented. The studies on determination of the lead and chromium content were carried out to study the content of these metals and test the hypothesis of using lead chromate as a dye in adulteration of turmeric. Using the method of electrothermal atomic absorption spectroscopy, it was found that the lead content in the analyzed turmeric samples varied from 1.72 ± 0.58 to 5.03 ± 1.80 mg/kg, while the chromium content was in a range of 5.56 ± 0.85 to 16.15 ± 2.32 mg/kg. As a result of species specific PCR, wheat DNA was revealed in all purchased samples of ground turmeric. The levels of the main raw material replacement were established, which were 0.14% to 14.95% with the correlation coefficient close to 100%; efficiency of the reaction was 1.95, which was 97.5% when expressed as percentage. These levels of an undeclared allergen in the product composition can cause a serious allergic reaction. The authors tested the hypothesis of introduction of sodium and potassium salts for correction of the color spectrum in the ready spice and its correspondence to the natural color within the color spectrum of turmeric. As a result of the complex study of the spice composition, quite high values of chromium were found, presumably not only from the lead chromate compound but also from chromic acid salts, as the high level of potassium that significantly exceeded the native content of this element was found.
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9

Choe, Eun Kyung, Young-Zu Kim, Young Dal Cho y Seung Hwan Son. "Study on analytical scheme for human ecological quality control of chromium-complex acid dyes". Textile Research Journal 86, n.º 17 (22 de julio de 2016): 1847–58. http://dx.doi.org/10.1177/0040517515617421.

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Wołowicz, Anna, Monika Wawrzkiewicz y Zbigniew Hubicki. "Toxic Heavy Metal Ions and Metal-Complex Dyes Removal from Aqueous Solutions Using an Ion Exchanger and Titanium Dioxide". Fibres and Textiles in Eastern Europe 26, n.º 2(128) (30 de abril de 2018): 108–14. http://dx.doi.org/10.5604/01.3001.0011.5748.

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The aim of the study was to compare the removal efficiency of toxic heavy metal ions: chromium(VI), nickel(II) and copper(II) as well as metal-complex dyes from aqueous solution using Lewatite VPOC 1065 and AdsorbsiaTM As500. The point of zero charge (pHPZC) of both sorbents and the influence of the initial concentration on the sorption process of Ni(II), Cu(II), Cr(VI), C.I. Acid Red 183 (AR183), C.I. Reactive Blue 21 (RB21) and nickel(II) phthalocyanine-tetrasulfonic acid tetrasodium salt (NiPc-TSATSS) were studied to determine the maximum sorption capacity. Kinetic studies were also carried out for the most effective sorbent-sorbate systems. The concentration effect of both hydrochloric acid and auxiliaries on the removal yield was also taken into account. As was found, Lewatit VPOC 1065 can be successfully applied for the treatment of textile wastewaters containing metal complex dyes and heavy metal ions. The highest sorption capacity, qe = 816.1 mg/g, was found for C.I. Acid Red 183.
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Tesis sobre el tema "Chromium complex dyes"

1

Congiu, Martina. "Synthesis and characterisation of luminescent lanthanide dyes for solar energy conversion". Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7724.

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Lanthanide (III) complexes are used extensively in solar conversion devices, such as Luminescent Solar Concentrators (LSCs) and Luminescent Down-Shifting (LDS) for their peculiar characteristics of narrow band emission, avoidance of re-absorption losses due to large Stokes shift and possibility of high photoluminescence quantum yield (PLQY). The study has looked into the synthesis of Ln (III) complexes of the general formula: [Ln(hfac)3DPEPO], where DPEPO = bis(2-(diphenylphosphino)phenyl)ether oxide, and hfac = hexafluoroacetylacetonate. The work presented in this thesis focuses on the synthesis, and subsequent photophysical characterisation of these Ln(III) complexes, plus characterisation and spectroscopic study of [Tb(pobz)3(hacim)2], (where Hpobz = phenoxybenzoic acid, and Hacim = acetylacetone imine), yielding results that open new design of functional Ln(III) systems. Spectroscopic study of Chromium dioxalate and analogous compounds has revealed that with the appropriate design, Cr(III)Ln(III) energy transfer can be achieved, while study of polyaromatic hydrocarbons (PAH) such as coronene, enable to explore a ligand with better absorption in the whole UV region. These results open attractive perspectives for light-conversion systems, such as LSC devices.
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2

Kirkutė, Jolita. "Chromo kompleksinių dažiklių sorbcija jonitais ir aktyvintosiomis anglimis". Master's thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080924_175512-64908.

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Chromo kompleksinių dažiklių: rūgštinio rudojo (1:1 ir 1:2 chromo kompleksai) ir rūgštinio mėlynojo (1:2 chromo kompleksas) sorbcija aktyvintąja anglimi, neutraliu sorbentu, anijonitu bei chelatiniu jonitu atlikta statinėmis sąlygomis, keičiant pradinio tirpalo koncentracijas, pH, temperatūrą bei sorbcijos trukmę. Pusiausvirosios sorbcijos eksperimentinės vertės ir apskaičiuoti Langmiuro ir Froindlicho teorinių sorbcijos izotermų paramertrų didžiausios vertės liudija, kad sorbcijai palankiausia tirpalo rūgšti terpė. Gautos sorbcijos kinetinės kreivės ir ištirtos pagal tris kinetikos modelius: pseudo-pirmojo laipsnio reakcijos greičio lygtį, pseudo-antrojo laipsnio reakcijos greičio lygtį ir vidinės difuzijos modelį. Nustatyta, kad sorbcijos kinetika vyksta pagal pseudo-antrojo laipsnio reakcijos lygtį ir yra kontroliuojama vidinės difuzijos procesų. Nustatyti sorbcijos proceso termodinaminiai parametrai H0, S0 ir G0 liudija apie spontanišką, egzoterminę sorbcijos aktyvintąja anglimi, anijonitu bei chelatiniu jonitu prigimtį.
Sorption of two chromium complex dyes (1:1 and 1:2 chromium complex; 1:2 chromium comlex) and from model solutions onto an various types of sorbents was investigated in aqueous solution in a batch experiments with respect to initial solution concentration and pH, contact time, and temperature. The sorption capacity at equilibrium obtained experimental and estimated Langmuir and Freundlich isotherm parameters was demonstrate that acidic media was favourable for dye sorption. The pseudo-first-order, pseudo - second order kinetics models and the diffusion (intraparticle) model were used to describe the kinetics data, and the rate constants were evaluated. Kinetics of dye sorption is observed to confirm pseudo-second order rate expression. The activation energy, change of Gibbs free energy, enthalpy of sorption was also evaluated. The results indicate the sorption process onto activated carbon, anion exchanger and chelating sorbent was egzothermic, spontaneous.
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3

許宇楨. "Synthesis of azo pyridone chromium complex dyes". Thesis, 1986. http://ndltd.ncl.edu.tw/handle/02159944528985717716.

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WANG, FA-SHAN y 王法善. "(1)Preparation and Property Studies of Hydrogenated Epoxy/Graphene Nanocomposites(2)Graphene/Chromium Complex Hybrid Materials for the Counter Electrode of Dye Sensitized Solar Cells". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/7nz83x.

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碩士
輔仁大學
化學系
107
In the first part of research, we prepared hydrogenated diglycidyl ether of bisphenol A (HDGEBA)/graphene nanocomposite materials which incorporated with graphene oxide (GO) or with funtionalized graphene oxide (FGO) by the In-situ polymerization. GO and FGO were characterized by Fourier Transform Infrared Spectrometry (FTIR), X-ray Powder Diffractometer (XRD) and Transmission Electron Microscopy (TEM). The perpoties of epoxy resin/graphene nanocomposite were studied by FTIR, XRD, thermogravimetric analyzer (TGA), TEM, electrochemical impedance spectroscopy (EIS), contact angle and UV accelerated weathering test. Incorporation with 0.5 wt% FGO into hydrogenated DGEBA coating significantly enhanced the corrosion resistant which was attribute to well- dispersed of FGO act as barrier for corrosion factors. The second part of research, we synthesized two kind of GO/chromium complex hybrid materials. The hybrid materials were characterized by FTIR, XRD and TEM. Then we applied the hybrid materials for dye sensitized solar cell (DSSC) counter electrode. The properties of devices were analyzed by J-V curve, EQE and EIS. Results show that compared with the less ligand complex CrCl2, the GO/CrL3 hybrid material showing the better performance in DSSC device. The decive efficiency based on GO/CrL3 (1:1) counter electrode reaching 7.44 %, which was closing the Pt based counter electrode decive efficiency 8.88 %.
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Capítulos de libros sobre el tema "Chromium complex dyes"

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Ghosh, Arpita, Manisha Ghosh Dastidar y T. R. Sreekrishnan. "Bioremediation of Chromium Complex Dye by Growing Aspergillus flavus". En Water Science and Technology Library, 81–92. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-5795-3_8.

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Actas de conferencias sobre el tema "Chromium complex dyes"

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Ghosha, Arpita, Manisha Ghosh Dastidar y T. R. Sreekrishnan. "Optimization of Biosorption of Acid Orange 86 (chromium complex dye) by Aspergillus tamarii using Response Surface Methodology". En Annual International Conference on Advances in Biotechnology. Global Science & Technology Forum (GSTF), 2015. http://dx.doi.org/10.5176/2251-2489_biotech15.35.

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