Toxicity and Bacterial Decolourization of Textile Dyes (original) (raw)
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Factor Affecting Textile Dye Removal Using Adsorbent From Activated Carbon: A Review
MATEC Web of Conferences, 2017
Industrial company such as textile, leather, cosmetics, paper and plastic generated wastewater containing large amount of dye colour. The removal of dye materials are importance as the presence of this kind of pollutant influence the quality of water and makes it aesthetically unpleasant. As their chemical structures are complicated, it is difficult to treat dyes with municipal waste treatment operations. Even a small quantity of dye does cause high visibility and undesirability. There have been various treatment technique reviewed for the removal of dye in wastewater. However, these treatment process has made it to another expensive treatment method. This review focus on the application of adsorbent in dye removal from textile wastewater as the most economical and effective method, adsorption has become the most preferred method to remove dye. The review provides literature information about different basis materials used to produce activated carbon like agricultural waste and industrial waste as well as the operational parameters factors in term of contact time, adsorbent dosage, pH solution and initial dye concentration that will affect the process in removing textile dye. This review approach the low cost and environmental friendly adsorbent for replacing conventional activated carbon.
Removal of Dyes of Textile Rejects by Activated Carbon
Journal of Applied Solution Chemistry and Modeling, 2016
The composition of wastewater from the textile industry varies enormously from one moment to another depending on the nature of the dyes used, the type of tissue, methods used and the concentration of added chemicals. In most cases the dye effluents are characterized by strong color, high temperatures, high and random values of pH, amounts of suspended solids and COD-concentrations close to the limit values set by the draft Moroccan standards. The study of turbidity indicates a variation between 120 and 190 NTU for the three samples. As for their conductivity varies between 5,2 and 20 mS.cm-1. Moreover their pH varies in the field of basic pH. Measuring the temperature of these three samples showed values varying between 25 and 30 ° C. The levels of suspended solids range between 146,8 and 514,7 mg L-1. The results show that the measured absorbance at 436 nm decreased to 2,020 A and it stabilizes at this value. To the absorbance of the color measured at 525 nm decreases to 3,072 A and it stabilizes. The absorbance measured at the wavelength 620 nm decreases and reaches a minimum value of 1, 918 A after ten hours.
2019
In this work, the activated carbon (corn-cob source) preparation from corn-cob source utilizing the operation of activating H2SO4, a frugal items, display Showed acceptable behavior in eliminating oxygen through absorption Methylene Blue (MB), crystal violet (CV) Maxilone blue (GRL ) of an aqueous solution. The adsorbent was characterized with (FT-IR), and (SEM). The adsorption studies were done to estimate the influence of primary concentration (10-100 mg L-1), pH (2–10), mass (0.02– 2 g) and influence of heat (16-45 0C). It discovered pH has main part in adsorption operation ; adsorption ability was effected by the adsorption capacity of the physical characteristics and surface chemicals carbon and pH of the solution. The experimental information was analyzed by three various kinds of isotherm samples, the Langmuir Isotherm, the Freundlich Isotherm and Temkin Isotherm at a various temperatures. The experimental outcomes are well fitted with homogeneous Freundlich and Tempkin isoth...
In the present work, we have investigated the sorption efficiency of the treated activated carbon from walnut shell (ACW) towards Direct Red 81 (DR81) and Direct Blue 71 (DB71) for the removal from aqueous solution. The sorption study of ACW at the solid-liquid interface was investigated using kinetic, sorption isotherms, pH effect and amount of adsorbent. Experimental data were analyzed by Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) isotherms. Langmuir isotherm model (R2 =0.9664 and R2 =0.9484) fitted the equilibrium data the best other isotherms for DR81 and DB7I. According to the results maximum adsorption occurred in acidic pH. The results showed that the sorption processes of DR81 and DB71 on ACW are in good agreement with pseudosecond order kinetic. Maximum amount of adsorbent for adsorption of mentioned dyes was 1 gr.
Removal of Textile dye by Using Activated Carbon in Aqueous Solution
2020
Two textile dye (indigo carmine and acid blue 25) were removed using activated carbon (AC) as solid adsorbent. Effects of various parameters such as adsorbent dosage, contact time, kinetics and thermodynamic properties were investigated by batch adsorption technique. The results shown that the adsorption kinetics of textile dye was determined by the pseudo-second order model and adsorption isotherms fitted very well with Langmuir model. In addition, thermodynamic properties indicated that the adsorption of both textile dye on AC were endothermic and spontaneous process. The maximum adsorption capacities (qm) of indigo carmine and acid blue 25 onto AC was 89.29-104.17 mg/g and 1,428.00-2,000.00 mg/g, respectively. This results could be explained by stronger interaction between acid blue 25 and AC. This work indicated that AC can be used as an alternative adsorbent for removal of textile dye especially acid blue 25, due to the low cost and high efficiency of adsorption capacity. Keywo...
Journal of Hazardous Materials, 2006
Removal of acid dyes Acid Blue 45, Acid Blue 92, Acid Blue 120 and Acid Blue 129 from aqueous solutions by adsorption onto high area activated carbon cloth (ACC) was investigated. Kinetics of adsorption was followed by in situ UV-spectroscopy and the data were treated according to pseudo-first-order, pseudo-second-order and intraparticle diffusion models. It was found that the adsorption process of these dyes onto ACC follows the pseudo-second-order model. Adsorption isotherms were derived at 25 • C on the basis of batch analysis. Isotherm data were treated according to Langmuir and Freundlich models. The fits of experimental data to these equations were examined.
Indian Journal of Chemical Technology
Removal of dye Green B using two different samples of activated carbon by static-batch method and continuous process was studied. Experimental data on optical density of blank solutions of different concentrations ranging from 10 to 100mg/L and optical density of solutions after adsorption on activated carbon samples were taken and analyzed. Calibration curves were plotted and the amount of dye adsorbed was calculated. The data was fitted to Langmuir and Freundlich isotherms for two different carbon samples and concentration values. Constants were calculated from the slope and intercept values of the isotherm. Coefficient of correlation R 2 and standard deviation SD were also noted. The data fitted well to the isotherms. Carbon sample C 1 showed considerably higher potential to adsorb the dye Green B as compared to carbon sample C 2. Adsorption was better in batch process in respect to continuous flow method. From the analysis of the data it is shown that both activated carbon samples had a good capacity to remove the textile dye from the residue wastewater.
Adsorption mechanism of synthetic reactive dye wastewater by chitosan
Journal of Colloid and Interface Science, 2005
Chitosan was able to remove the color from synthetic reactive dye wastewater (SRDW) under acidic and caustic conditions. The effect of the initial pH on SRDW indicated that electrostatic interaction occurred between the effective functional groups (amino groups) and the dye under acidic conditions. Moreover, SRDW adsorption under caustic conditions was also affected by the covalent bonding of dye and hydroxyl groups of chitosan. In addition, elution tests confirmed that chemical adsorption occurred under acidic conditions, while both physical and chemical adsorption appeared under caustic conditions. The spectra of attenuated total reflectance Fourier transform infrared spectrometry confirmed the functional groups of chitosan that affected the SRDW adsorption. However, the maximum adsorption capacities of chitosan increased when the temperature increased. The maximum adsorption capacity of chitosan obtained from the Langmuir model was 68, 110, and 156 mg g −1 under a system pH of 11.0 at 20, 40, and 60 • C, respectively. The negative values of enthalpy change (H), free energy change (G), and entropy change (S) indicated an exothermic, spontaneous process and decreasing disorder of the system, respectively. Therefore, the mechanism of SRDW adsorption by chitosan was probably by chemical adsorption for a wide range of pH's and at high temperatures.