Adsorption of Textile Dye onto Activated Carbon Prepared from Industrial Waste by ZnCl 2 Activation # (original) (raw)

Removal of methylene blue dye from aqueous solution by activated carbon prepared from cashew nut shell as a new low-cost adsorbent

Korean Journal of Chemical …, 2011

Methylene blue dye was adsorbed on an adsorbent prepared from cashew nut shell. A batch adsorption study was carried out with variable adsorbent amount, initial dye concentration, contact time and pH. Studies showed that the pH of aqueous solutions affected dye removal as a result of removal efficiency increased with increasing solution pH. The experimental data were analyzed by the Langmuir, Freundlich, Redlich-Peterson, Koble-Corrigan, Toth, Temkin, Sips and Dubinin-Radushkevich models of adsorption using MATLAB 7.1. The experimental data yielded excellent fits within the following isotherm order: Redlich-Peterson>Toth>Sips>Koble-Corrigan>Langmuir>Temkin>Dubinin-Radushkevich>Freundlich, based on its correlation coefficient values. Three simplified kinetic models including a pseudofirst-order, pseudo-second-order and intraparticle diffusion equations were selected to follow the adsorption process. It was shown that the adsorption of methylene blue could be described by the pseudo-second-order equation. The results indicate that cashew nut shell activated carbon could be employed as a low cost alternative to commercial activated carbon in the removal of dyes from wastewater.

Removal of Methylene Blue of Textile Industry Waste with Activated Carbon using Adsorption Method

Reaktor

The colorant that is often used in the textile industry is methylene blue which is a cationic heterocyclic aromatic compound. This compound is very stable and is difficult to decompose naturally leading to environment in large concentrations. Therefore, a waste treatment technology to reduce the concentration of dye waste in water becomes importannt. So far, adsorption method with activated carbon remains the most efficient and effective technique in removing dyes from liquid waste due to its relatively large adsorption capacity. Activated carbon is one of the non-metallic mineral commodities or multipurpose industrial minerals, one of which is as an adsorbent or adsorbent media. This study aims to determine the potential of activated carbon in adsorbing methylene blue with variations in the concentration of methylene blue and particle size of activated carbon. The procedures in this experiment include, the preparation of activated carbon with size variations (20-60, 60-100 and> ...

Role of activated carbon from natural adsorbent for removal of textile dyes: effect of pH, kinetic and adsorbent mass

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.

Adsorption of Direct Blue 5 Dye by Activated Carbon as Adsorbent -Modeling and Kinetics

2013

In this study, a study has been carried on adsorption of direct black dye which is used in textile industries of Sanganer (Jaipur). The amount adsorbed on granular activated carbon at equilibrium was measured and the equilibrium data were tested for Langmuir Frendlich, Temkin and Dubinin-Radushkevich isotherms for their applicability. The experimental data satisfied Langmuir, Freundlich and Temkin adsorption isotherm having correlation coefficients R 2 > 0.98. The maximum monolayer coverage from Langmuir isotherm was 17.51 mg/g. The heat of adsorption process was estimated from Temkin isotherm to be 3.796 J/mol. The calculations of thermodynamic parameters indicated that the adsorption is spontaneous and exothermic. The adsorption is found to increase with increase in temperature. The adsorption studies with granular activated carbon fit the second order kinetic model with R 2 = 0.9997.

Langmuir, Freundlich Adsorption Isotherms and Kinetics for the Removal of Methylene Blue Dye from Aqueous Solution using Activated Carbon Derived from Pods of Acacia nilotica var astringens (Sunt tree) by Chemical Activation with ZnCl2

Chemical and Process Engineering Research, 2015

Adsorption of Methylene Blue dye from aqueous solution onto Activated carbon derived from Acacia nilotica (Sunt tree) by chemical activation with ZnCl2, (SUNT-C2) has been studied using batch-adsorption techniques. This study was carried out to examine the adsorption capacity of the low-cost adsorbent (SUNT-C2) for the removal of Methylene Blue dye from aqueous solution. The influence of pH, initial dye concentration, adsorbent particle size, adsorbent dose and contact time on the adsorption process were also studied. Results revealed that adsorption rate initially increased rapidly, and the optimal removal efficiency was reached within about 100 mins. Further increase in contact time did not show significant change in equilibrium concentration; that is, the adsorption phase reached equilibrium. The adsorption isotherms could be fitted well by the Langmuir and Freundlich models. Also the adsorption process followed pseudo first order rate kinetics. Results indicate that, a new, en...

Adsorption of cationic dye from aqueous solutions by activated carbon

Microporous and Mesoporous Materials, 2008

In the study, montmorillonite was used as an adsorbent for the removal of methylene blue (MB) from aqueous solutions. Batch studies were performed to address various experimental parameters like contact time, pH, temperature, stirring speed, ionic strength, adsorbent dosage and initial concentration for the removal of this dye. Adsorption rate increased with the increase in initial dye concentration, ionic strength, stirring speed, pH and temperature. Kinetic study showed that the adsorption of dye on montmorillonite was a gradual process. Quasi-equilibrium reached in 3 h. Pseudo-first-order, pseudo-second-order, Elovich, Bangham, mass transfer and intra-particle particle diffusion models were used to fit the experimental data. Pseudo-second-order rate equation was able to provide realistic description of adsorption kinetics. Intra-particle diffusion process was identified as the main mechanism controlling the rate of the dye sorption. The diffusion coefficient, D, was found to increase when the stirring speed, ionic strength and temperature were raised. Thermodynamic activation parameters such as ∆G * , ∆S * and ∆H * were also calculated.

Adsorption studies on the treatment of textile dyeing effluent by activated carbon prepared from olive stone by ZnCl2 activation

Coloration Technology, 2007

This study aimed to investigate the removal of a reactive dye from aqueous solution by adsorption. Activated carbon prepared from olive stone, an agricultural solid by-product, was used as adsorbent. Different amounts of activating agent (ZnCl 2 ) and adsorbent particle size were studied to optimise adsorbent surface area. The adsorption experiments were conducted at different process parameters such as adsorbent dose, temperature, equilibrium time and pH. The experimental results showed that at equilibrium time 120 min, optimum pH ranged between 3 and 4, and adsorbent dosage was 2.0 g 200 ml )1 . While the kinetic data support pseudo-second order, a pseudo-first order model shows very poor fit. Adsorption isotherms were obtained at three different temperatures (288, 298 and 308 K). The fitness of adsorption data to the Langmuir and Freundlich isotherms was investigated. In addition, the thermodynamic parameters such as isosteric enthalpy of adsorption (DH ads ) y , isosteric entropy of adsorption (DS ads ) y and free energy of adsorption DG 0 ads were calculated. BET surface area measurements were made to reveal the adsorptive characteristics of the produced active carbon. The surface area of the activated carbon produced with 20% w/w ZnCl 2 solution was 790.25 m 2 g )1 .

IJERT-Adsorption of Direct Blue 5 Dye by Activated Carbon as Adsorbent -Modeling and Kinetics

International Journal of Engineering Research and Technology (IJERT), 2013

https://www.ijert.org/adsorption-of-direct-blue-5-dye-by-activated-carbon-as-adsorbent-modeling-and-kinetics https://www.ijert.org/research/adsorption-of-direct-blue-5-dye-by-activated-carbon-as-adsorbent-modeling-and-kinetics-IJERTV2IS120891.pdf "Abstract" In this study, a study has been carried on adsorption of direct black dye which is used in textile industries of Sanganer (Jaipur). The amount adsorbed on granular activated carbon at equilibrium was measured and the equilibrium data were tested for Langmuir Frendlich, Temkin and Dubinin-Radushkevich isotherms for their applicability. The experimental data satisfied Langmuir, Freundlich and Temkin adsorption isotherm having correlation coefficients R 2 > 0.98. The maximum monolayer coverage from Langmuir isotherm was 17.51 mg/g. The heat of adsorption process was estimated from Temkin isotherm to be 3.796 J/mol. The calculations of thermodynamic parameters indicated that the adsorption is spontaneous and exothermic. The adsorption is found to increase with increase in temperature. The adsorption studies with granular activated carbon fit the second order kinetic model with R 2 = 0.9997.

Adsorption of congo red and methylene blue dyes on an ashitaba waste and a walnut shell-based activated carbon from aqueous solutions: Experiments, characterization and physical interpretations

Adsorption of congo red and methylene blue dyes on an ashitaba waste and a walnut shell-based activated carbon from aqueous solutions: Experiments, characterization and physical interpretations, 2020

Activated carbons were prepared from ashitaba waste and a walnut shell to study the adsorption mechanism of congo red and methylene blue dyes in aqueous solution. These adsorbents were characterized via XRD, FTIR and SEM techniques and the dye adsorption isotherms at three temperatures were quantified. A statistical physics model was applied to interpret the adsorption mechanism of tested dyes and adsorbents. Modeling results showed that these dyes were practically separated in the solution leading to an absence of the aggregation process. Adsorption orientations of dye molecules on the adsorbents changed depending on the temperature and nature of systems. The adsorption capacity of ashitaba waste activated carbon for the removal of congo red was significant thus indicating strong interactions between this dye and tested adsorbent. Calculated adsorption energy varied from 7.25 to 20.43 kJ/mol and they showed that the adsorption of both adsorbates occurred via physical interactions at different temperatures where the removal process was endothermic.

Factors Affecting the Removal of a Basic and an Azo Dye from Artificial Solutions by Adsorption Using Activated Carbon

Journal of the Turkish Chemical Society, Section A: Chemistry, 2014

Decolourisation of wastewater, particularly from textile industries, is one of the major environmental concerns these days. Current methods for removing dyes from wastewater are costly and cannot effectively be used to treat wide range of such wastewater. This work describes the use of commercially available granular activated carbon (GAC) as an efficient adsorbent material for dyes' removal. Aqueous solutions of various concentrations of the basic dye Methylene Blue (MB) and the azo-dye Tartrazine at 5-20 mg.L-1 and 10-100 mg.L-1 , respectively, were shaken with certain amount of GAC to determine the adsorption capacity and removal efficiencies. The effects of adsorbent dose, initial pH, initial dye concentration, agitation speed, and contact time on dyes' removal efficiencies have been studied. Maximum dye concentration was removed from the solution within 60-90 min. after the beginning of every experiment. Adsorption parameters were found to fit well into Langmuir and Freundlich adsorption isotherm models with correlation coefficient (R 2 > 0.99) in the concentration range of MB and TZ studied.