Dye adsorption by calcium chloride treated beech sawdust in batch and fixed-bed systems.
ABSTRACT Batch and column kinetics of methylene blue and red basic 22 adsorption on CaCl(2) treated beech sawdust was investigated, using untreated beech sawdust as control, in order to explore its potential use as a low-cost adsorbent for wastewater dye removal. The adsorption capacity, estimated according to Freundlich's model, and the adsorption capacity coefficient values, determined using the Bohart and Adams' bed depth service model indicate that CaCl(2) treatment enhanced the adsorption properties of the original material.
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ABSTRACT: The investigation of possible use of Alginate/ polyvinyl alcohol -kaolin composite instead of free kaolin in the removal of methylene blue from aqueous solutions was studied. Various experiments have been carried out using batch adsorption technique to study the effects of the process variables, which include contact time, beads diameter, beads swelling, organic-kaolin composite dosage, initial dye concentration, pH, agitation speed and solution temperature on the adsorption process. In the batch kinetic study of methylene blue, the order of the reaction, the half-life and the rate constant were determined. Numerical correlations using regression analysis for maximum percentage removal of dye with operating condition of the process were presented. The result showed that the adsorption attained to equilibrium in 360 min and the kinetics followed first order in nature. [Journal of American Science 2010; 6(5):280-292]. (ISSN: 1545-1003).Journal of American Science. 12/2010; 6(5):280-292.
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ABSTRACT: The application of raw Bangalora (Totapuri) mango seed kernel powder (RMS) and surface-modified Bangalora (Totapuri) mango seed kernel powder (SMMS) for the removal of methylene blue (MB) dye from aqueous solution was investigated under ambient conditions. The adsorbent was characterized by the FTIR and SEM analyses. Batch adsorption studies were conducted by varying the solution pH, adsorbent dose, initial MB dye concentration, and contact time. The optimum conditions for the adsorption of MB dye onto the adsorbent was found to be: pH (8.0), adsorbent dose (1.0 g: RMS and 0.4 g: SMMS), contact time (60 min: RMS and 30 min: SMMS), temperature of 30°C for an initial MB dye concentration of 100 mg/L. Adsorption isotherm data were analyzed by the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm models. Experimental data was successfully applied to the Freundlich model than the Langmuir model, and the maximum monolayer adsorption capacity was found to be greater for SMMS than the RMS. Adsorption kinetics was tested with the pseudo-first-order and pseudo-second-order kinetic models. The kinetic results show that the adsorption process followed the pseudo-second-order kinetic model. Adsorption kinetic data were further applied to the intraparticle diffusion, Boyd kinetic and shrinking core models to explain the adsorption mechanism. Adsorption mechanism results shows that the adsorption process was controlled by both internal and external diffusion. The results of this study show that the SMMS could be used as an effective and low-cost adsorbent for the removal of dyes from aqueous solution. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 87–98, 2014Environmental Progress & Sustainable Energy 04/2014; 33(1). · 0.87 Impact Factor
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ABSTRACT: Agricultural wastes products are quite commonly distributed as the result of agricultural practices. They are inexpensive and subject to biodegradable. Agricultural waste is a good source for the adsorption of the dyes generated during the textile processing. For the process of adsorption, agricultural waste products are used as natural or in the modified form through activation process. This review article focuses on the various sources of the agricultural waste products and its adsorption capacity of the different dyes. Signifying the potential of the use of agricultural wastes products for removing off the toxic dye substances from the effluent discharging into the water bodies.Journal of Environmental Chemical Engineering 12/2013; 1(4):629–641.