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.
"Several research works has been performed to search for efficient and low-cost materials to remove methylene blue and other basic dyes from aqueous solution, including rice husk (Vadivelan and Kumar, 2005) beech sawdust (Batzias and Sidiras, 2004), agro-industry wastes (Garg et al., 2004) and activated carbon from date pits (Abdulkarim et al, 2002). However, as the adsorption capacities of the above adsorbents are not large, new absorbents are still under development. "
[Show abstract][Hide abstract] ABSTRACT: In the present study, agricultural waste coffee husk were used for the adsorption of the dye fast green. The operating variables studied were initial concentration, initial solution pH, adsorbent dosage and contact time. Experimental equilibrium data were fitted to Freundlich and Langmuir isotherms. The kinetics of fast green onto coffee husk was found to follow a pseudo first order kinetics. The maximum adsorption of fast green was mg/g of the adsorbent respectively. The Fourier transformed infrared spectroscopy reveals that –OH, C=O and CO groups are involved in the adsorption process. The optimum pH for the adsorption of fast green was 2. Characterization of the coffee husk shells showed that the relative percentage of protein is very less making it an excellent adsorbent for the removal of dyes from wastewater effluents.
[Show abstract][Hide abstract] 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. DOI:10.1016/j.jece.2013.07.014
"In this contest, adsorption of dyes from direct SDM and RTE has significant importance because the effluent present in environment contains complex mixture of dyes (Kadam et al., 2012). Pretreatment of SCB using 20% CaCl 2 as per the method reported by Batzias and Sidiras (2004) showed 84% adsorption of SR5B. While, 0.2% CaCl 2 pretreatment showed 91% adsorption. "
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