## Abstract Adsorption studies show that chromium hydroxide precipitates can be used for the removal of methylene blue, reactive blue, congo red and disperse orange dyes from aqueous media. Three different mechanisms are involved: attraction of positive surface charges on the precipitate at low pH
The use of toxic solid waste for the adsorption of dyes from waste streams
✍ Scribed by Subramani Saravanabhavan; Kalarical Janardhanan Sreeram; Jonnalagadda Raghava Rao; Balachandran Unni Nair
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2007
- Tongue
- English
- Weight
- 169 KB
- Volume
- 82
- Category
- Article
- ISSN
- 0268-2575
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✦ Synopsis
Abstract
The use of chromium‐containing toxic solid wastes from the leather industry for the removal of dyes from waste‐waters has been studied. A batch adsorption model has been employed and the role of various experimental parameters on the efficiency of the process evaluated. The extent of dye removal was studied by varying parameters such as pH, contact time, initial concentration of the dye and amount of adsorbent. The experimental equilibrium data for this system has been analyzed using the linearized forms of Langmuir and Freundlich isotherms. The Langmuir isotherm was found to provide the best theoretical correlation of the experimental data and the adsorption was found to follow pseudo‐second‐order kinetics. The dye adsorbed solid wastes were used for the preparation of pigments. In essence, this study provides a greener solution for chromium‐containing solid wastes, dye containing waste‐waters and dye‐adsorbed chromium solid wastes. Copyright © 2007 Society of Chemical Industry
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## Abstract **BACKGROUND:** Solid waste emanating from tanneries contains a high percentage of protein with raw trimmings from hides constituting a significant percentage of the solid waste. In this study, organically stabilized trimmings (OST) have been used as an adsorbent material for removal of