Suitability of non-conventional adsorbents for the discolouration of textile dyes from their aqueous solutions
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Date
2005-06
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Effect of various non-conventional adsorbents (bagasse, rice husk and wood ash) were studied on different concentrations of three dye solutions for the changes in colour and pH, at varying time periods (1, 2, 3, 4 and 5 hours). Discolouration of dye solutions increased with increasing dye concentration upto 40ppm, by treatment with various adsorbents. The discolouration also increased with the increase of time up to 4 hours. However, the rate of colour removal was highest in first hour of treatment. Effects of different amounts (0.25, 0.5 and 1.0 gm/50 ml dye solution) of various adsorbents on changes in colour and pH of three dye solutions were investigated. Discolouration considerably increased when adsorbents were employed up to the amount of 0.5 g; afterwards colour removal was negligible. Effects of adsorbents (bagasse, rice husk and wood ash) singly and in combinations on pH, colour and COD of the dye solutions were studied. In all 3 dyes, there was an increase in pH when adsorbents singly and combination were employed, the increase was maximum in Malachite green. The colour reduction was slightly higher in combinations than adsorbents when employed singly. Effect of adsorbents (bagasse, rice husk and wood ash) singly and in combinations led to maximum COD reduction in Crystal violet solutions and minimum in Congo red solutions.
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