Title: Optimisation and kinetics of biosorption of Coomassie Brilliant Blue G250 dye from synthetic effluent using Pennisetum purpureum biosorbent

Authors: G. Baskar; C. Sriharini; R. Sripriya; S.K. Pavithra

Addresses: Department of Biotechnology, St. Joseph's College of Engineering, Chennai - 600 119, India ' Department of Biotechnology, St. Joseph's College of Engineering, Chennai - 600 119, India ' Department of Biotechnology, St. Joseph's College of Engineering, Chennai - 600 119, India ' Department of Biotechnology, St. Joseph's College of Engineering, Chennai - 600 119, India

Abstract: Water-soluble reactive acid dyes are most problematic and susceptible to oxidative catabolism. Hence, their removal is of great importance and necessitates cost effective, environmentally sound techniques for the treatment of waste water containing dyes and metal. In the present study, the effect of the biosorbent dosage, pH, agitation rate, temperature and time was studied and their optimum values were found as 1 g/l, 2, 160 rpm, 30°C and 140 minutes, respectively. It was found that the Pennisetum purpureum biomass acts as a potential biosorbent to remove an industrial dye Comassie Brilliant Blue G250. The kinetics of the biosorption of Comassie Brilliant Blue G250 dye by Pennisetum purpureum adsorbent was studied at optimal conditions and Pseudo-second order model was found to be best described in this adsorption kinetics. The mechanism and the potential rate controlling step on biosorption have been investigated and were found to follow external diffusion model.

Keywords: biosorption; external diffusion; isotherms; adsorption kinetics; optimisation; wastewater treatment; dye removal; synthetic effluent; Pennisetum purpureum biosorbents; water-soluble reactive acid dyes; industrial dyes; kinetic modelling.

DOI: 10.1504/IJESD.2016.077368

International Journal of Environment and Sustainable Development, 2016 Vol.15 No.3, pp.241 - 253

Available online: 29 Jun 2016 *

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