Journal of Environmental Biology

Biosorption of chromium(VI) onto NaOH activated

Codium tomentosum biomass

Suresh Babu Palanisamy^1,2 and Anandaraj Balaiah¹*

¹Department of Biotechnology, Anna University Chennai, BIT Campus, Tiruchirappalli-620 024, India

²Department of Biotechnology, Sree Sastha Institute of Engineering and Technology, Chennai-600 123, India

*Corresponding Author E-mail: dranandaraj74@gmail.com

Publication Data

Paper received:

27 March 2014

Revised received:

24 November 2014

Accepted:

20 March 2015

Abstract

Batch experiments were conducted to examine the efficacy of NaOH activated Codium tomentosum biomass on the sorption of hexavalent chromium. Several influencing parameters like pH, contact time, dosage and initial chromium (VI) concentration was experimented at 20˚C. The monolayer sorption capacity was found to be 5.504?0.360 mg g^-1. Langmuir and Freundlich isotherm implied favorable condition of chromium (VI) biosorption, based on R2 values. Dubinin-Radushkevich isotherm showed the best fit linearity and infered that adsorption energy as 4.888?0.129 kJ mol^-1. Pseudo-second order kinetics showed good compliance for the entire data and the rate constant (k₂) was found to be 0.0398?0.007 g mg^-1 min. Elovich kinetics exhibited that adsorption occurs on heterogeneous surface. Intraparticle diffusion model specified multi-linearity in adsorption process. Hence, the employed biosorbent was sensible and sorption efficiency was remarkable. ?????  

 Key words

Biosorption, Chromium, Codium tomentosum, Cooperative adsorption, Sigmoidal curve 

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