Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 90, Issue 5, Pages 1877-1883Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2008.12.005
Keywords
Phenol; Biosorption; Equilibrium isotherm; Green macro alga; Macro algae; Thermodynamic studies
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Funding
- Council of Scientific and Industrial Research, Govt. of India, New Delhi
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Phenol and substituted phenols are toxic organic pollutants present in tannery waste streams. Environmental legislation defines the maximum discharge limit to be 5-50 ppm of total phenols in sewers. Thus the efforts to develop new efficient methods to remove phenolic compounds from wastewater are of primary concern. The present work aims at the use of a modified green macro alga (Caulerpa scalpelliformis) as a biosorbent for the removal of phenolic compounds from the post-tanning sectional stream. The effects of initial phenol concentration, contact time, temperature and initial pH of the solution on the biosorption potential of macro algal biomass have been investigated. Biosorption of phenol by modified green macro algae is best described by the Langmuir adsorption isotherm model. Biosorption kinetics of phenol onto modified green macro algal biomass were best described by a pseudo second order model. The maximum uptake capacity was found to be 20 mg of phenol per gram of green macro algae. A Boyd plot confirmed the external mass transfer as the slowest step involved in the biosorption process. The average effective diffusion coefficient was found to be 1.44 x 10(-9) cm(2)/s. Thermodynamic studies confirmed the biosorption process to be exothermic. (C) 2008 Elsevier Ltd. All rights reserved.
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