Inderscience Publishers

Efficacy of various biosorbents for removal of endosulfan from water environment

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In this study, the efficacy of biosorbents prepared from various cultures for removal of endosulfan from water environment was evaluated. Seven different biosorbents from
Bacillus subtilis, Bacillus megaterium, Escherichia coli, Rhizopus arrihzus, Aspergillus nidulans, Cladosporium
and activated sludge biomass were synthesised and assessed for biosorption of endosulfan from water environment. Biosorption experiments were conducted for each biosorbent with 1 mg/l endosulfan solution at 250 rpm for three days at biosorbent doses ranging 2.5–50 mg. Saturation capacity of the biosorbent was taken as the key parameter for selecting the most suitable biosorbent for further research. The isotherms were developed for all biosorbents and linear regression analysis was carried out with BET, Freundlich and Langmuir adsorption equilibrium models to determine the saturation capacities. The biosorbent prepared from fungal strain
Aspergillus nidulans
was found to be most appropriate as it exhibited the maximum saturation capacity of 43.6 mg/g of endosulfan among all biosorbents.

Keywords: BET, biosorption, endosulfan, Freundlich, Langmuir

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