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In the present study, effect of acidic and basic pre-treatment of wild algal biomass for their hexavalent chromium removal capacity was investigated. Wild algal biomass was subjected to chemical pretreatments with acid (perchloric acid with formaldehyde in 1:1 ratio (PF)), base (0.5 N NaOH), and only distilled water washed (DW). Batch experiments were conducted to determine the adsorption properties of pretreated wild algal biomass. It was observed that biomass was capable of removal of Cr (VI) metal ions from aqueous solution. The removal percentage was significantly depends on contact time, equilibrium pH, initial metal concentration and biosorbent load. Removal equilibrium was attained in less than 2 hours. Optimum pH for Cr(VI) was found to be 2 pH, and optimum algal dose was 10g/L. It was also observed that removal percentage was increased after acidic pre-treatment of wild algal biomass. In contrast, it was decreased significantly after basic pre-treatment. The order of maximum metal uptakes for Cr (VI) was PF>DW>NaOH. The sorption data of DW obtained at pH 2.0 conformed well fitted in both Langmuir and Freundlich isotherm models (R 2 > 0.99). The study concluded that the algal biomass pre-treated with perchloric acid and

Effect of acidic and basic pretreatment of wild algal biomass on Cr (VI) biosorption