Abstract
The present study investigated the efficiency of the biosorbent developed from waste biomass of Sapindus mukorossi (reetha) pericarp for removal of methyl violet dye from wastewater. The saponin extracted waste biomass of reetha pericarp was developed as biosorbent by different techniques such as, chemical treatment (H2SO4 treated), physical modification (thermally treated) and combining them both. The developed biosorbent was characterized by BET, FTIR, FE-SEM and EDX analysis. The DTG analysis of reetha bio-waste reviled that hemicellulose (27%), cellulose (45%), and lignin (10%) were present in the saponin extracted reetha bio-waste (RBW). In the preliminary adsorption experiments, the thermally treated biosorbent (RBW-III) showed maximum MV removal efficiency among the developed biosorbents. The adsorption experiments were designed using central composite design (CCD) technique to optimize the process parameters such as pH, biosorbent dosage, initial MV concentration and agitation speed for thermally treated biosorbent (RBW-III). The adsorption kinetics, isotherms parameters were evaluated for thermally treated biosorbent (RBW-III). The RBW-III removed maximum 95% MV dye from 28 mg L−1 initial MV concentration at pH of 4 using biosorbent dose of 0.1 g L−1, with an agitation speed of 120 rpm and contact time of 150 min.
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