Abstract
Biomass of Java plum (JP) and amaltash (AT) seeds were employed to remove arsenic from synthetic wastewater, cost effectively. The prepared biomasses were characterized by FE-SEM, EDX, FTIR, XRD, and ICP techniques. Experimentation the optimization study has been carried out by using Design-software 6.0.8. Response surface methodology has been applied to design the experiments where we have used three factors and three levels Box-Behnken design (BBD). Arsenic removal ability of bio-sorbents was evaluated and optimized by varying pH, adsorbent dose concentration of arsenic in synthetic wastewater. For 2.5 mg/L arsenic concentration and 80 mg adsorbent dose at pH 8.8 Java plum seeds (JP) based bio-adsorbent removed similar to 93% and amaltash seeds (AT) based bio-adsorbent removed similar to 91% arsenic from synthetic wastewater. The adsorption behaviour better explained following Freundlich model (R-2 = 0.99) compared to Temkin model (R-2 = 0.986) for As (III) ions. The adsorption capacity was 1.45 mg g(-1) and 1.42 mg g(-1) for JP and AT, respectively after 80 min under optimal set of condition. The adsorption kinetics was explained by either pseudo-first order model or Elovich model. (C) 2021 Elsevier Ltd. All rights reserved.