Biosorbent Prepared from Calotropis Gigantean Stems for Adsorption of Cu(II) Ions from Aqueous Solution

Calotropis gigantea stems (CGS) has the potential to use as biosorbent for adsorption of Cu(II) ions. In this study, CGS (CGSB) was prepared by drying and grounding. The effect independent variables on capacity were investigated. As result, maximum 53.457 mg/g obtained optimal condition which initial ions concentration 567.47 mg/L, CGSB size less than 230 mesh, mass 1 g, temperature 27 oC, pH 5, contact time 60 min. surface morphology analysed using SEM. fitted well with pseudo first-order kinetic (PFO-AK) model (R2=0.99), PFO-AK rate constant 70.194 0.0877 g/mg.min, respectively. isotherm in accordance Freundlich intensity volume constants attained 0.876 1.017 L/mg, This result showed that physical occurred dominantly chemical adsorption. application wastewater 389.31 mg/L from ex-mine pool acid mine drainage (AMD) Jantang village, Lhoong District, Aceh Besar, Province resulted 37.52 efficiency 66.13%.