Adsorption of gold from cyanide leaching solution onto activated carbon originating from coconut shell—Optimization, kinetics and equilibrium studies

摘要: Abstract This study investigates the behavior of gold adsorption from cyanide leaching solution onto activated coconut shell carbon. The experimental was designed according to CCD implemented with RSM and a quadratic model developed for regression analysis. effects important parameters including pH, agitation rate, adsorbent concentration time were studied find best operating conditions, optimized value carbon found be 11, 40 rpm, 1.25 g/L 3 h, respectively. Under these rate about 87.11%. Also, optimal conditions established on industrial results demonstrated that could obtained 89.25%. Adsorption kinetically investigated using pseudo first-order second-order models among which data mostly correlated model. further analysis kinetics indicated intra-particle diffusion rate-limiting step. Adsorbate–adsorbent interactions at 298 k assessed by Langmuir, Freundlich, Temkin isotherm Freundlich had highest consistency data.