LAUSR

BACKGROUND Nanoscale tapioca starch (NTS) was successfully developed by high speed jet in our previous study. In this study, the adsorption capacity of Cu2+ onto NTS was further discussed. The optimal adsorption conditions ( pH, contact time, contact temperature, Initial Cu2+ concentration, and adsorbent concentration), adsorption kinetics, isotherms and thermodynamic were also evaluated. RESULTS The results showed that NTS exhibited excellent performance in adsorption of Cu2+ , with adsorption capacities of 122.31 mg/g for Cu2+ (pH 7, 0.04 g/L, 0.2 g/L, 313.15 K and 10 min). The pseudo-second-order and Langmuir isotherms models could be used to explain the adsorption kinetics and adsorption equilibrium, respectively. Thermodynamics results displayed that adsorption process was spontaneous, endothermic with a increase in entropy. Cu2+ was adsorbed onto NTS which was confirmed by Energy dispersive spectrometry analysis. CONCLUSION These findings indicated that NTS might be an effective, environment-friendly and renewable bio-resource adsorbent for removing heavy metals in industrial effluent. This article is protected by copyright. All rights reserved.