A highly efficient nanoscale tapioca starch prepared by high‐speed jet for Cu2+ removal in simulated industrial effluent

Abstract BACKGROUND Nanoscale tapioca starch (NTS) was successfully developed by high‐speed jet in our previous study. In this study, the adsorption capacity of Cu 2+ onto NTS was further discussed. The optimal adsorption conditions (pH, contact time, contact temperature, initial Cu 2+ concentration, and adsorbent concentration), adsorption kinetics, isotherms, and thermodynamic were also evaluated. RESULTS The results showed that NTS exhibited excellent performance in adsorption of Cu 2+ , with adsorption capacities of 122.31 mg g −1 for Cu 2+ (pH 7, 0.04 g L −1 , 0.2 g L −1 , 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. The thermodynamic results showed that the adsorption process was spontaneous and endothermic with an increase in entropy. Cu 2+ 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. © 2021 Society of Chemical Industry