Adsorption Technology and Mechanism of Cu and CN⁻ From Cyanide Waste Water on Modified Peanut Shell

Abstract

Modified peanut shell (MPS) was prepared from peanut hull by chemical activation with H₃PO₄ and carbonized, which was characterized by micrometrics ASAP-20, SEM, and EDS. Adsorption of Cu and CN⁻ on MPS was investigated as a function of pH, adsorbent dosage, temperature and time. The Langmuir and Freundlich models were used to simulate the adsorption isotherms of Cu at different temperature. The thermodynamic date were calculated, the results suggest that adsorption process of Cu on MPS was spontaneous and endothermic. Pseudo second-order kinetic model fits the experimental curves of Cu well and adsorption curve of CN⁻ fits the pseudo first-order kinetic model.

Keywords:

• modified peanut shell
• cyanide waste water
• adsorption
• thermodynamic
• kinetic model

Funding

This study was in part financially supported by National Natural Science Foundation of China (51304129), Shandong Province National Natural Science Foundation (ZR2-013EEM005), China, and High Education Science Technology Program of Shandong Province (J12LA04).