Adsorption Behavior and Mechanism of Nano-Al2O3 for Ge(IV)

作者：Zhang Lei^*; Li Hong Mei; Han Guang Xi; Kang Ping Li

来源：Chemical Journal of Chinese Universities, 2010, 31(1): 135-140.

• Ge(IV)
• Nano-gamma-Al2O3
• Adsorption
• Kinetics
• Thermodynamic

The effects of various equilibrium time, temperature and pH on the adsorption of Ge(IV) on nano-Al2O3 were studied. The results show that the adsorption is fast to reach equilibrium within 2 min. It was found that the adsorption efficiency of Ge (IV) was more than 95% with pH from 4 to 11. Almost all of Ge (IV) ions adsorpted onto nano-Al2O3 can be eluted with 0.3 mol/L K-3 PO4-1 mol/L H2SO4 mixed solution within 5 min, the desorption percentage can reach 97%. The sorption of Ge (IV) ions onto nano-Al2O3 followed the second-order rate equation, the kinetic experimental data properly correlate with the second-order kinetic model and the values of activation energy(E-a) was 11.63 kj/mol. The adsorption data are fitted to the Freundlich and the magnitude of sorption energy computed from D-R equation is 10.87 kJ/mol, thus, the type of the adsorption of germanium on nano-Al2O3 is a chemical adsorption. The Delta G(0) and Delta H-0 values is negative and positive respectively which indicate the adsorption of Ge (IV) on nano-Al2O3 is spontaneous and endother-mic.

• 出版日期2010-1-10
• 单位辽宁大学