CAJ | 학술논문

研究了纳米γ-Al_2O_3吸附剂对Ge(Ⅳ)的吸附行为, 考察了吸附平衡时间、温度和溶液的pH值等因素对吸附过程的影响. 结果表明, 纳米Al_2O_3对Ge(Ⅳ)的吸附在2 min时基本达到平衡, 在pH=4～11范围内, Ge(Ⅳ)可以被纳米Al_2O_3定量富集, 吸附率大于95%;吸附于纳米Al_2O_3上的Ge(Ⅳ)可以用 0.3 mol/L K_3PO_4和1 mol/L H_2SO_4混合溶液洗脱, 5 min后基本达到解析平衡, 解析率能达到97%;该吸附过程符合准二级反应动力学模型, 计算了不同温度下的吸附速率常数, 并求得纳米Al_2O_3对Ge(Ⅳ)的吸附活化能(E_a)为11.63 kJ/mol;该体系的吸附过程符合Freundlich等温式, 由D-R等温式求得常温下纳米Al_2O_3对Ge(Ⅳ)的平均吸附能为10.87 kJ/mol. Ge(Ⅳ)吸附反应的ΔG~0为负值, 焓变ΔH~0为正值, 说明该吸附过程是自发的吸热反应.
연구료납미γ-Al_2O_3흡부제대Ge(Ⅳ)적흡부행위, 고찰료흡부평형시간、온도화용액적pH치등인소대흡부과정적영향. 결과표명, 납미Al_2O_3대Ge(Ⅳ)적흡부재2 min시기본체도평형, 재pH=4～11범위내, Ge(Ⅳ)가이피납미Al_2O_3정량부집, 흡부솔대우95%;흡부우납미Al_2O_3상적Ge(Ⅳ)가이용 0.3 mol/L K_3PO_4화1 mol/L H_2SO_4혼합용액세탈, 5 min후기본체도해석평형, 해석솔능체도97%;해흡부과정부합준이급반응동역학모형, 계산료불동온도하적흡부속솔상수, 병구득납미Al_2O_3대Ge(Ⅳ)적흡부활화능(E_a)위11.63 kJ/mol;해체계적흡부과정부합Freundlich등온식, 유D-R등온식구득상온하납미Al_2O_3대Ge(Ⅳ)적평균흡부능위10.87 kJ/mol. Ge(Ⅳ)흡부반응적ΔG~0위부치, 함변ΔH~0위정치, 설명해흡부과정시자발적흡열반응.
The effects of various equilibrium time, temperature and pH on the adsorption of Ge(Ⅳ) on nano-Al_2O_3 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-Al_2O_3 can be eluted with 0.3 mol/L K_3PO_4-1 mol/L H_2SO_4 mixed solution within 5 min, the desorption percentage can reach 97%. The sorption of Ge(Ⅳ) ions onto nano-Al_2 O_3 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-Al_2 O_3 is a chemical adsorption. The ΔG~0 and ΔH~0 values is negative and positive respectively which indicate the adsorption of Ge(Ⅳ) on nano-Al_2O_3 is spontaneous and endothermic.