松树锯末对Pb(Ⅱ)与Ni(Ⅱ)的吸附研究  

Adsorption of Pb( Ⅱ) and Ni( Ⅱ) by pine sawdust

作　　者：余美琼[1] 杨金杯[1] 陈秀宇[1] 邓殳[1] 

机构地区：[1]福建师范大学福清分校海洋与生化工程学院,福建福州350300

出　　处：《山东大学学报（工学版）》2015年第2期75-81,共7页Journal of Shandong University（Engineering Science）

基　　金：福建省教育厅科研资助项目(JA12355;JA14338;JB12262);福建师范大学福清分校科研创新基金资助项目(KY2012001)

摘　　要：以松树锯末为吸附剂,研究其对水中Pb(Ⅱ)和Ni(Ⅱ)的吸附性能,研究了锯末用量、搅拌速度、溶液初始p H值等对吸附效果的影响及其吸附动力学和热力学性能。研究结果表明,锯末对Pb(Ⅱ)和Ni(Ⅱ)具有良好的吸附能力。锯末对Pb(Ⅱ)和Ni(Ⅱ)吸附过程均符合拟二级吸附动力学模型(R2≥0.997 7),锯末吸附Pb(Ⅱ)和Ni(Ⅱ)的活化能分别为9.808 7 k J/mol和2.859 4 k J/mol;锯末对Pb(Ⅱ)和Ni(Ⅱ)等温吸附符合Langmuir模型(R2≥0.999 2)。热力学研究表明,锯末对Pb(Ⅱ)和Ni(Ⅱ)的吸附是自发的放热过程。Sawdust was used to remove Pb（Ⅱ） and Ni（Ⅱ） from water as an absorbent. Effects of sawdust dosage, stir- ring speed and pH on the adsorption capacity, adsorption kinetics and thermodynamics were discussed. The results showed that sawdust had a good adsorption capacity for Pb（Ⅱ） and Ni（Ⅱ）. The adsorption process corresponded with pseudo-second-order kinetic model （R^2 ≥0. 997 7）, the activation energy were 9. 808 7 kJ/mol for Pb（Ⅱ） and 2. 859 4 kJ/mol for Ni（ n）, respectively. The adsorption isotherms of Pb（Ⅱ） and Ni（Ⅱ） were consistent well with the Lang- muir isotherm （R2≥10. 999 2）. Thermodynamics analysis showed that the adsorption process was spontaneous and exo- thermic.

关 键 词：锯末 Pb(Ⅱ) Ni(Ⅱ) 吸附 动力学 热力学 

分 类 号：X703.1[环境科学与工程—环境工程] TQ536.4[化学工程—煤化学工程]