双硫腙包覆氧化锌粉体对Pb(Ⅱ)的吸附性能  

Pb(Ⅱ)Adsorption Capability of ZnO Powder Coated with Dithizone

作　　者：常亮亮 于艳 张梦萌 康月 张娜 弥明言 徐珊 CHANG Liangliang;YU Yan;ZHANG Mengmeng;KANG Yue;ZHANG Na;MI Mingyan;XU Shan(Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources,Shangluo University,Shangluo 726000,China;East China University of Technology,Nanchang 330000,China)

机构地区：[1]陕西省尾矿资源综合利用重点实验室/商洛学院化学工程与现代材料学院,陕西商洛726000 [2]东华理工大学,江西南昌330000

出　　处：《材料科学与工程学报》2020年第4期609-614,共6页Journal of Materials Science and Engineering

基　　金：商洛市科学技术研究发展计划资助项目(SK2018-20);商洛学院自然科学基金资助项目(18SKY015,17SKY002)。

摘　　要：以化学沉淀法制备纳米氧化锌粉体,并用双硫腙对粉体进行包覆,得到新型吸附剂(双硫腙-ZnO),研究其对水中Pb(Ⅱ)的吸附行为。结果表明:双硫腙与ZnO表面羟基作用形成氢键实现包覆;在溶液pH=6,反应温度323 K时,吸附剂对Pb(Ⅱ)的吸附容量可达210 mg/g;吸附行为符合Langmiur等温吸附方程和准二级动力学模型;吸附过程的ΔH 0为46.14 kJ/mol,ΔG 0为负值,Ea为9.798 kJ/mol,说明该吸附过程是自发的、吸热的物理吸附过程;被吸附在双硫腙-ZnO上的Pb(Ⅱ),可用3.5 mol/L的盐酸洗脱。Nano zinc oxide(ZnO)powder was prepared by chemical precipitation method and was coated by dithizone gaining a new sort of adsorbent(Dithizone-ZnO).Capability of its Pb(Ⅱ)adsorption in water was studied.The results indicate that the powder was coated by the dithizone through hydrogen bonding between the hydroxyl groups on the surface of the ZnO and dithizone.The highest adsorption equilibrium for Pb(Ⅱ)was 210 mg/g at pH of 6 and reaction temperature of 323 K.The adsorption behavior follows a Langmuir adsorption equation and a quasi second-order kinetics model.The enthalpy of adsorption(ΔH)was 46.14 kJ/mol,Gibbs free energy of adsorption was negative,and the activation energy(Ea)was 9.798 kJ/mol for the adsorption,which show that the adsorption is spontaneous endothermic process.Pb(Ⅱ)adsorbed on Dithizone-ZnO could be completely eluated using 3.5 mol/L HCl.

关 键 词：双硫腙 包覆 纳米氧化锌 吸附 Pb(Ⅱ) 

分 类 号：X703.5[环境科学与工程—环境工程]