维生素B_(12)改性纳米零价镍去除溶液中U(Ⅵ)的机理  

Removal Mechanism of U(Ⅵ)from Solution by VB_(12)Modified Nano Zero-valent Nickel

作　　者：付晓辉 李冠超 王昱莹 李小燕[1] 黄希 刘小亮 胡伟芳 FU Xiaohui;LI Guanchao;WANG Yuying;LI Xiaoyan(HUANG Xi 1,LIU Xiaoliang 1,HU Weifang 11 State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;Radiation Environment Monitoring Center of Guangdong Geological Bureau of Nuclear Industry,Guangzhou 510800,China)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,南昌330013 [2]广东省核工业地质局辐射环境监测中心,广州510800

出　　处：《材料导报》2024年第4期45-50,共6页Materials Reports

基　　金：国家自然科学基金(11465002,41760190)。

摘　　要：采用液相还原法制备了维生素B_(12)改性的纳米零价镍(VB_(12)@nZVNi),运用SEM-EDS、Zeta、XPS对材料进行表征,研究其形貌特征,并对VB_(12)@nZVNi去除U(Ⅵ)的机理进行等温吸附、动力学与热力学研究。动力学研究结果表明,VB_(12)@nZVNi对U(Ⅵ)的去除包括吸附和还原两种方式,其吸附过程很好地符合准二级吸附动力学模型和Langmuir等温吸附模型,理论最大吸附容量高达670.6 mg/g。热力学研究结果表明,该反应是自发进行的吸热反应,吸附过程是物理吸附与化学吸附并存,为表面单层吸附且离子间没有相互作用。还原反应符合准一级还原动力学模型,维生素B_(12)中的Co可促进Ni^(0)对U(Ⅵ)的还原。VB_(12)@nZVNi材料的合成方法简便、环境友好、去除效果好,在含U(Ⅵ)废水处理中具有较好的应用前景。Vitamin B_(12)-modified nano zero-valent nickel(VB_(12)@nZVNi)was prepared by liquid phase reduction method.The morphology of VB_(12)@nZVNi was characterized by SEM-EDS,Zeta,and XPS.The removal mechanism of U(Ⅵ)by VB_(12)@nZVNi was studied with isotherm adsorption,kinetic fitting and thermodynamics.The kinetic study results showed that the removal of U(Ⅵ)by VB_(12)@nZVNi included adsorption and reduction,the adsorption process was in good agreement with the pseudo-second-order adsorption kinetic model and the Langmuir isotherm adsorption model,and the theoretical maximum adsorption capacity reached 670.6 mg/g.The results of thermodynamic study showed that the reaction was a spontaneous endothermic reaction,and the adsorption process was a coexistence of physical adsorption and chemical adsorption,which was a single-layer adsorption on the surface and there was no interaction between ions.The reduction reaction conformed to the pseudo-first-order reduction kinetics model and Co in vitamin B_(12)could promote the reduction of U(Ⅵ)by Ni^(0).VB_(12)@nZVNi has good application prospects in the treatment of U(Ⅵ)-containing wastewater due to its facile synthesis,environmental friendliness and good removal effect.

关 键 词：纳米零价镍 维生素B_(12) 铀 机理 

分 类 号：X591[环境科学与工程—环境工程]