凹凸棒土负载纳米铁/镍去除水中Zn(Ⅱ)的性能与机理研究  

Performance and mechanism of Zn(Ⅱ) removal by attapulgite-supported nano Fe/Ni from aqueous solution

作　　者：龚璇 刘红[1,2] 范先媛[1,2] 张家源 冯涛[1,2] GONG Xuan;LIU Hong;FAN Xianyuan;ZHANG Jiayuan;FENG Tao(College of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of metallurgic Mineral Resources, Wuhan University of Science and Technology, Wuhan 430081, China)

机构地区：[1]武汉科技大学资源与环境工程学院,武汉430081 [2]武汉科技大学冶金矿产资源高效利用与造块湖北省重点实验室,武汉430081

出　　处：《黑龙江大学自然科学学报》2018年第2期200-205,共6页Journal of Natural Science of Heilongjiang University

基　　金：国家自然科学基金资助项目(50904047);湖北省环保科研项目(2017HB08)

摘　　要：针对纳米零价铁易团聚和表面形成钝化层的问题,以凹凸棒土为载体、镍为掺杂金属,制备了凹凸棒土负载铁/镍复合材料(用A-Fe/Ni表示)。由SEM可观察到A-Fe/Ni中的纳米Fe/Ni长链变短、且有单个纳米Fe/Ni球形颗粒出现。比表面积测定结果表明,A-Fe/Ni的BET比表面积为86.17 m2·g-1,远高于纳米Fe/Ni的比表面积(33.62 m2·g-1)。平均粒径也由负载前的178.52 nm减小到了69.63 nm。A-Fe/Ni相比纳米Fe/Ni对水中Zn(Ⅱ)有更快的去除速率和更好的去除效果,以2 g·L-1投加量对100 mg·L-1Zn(Ⅱ)进行吸附,10 min即可达到99.8%的去除率,而成本仅为后者的1/3。A-Fe/Ni除锌机理主要是化学吸附,吸附过程符合Lagergren准二级动力学模型和Langmuir吸附模型,最大吸附量为133.33 mg·g^(-1)。An attapulgite supported nano Fe/Ni （A-Fe/Ni） composite was prepared using attapulgite as a carrier and nickel as a doping metal to provide a possible solution on aggregation and passivation of nano zero-valent iron. The scanning electron microscopic analysis indicated that the chain-like structure of A-Fe/Ni was shortened compared with nano Fe/Ni. It was also found the presence of single spherical particle of nano Fe/Ni in the A-Fe/Ni composite. The BET specific surface area of A Fe/Ni was deter- mined to be 86.17 m2 · g^-1, almost tripled of Fe/Ni （33.62 m2 · g^-1 ） area. The attapulgite support re- suited in a reduction of average particle size from 178.52 nm （Fe/Ni） to 69.63 nm （A-Fe/Ni）. Moreo- ver, the kinetic rate and efficiency of Zn（II） removal by A-Fe/Ni were improved compared with that ofFe/Ni. The removal efficiency of 100 mg · L^-1 Zn（II）within 10 min was 99.8%, by A-Fe/Ni at the dosage of 2 g · L^-1, while the cost of A-Fe/Ni was only 1/3 compared with Fe/Ni. The removal mecha- nism of Zn（II） by the A-Fe/Ni was mainly attributed to chemisorption and the adsorption process was fol- lowed pseudo-second-order kinetic model and Langmuir adsorption isotherm. The maximum adsorption capacity of A-Fe/Ni was 133.33 mg · g^-1.

关 键 词：凹凸棒土 纳米零价铁 Zn(Ⅱ) 吸附 

分 类 号：X703.1[环境科学与工程—环境工程]