Li Guangzhu, Liu Miao, Zhang Zhuqing, Geng Chao, Wu Zhongbo, Zhao Xin
Key Laboratory of Groundwater Resource and Environment, Ministry of Education, Jilin University, Changchun 130012, PR China; Environmental Monitoring Center of Jilin Province, Changchun 130011, PR China.
Key Laboratory of Groundwater Resource and Environment, Ministry of Education, Jilin University, Changchun 130012, PR China.
J Colloid Interface Sci. 2014 Jun 15;424:124-31. doi: 10.1016/j.jcis.2014.03.026. Epub 2014 Mar 19.
Surface sulfhydryl-functionalized magnetic mesoporous silica nanoparticles were prepared, aiming to extract trace alkylmercury from aqueous solution. The prepared nanoparticles were characterized by TEM, ED, EDX, DLS, FTIR, and SERS. Compare with that the non-sulfhydryl-functionalized Fe3O4@SiO2 exhibited almost no affinity for CH3Hg(+) and CH3CH2Hg(+); the sulfhydryl-functionalized Fe3O4@SiO2 exhibited high adsorption affinity for them, resulting from chelating interaction by surface sulfhydryl group, and the adsorption was not significantly impacted by pH within the range of 3.5-9.0 or coexisting metal ions. The monolayer adsorption on surface of Fe3O4@SiO2-RSH could reach equilibrium in 2 min. Moreover, the CH3Hg(+) and CH3CH2Hg(+) adsorbed on Fe3O4@SiO2-RSH could be quickly separated from the matrix in a magnetic field and desorbed easily by acetonitrile and l-cysteine aqueous solution or HCl solution, and the recoveries were more than 80%. Findings of the present work highlight the potential for using Fe3O4@SiO2-RSH magnetic nanoparticles as effective and reusable adsorbents for extraction of ultra trace alkylmercury from environmental water samples.
制备了表面巯基功能化的磁性介孔二氧化硅纳米粒子，旨在从水溶液中萃取痕量烷基汞。通过透射电子显微镜（TEM）、电子衍射（ED）、能谱分析（EDX）、动态光散射（DLS）、傅里叶变换红外光谱（FTIR）和表面增强拉曼光谱（SERS）对制备的纳米粒子进行了表征。与非巯基功能化的Fe3O4@SiO2对CH3Hg(+)和CH3CH2Hg(+)几乎没有亲和力相比，巯基功能化的Fe3O4@SiO2对它们表现出高吸附亲和力，这是由于表面巯基的螯合作用，并且在3.5 - 9.0的pH范围内或共存金属离子存在时，吸附不受显著影响。Fe3O4@SiO2-RSH表面的单层吸附在2分钟内即可达到平衡。此外，吸附在Fe3O4@SiO2-RSH上的CH3Hg(+)和CH3CH2Hg(+)可以在磁场中快速从基质中分离出来，并且很容易被乙腈、L-半胱氨酸水溶液或HCl溶液解吸，回收率超过80%。本工作的研究结果突出了使用Fe3O4@SiO2-RSH磁性纳米粒子作为从环境水样中萃取超痕量烷基汞的有效且可重复使用吸附剂的潜力。
