具有核壳结构的EDTA功能化磁性CoFeO@SiO纳米材料去除汞（II）

Removal of Mercury (II) by EDTA-Functionalized Magnetic CoFeO@SiO Nanomaterial with Core-Shell Structure.

作者信息

Xia Kai, Guo Yongfu, Shao Qijun, Zan Qu, Bai Renbi

机构信息

Center for Separation and Purification Materials &Technologies, Suzhou University of Science and Technology, Suzhou 215009, China.

Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.

出版信息

Nanomaterials (Basel). 2019 Oct 29;9(11):1532. doi: 10.3390/nano9111532.

In order to reduce the difficulty and risk of operation, decrease the preparation time and improve the adsorption performance of magnetic nano-silicon adsorbent with core-shell structure, a carboxylated CoFeO@SiO was prepared by EDTA-functionalized method using a safe, mild and simple hydrothermal method. The results show that the prepared material of CoFeO@SiO-EDTA has a maximum adsorption capacity of 103.3 mg/g for mercury ions (Hg(II)) at pH = 7. The adsorption process of Hg(II) is a chemical reaction involving chelation and single-layer adsorption, and follows the pseudo-second-order kinetic and Langmuir adsorption isotherm models. Moreover, the removal of Hg(II) is a spontaneous and exothermic reaction. The material characterization, before and after adsorption, shows that CoFeO@SiO-EDTA has excellent recyclability, hydrothermal stability and fully biodegradable properties. To summarize, it is a potential adsorption material for removing heavy metals from aqueous solutions in practical applications.

为降低操作难度与风险，缩短制备时间并提高核壳结构磁性纳米硅吸附剂的吸附性能，采用安全、温和且简便的水热法，通过乙二胺四乙酸（EDTA）功能化法制备了羧基化CoFeO@SiO。结果表明，制备的CoFeO@SiO-EDTA材料在pH = 7时对汞离子（Hg(II)）的最大吸附容量为103.3 mg/g。Hg(II)的吸附过程是一个涉及螯合和单层吸附的化学反应，遵循准二级动力学和朗缪尔吸附等温线模型。此外，Hg(II)的去除是一个自发的放热反应。吸附前后的材料表征表明，CoFeO@SiO-EDTA具有优异的可回收性、水热稳定性和完全可生物降解性。综上所述，它是实际应用中从水溶液中去除重金属的潜在吸附材料。