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Open AccessArticle

Removal of Mercury (II) by EDTA-Functionalized Magnetic CoFe2O4@SiO2 Nanomaterial with Core-Shell Structure

by Kai Xia 1, Yongfu Guo 1,2,*, Qijun Shao 3,*, Qu Zan 2,4 and Renbi Bai 1
1
Center for Separation and Purification Materials &Technologies, Suzhou University of Science and Technology, Suzhou 215009, China
2
Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
3
Department of Fundamental Courses, Wuxi Institute of Technology, Wuxi 214121, China
4
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(11), 1532; https://doi.org/10.3390/nano9111532
Received: 24 September 2019 / Revised: 12 October 2019 / Accepted: 14 October 2019 / Published: 29 October 2019
(This article belongs to the Special Issue Nanomaterials and Nanotechnology in Wastewater Treatment)
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 CoFe2O4@SiO2 was prepared by EDTA-functionalized method using a safe, mild and simple hydrothermal method. The results show that the prepared material of CoFe2O4@SiO2-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 CoFe2O4@SiO2-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. View Full-Text
Keywords: magnetic material; adsorption; heavy metal; mercury; EDTA functionalization magnetic material; adsorption; heavy metal; mercury; EDTA functionalization
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MDPI and ACS Style

Xia, K.; Guo, Y.; Shao, Q.; Zan, Q.; Bai, R. Removal of Mercury (II) by EDTA-Functionalized Magnetic CoFe2O4@SiO2 Nanomaterial with Core-Shell Structure. Nanomaterials 2019, 9, 1532.

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