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

Overview

Journal Nanomaterials (Basel)

Date 2019 Nov 2

PMID 31671771

Citations 14

Authors

Kai Xia

Yongfu Guo

Qijun Shao

Qu Zan

Renbi Bai

Affiliations

Soon will be listed here.

Abstract

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.

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