Facile Synthesis of Polypyrrole-Functionalized CoFe₂O₄@SiO₂ for Removal for Hg(II)

Yuhao Zhao; Kai Xia; Zhenzong Zhang; Ziming Zhu; Yongfu Guo; Zan Qu

doi:10.3390/nano9030455

Facile Synthesis of Polypyrrole-Functionalized CoFe₂O₄@SiO₂ for Removal for Hg(II)

Nanomaterials (Basel). 2019 Mar 19;9(3):455. doi: 10.3390/nano9030455.

Authors

Yuhao Zhao¹, Kai Xia², Zhenzong Zhang³, Ziming Zhu⁴, Yongfu Guo^{5

6}, Zan Qu^{7

8}

Affiliations

¹ School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China. 1713022014@post.usts.edu.cn.
² School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China. 1713022009@post.usts.edu.cn.
³ School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China. 1713022013@post.usts.edu.cn.
⁴ School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China. 1513022025@post.usts.edu.cn.
⁵ School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China. yongfuguo@mail.usts.edu.cn.
⁶ Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China. yongfuguo@mail.usts.edu.cn.
⁷ Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China. quzan@sjtu.edu.cn.
⁸ School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. quzan@sjtu.edu.cn.

Abstract

In order to avoid using toxic or harmful operational conditions, shorten synthesis time, enhance adsorption capacity, and reduce operational cost, a novel magnetic nano-adsorbent of CoFe₂O₄@SiO₂ with core⁻shell structure was successfully functionalized with polypyrrole (Ppy). The physical and chemical properties of CoFe₂O₄@SiO₂-Ppy are examined by various means. The as-prepared CoFe₂O₄@SiO₂-Ppy nanomaterial was used to adsorb Hg²⁺ from water. During the process, some key effect factors were studied. The adsorption process of Hg²⁺ onto CoFe₂O₄@SiO₂-Ppy was consistent with the pseudo-second-order kinetic and Langmuir models. The Langmuir capacity reached 680.2 mg/g, exceeding those of many adsorbents. The as-prepared material had excellent regeneration ability, dispersibility, and stability. The fitting of kinetics, isotherms, and thermodynamics indicated the removal was endothermic and spontaneous, and involved some chemical reactions. The application evaluation of electroplating wastewater also shows that CoFe₂O₄@SiO₂-Ppy is an excellent adsorbent for Hg²⁺ ions from water.

Keywords: adsorbent; heavy metal; mercury; modification; polypyrrole.

Abstract

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