Ion-imprinted silica gel and its dynamic membrane for nickel ion removal from wastewaters

doi:10.1007/s11705-020-1915-z

Front. Chem. Sci. Eng.

2020, Vol. 14

Issue (6) : 1018-1028 https://doi.org/10.1007/s11705-020-1915-z

RESEARCH ARTICLE

Ion-imprinted silica gel and its dynamic membrane for nickel ion removal from wastewaters

Jiehui Zeng, Jianxian Zeng(

), Hu Zhou, Guoqing Liu, Zhengqiu Yuan, Jian Jian

School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China

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Abstract

An ion-imprinted sorbent (IIP) was prepared by using Ni²⁺ as template, 3-[2-(2-aminoethylamino) ethylamino] propyl-trimethoxysilane as functional monomer, and silica gel as carrier. The adsorption performance of IIP towards Ni²⁺ was investigated. IIP showed a higher adsorption capacity than that of non-imprinted sorbent, and it also exhibited high selectivity for Ni²⁺ in the presence of Cu²⁺ and Zn²⁺ ions. Then, IIP was used to form a dynamic membrane onto the surface of ceramic membrane for treatment of electroplating wastewater containing Ni²⁺. Compared with ceramic membrane, IIP dynamic membrane had much higher steady membrane flux, and also rejected Ni²⁺ to obtain a lower concentration of Ni²⁺ in the permeate fluid. Perhaps it is suitable for future practice applications.

Keywords ion-imprinted nickel ion dynamic membrane adsorption

Corresponding Author(s): Jianxian Zeng

Online First Date: 13 March 2020 Issue Date: 11 September 2020

Cite this article:

Jiehui Zeng,Jianxian Zeng,Hu Zhou, et al. Ion-imprinted silica gel and its dynamic membrane for nickel ion removal from wastewaters[J]. Front. Chem. Sci. Eng., 2020, 14(6): 1018-1028.

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http://journal.hep.com.cn/fcse/EN/10.1007/s11705-020-1915-z
http://journal.hep.com.cn/fcse/EN/Y2020/V14/I6/1018

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	Jiehui Zeng
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	Guoqing Liu
	Zhengqiu Yuan
	Jian Jian

Fig.1 Schematic diagram of preparation process of IIP.

Fig.2 Effects of (a) the order of adding template ions, (b) reaction time and (c) reaction temperature on adsorption capacities.

Fig.3 FTIR spectra of (a) silica gel, (b) NIP and (c) IIP.

Fig.4 TGA of (a) silica gel, (b) NIP and (c) IIP.

Fig.5 Effect of initial concentration of Ni²⁺ on adsorption capacities of IIP and NIP (sorbent mass, 0.1 g; pH, 6; temperature, 25°C).

Tab.1 Effect of pH on adsorption capacity of IIP towards Ni²⁺ *

Fig.6 Competitive adsorption of metal ions on IIP and NIP from the mixed solutions containing Ni²⁺, Cu²⁺ and Zn²⁺ ions (sorbent mass, 0.1 g; initial concentrations of Ni²⁺, Cu²⁺ and Zn²⁺ ions all were 100 mg·L⁻¹; pH, 6; temperature, 25°C).

Tab.2 The selectivity parameters of IIP and NIP *

Tab.3 The reusability performance of IIP *

Fig.7 (a) Schematic diagrams of ceramic membrane filtration and (b) IIP dynamic membrane filtration for an electroplating wastewater by cross-flow mode.

Fig.8 Formation of IIP dynamic membranes under different transmembrane pressures (cross-flow velocity, 1.0 m·s⁻¹; IIP suspension concentration, 1.0 g·L⁻¹; temperature, 25°C).

Fig.9 Surface SEM images of (a) ceramic membrane, (b) IIP dynamic membrane, and (c) filtrated IIP dynamic membrane.

Fig.10 Comparison of membrane flux with ceramic membrane, IIP and NIP dynamic membranes by using the electroplating wastewater as the feed solution (pH, 9; temperature, 25°C; transmembrane pressure, 0.10 MPa; cross-flow velocity, 1.0 m·s⁻¹; free nickel ion concentration in the feed, 13.26 mg·L⁻¹; feed volume, 20 L).

Fig.11 Different rejection abilities for Ni²⁺ with the ceramic membrane, IIP and NIP dynamic membranes by using the electroplating wastewater as the feed solution (pH, 9; temperature, 25°C; transmembrane pressure, 0.10 MPa; cross-flow velocity, 1.0 m?s⁻¹; free nickel ion concentration in the feed, 13.26 mg·L⁻¹; feed volume, 20 L).

Fig.12 The regeneration performance of IIP dynamic membrane (pH, 9; temperature, 25°C; transmembrane pressure, 0.10 MPa; cross-flow velocity, 1.0 m·s⁻¹; free nickel ion concentration in the feed, 13.26 mg·L⁻¹).

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