Construction of ternary Ag/AgCl/NH2-UiO-66 hybridized heterojunction for effective photocatalytic hexavalent chromium reduction

Zhiguang Zhang; Siqi Wang; Mingjun Bao; Jiawen Ren; Sihang Pei; Shijun Yu; Jun Ke

doi:10.1016/j.jcis.2019.07.103

Construction of ternary Ag/AgCl/NH₂-UiO-66 hybridized heterojunction for effective photocatalytic hexavalent chromium reduction

J Colloid Interface Sci. 2019 Nov 1:555:342-351. doi: 10.1016/j.jcis.2019.07.103. Epub 2019 Jul 31.

Authors

Zhiguang Zhang¹, Siqi Wang², Mingjun Bao², Jiawen Ren², Sihang Pei², Shijun Yu², Jun Ke³

Affiliations

¹ School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China. Electronic address: zgzhang@lnnu.edu.cn.
² School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China.
³ School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430073, PR China. Electronic address: jke@wit.edu.cn.

PMID: 31394321
DOI: 10.1016/j.jcis.2019.07.103

Abstract

An Ag/AgCl/NH₂-UiO-66 hybridized photocatalyst was successfully constructed via facile solvothermal with UV reduction method for efficient photocatalytic Cr (VI) reduction. The photoelectrochemical data indicate that compared with the UiO-66, the charge separation and transfer efficiency of Ag/AgCl/NH₂-UiO-66 heterojunction is significantly enhanced due to the introduction of amine functionalization and formation of inorganic-organic hybrid. The surface plasmon resonance (SPR) effect deriving from Ag nanoparticles (NPs) largely extends photo-response range whilst the separation efficiency of photo-generated electrons and holes is improved significantly. The synthesized Ag/AgCl/NH₂-UiO-66 hybrid system shows ameliorated structural stability and superior photocatalytic activity for Cr (VI) reduction under visible light irradiation, which is 1.7 times higher than that of the bare UiO-66. Furthermore, the possible mechanism of Cr (VI) reduction is proposed by analyzing electron transfer path in the ternary Ag/AgCl/NH₂-UiO-66 hybridized system.

Keywords: Cr (VI) removal; Heterojunction; Metal-organic frameworks; Photo-reduction; Visible light response.