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

Author:
Zhang, Zhiguang, Wang, Siqi, Bao, Mingjun, Ren, Jiawen, Pei, Sihang, Yu, Shijun, Ke, Jun
Source:
Journal of colloid and interface science 2019 v.555 pp. 342-351
ISSN:
0021-9797
Subject:
chemical reduction, chromium, electrochemistry, electron transfer, electrons, irradiation, light, nanosilver, photocatalysis, photocatalysts, silver, silver chloride, surface plasmon resonance
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.
Agid:
6552319