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Hourglass-type Polyoxometalate-based Crystalline Materials as Efficient Cooperating Photocatalysts for the Reduction of Cr(VI) and Oxidation of Dye

Abstract

The visible-light-driven simultaneous conversion of toxic Cr(VI) and organic dyes is a promising approach to alleviate environmental pollution, in which the key point is developing efficient photocatalysts. Here a series of reduced Mov-contained hourglass-type polyoxometalate crystalline materials with formula of (H2bpp)2[{Na4(H2O)5}{Co0.8Cd0.2(H2O)2}{Cd[Mo6O12(OH)3(H2PO4)(HPO4)(PO4)2]2}]·2H2O (1); (H2bpp)3[Zn2{Cd[Mo6O12(OH)3- (HPO4)3(PO4)]2}]·6H2O (2); [(H2bpp)3(bpp)2][{Al2(H2O)4}{Cd[Mo6O12(OH)3(H2PO4)2(HPO4)(PO4)]2}2]·9H2O (3) (bpp = 1,3-bi(4-pyridyl)propane) were prepared as synergetic photocatalysts for Cr(VI) reduction and methylene blue (MB) oxidation under visible-light irradiation. Three assemblies display wide visible-light adsorption, suitable energy-level structure and excellent redox activity. When using as photocatalysts, assemblies 1-3 exhibited excellent visible-light photocatalytic activity. Under the original pH condition, the removal ratios of Cr(VI) can be reached 74%, 68%, 55%, and the degradation ratios of MB are 96%, 87%, 88% for 1-3 with 3 hours irradiation, respectively. These results were higher than those of the separated half reactions, suggesting the synergistic effect between Cr(VI) reduction and MB oxidative degradation accelerates the separation and utilization of photo-generated electrons and holes. The possible reaction mechanism has also been provided. This work provides some guidance for reduced polyoxometalate-based materials as potential candidates for environmental restoration.

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Supplementary files

Article information


Submitted
02 Feb 2020
Accepted
06 Mar 2020
First published
06 Mar 2020

Catal. Sci. Technol., 2020, Accepted Manuscript
Article type
Paper

Hourglass-type Polyoxometalate-based Crystalline Materials as Efficient Cooperating Photocatalysts for the Reduction of Cr(VI) and Oxidation of Dye

X. Tian, Y. Zhang, Y. Ma, Q. Zhao and Z. Han, Catal. Sci. Technol., 2020, Accepted Manuscript , DOI: 10.1039/D0CY00208A

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