Visible-Light-Driven Sonophotocatalysis for the Rapid Reduction of Aqueous Cr(VI) Based on Zirconium-Porphyrin Metal-Organic Frameworks with csq Topology

Dashu Chen; Wenhao Liu; Zhifen Guo; Zhi Jin; Bin Li; Hongzhu Xing

doi:10.1021/acs.inorgchem.1c02739

Visible-Light-Driven Sonophotocatalysis for the Rapid Reduction of Aqueous Cr(VI) Based on Zirconium-Porphyrin Metal-Organic Frameworks with csq Topology

Inorg Chem. 2021 Dec 6;60(23):18133-18140. doi: 10.1021/acs.inorgchem.1c02739. Epub 2021 Nov 12.

Authors

Dashu Chen^{1

2}, Wenhao Liu¹, Zhifen Guo³, Zhi Jin¹, Bin Li^{1

2}, Hongzhu Xing³

Affiliations

¹ College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, No. 26 Hexing Road, Harbin 150040, China.
² Post-doctoral Mobile Research Station of Forestry Engineering, Northeast Forestry University, No. 26 Hexing Road, Harbin 150040, China.
³ Provincial Key Laboratory of Advanced Energy Materials, College of Chemistry, Northeast Normal University, No. 5268 Renmin Street, Changchun 130024, China.

PMID: 34767358
DOI: 10.1021/acs.inorgchem.1c02739

Abstract

Photochemical treatment of highly toxic Cr(VI) is a desirable and ecofriendly method to protect the environment and human beings. In this study, a MOF-based sonophotocatalytic system is established, in which visible-light-driven sonophotocatalytic reduction of toxic Cr(VI) to Cr(III) in water is investigated using zirconium-porphyrin metal-organic frameworks (MOFs) structured as PCN-222(M) [M = H₂, Zn(II), Fe(III), Co(II)]. In the view of the synergistic effect of sonochemistry and photocatalysis, PCN-222(M) exhibited enhanced activities for Cr(VI) reduction compared with the photocatalytic process. Kinetic studies showed that apparent reaction rate constants in the sonophotocatalytic system of PCN-222(M) are 1.5-3.3 times higher than those in photocatalysis. Fluorescence and UV-vis absorption spectra measurements demonstrate that the sonophotocatalytic process promotes the transfer of photoinduced electrons from PCN-222(M) to Cr(VI), thus enhancing the catalytic performance. The innovative combination of porous MOFs and sonophotocatalytic technology might become a feasible strategy to improve the existing MOF-based photocatalytic systems.