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Electrostatic Self-assembly Aided Synthesis of CdS/Cs3PW12O40 Hybrids for Photocatalytic Reduction of Cr(VI)

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Abstract

Photocatalytic reduction is a promising approach to detoxifying carcinogenic Cr(VI) in water. Herein, CdS-sensitized Cs3PW12O40 composites were fabricated by electrostatic self-assembly followed by hydrothermal post-treatment strategy. The composite with 28.6 wt% CdS loading (CdS/CsPW) was characterized by XRD, FT-IR, SEM/TEM, EDX, UV-vis DRS, XPS, potentiometric titration, and N2 adsorption. The catalytic activity was evaluated by reducing Cr(VI) in the presence of EDTA under UV and visible light irradiation. The results revealed that CdS/CsPW had good photocatalytic reduction performance for Cr(VI) degradation under both UV and visible light illumination. After four-time repetitive use, ~ 93% of catalytic activity still remained. The photocatalytic reduction of Cr(VI) under visible light irradiation followed pseudo-first-order kinetics; the decreasing solution pH and initial Cr(VI) concentration, and increasing catalyst dosage and EDTA concentration were beneficial to Cr(VI) photoreduction. XPS analyses further indicated that the Cr(VI) adsorbed on surface of the catalyst was also reduced to Cr(III), and CdS and Cs3PW12O40 existed strong interaction. Meanwhile, the photoelectrons in CdS could migrate to Cs3PW12O40. Further, PL results verified CdS/CsPW heterostructure effectively suppressed the photogenerated electron-hole recombination. Based on experimental results, the mechanisms for Cr(VI) photoreduction by the prepared catalyst were proposed. This work may provide an attractive avenue to construct the efficient photocatalyst using polyoxometalates for environmental remediation.

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Funding

This work was supported by the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2017JM2035), Open Funding Project of State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology (No. 2016KFKT-3), and National Science Foundation of China (Grants 51979223).

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  1. College of Chemistry & Material Science, Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, Northwest University, Xi’an, 710127, People’s Republic of China

    Yunguang Yu, Zhihui Lu, Xuefang Cao & Kebin Li

  2. State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an, 710048, People’s Republic of China

    Hong Wei

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  1. Yunguang Yu
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Yu, Y., Lu, Z., Wei, H. et al. Electrostatic Self-assembly Aided Synthesis of CdS/Cs3PW12O40 Hybrids for Photocatalytic Reduction of Cr(VI). Water Air Soil Pollut 231, 345 (2020). https://doi.org/10.1007/s11270-020-04727-3

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