Issue 19, 2024

Construction of visible light active CuS/MoS2 heterojunctions for heightened photoreduction of Cr(vi)

Abstract

CuS/MoS2 heterojunctions were fabricated by a facile one-step hydrothermal method and evaluated via the photoreduction of Cr(VI) under visible light irradiation. The CuS/MoS2 heterojunctions demonstrated a hierarchical porous structure, self-assembled from intersecting thin nanosheets, which resulted in a flower-like morphology. The optimized CuS/MoS2 heterojunction (CuS/MoS2-4.6) exhibited superior photocatalytic performance toward the removal of Cr(VI) under visible light with a k value of 1.33 × 10−2 min−1, which was much higher than that of pure CuS (2.13 × 10−4 min−1) and MoS2 (4.39 × 10−4 min−1). The enhanced Cr(VI) photoreduction performance was ascribed to the construction of a type II CuS/MoS2 heterojunction, in which electrons in the conduction band (CB) of CuS were transferred to the CB of MoS2 due to the favorable band alignment, while holes in the valence band (VB) of MoS2 flowed to the VB of CuS. This led to the efficient spatial separation and transfer of electrons and holes, inhibiting the recombination of photogenerated carriers, thus boosting the remarkable photocatalytic activity. This work provides a prospective heterojunction catalyst for photoreduction of Cr(VI).

Graphical abstract: Construction of visible light active CuS/MoS2 heterojunctions for heightened photoreduction of Cr(vi)

Article information

Article type
Paper
Submitted
09 May 2024
Accepted
06 Aug 2024
First published
20 Aug 2024

Catal. Sci. Technol., 2024,14, 5746-5754

Construction of visible light active CuS/MoS2 heterojunctions for heightened photoreduction of Cr(VI)

A. Ma, Z. Tan, W. Liu, X. Li, K. Wang, Y. Zhang, X. Jiao, J. Li, Y. Yang and F. Fu, Catal. Sci. Technol., 2024, 14, 5746 DOI: 10.1039/D4CY00598H

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