In suit constructing 2D/1D MgIn2S4/CdS heterojunction system with enhanced photocatalytic activity towards treatment of wastewater and H2 production

Hui-Yun Liu; Cheng-Gang Niu; Hai Guo; Chao Liang; Da-Wei Huang; Lei Zhang; Ya-Ya Yang; Lu Li

doi:10.1016/j.jcis.2020.05.025

In suit constructing 2D/1D MgIn₂S₄/CdS heterojunction system with enhanced photocatalytic activity towards treatment of wastewater and H₂ production

J Colloid Interface Sci. 2020 Sep 15:576:264-279. doi: 10.1016/j.jcis.2020.05.025. Epub 2020 May 11.

Authors

Hui-Yun Liu¹, Cheng-Gang Niu², Hai Guo¹, Chao Liang¹, Da-Wei Huang³, Lei Zhang⁴, Ya-Ya Yang¹, Lu Li¹

Affiliations

¹ College of Environmental Science Engineering, Key Laboratory of Environmental Biology Pollution Control, Ministry of Education, Hunan University, Changsha 410082, PR China.
² College of Environmental Science Engineering, Key Laboratory of Environmental Biology Pollution Control, Ministry of Education, Hunan University, Changsha 410082, PR China. Electronic address: cgniu@hnu.edu.cn.
³ South China Institute of Environmental Sciences, Ministry of Ecology and Environment of PRC, Guangzhou 510655, PR China.
⁴ College of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, PR China.

PMID: 32434059
DOI: 10.1016/j.jcis.2020.05.025

Abstract

A novel visible-light-driven 2D/1D MgIn₂S₄/CdS catalyst with heterostructure was fabricated for sewage treatment and energy conversion. In this study, MIS/CdS-0.3 heterostructure catalyst displayed the remarkable photocatalytic performance, which could reduce about 100% of Cr(VI) within 30 min and decompose approximately 95.98% of oxytetracycline (OTC) after 60 min. Meanwhile, the degradation details and possible decomposition pathways for OTC solution were further verified by 3D EEM and LC-MS. Moreover, the as-obtained 2D/1D MgIn₂S₄/CdS hybrid composites signally promoted the hydrogen evolved in the light illumination at 420 nm. Meanwhile, some consequences based on various characterization technologies confirmed that the significant photo-induced charge separation rate is a crucial factor in the enhancement of photocatalytic capacity. The intimate contact and the formation of heterostructure between 2D MgIn₂S₄ nanosheets and 1D CdS nanorods with matched band gaps were beneficial for charge migration. Moreover, the band structures and the density of states (DOS) of MgIn₂S₄ and CdS were obtained based on density functional theory (DFT). In addition, the results of cycling experiments, XRD spectra and PL showed that the composition and performance of the composite are well-maintained, suggesting the great recyclability and stability. This work indicated that developing a 2D/1D heterostructure photocatalyst offers a cracking approach to enhance the photocatalytic property of semiconductor-based catalysts for pollutant removal and the generation of clean energy.

Keywords: 2D/1D heterostructure; Density functional theory; H(2) production; MgIn(2)S(4)/CdS composite; Wastewater treatment.