SnS2/SnS heterojunction: An all-weather-active photocatalyst for Cr (VI) removal

被引：11
作者：
He, Xiaodie [1 ]
He, Tiwei [1 ]
Xia, Ruidi [1 ]
Qi, Yufan [1 ]
Zhou, Yunjie [1 ]
Song, Bin [1 ]
Liao, Fan [1 ]
Kang, Zhenhui [1 ,2 ]
Jiang, Lin [1 ]
机构：
[1] Soochow Univ, Inst Funct Nano & Soft Mat FUNSOM, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Suzhou 215123, Jiangsu, Peoples R China
[2] Macau Univ Sci & Technol, Macao Inst Mat Sci & Engn MIMSE, MUST SUDA Joint Res Ctr Adv Funct Mat, Taipa 999078, Macao, Peoples R China
来源：
SEPARATION AND PURIFICATION TECHNOLOGY | 2023年 / 324卷
基金：
中国国家自然科学基金;
关键词：
CR(VI) REDUCTION; NANOSHEETS; SNS; HETEROSTRUCTURE; ENHANCEMENT; DESIGN; HYBRID;
D O I：
10.1016/j.seppur.2023.124515
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Photoreduction is a sustainable method for the removal of the harmful heavy metal ions. However, the low photocatalytic activity due to limited solar energy utilization and sluggish separation of photogenerated electrons/hole pairs is a major challenge. Here, we report the design and preparation of SnS2/SnS hetero-junction nanosheets with full-band response for efficient photoreduction of Cr(VI). The SnS2/SnS heterojunction has a three-dimensional lamellar structure with tight interfacial links that facilitate inter-electron hole transport. Among the samples, SnS2/SnS-2 (Sn4+: Sn2+ = 1: 0.218) shows optimal photoreduction of Cr(VI) under simulated solar light. Remarkably, SnS2/SnS-2 exhibited a high removal rate of Cr(VI) under all-weather conditions, with 50% removal achieved in 2 h under sunlight and 10% removal in 2 h under cloudy condition in neutral lake water, indicating practical catalytic performance and energy-saving potential. The presence of SnS not only improves the optical absorption capacity in the near-infrared region and enhances the photo-thermal conversion efficiency, but also accelerates the separation ability of photogenerated carriers, leading to high photocatalytic efficiency. Our work provides a promising concept for continuous Cr(VI) removal under all-weather conditions, including weak light irradiation.
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页数：9
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