物理化学学报 >> 2026, Vol. 42 >> Issue (4): 100171.doi: 10.1016/j.actphy.2025.100171

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Na2S/Na2SO3溶液促进NiS2/Mn0.5Cd0.5S肖特基/S型孪晶同质结光催化转化H2S

肖子翼1, 马心怡1, 王林平2, 胡浩斌3,*(), 刘恩周1,*()   

  1. 1 西北大学化工学院/西安市特种能源材料重点实验室, 陕西 西安 710069
    2 中石油长庆油田分公司油气工艺研究院, 陕西 西安 710021
    3 甘肃省陇东油气资源高效利用重点实验室, 陇东学院, 甘肃 庆阳 745000
  • 收稿日期:2025-07-26 修回日期:2025-08-19 录用日期:2025-08-20 发布日期:2026-01-29
  • 通讯作者: Email: hhb-88@126.com (胡浩斌)liuenzhou@nwu.edu.cn (刘恩周)

Efficient photocatalytic conversion H2S over NiS2/twinned-Mn0.5Cd0.5S Schottky/S-scheme homojunction in Na2S/Na2SO3 solution

Ziyi Xiao1, Xinyi Ma1, Linping Wang2, Haobin Hu3,*(), Enzhou Liu1,*()   

  1. 1 School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials, Northwest University, Xi'an 710069, Shaanxi Province, China
    2 PetroChina Changqing Oilfield Company Oil and Gas Technology Research Institute, Xi'an 710021, Shaanxi Province, China
    3 Gansu Key Laboratory of Efficient Utilization of Oil and Gas Resources in Longdong, Longdong University, Qingyang 745000, Gansu Province, China
  • Received:2025-07-26 Revised:2025-08-19 Accepted:2025-08-20 Published:2026-01-29
  • Contact: Email: hhb-88@126.com (Hu Haobin)liuenzhou@nwu.edu.cn (Liu Enzhou)

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摘要：

将硫化氢(H2S)有毒废气转化为氢气(H2)和高附加值含硫化学品一直是光催化分解H2S领域的重要研究目标。本文借助孪晶Mn0.5Cd0.5S (T-MCS)固溶体的结构优势促进光催化剂体相电荷分离，并将导电性能优异的二硫化镍(NiS2)负载于T-MCS表面，构建了NiS2/T-MCS界面肖特基结与体相S型孪晶同质结复合光催化剂。研究表明，NiS2不仅引入了大量活性位点，而且显著改善了表面电荷分离效率。以0.1 mol L−1 (M)硫化钠(Na2S)与0.6 M无水亚硫酸钠(Na2SO3)吸收H2S后的饱和溶液作为反应液，8 wt% NiS2/T-MCS复合材料产氢速率可达59.95 mmol h−1 g−1。傅里叶变换红外光谱(FTIR)与紫外-可见吸收光谱(UV-Vis)证实反应液中硫化合物几乎完全转化为硫代硫酸钠(Na2S2O3)，并通过滴定法对S2O32−含量进行了定量测定。本文制备的肖特基结与固溶体孪晶同质结复合材料为开发高效H2S光催化转化体系，以及同时获得H2和Na2S2O3提供了重要实验参考。

关键词: H2S处理, 孪晶Mn0.5Cd0.5S, NiS2, 同质异质结, 光催化

Abstract:

The concurrent production of hydrogen (H2) and high-value products from waste and toxic hydrogen sulfide (H2S) has long been a goal in the field of photocatalytic decomposition of H2S. In this study, the twinned Mn0.5Cd0.5S (T-MCS) was selected for its combination of solid solution and twin structure advantages, significantly promoting the bulk phase separation of CdS-based photocatalysts. Furthermore, the highly conductive nickel disulfide (NiS2) was loaded onto T-MCS to create a NiS2/T-MCS composite photocatalyst that features both a bulk phase S-scheme homojunction and an interface Schottky junction. NiS2 not only introduces a large number of active sites, but also improves the separation of surface charges obviously. Utilizing a 0.1 mol L−1 (M) sodium sulfide (Na2S) and 0.6 M anhydrous sodium sulfite (Na2SO3) solution saturated with H2S as the reaction solution, the 8 wt% NiS2/T-MCS composite achieves a remarkable hydrogen production rate of up to 59.95 mmol h−1 g−1. Fourier Transform Infrared (FTIR) spectroscopy and Ultraviolet-Visible (UV-Vis) spectroscopy confirm that the sulfur compounds in the reaction solution are nearly completely converted into high-value sodium thiosulfate (Na2S2O3). The S2O32− was also quantitatively determined by titration. This work presents a novel solid solution twin crystal-based homojunction and Schottky junction for both the photocatalytic treatment of H2S and the production of Na2S2O3.

Key words: H2S treatment, Twinned Mn0.5Cd0.5S, NiS2, Homo-heterojunction, Photocatalysis