应用化学 ›› 2025, Vol. 42 ›› Issue (8): 1125-1134.DOI: 10.19894/j.issn.1000-0518.240359

• 研究论文 • 上一篇    下一篇

三元硫化物增强g-C3N4光催化还原六价铬性能

邰玲1(), 赵志超1, 景新华2, 丛吉祥1, 畅福善2, 张晓斌1   

  1. 1.运城学院应用化学系,运城 044000
    2.山西物联工业自动化技术研究院,运城 044000
  • 收稿日期:2024-11-07 接受日期:2025-06-28 出版日期:2025-08-01 发布日期:2025-08-11
  • 通讯作者: 邰玲

Enhanced Photocatalytic Activity of g-C3N4 Towards Hexavalent Chromium with Ternary Sulfide

Ling TAI1(), Zhi-Chao ZHAO1, Xin-Hua JING2, Ji-Xiang CONG1, Fu-Shan CHANG2, Xiao-Bin ZHANG1   

  1. 1.Department of Applied Chemistry,Yuncheng University,Yuncheng 044500,China
    2.Shanxi Institute of Io T Industrial Automation Technology,Yuncheng 044500,China
  • Received:2024-11-07 Accepted:2025-06-28 Published:2025-08-01 Online:2025-08-11
  • Contact: Ling TAI
  • About author:tling08@126.com
  • Supported by:
    the Science and Technology Project of Yun Cheng City, Shanxi Province(YCKJ-2021032);the Project of Salt Lake Protection and Utilization Research Institute of Yun Cheng, Shanxi Province(YHYJ-2023004);the Natural Science Foundation (Face Nature Foundation) of Shanxi Province in 2024(202303021211189)

摘要:

六价铬的化合物广泛应用于化工产业,较难自然降解。 用复合纳米材料作为光催化剂处理六价铬Cr(Ⅵ)呈现出较高的光催化活性。 利用水热法制备g-C3N4/ZnIn2S4g-C3N4/CaIn2S4纳米异质结材料,并采用X射线衍射(XRD)、扫描电子显微镜(SEM)、物理吸附(BET)、紫外-可见-近红外光谱(UV-Vis-NIR)、X射线光电子能谱(XPS)和电子自旋共振(EPR)等方法进行表征。 在无光照和可见光的环境下测试g-C3N4/ZnIn2S4g-C3N4/CaIn2S4材料对Cr(Ⅵ)的还原能力,并分别使用对苯醌(PBQ,1 mmol)、乙二胺四乙酸二钠盐(EDTA-2 Na,1 mmol)和叔丁醇(TBA,0.5 mL)作为超氧自由基(·O2-)、空穴(h+)和羟基自由基(·OH)的清除剂,根据不同自由基被捕获后Cr(Ⅵ)的降解浓度的变化,来确定光催化反应的活性物种。 实验结果表明,g-C3N4/ZnIn2S4(质量比,1∶1)复合材料和g-C3N4/CaIn2S4(质量比,1∶1)复合材料对于Cr(Ⅵ)的还原能力催化效果最为显著,降解效率分别达95.5%和60%; 对比0.5∶1、1∶1和2∶1不同质量比的g-C3N4/ZnIn2S4复合材料对Cr(Ⅵ)的还原能力,发现质量比1∶1的g-C3N4/ZnIn2S4复合材料催化效果最佳,其次是质量比0.5∶1和质量比2∶1的复合材料,二者的降解效率分别为27%和16%; 超氧自由基(·O2-)、光生空穴(h+)和羟基自由基(·OH)均参与反应,并且自由基的影响能力由大到小为h+>·O2->·OH。

关键词: g-C3N4/ZnIn2S4, g-C3N4/CaIn2S4, 光催化, 六价铬

Abstract:

Hexavalent chromium compounds are widely used in the chemical industry and are difficult to degrade naturally. Using composite nanomaterials as photocatalysts to treat hexavalent chromium Cr(Ⅵ) shows high photocatalytic activity. g-C3N4/ZnIn2S4 and g-C3N4/CaIn2S4 nano heterojunction materials were prepared by hydrothermal method, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), physical adsorption analyzer (BET), UV-visible near-infrared spectroscopy (UV-Vis-NIR), X-ray photoelectron spectroscopy (XPS) and electron spin resonance (EPR). The reduction capacity of g-C3N4/ZnIn2S4 and g-C3N4/CaIn2S4 materials on Cr(Ⅵ) was tested in both non illuminated and visible light environments, and 1,4-benzoquinone (PBQ, 1 mmol), disodium ethylenediaminetetraacetic acid (EDTA-2 Na, 1 mmol) and tert-butanol (TBA, 0.5 mL) were used as scavengers for superoxide radicals(·O2-), holes(h+) and hydroxyl radicals (·OH). The active species of the photocatalytic reaction were determined based on the changes in the degradation concentration of Cr(Ⅵ) after capturing different radicals. The experimental results show that the g-C3N4/ZnIn2S4(1∶1) composite material and the g-C3N4/CaIn2S4(1∶1) composite material have the most significant catalytic effects on the reduction ability of Cr(Ⅵ), with degradation efficiencies reaching 95.5% and 60% respectively. Comparing the reduction ability of Cr(Ⅵ) by g-C3N4/ZnIn2S4 composite materials with different mass ratios (0.5∶1, 1∶1 and 2∶1), it was found that a 1∶1 g-C3N4/ZnIn2S4 composite material had the best catalytic effect,followed by 0.5∶1 and 2∶1, the degradation efficiency was 27% and 16%, respectively; Superoxide radicals (·O2-), photogenerated holes (h+) and hydroxyl radicals (·OH) all participate in the reaction, and the influence of free radicals is in the order of h+>·O2->·OH.

Key words: g-C3N4/ZnIn2S4, g-C3N4/CaIn2S4, Photocatalytic, Hexavalent chromium

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