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Material Sciences 2024
g-C3N4纳米管/NiS2复合材料的制备及其光催化性能
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Abstract:
首先以三聚氰胺为原料，通过水热结合煅烧的方法制备了g-C3N4纳米管(tg-C3N4)。然后以硝酸镍和硫代乙酰胺为前驱体，通过水热的方法制备出tg-C3N4/NiS2复合材料。采用XRD、FTIR、TEM、UV-Vis、PL和电化学测试方法对其进行了表征。结果表明，与tg-C3N4相比，tg-C3N4/NiS2复合材料具有更强的光吸收性能和光生电子–空穴分离效率。通过可见光下降解罗丹明B对其催化性能进行评价。结果发现：当NiS2质量分数为3%时，复合材料呈现出最佳的光催化效率，其对罗丹明B降解速率为0.0635 min？1，是tg-C3N4 (0.0145 min？1)的4.3倍。通过活性物种捕获实验可知，
和·OH在光催化降解过程中起着主要作用。
Firstly, g-C3N4 nanotubes (tg-C3N4) were prepared by hydrothermal combined with thermal polyme- rization using melamine as raw material. Then tg-C3N4/NiS2 composites were prepared by hydrothermal method using nickel nitrate and thioacetamide as precursors. The catalysts were characterized by XRD, FTIR, TEM, UV-Vis, PL and electrochemical tests. The results show that the tg-C3N4/NiS2 composites have enhanced light absorption properties and photogenerated electron-hole separation efficiency compared with tg-C3N4. The catalytic performance was evaluated by visible light degradation of Rhodamine B. It was found that the composite exhibited the best photocatalytic efficiency when the NiS2 mass fraction was 3%, and its degradation rate was 0.0635 min？1, which was 4.3 times as that of tg-C3N4 (0.0145 min？1). According to the active species trapping experiment,
and ·OH played the main roles in the photocatalytic degradation process.
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