氧化亚铜改性四针状氧化锌晶须表面及其光催化性能研究

摘要/Abstract

摘要： 本文采用简便的液相还原法以乙二醇(EG)为还原剂,聚乙烯吡咯烷酮(PVP)为表面活性剂,制备了Cu₂O/T-ZnOw复合半导体催化剂样品,对样品的物相、微观形貌、禁带宽度、光致发光性能、光催化性能,以及可回收利用性能进行了详细研究。结果表明:随着PVP添加量的增加,四针状氧化锌晶须(T-ZnOw)表面沉积的Cu₂O由立方体形逐渐向球形转变;T-ZnOw表面沉积Cu₂O后可使半导体催化剂的禁带宽度(E_g)变窄,且能有效减少光生电子和空穴对的复合,使其光催化活性得到明显改善,紫外光照100 min时复合半导体催化剂对甲基橙(MO)溶液的降解率均提高到90%以上;复合催化剂中Cu₂O形貌不同其光催化活性有所差异,同等条件下,立方体形Cu₂O/T-ZnOw复合催化剂比球形Cu₂O/T-ZnOw表现出更好的光催化活性;同时复合催化剂样品展现出良好的可回收利用性能,经过六个周期的回收循环光催化降解试验后,样品对MO溶液的降解率仍能保持在80%以上。

关键词: Cu₂O/T-ZnOw, 表面沉积, PVP, 甲基橙, 光催化性能, 降解率, 可回收利用性能

Abstract: Cu₂O/T-ZnOw composite catalysts were prepared by a simple liquid-phase reduction method, in which ethylene glycol (EG) as reducing agent and polyvinyl pyrrolidone (PVP) as surfactant. The phase, morphology, band gap, photoluminescence properties, photodegradation, and recyclable performance of samples were studied in detail. The result shows that PVP plays an important role in the morphology of Cu₂O. It makes Cu₂O crystals deposited on the surface of tetrapod-like ZnO whiskers (T-ZnOw) gradually transformed from cubic to sphericity. When Cu₂O crystals deposited on T-ZnOw surface, the band gap (E_g) of semiconductor catalysts were narrowed, and the recombination of photogenerated electron and hole pairs were effectively reduced, which can significantly improve the photocatalytic activity of semiconductor. The degradation efficiency of methyl orange (MO) solution by composite catalysts is increased to more than 90% after 100 min UV irradiation. At the same condition, the cubic-Cu₂O/T-ZnOw composite shows higher photocatalytic activity than spherical-Cu₂O/T-ZnOw. After six recycles of photocatalytic degradation tests, the degradation rate of samples prepared by 0.06 g PVP can still be maintained more than 80%, which shows that the Cu₂O/T-ZnOw composites have good recyclable performance.

Key words: Cu₂O/T-ZnOw, surface deposition, PVP, methyl orange, photocatalytic performance, degradation rate, recyclable performance

中图分类号:

刘红, 刘花蓉, 范希梅. 氧化亚铜改性四针状氧化锌晶须表面及其光催化性能研究[J]. 人工晶体学报, 2024, 53(6): 1042-1050.

LIU Hong, LIU Huarong, FAN Ximei. Surface Modification of Tetrapod-Like ZnO Whisker by Cuprous Oxide and Its Photocatalytic Properties[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(6): 1042-1050.

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