构建用于提高光催化性能的 Cu2O-ZnO 纤维素复合材料

Catalysts Pub Date : 2024-07-25 DOI:10.3390/catal14080476
Yuchen Li, Ming Yan, Xin Li, Jinxia Ma
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引用次数: 0

摘要

氧化锌(ZnO)纳米粒子作为一种无毒、无害、低成本的光催化材料,备受科学界和工业界的关注。然而,由于其粒径小、表面能高,氧化锌纳米粒子容易团聚。此外,氧化锌纳米粒子只有在紫外光下才具有催化活性和电子-空穴配对功能。因此,本研究通过添加 Cu2O 晶体并使用纤维素纤维基底,制备了具有优异光催化性能的氧化铜(I)(Cu2O)-ZnO/纤维素复合材料。Cu2O 可以增加 ZnO/纤维素复合材料的光吸收范围(包括紫外线和可见光)。此外,纤维素纤维还能改善 Cu2O/ZnO 纳米粒子与污染的接触面积和光稳定性,从而提高光催化活性。Cu2O-ZnO/ 纤维素复合材料降解甲基橙(MO)的光催化活性最高,分别比 ZnO/ 纤维素和 Cu2O/ZnO 复合材料高出约 40% 和 10%。此外,苯酚的降解率在 80 分钟内达到 100%。Cu2O-ZnO/cellulose 复合材料的高活性得益于其扩大了光吸收范围,并在对等物之间形成了异质结,从而有效抑制了光生电荷载流子的重组。总之,这项研究旨在通过负载 Cu2O 晶体来提高 ZnO/纤维素复合材料的光催化活性,希望能为废水处理提供一种新型高效的光催化剂。
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Construction of Cu2O-ZnO/Cellulose Composites for Enhancing the Photocatalytic Performance
Zinc oxide (ZnO) nanoparticles, as a non-toxic, harmless, and low-cost photocatalytic material, have attracted much attention from the scientific and industrial communities. However, due to their small particle size and high surface energy, ZnO nanoparticles are prone to agglomeration. In addition, ZnO nanoparticles only have catalytic activity and electron–hole pairing under ultraviolet light. Therefore, Copper(I) oxide (Cu2O)-ZnO/cellulose composites with excellent photocatalytic performance were fabricated by loading Cu2O crystals and using cellulose fiber substrate in this work. Cu2O can increase the light absorption range (including ultraviolet light and visible light) of ZnO/cellulose composites. Moreover, Cellulose fibers can improve the contact area to pollution and photostability of the Cu2O/ZnO nanoparticles, thereby enhancing the photocatalytic activity. The Cu2O-ZnO/cellulose composite showed the highest photocatalytic activity for Methyl orange (MO) degradation, which was approximately 40% and 10% times higher than those of the ZnO/cellulose and Cu2O/ZnO composites, respectively. Moreover, the degradation rate of phenol reached 100% within 80 min. The highly enhanced activity of the Cu2O-ZnO/cellulose composite is attributed to the enlargement of the light absorption range and the formation of heterojunctions between the counterparts, which effectively suppress the recombination of the photogenerated charge carriers. Overall, this work aims to improve the photocatalytic activities of ZnO/cellulose composites by loading Cu2O crystals, hoping to provide a novel and efficient photocatalyst for wastewater treatment.
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