化工新型材料

化工新型材料 ›› 2022, Vol. 50 ›› Issue (10) : 197-201. DOI: 10.19817/j.cnki.issn1006-3536.2022.10.038

科学研究

二维层状RGO/Cu₂O材料的光催化性能及机理

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Photocatalytic performance and mechanism of 2D layered RGO/Cu₂O material

Huang Fengping¹, Zou Zhengbo¹, Li Chunhua¹, Zhou Xinmin¹, Liu Chun²

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Received		Published
2021-06-28		2022-10-20
Issue Date	Revised Date
2022-11-01	2021-06-28

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摘要

以二维层状还原氧化石墨烯(RGO)为载体,采用液相原位还原法制备了二维层状RGO/Cu₂O复合材料。结合X射线衍射仪、扫描电镜、X射线光电子能谱和能谱等表征手段,对RGO/Cu₂O复合材料晶体结构、形貌分析、元素组成进行表征,并在可见光下对甲基橙进行光催化降解反应。结果表明:通过Hummers法制备出的氧化石墨烯(GO),因其具有比表面积大的优势,为Cu₂O负载提供了更多的活性位点。在可见光照射下,GO∶Cu为0.75∶1(摩尔比)时,合成出的RGO/Cu₂O复合光催化剂对甲基橙表现出最优的光催化性能,对MO的降解达到93.4%,5次循环降解实验后仍具有良好的光催化活性,明显高于纯Cu₂O;自由基捕获实验证明具有强氧化性的·OH和·O^2-活性基团为主要活性物质。复合结构可有效地抑制Cu₂O光生电子-空穴的复合,提升载流电子的分离与传输速率,为光催化降解有机污染物的工作研究提供了新的思路。

Abstract

Two-dimensional(2D) layered reduced graphene oxide(RGO/Cu₂O) composite material were prepared by liquid-phase in-situ reduction method with 2D lamellar RGO as carrier.Combining XRD,SEM,XPS,EDS and other characterization methods,the RGO/Cu₂O composite crystal structure,morphology analysis,element composition were characterized,and the methyl orange was photocatalytically degraded under visible light.The results shown that the graphene oxide(GO) prepared by the Hummers method,because of its large specific surface area,provided more active sites for Cu₂O loading.Under visible light irradiation,in which the molar ratio of GO and Cu was 0.75∶1,the as synthesized RGO/Cu₂O composite photocatalyst showed the best photocatalytic performance for methyl orange(MO),up to 93.4% degradation of MO,and still had good photocatalytic activity after five cycle degradation experiments,which was obviously higher than that of pure Cu₂O.Radical trapping experiment proved that the ·OH and ·O^2- active groups with strong oxidizing properties were the main active substances.The composite structure can effectively inhibit the Cu₂O photogenerated electron-hole recombination,improved the separation and transport rate of current-carrying electrons.A new idea for the work of photocatalytic degradation of organic pollutants was provided.

关键词

原位还原法 / 还原氧化石墨烯 / 氧化亚铜 / 复合光催化剂 / 光催化机理

Key words

in-situ reduction method / RGO / Cu₂O / composite photocatalyst / photocatalytic mechanism

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二维层状RGO/Cu₂O材料的光催化性能及机理[J]. 化工新型材料, 2022, 50(10): 197-201 DOI:10.19817/j.cnki.issn1006-3536.2022.10.038

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