Structuring 尾-Ga2O3 Photonic Crystal Photocatalyst for Efficient Degradation of Organic Pollutants

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• 作者：Xiaofang Li ; Xiuzheng Zhen ; Sugang Meng ; Jiangjun Xian ; Yu Shao ; Xianzhi Fu ; Danzhen Li
• 刊名：Environmental Science & Technology
• 出版年：2013
• 出版时间：September 3, 2013
• 年：2013
• 卷：47
• 期：17
• 页码：9911-9917
• 全文大小：490K
• 年卷期：v.47,no.17(September 3, 2013)
• ISSN：1520-5851

文摘

Coupling photocatalysts with photonic crystals structure is based on the unique property of photonic crystals in confining, controlling, and manipulating the incident photons. This combination enhances the light absorption in photocatalysts and thus greatly improves their photocatalytic performance. In this study, Ga₂O₃ photonic crystals with well-arranged skeleton structures were prepared via a dip-coating infiltration method. The positions of the electronic band absorption for Ga₂O₃ photonic crystals could be made to locate on the red edge, on the blue edge, and away from the edge of their photonic band gaps by changing the pore sizes of the samples, respectively. Particularly, the electronic band absorption of the Ga₂O₃ photonic crystal with a pore size of 135 nm was enhanced more than other samples by making it locate on the red edge of its photonic band gap, which was confirmed by the higher instantaneous photocurrent and photocatalytic activity for the degradation of various organic pollutants under ultraviolet light irradiation. Furthermore, the degradation mechanism over Ga₂O₃ photonic crystals was discussed. The design of Ga₂O₃ photonic crystals presents a prospective application of photonic crystals in photocatalysis to address light harvesting and quantum efficiency problems through manipulating photons or constructing photonic crystal structure as groundwork.