Controlled fabrication of alpha-GaOOH with a novel needle-like submicron tubular structure and its enhanced photocatalytic performance
Controlled fabrication of alpha-GaOOH with a novel needle-like submicron tubular structure and its enhanced photocatalytic performance
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具有新型针状亚微米管状结构的α-GaOOH的受控制造及其增强的光催化性能
DOI：
10.1016/j.jallcom.2015.03.088
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发表时间：
2015
影响因子：
6.2
通讯作者：
Lei M.
中科院分区：
文献类型：
--
作者：
Xu X.;Bi K.;Huang K.;Liang C.;Lin S.;Wang W. J.;Yang T. Z.;Liu J.;Fan D. Y.;Yang H. J.;Wang Y. G.;Lei M.
采用有机金属反应物辅助水热法首次合成了具有新型针状亚微米管状结构的斜方晶系氧化镓氢氧化物（α-GaOOH）。一种可能的制造工艺表明，OH−离子的浓度在亚微米管的形成中起着重要作用。此外，通过改变溶剂的pH值，还成功地合成了纳米、亚微米和微米级的四种形貌可控的α-GaOOH粒子。光致发光（PL）表明，α-GaOOH中存在大量的本征缺陷。以亚甲基蓝（MB）水溶液为降解对象，考察了不同形貌的α-GaOOH的光催化活性。具有新型管状结构的α-GaOOH催化剂的催化效率比其他催化剂有较大提高。光催化活性的提高是由于有效地抑制了本征缺陷引起的光生电子-空穴对的复合。
Orthorhombic gallium oxide hydroxide (α-GaOOH) with a novel needle-like submicron tubular structure has been firstly fabricated by an organometallic reactant-assisted hydrothermal route. A possible fabrication process indicates that the concentration of OH−ions plays an important role in the formation of submicron tube. Moreover, other four kinds of shape-controllable α-GaOOH particles of nano-, submicron- and micro-size have also been successfully synthesized by changing the pH values of solvent. The photoluminescence (PL) performance demonstrates that there are a plenty of intrinsic defects in α-GaOOH. Furthermore, the photocatalytic activity of α-GaOOH with different morphologies was evaluated by degrading methylene blue (MB) aqueous solution. The efficiency of α-GaOOH with a novel tubular structure improves much more than other catalysts. The enhanced photocatalytic activity can be attributed to the effective inhibition of photo-generated electron–hole pair’s recombination resulted from intrinsic defects.