Facial-hydroxylated pure-phase BiFeO3 with controllable micro-morphology: performance as a highly efficient visible light photocatalyst
Facial-hydroxylated pure-phase BiFeO3 with controllable micro-morphology: performance as a highly efficient visible light photocatalyst
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具有可控微观形貌的表面羟基化纯相 BiFeO3：作为高效可见光光催化剂的性能
DOI：
10.1007/s10854-018-8939-x
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发表时间：
2018-03
期刊：
影响因子：
--
通讯作者：
Tong Zhengfu
中科院分区：
文献类型：
--
作者：
Liu Yang;Xu Guowang;Lv Hui;Chen Yiwan;Deng Gang;Pei Ling;Tong Zhengfu
采用新型共沉淀-水热协同合成方法成功制备了具有不同微观形貌的纯相BiFeO3晶体。创新地采用羟基化技术对BiFeO3样品进行羟基化处理。XPS和PL光谱证实羟基化处理确实在BiFeO3样品表面引入了更多的·OH自由基。样品E（羟基化BiFeO3超薄片）表现出最高的光催化活性。制备的羟基化BiFeO3在水中光氧化反应中也表现出较高的产氧活性。由于大的比表面积、强的可见光响应、光激发载体的重组率降低以及表面羟基化引入的过量·OH自由基，所有羟基化样品都表现出明显增强的光催化活性。所有BiFeO3样品都具有良好的光化学稳定性，可以重复使用。本研究为BiFeO3光催化剂的制备和应用提供了有价值的贡献。
The pure-phase BiFeO3 crystals with distinguished micro-morphologies were successfully prepared by a novel coprecipitation-hydrothermal collaborative synthesis method. Hydroxylation technique was innovatively employed to hydroxylate BiFeO3 samples. XPS and PL spectra proved that hydroxylation treatment indeed introduced more ·OH radicals on the surfaces of the BiFeO3 samples. Sample E (hydroxylated BiFeO3 ultra-thin slices) showed the highest photocatalytic activity. Hydroxylated BiFeO3 prepared in this work also showed high activities in water photo-oxidation reactions for producing oxygen gas. All hydroxylated samples showed notably enhanced photocatalytic activities due to the large specific surface areas, strong visible light responses, diminished recombination rates of the photo-excited carriers and excess ·OH radicals introduced by surface hydroxylation. All BiFeO3 samples showed good photochemical stabilities for reusage. This work provides valuable contributions in the future preparations and applications for BiFeO3 photocatalysts.
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