光催化
材料科学
可见光谱
高分辨率透射电子显微镜
甲基橙
X射线光电子能谱
化学工程
石墨氮化碳
异质结
带隙
纳米技术
光电子学
透射电子显微镜
化学
催化作用
有机化学
工程类
作者
Qiang Wang,Qingjun Guo,Leping Wang,Bing Li
出处
期刊:Dalton Transactions
[The Royal Society of Chemistry]
日期:2016-01-01
卷期号:45 (44): 17748-17758
被引量:64
摘要
Highly crystalline and idiomorphic CoTiO3 single crystals with a well-defined polyhedral morphology were grown successfully for the first time by a facile flux method. Herein, the effects of the molten salt type and cobalt precursor on the phase composition, crystallization habit and morphology of the CoTiO3 products were also investigated. Importantly, using the flux-grown CoTiO3 crystal as the visible-light sensitizer due to its narrow band gap to couple with graphitic carbon nitride (g-C3N4) by a direct in situ thermal induced polycondensation route, novel CoTiO3/g-C3N4 composite photocatalysts were obtained. The as-synthesized samples were systematically characterized by XRD, EDS, SEM, TEM, SAED, HRTEM, FT-IR, XPS, DRS and PL techniques. The results revealed that CoTiO3 polyhedral crystals were closely combined with g-C3N4 nanosheets leading to the formation of a heterojunction structure at the interface between CoTiO3 and g-C3N4. Photocatalytic evaluation showed that the heterostructured CoTiO3/g-C3N4 composite exhibited much higher photocatalytic activity for the degradation of methyl orange under visible light irradiation than that of individual CoTiO3 and g-C3N4, which could be mainly ascribed to the synergistic effect between CoTiO3 and g-C3N4, including the enhanced visible-light harvesting ability and more efficient separation and longer lifetime of photogenerated charge carriers. Furthermore, the composite photocatalyst showed an excellent stability and reusability during four successive cycles. Finally, a possible mechanism responsible for the charge separation and improved photocatalytic activity was proposed.
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