Hybridization of rutile TiO2 (rTiO2) with g-C3N4 quantum dots (CN QDs): An efficient visible-light-driven Z-scheme hybridized photocatalyst
Hybridization of rutile TiO2 (rTiO2) with g-C3N4 quantum dots (CN QDs): An efficient visible-light-driven Z-scheme hybridized photocatalyst
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DOI：
10.1016/j.apcatb.2016.09.055
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发表时间：
2017-03-01
影响因子：
22.1
通讯作者：
Xia, Yang
中科院分区：
文献类型：
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作者：
Li, Yuhan;Lv, Kangle;Xia, Yang
为了充分利用太阳光，通过将P25二氧化钛和三聚氰胺的混合物在500℃下煅烧4小时，成功制备了由石墨相氮化碳量子点（CN QDs）修饰的金红石型二氧化钛（rTiO₂）复合材料（CN QDs - rTiO₂），该复合材料以两种可见光响应的半导体为组分。研究发现，CN QDs在煅烧过程中原位形成，并均匀地沉积在rTiO₂表面。CN QDs对rTiO₂的修饰不仅提高了可见光捕获能力，还抑制了光生电子 - 空穴对的复合。在所有光催化剂中，名义上CN QDs负载量为15 at.%的CN QDs - rTiO₂复合材料（S15）在可见光照射下，无论是对罗丹明B的降解还是对一氧化氮的光催化分解，都表现出最高的光催化活性。在CN QDs修饰的rTiO₂悬浮液中羟基自由基（·OH）生成量的增加支持了Z - 型降解机制，而非CN QDs - rTiO₂异质结的形成。（C）2016爱思唯尔有限公司。保留所有权利。
To make full use of solar light, fabrication of g-C3N4 quantum dots (CN QDs) modified rutile TiO2 (rTiO(2)) hybrid (CN QDs-rTiO(2)), using both visible light responsive semiconductors as components, was successfully achieved by calcination the mixture of P25 TiO2 and melamine at 500 degrees C for 4 h. It was found that CN QDs were in-situ formed during calcination, which were homogeneously deposited on the surface of rTiO(2). Modification of rTiO(2) by CN QDs not only improved the visible-light harvesting ability, but also retarded the recombination of photo-generated electron-hole pairs. CN QDs-rTiO(2) hybrid (S15) with nominal 15 at.% CN QDs loading showed the highest photocatalytic activity among all the photocatalysts, whatever for degradation of RhB or photocatalytic decomposition of NO, under visible light irradiation. The increased formation of center dot OH radicals in CN QDs modified rTiO(2) suspensions supports a Z-Scheme degradation mechanism instead of the formation of CN QDs-rTiO(2) heterojunctions. (C) 2016 Elsevier B.V. All rights reserved.