In Situ Microwave-Assisted Synthesis of Porous N-TiO2/g-C3N4 Heterojunctions with Enhanced Visible-Light Photocatalytic Properties
In Situ Microwave-Assisted Synthesis of Porous N-TiO2/g-C3N4 Heterojunctions with Enhanced Visible-Light Photocatalytic Properties
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原位微波辅助合成具有增强可见光催化性能的多孔 N-TiO2/g-C3N4 异质结
DOI：
10.1021/ie402820v
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发表时间：
2013-12-04
影响因子：
4.2
通讯作者：
Hao, Ying-juan
中科院分区：
文献类型：
--
作者：
Wang, Xiao-jing;Yang, Wen-yan;Hao, Ying-juan
开发了一种原位微波辅助合成方法，以 H2TiO3 作为反应物，NH3 中心点 H2O 作为 N 掺杂源，制备 N-TiO2/g-C3N4 复合材料。这样，N-TiO2/g-C3N4复合催化剂具有多孔结构和大的比表面积，增加了污染物的接触面积。通过降解罗丹明B（Rh B）和亚甲基蓝（MB）来评价样品在可见光照射下的光催化活性。含有 40 wt% N-TiO2 的 N-TiO2/g-C3N4 复合材料表现出最高的光催化活性，最佳温度为 400 ℃。N-TiO2/g-C3N4 复合材料光催化活性的增加可归因于 N-TiO2 和 g-C3N4 之间异质结的形成，抑制了光生电子空穴对的复合。自由基清除剂的测试证实O-中心点(2)-是光催化过程中的主要活性物种。
An in situ microwave-assisted synthesis approach has been developed to prepare N-TiO2/g-C3N4 composites using H2TiO3 as the reactant and NH3 center dot H2O as the N-doping source. In this way, the N-TiO2/g-C3N4 composite catalysts have a porous structure and large surface areas, which increase the contact area of pollutants. Degradation of rhodamine B (Rh B) and methylene blue (MB) were carried out to evaluate the photocatalytic activity of samples under visible light irradiation. N-TiO2/g-C3N4 composite with 40 wt % N-TiO2 exhibits the highest photocatalytic activity and the optimal temperature is 400 degrees C. The increased photocatalytic activity of N-TiO2/g-C3N4 composites can be attributed to the formation of the heterojunction between N-TiO2 and g-C3N4, which suppresses the recombination of photoinduced electron-hole pairs. The tests of radical scavengers confirmed that O-center dot(2)- was the main reactive species during the photocatalytic process.