Novel H3PW12O40/TiO2-g-C3N4 type-II heterojunction photocatalyst with enhanced visible-light photocatalytic properties
Novel H3PW12O40/TiO2-g-C3N4 type-II heterojunction photocatalyst with enhanced visible-light photocatalytic properties
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DOI：
10.1016/j.jssc.2019.03.005
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发表时间：
2019-06-01
影响因子：
3.3
通讯作者：
Yan, Jinghui
中科院分区：
文献类型：
--
作者：
Li, Lanjie;Li, Lin;Yan, Jinghui
采用超声法制备了H3 PW 12 O 40/TiO 2-g-C3 N4型异质结光催化剂。对复合材料的结构、形貌和光学性能进行了表征。20重量% H3 PW 12 O 40/TiO 2-g-C3 N4是最佳复合材料，在可见光照射下对罗丹明B（Rh B）和对硝基苯酚（PNP）具有上级光催化效率。H3 PW 12 O 40/TiO 2-g-C3 N4三元复合材料光催化性能的提高归因于对有机污染物的吸附能力增强和光生载流子的有效分离。H3 PW 12 O 40/TiO 2-g-C3 N4复合材料的光催化活性明显高于纯g-C3 N4。H3 PW 12 O 40/TiO 2-g-C3 N4复合材料表现出优异的稳定性和可回收性，可重复使用4次，只有轻微的失活。总之，本工作为制备g-C3 N4基可见光催化复合材料提出了新的方向。
A type-II heterojunction photocatalyst H3PW12O40/TiO2-g-C3N4 is obtained by ultrasonic method. The structure, morphology and optical property of the composites are studied by a series of characterizations. 20 wt.% H3PW12O40/TiO2-g-C3N4, the optimum composite, has superior photocatalytic efficiency for degrading rhodamine B (RhB) and p-nitrophenol (PNP) under visible light irradiation. The photocatalytic performance improvement of H3PW12O40/TiO2-g-C3N4 ternary composite material is ascribed to enhanced adsorption capacity of organic contaminants and efficient separation of photoinduced carriers. Furthermore, we can conclude that h(+), center dot O-2(-), and center dot OH are the major active substances in the photocatalytic degradation process, which further provides the evidence for superior photocatalytic activity of H3PW12O40/TiO2-g-C3N4 composite material compared to bare g-C3N4. The H3PW12O40/TiO2-g-C3N4 composite displays excellent stability and recyclability, which can be reused for four times with only slight inactivation. Overall, this work puts forward a new direction for the fabrication g-C3N4-based visible-light-driven photocatalytic composite materials.