Core-shell g-C3N4/Pt/TiO2 nanowires for simultaneous photocatalytic H-2 evolution and RhB degradation under visible light irradiation

Dou Hailong; Qin Yumei; Pan FengLong DanRao XiXu Guo QinZhang Yongping

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Core-shell g-C3N4/Pt/TiO2 nanowires for simultaneous photocatalytic H-2 evolution and RhB degradation under visible light irradiation

机译：核壳g-C3N4 / Pt /二氧化钛纳米线同时光催化氢进化和RhB可见光照射下退化

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Core-shell g-C3N4/Pt/TiO2 nanowire structures were successfully synthesized through a facile two-step synthetic methodology, involving photodepositing Pt nanoparticles on the surface of TiO2 nanowires and subsequent growth of g-C3N4 (CN) layers via thermal evaporation of urea. The as-prepared CN/Pt/TiO2 composites show a higher photocurrent density compared to CN/TiO2. The CN/Pt/TiO2 photocatalysts exhibit an enhanced H-2 evolution rate of 8.93 mu mol h(-1) under visible light irradiation, which is 1.25 times higher than that of CN/TiO2 (7.15 mu mol h(-1)), while Pt/TiO2 and TiO2 nanowires do not show any visible light responses. Our experiments demonstrate for the first time that CN/Pt/TiO2 with a unique core-shell nanowire structure of semiconductor-metal-semiconductor enables concurrent hydrogen evolution through photo-induced water splitting and RhB degradation by photo-oxidation in the visible range. This result is probably attributable to the formation of a heterojunction and the Pt nanoclusters in CN/Pt/TiO2, facilitating the electron transfer from the LUMO of g-C3N4 to that of TiO2 and generating different active sites upon photo-absorption in the CN layers. Our work provides a feasible way to obtain H-2 while treating sewage using photocatalysis.

机译：核壳g-C3N4 / Pt /二氧化钛纳米线结构通过一个简单成功合成两步合成方法,包括photodepositing Pt纳米粒子表面g-C3N4二氧化钛纳米线和后续发展通过热蒸发的尿素(CN)层。好CN/Pt/TiO2复合材料表现出高光电流密度CN/TiO2相比。CN/Pt/TiO2催化剂表现出增强的2进化速率为8.93μ摩尔h(1)下可见光辐照,高1.25倍比CN/TiO2(7.15μ摩尔h (1))Pt /二氧化钛和二氧化钛纳米线不显示任何可见光响应。CN/Pt/TiO2首次展示独特的核壳纳米线结构semiconductor-metal-semiconductor使并发氢进化通过photo-induced水分裂和RhB退化photo-oxidation的可见范围。结果可能是由于形成异质结和Pt纳米束CN/Pt/TiO2,促进电子转移的LUMO g-C3N4二氧化钛和产生不同的活跃网站photo-absorption CN层。提供了一种可行的方法来获得2使用光催化处理污水。

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来源
《Catalysis science & technology》 |2019年第18期|4898-4908|共11页
作者
Dou Hailong; Qin Yumei; Pan FengLong DanRao XiXu Guo QinZhang Yongping;
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Natl Univ Singapore, Dept Chem, 3 Sci Dr 3, Singapore 117543, Singapore;

Southwest Univ, Sch Mat & Energy, 2 Tiansheng Rd, Chongqing 400715, Peoples R China;

Peking Univ, Coll Chem & Mol Engn, 202 Chengfu Rd, Beijing 100871, Peoples R China;

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正文语种英语
中图分类汉语教学;
关键词
Thermal evaporation; Light irradiation; HeterojunctionsdeuteriumNanowireHydrogen evolutionVisible LightIrradiationelectron transferPhotocatalystsRedox processes;

机译：热蒸发;光辐照;Heterojuncti;

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Core-shell g-C3N4/Pt/TiO2 nanowires for simultaneous photocatalytic H-2 evolution and RhB degradation under visible light irradiation

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