| g-C3N4-CdS-NiS2复合纳米管的制备及可见光催化分解水制氢 |
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| 引用本文： | 陈克龙,黄建花.g-C3N4-CdS-NiS2复合纳米管的制备及可见光催化分解水制氢[J].化工学报,2020,71(1):397-408. |
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| 作者姓名： | 陈克龙 黄建花 |
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| 作者单位： | 浙江理工大学化学系，浙江 杭州 310018 |
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| 摘 要： | 光生电子-空穴对的快速复合是导致半导体光催化剂性能不佳的重要因素之一，构建异质结是分离光生电子-空穴对的有效方法。结合热缩合和两步水热反应构建了g-C3N4-CdS-NiS2复合纳米管，并进一步研究了在可见光照射下不同CdS含量的g-C3N4-CdS-NiS2分解水制氢的光催化性能。结果表明，当CdS含量为10%(质量)时，三元复合物的产氢速率最高(50.9 μmol·h-1)，是纯g-C3N4纳米管的25倍，是g-C3N4-CdS和g-C3N4-NiS2二元复合物的11倍。而且，经过五次循环光催化反应后，产氢速率保持不变。光催化制氢性能的提高主要源于g-C3N4、CdS与NiS2形成的异质结促进光生电子和空穴的迁移及电子-空穴对的分离。
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| 关 键 词： | 制氢 催化 光化学 异质结 硫化镉 硫化镍 纳米管 可见光催化 g-C3N4 |
| 收稿时间： | 2019-10-23 |
| 修稿时间： | 2019-11-15 |
g-C3N4-CdS-NiS2 composite nanotube: synthesis and its photocatalytic activity for H2 generation under visible light |
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| CHEN Kelong,HUANG Jianhua.g-C3N4-CdS-NiS2 composite nanotube: synthesis and its photocatalytic activity for H2 generation under visible light[J].Journal of Chemical Industry and Engineering(China),2020,71(1):397-408. |
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| Authors: | CHEN Kelong HUANG Jianhua |
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| Affiliation: | Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, Zhejiang, China |
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| Abstract: | Rapid recombination of photogenerated electron-hole pairs is one of important factors leading to poor performance of semiconductor photocatalysts. Constructing a heterojunction is an effective method for separation of photogenerated electron-hole pairs. In the present work, g-C3N4-CdS-NiS2 composite nanotube was synthesized via thermal condensation using urea and thiourea as precursors, and subsequent two-step hydrothermal reactions. The photocatalytic activity of g-C3N4-CdS-NiS2 composite was investigated for H2 generation from water using triethanolamine as sacrificial agent under visible light irradiation. The optimal g-C3N4-CdS-NiS2 composite with the content of CdS 10%(mass) produced H2 at a rate of 50.9 μmol·h-1, which is 25 times and 11 times of that of pure g-C3N4 nanotube and g-C3N4-CdS (NiS2) binary composite, respectively. Moreover, cyclic photocatalytic experiments demonstrated the high stability of g-C3N4-CdS-NiS2 composite. The improvement in the photocatalytic performance for H2 production can be mainly attributed to the formation of heterojunction between CdS, NiS2 and g-C3N4 nanotubes, which is beneficial to the separation of photogenerated electron-hole pairs. |
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| Keywords: | hydrogen production catalysis photochemistry heterojunction cadmium sulfide nickel sulfide nanotube visible light catalysis g-C3N4 |
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