化工新型材料

化工新型材料 ›› 2024, Vol. 52 ›› Issue (11) : 141-147. DOI: 10.19817/j.cnki.issn1006-3536.2024.11.017

科学研究

Ag/g-C₃N₄复合光催化剂的制备及其光解水产氢性能研究

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Preparation of Ag/g-C₃N₄ composite photocatalyst and its photocatalytic hydrogen production performance

Wang Rui¹, Fu Xiaonan¹, Guo Yefei², Zhang Jinfeng¹, Chen Rong¹, Shen Fanbo¹

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Received		Published
2023-09-11		2024-11-20
Issue Date	Revised Date
2024-11-19	2023-09-11

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摘要

通过光沉积法制备了银含量不同的银/石墨相氮化碳(Ag/g-C₃N₄)复合光催化剂。通过扫描电子显微镜、X射线衍射仪、X射线光电子能谱仪、紫外-可见漫反射光谱仪等对其表面形貌、结构、化学组成及光学性能进行了表征和测试。结果表明:Ag/g-C₃N₄复合光催化剂主要由不规则的大块颗粒和许多大小、形状不一的小颗粒组成;Ag纳米颗粒的引入没有改变g-C₃N₄的晶体结构,Ag纳米颗粒以零价金属形式存在;Ag/g-C₃N₄复合光催化剂紫外区光吸收性能显著提高;Ag纳米颗粒的引入有效地抑制了光生电子-空穴对的复合,同时也促进了电荷的迁移。光解水产氢实验表明,Ag含量不同的Ag/g-C₃N₄复合光催化剂的产氢速率相比于g-C₃N₄都明显提升,且1% Ag/g-C₃N₄的产氢速率最高,达到了636.71μmol/(g·h),是g-C₃N₄产氢速率的8.9倍。

Abstract

Silver/graphitic phase carbon nitride (Ag/g-C₃N₄) composite photocatalysts with different silver contents were prepared by photo-deposition.Their surface morphologies,structures,chemical compositions,and optical properties were characterized and tested by scanning electron microscopy,X-ray diffractometry,X-ray photoelectron spectrometry,and UV-Vis diffuse reflectance spectroscopy.The results showed that the Ag/g-C₃N₄ composite photocatalysts were mainly composed of irregular bulk particles and many small particles with different sizes and shapes.The crystal structure of g-C₃N₄ was not changed by the introduction of Ag nanoparticles,which existed in the form of zero-valent metal.The UV absorption properties of Ag/g-C₃N₄ composite photocatalysts were improved remarkably.the introduction of Ag nanoparticles effectively suppressed the recombination of photogenerated electron-hole pairs,and promoted the charge migration.The photocatalytic hydrogen production experiments showed that the hydrogen production rates of the Ag/g-C₃N₄ composite photocatalysts with different Ag contents were significantly improved compared with that of g-C₃N₄,and the hydrogen production rate of 1% Ag/g-C₃N₄ was the best,reaching 636.71μmol/(g·h),which was 8.9 times that of g-C₃N₄.

关键词

石墨相氮化碳 / 银纳米颗粒 / 光解水 / 产氢 / 催化剂

Key words

graphite phase carbon nitride / silver nanoparticle / water splitting / hydrogen production / catalyst

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Ag/g-C₃N₄复合光催化剂的制备及其光解水产氢性能研究[J]. 化工新型材料, 2024, 52(11): 141-147 DOI:10.19817/j.cnki.issn1006-3536.2024.11.017

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