g-C3Nx@ZnxO异质催化剂的制备与可见光催化活性
Preparation and visible light photocatalytic activity of g-C3Nx@ZnxO heterojunction catalyst
李颖 1丁竹 1聂学童 1陶莹1
作者信息
- 1. 天津工业大学化学工程与技术学院,天津 300387
- 折叠
摘要
为了解决常规氧化锌光催化剂能带隙宽、量子产率低、稳定性差等缺陷,以g-C3Nx为基底、以ZnO作为金属源在g-C3Nx表面原位生长类沸石咪唑酯框架-8(ZIF-8),经高温煅烧后制得具有高稳定性和可见光催化活性的g-C3Nx@ZnxO异质催化剂;采用TEM、XRD、UV-DRS、瞬态光电流等测试方法对实验材料进行分析表征,并将g-C3Nx@ZnxO用于水环境中亚甲基蓝有机物的可见光催化降解.结果表明:g-C3Nx和ZIF-8的引入不仅使材料的光吸收能带隙变窄,而且显著提高了瞬态光电流响应信号,有效抑制了光生电子与空穴对的重组,从而增强了材料的光催化性能,g-C3Nx@ZnxO对亚甲基蓝的可见光降解率达到了 98.45％.
Abstract
In order to address the defects of conventional ZnO photocatalysts such as wide energy band gap,low quantum yield and poor stability,ZIF-8 was grown in situ on the surface of g-C3Nx with g-C3Nx as the substrate and ZnO as a metal source,and g-C3Nx@ZnxO heterogeneous catalysts with high stability and visible photocatalytic activity were fabricated after high temperature calcination.The experimental materials were characterized analytically us-ing TEM,XRD,UV-DRS,transient photocurrent and g-C3 Nx@ZnxO was used for the visible photocatalytic degradation of methylene blue organics in aqueous environment.The results show that the introduction of g-C3Nx and ZIF-8 leads to a narrowing of the optical absorption energy band gap,an enhancement of the transient pho-tocurrent response signal,and a reduction of the photogenerated electron-hole pairs in the material.The visible light degradation rate of methylene blue catalyzed by g-C3Nx@ZnxO reached 98.45％.
关键词
类石墨碳化氮/金属有机骨架材料/ZIF-8/可见光催化/有机污染物Key words
graphite-like nitrogen carbide/metal-organic frameworks/ZIF-8/visible light catalysis/organic pollutants引用本文复制引用
基金项目
国家自然科学基金资助项目(22078246)
天津市大学生创新训练计划项目(202210058051)
出版年
2024
国家科技期刊平台
NSTL
万方数据