HCS@TiO2光催化复合材料的制备及其染料降解性能
Preparation and degradation dyestuffs performance of HCS@TiO2 photocatalytic composites
乔瑞泽 1侯斌 1林杰 1汪德昭 1高晓红1
作者信息
- 1. 南通大学 纺织服装学院,南通 226019
- 折叠
摘要
为了获得性能更加优异的光催化材料,本文通过简单的湿化学法制备了空心碳球(HCS)@TiO2 光催化复合材料,并对其进行了表征.形貌与结构的表征结果显示,TiO2 纳米颗粒均匀地锚定在HCS表面,形成亲水性强、比表面积大、热稳定性优异的球形复合材料,HCS@TiO2 复合材料中TiO2 的质量分数为80wt%;光电化学性质分析表明HCS@TiO2 复合材料禁带宽度更小,光响应范围更大,光生电子还原能力更强.在模拟太阳光下,以活性红 195(RR195)为实验对象,测试制备的HCS@TiO2 复合材料的光催化降解染料的性能和循环稳定性.结果表明:HCS@TiO2 光生电子空穴对的分离效率更高,光催化活性优异,在 120 min内染料降解率为 95.36%,5次循环后仍高达 93.34%,稳定性高,且易于回收.同时结合自由基捕获实验及电子顺磁共振光谱,对HCS@TiO2 光催化复合材料的光催化机制进行了探究,证实了·O2-在光催化反应体系中起主要作用.
Abstract
In order to obtain more efficient photocatalytic materials,hollow carbon sphere(HCS)@TiO2 photocata-lytic composites was prepared by a facile wet-chemical method and characterized.The results of struc-tural and morphology characterization showed that TiO2 nanoparticles were anchored uniformly on the surface of HCS,forming a spherical composites with high hydrophilia and specific surface area and excellent thermostability,the mass percentage of TiO2 anchored on HCS@TiO2 composites was 80wt%.The analysis of photoelectric chemical properties showed that HCS@TiO2 composites had smaller bandgap width,wider light response range,and stronger photogenic electron reduction ability.Using Reactive Red 195(RR195)as the experimental object,the photo-catalytic degradation dyes performance and cyclic stability of HCS@TiO2 composites were tested under simulated sunlight.The results show that the separation efficiency of photogenic electron hole pairs in the HCS@TiO2 is high-er,and the photocatalytic activity is excellent.The degradation rate is 95.36%within 120 min,and it still reaches 93.34%after 5 cycles,with high stability and easy recovery.At the same time,the photocatalytic mechanism of HCS@TiO2 photocatalytic composites was proposed by combining free radical capture experiment and electron paramagnetic resonance spectroscopy.It was confirmed that·O2- plays a major role in the photocatalytic reaction system.
关键词
湿化学法/二氧化钛/空心碳球/光催化/复合材料/降解/活性红195Key words
wet chemical method/titanium dioxide/hollow carbon spheres/photocatalytic/composites/de-gradation/Reactive Red 195引用本文复制引用
基金项目
江苏省大学生创新创业训练计划(202310304117Y)
江苏省青年基金(BK20210834)
出版年
2024
NETL
NSTL
万方数据