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)@TiO_(2)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,TiO_(2)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@TiO_(2)复合材料中TiO2的质量分数为80wt%;光电化学性质分析表明HCS@TiO_(2)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@TiO_(2)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@TiO_(2)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@TiO_(2)光催化复合材料的光催化机制进行了探究,证实了·O_(2)^(-)在光催化反应体系中起主要作用。
In order to obtain more efficient photocatalytic materials,hollow carbon sphere(HCS)@TiO_(2)photocata-lytic composites was prepared by a facile wet-chemical method and characterized.The results of struc-tural and morphology characterization showed that TiO_(2)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 TiO_(2)anchored on HCS@TiO_(2)composites was 80wt%.The analysis of photoelectric chemical properties showed that HCS@TiO_(2)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@TiO_(2)composites were tested under simulated sunlight.The results show that the separation efficiency of photogenic electron hole pairs in the HCS@TiO_(2)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@TiO_(2)photocatalytic composites was proposed by combining free radical capture experiment and electron paramagnetic resonance spectroscopy.It was confirmed that O_(2)^(-)plays a major role in the photocatalytic reaction svstem.
作者
乔瑞泽
侯斌
林杰
汪德昭
高晓红
QIAO Ruize;HOU Bin;LIN Jie;WANG Dezhao;GAO Xiaohong(School of Textile and Clothing,Nantong University,Nantong 226019,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2024年第5期2534-2545,共12页
Acta Materiae Compositae Sinica
基金
江苏省大学生创新创业训练计划项目(202310304117Y)
江苏省青年基金(BK20210834)。
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195
wet chemical method
titanium dioxide
hollow carbon spheres
photocatalytic
composites
de-gradation
Reactive Red 195
