薄荷碳点/TiO2复合光催化剂的制备及其性能研究
Study on preparation and photocatalytic performance of mint carbon dots/TiO2 composite photocatalyst
张英 1任旺 1郑兴文 1周慧眠 1瞿香 1李敏娇2
作者信息
- 1. 四川轻化工大学化学与环境工程学院,四川自贡 643000
- 2. 四川轻化工大学化学工程学院,四川自贡 643000
- 折叠
摘要
以薄荷粉为生物碳源,采用一步水热法成功制备出薄荷碳点/TiO2复合光催化剂.利用X射线衍射仪(XRD)、扫描电镜(SEM)、红外光谱(FT-IR)、孔隙比表面分析仪(BET)、表面光电压(SPS)对薄荷碳点/TiO2复合光催化剂的结构、形貌、比表面积及光生电荷分离特性进行了表征;考察了薄荷碳点/TiO2复合光催化剂对模拟污染物罗丹明B(RhB)的催化降解性能.结果表明,薄荷碳点改善了TiO2的光催化性能,超氧自由基·O2-是薄荷碳点/TiO2复合催化剂光催化降解反应中的主要活性自由基.与纯TiO2样品相比,2％薄荷碳点/TiO2的复合光催化剂的光生电子-空穴分离速率最高,对RhB表现出最好的脱色性能,光催化活性提高了2.24倍.
Abstract
In this study,mint powder was employed as biological carbon source to prepare mint carbon dots(mint-CDs)/TiO2 composite photocatalyst by a one-step hydrothermal method.The structure,mor-phology,specific surface area and photogenerated charges separation characteristics were carefully in-vestigated by X-ray diffraction(XRD),scanning electron microscopy(SEM),Fourier transform in-frared spectroscopy(FT-IR),Brunauer-Emmett-Teller(BET)method,and surface photo voltage spectro-scopy(SPS).Rhodamine B(RhB)was employed as model pollutant to study the photocatalytic activit-ies of mint-CDs/TiO2 photocatalysts.The results show that mint-CD improve the photocatalytic activity of TiO2,and superoxide free radical·O2-is the main active free radical in the photocatalytic degrada-tion reaction.When the mass ratio of mint-CDs/TiO2 is 2％,the composite photocatalyst demonstrates the maximum photogenerated charges separation efficiency and degradation activity for RhB,and the photocatalytic activity was increased by 2.24 times compared with reference TiO2.
关键词
复合光催化剂/TiO2/薄荷粉/水热法/降解性能Key words
composite photocatalyst/TiO2/mint powder/hydrothermal method/photocatalytic per-formance引用本文复制引用
基金项目
钒钛资源综合利用四川省重点实验室项目(2018FTSZ15)
钒钛资源综合利用四川省重点实验室项目(2020FTSZ04)
乡村低成本环境治理技术四川省高校重点实验室开放项目(XCH2022ZB-04)
四川轻化工大学大学生创新基金项目(S20221062209)
出版年
2024
国家科技期刊平台
NSTL
万方数据