内电场增强管状Z型In2O3/In2S3异质结的可控合成及光催化性能
Controllable synthesis and photocatalytic performance of Z-scheme In2O3/In2S3 tubular heterojunction with enhanced internal electric field
牛志睿 1彭欣悦 1王思雯 1李孝义 1雪文靖 1夏国珺 1袁淮钶1
作者信息
- 1. 延安大学 石油工程与环境工程学院,延安市农业固体废弃物资源化利用重点实验室,陕西 延安 716000
- 折叠
摘要
构建具有特殊形貌和增强内电场的异质结材料可以有效提高光催化剂的光生电子-空穴对的分离效率,从而提升光催化活性.采用两步溶剂热+热解可控合成了金属有机骨架(MOFs)衍生的Z型In2O3/In2S3异质结,利用表征分析、光催化降解实验对构建的异质结物相、形貌、光学特性和活性进行了系统研究.结果表明,管状形貌的In2O3/In2S3具有强的光吸收响应,在In2O3和In2S3界面处形成的强内电场抑制了光生电子-空穴对的复合.在可见光照射下,质量比1∶1的In2O3/In2S3表现出最优异的光催化活性,在60 min内对盐酸四环素(TCH)的降解率达到68.44%,反应动力学常数分别比In2O3和In2S3提高了29.8和3.2倍,经3次循环表现出良好的稳定性.电化学测试和自由基捕获试验表明,In2O3/In2S3异质结内电场强度相比In2O3和In2S3分别提高了3.89和2.42倍,超氧自由基(·O2-)和空穴(h+)是光催化过程中主要活性物质.该研究为强内电场异质结的高效光催化剂可控合成提供了一种有效策略.
Abstract
Constructing heterojunction materials with special morphology and enhanced internal electric field can effectively improve the separation efficiency of photogenerated electron-hole pairs in photocatalysts,thereby enhancing photocatalytic activity.The study used a two-step solvent thermal and calcination process to control the synthesis of Z-scheme In2O3/In2S3 heterojunctions derived from metal-organic frameworks(MOFs).Characterization analysis and photocatalytic degradation experiments were systematically conducted to study the phase,morphology,optical properties and performance of the constructed heterojunctions.The results showed that the tubular In2O3/In2S3 exhibited a strong light absorption response,and the strong internal electric field formed at the interface between In2O3 and In2S3 suppressed the recombination of photogenerated electron-hole pairs.Under visible light irradiation,the In2O3/In2S3 with a mass ratio of 1∶1 demonstrated the most excellent photocatalytic activity,achiev-ing a degradation rate of 68.44%for tetracycline hydrochloride(TCH)within 60 minutes.The reaction kinetic constants were increased by 29.8 times for In2O3 and 3.2 times for In2S3,and the In2O3/In2S3 showed good stability after three cycles.Electrochemical tests and radical trapping experiments indicated that the internal electric field intensity of the In2O3/In2S3 heterojunction was increased by 3.90 times for In2O3 and 2.42 times for In2S3,respectively,and superoxide radicals(·O2-)and holes(h+)were the main active substances in the photocatalytic process.The study provides an effective strategy for the controlled synthesis of high-efficiency photocatalysts with strong internal electric field heterojunctions.
关键词
光催化/MOFs衍生物/In2O3/In2S3/异质结/内电场Key words
photocatalysis/MOFs derivatives/In2O3/In2S3/heterojunction/internal electric field引用本文复制引用
基金项目
国家自然科学基金项目(21866031)
陕西省大学生创新训练项目(1150421014030)
出版年
2024
NETL
NSTL
万方数据