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窄带隙铁酸铋的优化制备及其压电光催化性能

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针对光催化反应过程中光生电子与空穴复合率高、可见光谱吸收利用率低等问题，利用水热法合成具有较窄带隙的钙钛矿型铁酸铋(BiFeO3)。研究结果表明:在超声与光照的协同作用下，反应原料中NaOH浓度为8 mol/L时合成的BiFeO3样品的性能最佳，在15 min内对靛蓝胭脂红染料的降解率达97。6％，拟合得到的一级反应速率常数为0。203 6 min-1，其原因是其较窄的能带隙导致电子跃迁能量阈值较低。自由基捕获实验验证了压电光催化的反应机理，并验证了BiFeO3产生的压电场促进光催化反应进程的耦合效应。
Optimized construction of BiFeO3 with narrow bandgap and its piezo-photocatalytic activity
Perovskite bismuth ferrite(BiFeO3)with narrower bandgap was synthesized by a hydrothermal method in response to the problems of high recombination rate of photoelectrons and holes with low absorption efficiency of visible spectrum during photocatalytic process.The results show that the degradation rate of indigo carmine reaches 97.6％in 15 min of the best-performed BiFeO3 sample synthesized at a NaOH concentration of 8 mol/L under the synergic effect of ultrasound and illumination.The fitted first-order reaction rate constant is 0.203 6 min-1,which is attributed to its lower electron-leap energy threshold by narrower bandgap.The mechanism of piezo-photocatalysis is clarified by free radical trapping experiments and the synergistic effect that the piezoelectric field of BiFeO3 promotes the photocatalytic process is verified.

BiFeO3piezo-photocatalysiscoupling mechanismnarrow bandgapperovskite

衣秋燕、孙泽黎、赵艳、袁晰、罗行、张斗

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中南大学粉末冶金国家重点实验室,湖南长沙,410083

中南大学化学化工学院,湖南长沙,410083

铁酸铋 压电光催化 耦合机理 窄带隙 钙钛矿

国家重点研发计划项目湖南省科技创新计划项目国家自然科学基金资助项目National Key Research and Development Program of ChinaScience and Technology Innovation Program of Hunan Province

2020YFA07117022022RC102952102150

2024

10.11817/j.issn.1672-7207.2024.08.030

中南大学学报(自然科学版)
中南大学

中南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.938
ISSN：1672-7207
年,卷(期)：2024.55(8)