Piezo-Photocatalytic Technology Based on Bismuth Ferrite(Bi_(2)Fe_(4)O_(9))for Degradation of Reactive Dye KN-R  

基于铁酸铋(Bi_(2)Fe_(4)O_(9))的压电光催化技术降解活性染料KN-R

作　　者：ZHU Feishi HU Chunyan LIU Baojiang 朱飞狮;胡春艳;刘保江(东华大学生态纺织教育部重点实验室,上海201620;东华大学化学与化工学院,上海201620)

机构地区：[1]Key Laboratory of Science and Technology of Eco-Textile,Ministry of Education,Donghua University,Shanghai 201620,China [2]College of Chemistry and Chemical Engineering,Donghua University,Shanghai 201620,China

出　　处：《Journal of Donghua University(English Edition)》2025年第1期1-11,共11页东华大学学报(英文版)

摘　　要：Dyeing wastewater poses a serious threat to environmental protection and industrial development.The piezoelectric effect can be used to optimize the band structure of semiconductors and improve the photon efficiency of photocatalysts.Bi_(2)Fe_(4)O_(9),a narrow gap semiconductor with piezoelectric effect,was prepared by a hydrothermal synthesis method for the degradation of reactive dye KN-R.The results show that the degradation efficiency of KN-R can be significantly improved by piezo-photocatalysis,and the degradation rate constant of piezo-photocatalysis k_(pi-ph)is about 3.4 times as large as the degradation rate constant of piezoelectric catalysis k_(pi)and about 2.6 times as large as the degradation rate constant of photocatalysis k_(ph).At a pH value of 3 and a lower KN-R mass concentration(60 mg/L),a higher degradation efficiency(98.5%)is achieved.CO_(3)^(2-)and cationic surfactant(CTAB)inhibit the degradation of KN-R.It is proved that the contributions of different active species to the degradation of KN-R follow the order:·OH,·O_(2)^(-),h^(+),and^(1)O_(2).The possible mechanism of piezo-photocatalytic degradation of KN-R was discussed.The photoexcitation generates a large amount of free charges,and the piezoelectric effect modulates the energy band structure of Bi_(2)Fe_(4)O_(9)and promotes the separation of photogenerated electron-hole pairs.The synergistic effect of the two factors significantly improves the degradation efficiency of KN-R.印染废水对环境保护和工业发展构成严重威胁。压电效应可以用来优化半导体的能带结构,提高光催化剂的光子效率。该研究采用水热合成方法制备了具有压电效应的窄间隙半导体Bi_(2)Fe_(4)O_(9),用于降解染色废水中的活性染料KN-R。研究结果表明,Bi_(2)Fe_(4)O_(9)压电光催化能够显著提高降解KN-R的效率。压电光催化降解速率常数k_(pi-ph)分别约为压电催化降解速率常数k_(pi)和光催化降解速率常数k_(ph)的3.4倍和2.6倍。当pH值为3且KN-R质量浓度较低(60 mg/L)时,降解效率高(98.5%)。CO_(3)^(2-)和阳离子表面活性剂(CTAB)会抑制KN-R的降解。活性物种类对降解KN-R的贡献程度依次为:·OH,·O_(2)^(-),h^(+),^(1)O_(2)。可能的压电光催化降解机理为光激发产生大量的自由电荷,压电效应调节了Bi_(2)Fe_(4)O_(9)的能带结构并促进了光生电子空穴对的分离,两者协同作用显著提高了KN-R的降解效率。

关 键 词：Bi_(2)Fe_(4)O_(9) piezo-photocatalysis DEGRADATION wastewater treatment reactive dye KN-R 

分 类 号：X52[环境科学与工程—环境工程]