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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_2Fe_4O9, 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 piezophotocatalysis, and the degradation rate constant of piezophotocatalysis kpi-phis about 3. 4 times as large as the degradation rate constant of piezoelectric catalysis kpiand about 2. 6 times as large as the degradation rate constant of photocatalysis kph. At a pH value of 3 and a lower KN-R mass concentration(60 mg/L), a higher degradation efficiency(98. 5%) is achieved. CO32-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, ·O2~-, h+,and ~1O2. 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_2Fe_4O9 and promotes the separation of photogenerated electron-hole pairs. The synergistic effect of the two factors significantly improves the degradation efficiency of KN-R.
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Basic Information:
DOI：10.19884/j.1672-5220.202404008
China Classification Code:X703;O643.36
Citation Information:
[1]ZHU Feishi,HU Chunyan,LIU Baojiang.Piezo-Photocatalytic Technology Based on Bismuth Ferrite (Bi_2Fe_4O_9) for Degradation of Reactive Dye KN-R[J].Journal of Donghua University (English Edition),2025,42(01):1-11.DOI:10.19884/j.1672-5220.202404008.