Surface boric acid modification promoted Fe3+/Fe2+ cycle and H2O2 activation for facilitating Fenton degradation performance of Bi2Fe4O9

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2023-12, Vol.678, p.132477, Article 132477
• Main Authors: Dong, Jintao, Zou, Wenjuan, Liu, Gaopeng, Li, Lina, Ji, Mengxia, Wang, Bin, Liu, Pengjun, Li, Yingjie, Xia, Jiexiang, Li, Huaming
• Format: Article
• Language: English
• Subjects: Bi2Fe4O9; Fenton degradation; H2O2 activation; H3BO3 modification; Oxytetracycline
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2023.132477

Boric acid (H3BO3) modified Bi2Fe4O9 (H3BO3@Bi2Fe4O9, BBFO) materials were prepared by surface H3BO3 treatment on Bi2Fe4O9 (BFO) employing mechanical ball milling method. XPS analysis and FT-IR spectra demonstrates that H3BO3 was successfully fastened on BFO surface through intense friction and collision between mixed powder (H3BO3 and BFO) and abrasive. And EPR result illustrates that the more abundant oxygen vacancy (OVs) has been introduced into BFO surface in H3BO3 modification process. The Fenton degradation rate for oxytetracycline (OTC) of BBFO-2 materials reaches 75.0 % within 60 min, which is 21.8 % higher than that of BFO treated by ball milling process without H3BO3 modification (HBFO). And the H2O2 utilization rate (23.4 %) of BBFO-2 materials is higher than that of HBFO (7.6 %), which ascribes to the H3BO3 modification and the introduction of abundant OVs by the surface electrons accumulation and transfer for strengthening the Fe3+/Fe2+ cycle and H2O2 decomposition. The possible degradation pathways and Fenton reaction mechanism was speculated by ESR and HPLC-MS analysis. The manuscript provides a scientific reference and theoretical basis for investigating the preparation and enhancement mechanism of surface modification strategy for Fe-based Fenton catalysts. [Display omitted]