Enhanced visible-light-assisted peroxymonosulfate activation over MnFe2O4 modified g-C3N4/diatomite composite for bisphenol A degradation

• Published in: International journal of mining science and technology Vol. 31; no. 6; pp. 1169 - 1179
• Main Authors: Zhang, Xiangwei, Li, Chunquan, Chen, Ting, Tan, Ye, Liu, Xiaorui, Yuan, Fang, Zheng, Shuilin, Sun, Zhiming
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2021; Elsevier
• Subjects: Bisphenol A; Diatomite; g-C3N4; MnFe2O4; Peroxymonosulfate; Photocatalysis; g-C3N4; Bisphenol A; MnFe2O4; Diatomite; Peroxymonosulfate; Photocatalysis
• ISSN: 2095-2686
• DOI: 10.1016/j.ijmst.2021.11.008

The MnFe2O4/g-C3N4/diatomite composites (Mn/G/D) were prepared via a facile precipitation-calcination method in this study. The Mn/G/D possessed higher specific surface area, lower electron-hole pairs’ recombination rate, as well as wider and stronger visible light absorption capacity. Since the synergistic effect between g-C3N4 and MnFe2O4, the photogenerated electron could transfer from g-C3N4 to MnFe2O4, which could promote the migration of electrons as well as enhance the photocatalytic activity and peroxymonosulfate (PMS) activation efficiency. Mn/G/D-5% composite displayed the excellent degradation performance of bisphenol A (BPA) with the removal efficiency of 99.9% under PMS/Vis system, which was approximately 2.47 and 63.8 times as high as that of the Mn/G/D-5%/PMS and Mn/G/D-5%/Vis system, respectively. Moreover, negative electricity derived from diatomite surface also promoted the photogenerated carriers’ migration, and the degradation rate constant was around 2.4 times higher than that of MnFe2O4/g-C3N4 (Mn/G). In addition, quenching experiments showed that both radical pathway (h+, ·OH, ·O2− and SO4·−) and non-radical pathway (1O2) were responsible for the degradation of BPA.