Enhancing electron transfer by amorphous FeOOH quantum dots during photocatalytic ozonation of ibuprofen,Separation and Purification Technology

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Enhancing electron transfer by amorphous FeOOH quantum dots during photocatalytic ozonation of ibuprofen
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2024-12-20 , DOI: 10.1016/j.seppur.2024.131213
Yingjing Tian, Siyou Fu, Ping Li, Liying Bin, Bing Tang, Laisheng Li, Guanzheng Zhuang, Yunqiang Yi, Weirui Chen

Photocatalytic ozonation (PCO) process, as an effective water purification technology, was restrained by the low mass transfer and easy combination of photo-carriers (e_cb^--h_vb⁺) of conventional semiconductor catalysts. To these end, this study synthesized FeOOH quantum-dots (FeOOH QDs) and boosted the PCO activity by its amorphous structure with Ibuprofen (IBP) as model pollutant. 81.5 % IBP was removed by FeOOH QDs PCO, but it was 59.1 % and 61.2 % for α-FeOOH and β-FeOOH PCO, respectively. FeOOH QDs PCO performed well at alkaline environment but was easily inhibited by co-existing ions like SO₄^2-, HCO₃^–, NO₃^–, and Cl^-. Compared with those of α-FeOOH and β-FeOOH, FeOOH QDs had the narrowest band gap and the lowest e_cb^--h_vb⁺ recombination, therefore, its e_cb^- was more favorable to activate O₃ into •OH. Tetrahedral Fe³⁺ and octahedral Fe³⁺ co-existed on FeOOH QDs and the tetrahedral Fe³⁺ was more conducive to the adsorption of O₃ and contributed to its better PCO activity. •OH was the major reactive oxygen species accounting for IBP degradation. During FeOOH QDs PCO process, 3 degradation routes were proposed basing on 13 kinds by-products. T.E.S.T. result indicated that most of the intermediates were less toxic than IBP. This study is useful for developing catalysts for PCO process.

更新日期：2024-12-20

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