被撤回的出版物: Visible-light-induced photocatalytic mitigation of ibuprofen using magnetic black TiO2-x/CaFe2O4 decorated on diatomaceous earth (Retracted article. See vol. 777, 2021)

This study reports a facile preparation of black TiO2-x/CaFe2O4 (Ti3+ self-doped titania coupled with calcium ferrite), an efficient photocatalyst for ibuprofen (IBP) oxidation under visible light irradiation. Compared with TiO2-x or CaFe2O4, TiO2-x/CaFe2O4 heterojunction displayed better photo-oxidation performance, and their immobilization onto diatomaceous earth (DE) further increased the oxidation rate due to the adsorption ability of DE. The morphology, phase composition and other physicochemical properties of the composite were studied using different characterization methods. The effects of several parameters on IBP oxidation efficiency were studied, such as pH, IBP concentration, catalyst dosage, co-existing ions, microplastics and peroxymonosulfate (PMS). Quenching experiment results demonstrated the roles of the following reactive species: hydroxyl radical, photo-induced hole, sulfate radical and superoxide radical. The intermediates during IBP oxidation were determined by HPLC-MS method, and their acute toxicity was studied. Furthermore, the plausible reaction pathway and mechanism were proposed. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

This study presents a facile method for preparing black TiO2-x/CaFe2O4, an efficient photocatalyst for IBP oxidation under visible light irradiation, with enhanced oxidation rate when immobilized onto diatomaceous earth. The composite's properties were studied and the effects of various parameters on IBP oxidation efficiency were investigated.