Generation of singlet oxygen over CeO2/K, Na-codoped g-C3N4 for tetracycline hydrochloride degradation over a wide pH range. Issue 34 (4th August 2022)

• Record Type: Journal Article
• Authors: Zheng, Jianfei; Xu, Zhen; Xin, Sitian; Zhu, Bicheng; Nie, Longhui
• Is Part Of: Dalton transactions. Volume 51:Issue 34(2022)
• Page Start: 12883
• Page End: 12894
• Publication Date: 2022-08-04
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d2dt01748b
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : The singlet oxygen could be generated over a novel Fenton-like CeO2 /CN catalyst via Ce 4+ /Ce 3+ redox for the first time in dark and was utilized to efficiently degrade the emerging pollutant of TCH in a wide pH value (1.20–11.20). Abstract : Singlet oxygen ( 1 O2 ) species have been widely studied in catalytic oxidation and photodynamic therapy (PDT) and so on due to their unique properties, such as their long lifetime, wide pH tolerance, relative long migration distance, and high selectivity. In this work, 1 O2 could be generated over CeO2 /K, Na-codoped g-C3 N4 heterojunction (CeO2 /CN) fabricated using a molten salt method in the presence of H2 O2 in dark for the first time, which was used as a Fenton-like catalyst to degrade the emerging tetracycline hydrochloride (TCH) pollutant through a Fenton-like reaction. A significantly-enhanced catalytic activity was observed over CeO2 /CN compared with g-C3 N4 and commercial CeO2 . The Ce 4+ /Ce 3+ redox system was found to play a vital role in the formation of 1 O2 from the disproportionation of superoxide radical (˙O2 − ). The 1 O2 and ˙O2 − radicals were observed as the main active species in the highly-efficient degradation of TCH over a wide pH range (1.20–11.20). The strong interfacial interaction of CeO2 /CN promoted the Ce 4+ /Ce 3+ redox and the generation of active species. The catalytic mechanism of TCH decomposition was also proposed. This finding introduces an efficient and promising approach for the preparation of the highly-effective Fenton-like catalysts for water purification.