Chinese Journal of Catalysis ›› 2020, Vol. 41 ›› Issue (10): 1511-1521.DOI: 10.1016/S1872-2067(19)63525-4

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Significant role of carbonate radicals in tetracycline hydrochloride degradation based on solar light-driven TiO2-seashell composites: Removal and transformation pathways

Jiaqi Wanga, Qingrong Qiana, Qinghua Chena,b, Xin-Ping Liua, Yongjin Luoa, Hun Xuea, Zhaohui Lic   

  1. a College of Environmental Science and Engineering, Fujian Key Laboratory of Pollution Control&Resource Reuse, Fujian Normal University, Fuzhou 350007, Fujian, China;
    b Fuqing Branch of Fujian Normal University, Fuqing 350300, Fujian, China;
    c State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, Fujian, China
  • Received:2020-01-26 Revised:2020-03-03 Online:2020-10-18 Published:2020-08-15
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (21875037, 51502036), and the National Key R&D Program of China (2016YFB0302303).

Abstract: TiO2-seashell composites prepared via a sol-gel method were used to generate carbonate radicals (·CO3-) under solar light irradiation.·CO3-, a selective radical, was employed to degrade the target tetracycline hydrochloride contaminant. A series of characterizations was carried out to study the structure and composition of the synthesized TiO2-seashell composite. This material exhibits excellent solar light-driven photochemical activity in the decomposition of tetracycline hydrochloride. The possible pathway and mechanism for the photodegradation process were proposed on the basis of high-resolution electrospray ionization time-of-flight mass spectrometry experiments. Finally, we investigated the reusability of the TiO2-seashell composite. This study is expected to provide a new facile pathway for the application of·CO3- radicals to degrade special organic pollutants in water.

Key words: TiO2-seashell, Carbonate radical, Photochemistry, Tetracycline hydrochloride, Mechanism