4.7 Article

Degradation of tetracycline hydrochloride by ultrafine TiO2 nanoparticles modified g-C3N4 heterojunction photocatalyst: Influencing factors, products and mechanism insight

Journal

CHINESE CHEMICAL LETTERS
Volume 33, Issue 3, Pages 1337-1342

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2021.08.008

Keywords

Photocatalytic; TiO2; G-C3N4; Tetracycline hydrochloride; Mechanism

Funding

  1. National Natural Science Foundation of China [52070107, 51678323]
  2. Natural Science Foundation of Shandong Province [ZR2019MD012, ZR2017MEE026]
  3. Support Plan on Youth Innovation Science and Technology for Higher Education of Shandong Province [2019KJD014]
  4. Natural Science Foundation of Heilongjiang Province [B2015024]

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In this study, a unique heterojunction photocatalyst of graphite carbon nitride modified ultrafine TiO2 was fabricated and its photocatalytic degradation performance for tetracycline hydrochloride (TC) was investigated. The effects of various environmental factors on the degradation process and the internal reaction mechanism were explored. The results showed that the photocatalyst exhibited high removal efficiency for TC and excellent anti-interference ability to ions in natural waters. The main reactive species for TC degradation were identified, and a possible mechanism for the photocatalytic system was proposed.
The unique heterojunction photocatalyst of graphite carbon nitride (g-C3N4) modified ultrafine TiO2 (g-C3N4/TiO2) was successfully fabricated by electrochemical etching and co-annealing method. However, the effects of various environmental factors on the degradation of TC by g-C3N4/TiO2 and the internal reaction mechanism are still unclear. In this study, the effects of initial pH, anions, and cations on the photocatalytic degradation of tetracycline hydrochloride (TC) by g-C3N4/TiO2 were systematically explored, and the scavenging experiment and intermediate detection were conducted to better reveal the mechanism on photocatalytic degradation of TC. The results showed that the removal efficiency of photocatalytic degradation of TC by g-C3N4/TiO2 could reach 99.04% under Xenon lamp irradiation within 120 min. The unique g-C3N4/TiO2 heterojunction photocatalyst showed excellent photocatalytic performance for the degradation of TC at pH 3 similar to 7, and possesses outstanding anti-interference ability to NO3-, Cl-, Na+, Ca2+ and Mg2+ ions in natural waters during the photocatalytic degradation TC process. Superoxide radicals (O-2(center dot-)) and hydroxyl radicals ((OH)-O-center dot) were proved as the main reactive species for TC degradation, and the possible mechanism of the unique photocatalytic system for g-C3N4/TiO2 was also proposed. The above results can provide a reliable basis and theoretical guidance for the design and application of visible photocatalyst with high activity to degrade the actual wastewater containing TC. (C) 2021 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

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