Photocatalytic degradation of tetracycline hydrochloride with visible light-responsive bismuth tungstate/conjugated microporous polymer

doi:10.1016/j.cjche.2021.08.030

Abstract

Abstract: Conjugated microporous polymer (CMP) is an emerging organic semiconductor with p-conjugated skeletons, and the bandgap of CMP can be flexibly modulated to harvest visible light. Based on the diversity and adjustability of monomers in CMP, we designed and synthesized donor-accepter (D-A) type BTNCMP through Sonogashira-Hagihara cross-coupling polymerization, further in-situ constructing series of inorganic/organic Z-scheme BW/BTN-n composite in the presence of Bi₂WO₆. After optimization, the tetracycline hydrochloride (C₀ = 10 mg·L^-1) degradation efficiency reached 84% with BW/BTN-2 as catalyst in 90 min under visible light irradiation, the apparent rate constant k₁ is 0.017 min^-1, which is 1.7 and 5.7 times higher than bare Bi₂WO₆ and BTN-CMP. X-ray photoelectron spectra and UV–Vis diffuse spectra showed that the enhanced photocatalytic activity originated from the tight heterojunction between Bi₂WO₆ and BTN-CMP, which can extend the light absorption range and facilitate the separation and transport of photogenerated charges in the interface of heterojunction. The active species trapping experiments and electron spin resonance technique revealed that h⁺ was the dominant active species during the photodegradation process of tetracycline hydrochloride (TCH). The present study demonstrated the feasibility to construct inorganic/organic composite for the photocatalytic degradation of environmental pollutants.

Key words: Photochemistry, Degradation, Visible light response, Pollution, Inorganic/organic heterojunction composite

摘要： Conjugated microporous polymer (CMP) is an emerging organic semiconductor with p-conjugated skeletons, and the bandgap of CMP can be flexibly modulated to harvest visible light. Based on the diversity and adjustability of monomers in CMP, we designed and synthesized donor-accepter (D-A) type BTNCMP through Sonogashira-Hagihara cross-coupling polymerization, further in-situ constructing series of inorganic/organic Z-scheme BW/BTN-n composite in the presence of Bi₂WO₆. After optimization, the tetracycline hydrochloride (C₀ = 10 mg·L^-1) degradation efficiency reached 84% with BW/BTN-2 as catalyst in 90 min under visible light irradiation, the apparent rate constant k₁ is 0.017 min^-1, which is 1.7 and 5.7 times higher than bare Bi₂WO₆ and BTN-CMP. X-ray photoelectron spectra and UV–Vis diffuse spectra showed that the enhanced photocatalytic activity originated from the tight heterojunction between Bi₂WO₆ and BTN-CMP, which can extend the light absorption range and facilitate the separation and transport of photogenerated charges in the interface of heterojunction. The active species trapping experiments and electron spin resonance technique revealed that h⁺ was the dominant active species during the photodegradation process of tetracycline hydrochloride (TCH). The present study demonstrated the feasibility to construct inorganic/organic composite for the photocatalytic degradation of environmental pollutants.

关键词: Photochemistry, Degradation, Visible light response, Pollution, Inorganic/organic heterojunction composite

Fenghongkang Pan, Yimeng Wang, Kaiqing Zhao, Jun Hu, Honglai Liu, Ying Hu. Photocatalytic degradation of tetracycline hydrochloride with visible light-responsive bismuth tungstate/conjugated microporous polymer[J]. Chinese Journal of Chemical Engineering, 2022, 41(1): 488-496.

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