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<p>Photocatalysis presents great potential of eliminating antibiotics from water environment, however, the rapid charge carrier recombination greatly inhibits the removal efficiency. In this study, a p–n junction of Co<sub>3</sub>O<sub>4</sub>/TiO<sub>2</sub> with CNT ternary photocatalytic composite (CTC) was prepared via hydrothermal method, for the enhanced photodegradation of tetracycline (TC). The CTC composite eliminated 90.0% of TC (30&#xa0;mg/L) in 120&#xa0;min, which slightly dropped to 84.5% after six cycles. CNT inhibited the agglomeration of Co<sub>3</sub>O<sub>4</sub> and TiO<sub>2</sub> nanoparticles, and also enhanced charge carrier mobility. The p–n junction between Co<sub>3</sub>O<sub>4</sub> and TiO<sub>2</sub> effectively hindered the recombination of light-induced charge carriers. The water quality parameters including pH, inorganic anions (Cl<sup>−</sup>, NO<sub>3</sub><sup>–</sup>, CO<sub>3</sub><sup>2–</sup>) and humic acid were evaluated. The TC photodegradation mechanism was proposed, and the possible reaction pathways were explained. This work opened a new perspective for the practical application of p–n junction-based photocatalyst in wastewater treatment.</p>

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Co3O4/TiO2 p–n junction-decorated CNT for enhanced photocatalytic degradation of tetracycline

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Yan Chen

摘要

Photocatalysis presents great potential of eliminating antibiotics from water environment, however, the rapid charge carrier recombination greatly inhibits the removal efficiency. In this study, a p–n junction of Co3O4/TiO2 with CNT ternary photocatalytic composite (CTC) was prepared via hydrothermal method, for the enhanced photodegradation of tetracycline (TC). The CTC composite eliminated 90.0% of TC (30 mg/L) in 120 min, which slightly dropped to 84.5% after six cycles. CNT inhibited the agglomeration of Co3O4 and TiO2 nanoparticles, and also enhanced charge carrier mobility. The p–n junction between Co3O4 and TiO2 effectively hindered the recombination of light-induced charge carriers. The water quality parameters including pH, inorganic anions (Cl−, NO3–, CO32–) and humic acid were evaluated. The TC photodegradation mechanism was proposed, and the possible reaction pathways were explained. This work opened a new perspective for the practical application of p–n junction-based photocatalyst in wastewater treatment.