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<p>As a widely used antibiotic, tetracycline (TC) is a prevalent aquatic contaminant. Its environmental persistence presents substantial ecological hazards and potential health risks. This research utilized an in situ hydrothermal technique to modify Bi<sub>2</sub>MoO<sub>6</sub> (BMO) with N-doped biochar (NBC), yielding a highly efficient photocatalyst. The photocatalytic efficacy of the manufactured materials in degrading TC under visible light was evaluated by characterizing its morphology and optical properties. Experimental findings demonstrated that the ideal mass ratio of NBC in the NBC/BMO composites was 20&#xa0;wt%. In 50&#xa0;mL of 40&#xa0;mg L<sup>−1</sup> TC solution, 0.2&#xa0;g of catalyst achieved an adsorption-photocatalytic efficiency of 86.1% after 60&#xa0;min of dark adsorption followed by 120&#xa0;min of photocatalytic treatment, which was 2.26 and 1.39 times greater than BMO and 20% BC/BMO, respectively. The adsorption kinetics conformed to a pseudo-second-order model, with a maximum adsorption capacity of 19.45&#xa0;mg g<sup>−1</sup>, signifying that chemical adsorption was the predominant process. The enhanced adsorption performance was attributed to N-doped effectively promoting the separation and migration of photogenerated electron–hole pairs, significantly reducing carrier recombination rates. Concurrently, the composites exhibited a pronounced visible light absorption red shift, regulating optical bandgap and markedly improving visible light utilization. Superoxide radicals (•O<sub>2</sub><sup>−</sup>) and holes (h<sup>+</sup>) were key active species in the photocatalytic degradation of TC. After five regeneration cycles, the composites maintained high removal efficiency for TC. This research not only provides a simple preparation method for N-doped BC photocatalysts but also offers an effective and low-cost strategy for utilizing biomass resources to remediate antibiotic-contaminated water bodies.</p> Graphical Abstract <p></p>

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The construction of novel Bi2MoO6 loaded N-biochar photocatalyst for improved removal of tetracycline

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Xiangqian Li,
  • Zhangying Chen,
  • Zilu Mao,
  • Dechao Wu,
  • Jiajun Li,
  • Huiying Chong,
  • Yelin Zeng,
  • Yonghong Wang,
  • Kuan Peng,
  • Yaohui Wu

摘要

As a widely used antibiotic, tetracycline (TC) is a prevalent aquatic contaminant. Its environmental persistence presents substantial ecological hazards and potential health risks. This research utilized an in situ hydrothermal technique to modify Bi2MoO6 (BMO) with N-doped biochar (NBC), yielding a highly efficient photocatalyst. The photocatalytic efficacy of the manufactured materials in degrading TC under visible light was evaluated by characterizing its morphology and optical properties. Experimental findings demonstrated that the ideal mass ratio of NBC in the NBC/BMO composites was 20 wt%. In 50 mL of 40 mg L−1 TC solution, 0.2 g of catalyst achieved an adsorption-photocatalytic efficiency of 86.1% after 60 min of dark adsorption followed by 120 min of photocatalytic treatment, which was 2.26 and 1.39 times greater than BMO and 20% BC/BMO, respectively. The adsorption kinetics conformed to a pseudo-second-order model, with a maximum adsorption capacity of 19.45 mg g−1, signifying that chemical adsorption was the predominant process. The enhanced adsorption performance was attributed to N-doped effectively promoting the separation and migration of photogenerated electron–hole pairs, significantly reducing carrier recombination rates. Concurrently, the composites exhibited a pronounced visible light absorption red shift, regulating optical bandgap and markedly improving visible light utilization. Superoxide radicals (•O2−) and holes (h+) were key active species in the photocatalytic degradation of TC. After five regeneration cycles, the composites maintained high removal efficiency for TC. This research not only provides a simple preparation method for N-doped BC photocatalysts but also offers an effective and low-cost strategy for utilizing biomass resources to remediate antibiotic-contaminated water bodies.

Graphical Abstract