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<p>Despite the preliminary successes of piezoelectric catalysis in environmental protection and biomedical fields, the challenge persists in manufacturing piezoelectric catalysts on a large scale that possesses both high degradation efficiency and affordability. In this work, 0.67BiFe<sub>0.98</sub>Al<sub>0.02</sub>O<sub>3</sub>-0.33BaTiO<sub>3</sub> (BFA0.02-BT) ceramic powders were used as the substrate material; then, g-C<sub>3</sub>N<sub>4</sub> and Cu were combined to prepare BFA<sub>0.02</sub>-BT/g-C<sub>3</sub>N<sub>4</sub>/Cu Ⅱ-type heterojunction piezoelectric catalyst. The addition of g-C<sub>3</sub>N<sub>4</sub> enhanced the optical band gap from 2.17 to 2.41&#xa0;eV, and Cu loading increased both the electron density of the heterostructure and the highly reactive ·O<sub>2</sub><sup>−</sup>. Furthermore, a maximum inverse piezoelectric constant <i>d</i><sub>33</sub>* = 99.5&#xa0;pm/V as well as a phase reversal hysteresis loop of approximately 180° were observed in 3BFA<sub>0.02</sub>-BT/2&#xa0;g-C<sub>3</sub>N<sub>4</sub>/3.8Cu, reflecting the good piezoelectric characteristic. The increased reactive ·O<sub>2</sub><sup>−</sup>, higher carrier concentration, and the suitable band gap contributed to the excellent catalytic activity. The synergistic effect of piezoelectric and integrated heterojunction promoted the effective separation of photo-generated charges, as well as restrained of the recombination of holes and electrons. The degradation rate (<i>k</i>) of 3BFA<sub>0.02</sub>-BT/2&#xa0;g-C<sub>3</sub>N<sub>4</sub>/3.8Cu composites against rhodamine B (RhB) dye, levofloxacin (Lev), and oxytetracycline (OTc) antibiotics was 0.47&#xa0;min<sup>−1</sup>, 0.08&#xa0;min<sup>−1</sup> and 0.02&#xa0;min<sup>−1</sup>, which was more than three times higher than that of reported BFO-based catalyst. This work presented a piezoelectric catalyst with high degradation efficiency, which was expected to be applied to the pollution of organic substances and antibiotics.</p>

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The degradation mechanism of BiFe0.98Al0.02O3-BaTiO3/g-C3N4/Cu II-type heterojunction induced by synergistic effect of piezoelectric and illuminant

  • 期刊论文

  • 发表日期：

    2026年5月5日

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  • Yunjing Shi,
  • Xu Wang,
  • Zhuo Su,
  • Yi Yao,
  • Xiaoyu Dong,
  • Yongtao Fan,
  • Jiwei Zhai

摘要

Despite the preliminary successes of piezoelectric catalysis in environmental protection and biomedical fields, the challenge persists in manufacturing piezoelectric catalysts on a large scale that possesses both high degradation efficiency and affordability. In this work, 0.67BiFe0.98Al0.02O3-0.33BaTiO3 (BFA0.02-BT) ceramic powders were used as the substrate material; then, g-C3N4 and Cu were combined to prepare BFA0.02-BT/g-C3N4/Cu Ⅱ-type heterojunction piezoelectric catalyst. The addition of g-C3N4 enhanced the optical band gap from 2.17 to 2.41 eV, and Cu loading increased both the electron density of the heterostructure and the highly reactive ·O2−. Furthermore, a maximum inverse piezoelectric constant d33* = 99.5 pm/V as well as a phase reversal hysteresis loop of approximately 180° were observed in 3BFA0.02-BT/2 g-C3N4/3.8Cu, reflecting the good piezoelectric characteristic. The increased reactive ·O2−, higher carrier concentration, and the suitable band gap contributed to the excellent catalytic activity. The synergistic effect of piezoelectric and integrated heterojunction promoted the effective separation of photo-generated charges, as well as restrained of the recombination of holes and electrons. The degradation rate (k) of 3BFA0.02-BT/2 g-C3N4/3.8Cu composites against rhodamine B (RhB) dye, levofloxacin (Lev), and oxytetracycline (OTc) antibiotics was 0.47 min−1, 0.08 min−1 and 0.02 min−1, which was more than three times higher than that of reported BFO-based catalyst. This work presented a piezoelectric catalyst with high degradation efficiency, which was expected to be applied to the pollution of organic substances and antibiotics.