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<p>This study elucidates the piezo-photocatalytic degradation of methylene blue (MB) and perfluorooctane sulfonic acid (PFOS) using 50-KNbO<sub>3</sub>/BiOCl (50-KNO/BOC) heterojunction. Under artificial lighting (four UV C lamps, 8 W each) and magnetic stirring-induced piezo-assistance (stirring rate ~ 1000&#xa0;rpm), the Maximum removal reached 90.1% (rate constant, <i>k</i> = 0.0193&#xa0;min<sup>−1</sup>) for MB and 81.1% (<i>k</i> = 0.018&#xa0;min<sup>−1</sup>) for PFOS within 120&#xa0;min. The degradation mechanism can be illustrated as (1) the increase in the carrier Lifetime to 24.6&#xa0;ns in 50-KNO/BOC by forming an S-scheme heterojunction, and (2) the induced additional piezo-assistance reduced charge recombination. Furthermore, the scavenging studies have revealed dominance of <sup>.</sup>OH, h<sup>+</sup>, and <sup>.</sup>O<sub>2</sub><sup>−</sup> in MB removal. The degradation pathway begins with the demethylation of MB, eventually producing other metabolites and products of degradation. MB removal remained at 83.5% after four cycles of reusing 50-KNO/BOC, evidencing heterojunction’s stability. MB was completely removed within 120&#xa0;min under sunlight-induced piezo-photocatalysis. The energy consumption (EEO) was reduced to 213.43 kWh/m<sup>3</sup>/order compared with artificial Lighting conditions with EEO of 3715.33 kWh/m<sup>3</sup>/order.</p> Graphical Abstract <p></p>

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Enhancing photocatalytic degradation of organics: synergistic insights from piezo-assisted KNbO3/BiOCl S-scheme heterojunction

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Siva Sankari Jeyabalan,
  • Bandita Mainali,
  • Mathava Kumar

摘要

This study elucidates the piezo-photocatalytic degradation of methylene blue (MB) and perfluorooctane sulfonic acid (PFOS) using 50-KNbO3/BiOCl (50-KNO/BOC) heterojunction. Under artificial lighting (four UV C lamps, 8 W each) and magnetic stirring-induced piezo-assistance (stirring rate ~ 1000 rpm), the Maximum removal reached 90.1% (rate constant, k = 0.0193 min−1) for MB and 81.1% (k = 0.018 min−1) for PFOS within 120 min. The degradation mechanism can be illustrated as (1) the increase in the carrier Lifetime to 24.6 ns in 50-KNO/BOC by forming an S-scheme heterojunction, and (2) the induced additional piezo-assistance reduced charge recombination. Furthermore, the scavenging studies have revealed dominance of .OH, h+, and .O2− in MB removal. The degradation pathway begins with the demethylation of MB, eventually producing other metabolites and products of degradation. MB removal remained at 83.5% after four cycles of reusing 50-KNO/BOC, evidencing heterojunction’s stability. MB was completely removed within 120 min under sunlight-induced piezo-photocatalysis. The energy consumption (EEO) was reduced to 213.43 kWh/m3/order compared with artificial Lighting conditions with EEO of 3715.33 kWh/m3/order.

Graphical Abstract