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<p>The development of heterojunctions by combining more than one semiconductor of different band gap values is an appropriate approach to yield reinforced photocatalysis treatment. In this work, a bismuth oxychloride composite of BiOCl/Bi<sub>12</sub>O<sub>17</sub>Cl<sub>2</sub> with Z-type phase junction has been constructed via facile hydrothermal assembly anchored with multi-walled carbon nanotubes (MWCNT). The XRD and FT-IR confirm the phase purity and chemical groups of BiOCl/Bi<sub>12</sub>O<sub>17</sub>Cl<sub>2</sub>/MWCNT. The anchoring of MWCNT upgraded the surface area from 8.102&#xa0;to 30.475 m<sup>2</sup>/g, increasing the active sites for pollutant degradation. Compared with single BiOCl and Bi<sub>12</sub>O<sub>17</sub>Cl<sub>2</sub> photocatalysts, the photoresponsivity of BiOCl/Bi<sub>12</sub>O<sub>17</sub>Cl<sub>2</sub><b>/</b>MWCNT was considerably extended to visible light regions. Synergistically, the BiOCl/Bi<sub>12</sub>O<sub>17</sub>Cl<sub>2</sub><b>/</b>MWCNT ternary heterojunction showed higher oxytetracycline (OTC) photodegradation efficiency (94.7% in 50&#xa0;min) under LED light. Further, the reaction rates were 5.42, 4.74, 6.09, and 2.13 times higher than BiOCl, Bi<sub>12</sub>O<sub>17</sub>Cl<sub>2</sub>, MWCNT, and BiOCl/Bi<sub>12</sub>O<sub>17</sub>Cl<sub>2</sub>, respectively. Besides, BiOCl/Bi<sub>12</sub>O<sub>17</sub>Cl<sub>2</sub>/MWCNT showed renewable OTC (69.8% in 50&#xa0;min) under sunlight radiation. The ternary system maintained its powerful stability in six repeated cycles. The trapping tests revealed the major role of <sup>·</sup>O<sub>2</sub><sup>−</sup> in OTC reaction over BiOCl/Bi<sub>12</sub>O<sub>17</sub>Cl<sub>2</sub><b>/</b>MWCNT. Based on PL and EIS tests, the boosted photocatalytic efficiency of BiOCl/Bi<sub>12</sub>O<sub>17</sub>Cl<sub>2</sub><b>/</b>MWCNT was demonstrated to be credited to the efficient isolation of photo-excited electron/hole pairs as a result of the Z-type interface shaped between BiOCl and Bi<sub>12</sub>O<sub>17</sub>Cl<sub>2</sub> and the transport channels for electrons provided by MWCNT. This work may not only provide effective photocatalysis systems for environmental decontamination but also pave the way to construct robust Z-type bismuth oxychloride heterojunctions.</p>

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Synergistic Efforts of Z-scheme BiOCl/Bi12O17Cl2 Heterojunction Promoted by MWCNT for Boosted Photocatalytic Destruction of Oxytetracycline Under Solar Energy

  • 期刊论文

  • 发表日期：

    2025年1月14日

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  • Zaid H. Jabbar,
  • Bassim H. Graimed,
  • Ayah A. Okab,
  • Saad H. Ammar,
  • Ahmed Samir Naje,
  • Ali Majdi

摘要

The development of heterojunctions by combining more than one semiconductor of different band gap values is an appropriate approach to yield reinforced photocatalysis treatment. In this work, a bismuth oxychloride composite of BiOCl/Bi12O17Cl2 with Z-type phase junction has been constructed via facile hydrothermal assembly anchored with multi-walled carbon nanotubes (MWCNT). The XRD and FT-IR confirm the phase purity and chemical groups of BiOCl/Bi12O17Cl2/MWCNT. The anchoring of MWCNT upgraded the surface area from 8.102 to 30.475 m2/g, increasing the active sites for pollutant degradation. Compared with single BiOCl and Bi12O17Cl2 photocatalysts, the photoresponsivity of BiOCl/Bi12O17Cl2/MWCNT was considerably extended to visible light regions. Synergistically, the BiOCl/Bi12O17Cl2/MWCNT ternary heterojunction showed higher oxytetracycline (OTC) photodegradation efficiency (94.7% in 50 min) under LED light. Further, the reaction rates were 5.42, 4.74, 6.09, and 2.13 times higher than BiOCl, Bi12O17Cl2, MWCNT, and BiOCl/Bi12O17Cl2, respectively. Besides, BiOCl/Bi12O17Cl2/MWCNT showed renewable OTC (69.8% in 50 min) under sunlight radiation. The ternary system maintained its powerful stability in six repeated cycles. The trapping tests revealed the major role of ·O2− in OTC reaction over BiOCl/Bi12O17Cl2/MWCNT. Based on PL and EIS tests, the boosted photocatalytic efficiency of BiOCl/Bi12O17Cl2/MWCNT was demonstrated to be credited to the efficient isolation of photo-excited electron/hole pairs as a result of the Z-type interface shaped between BiOCl and Bi12O17Cl2 and the transport channels for electrons provided by MWCNT. This work may not only provide effective photocatalysis systems for environmental decontamination but also pave the way to construct robust Z-type bismuth oxychloride heterojunctions.