Scholarlink

<p>Herein, a novel NiWO<sub>4</sub>/ZnFe<sub>2</sub>O<sub>4</sub> (NW/ZF) S-scheme heterojunction was fabricated via a precipitation–thermal treatment route and investigated for solar-light-driven photocatalysis, antibacterial performance and hydrogen evaluation. Structural analysis (XRD, FTIR, SEM, and EDX) of NW/ZF confirmed the formation of a well-defined heterointerface, while UV–Vis DRS and PL studies revealed a narrowed band gap (3.07&#xa0;eV) and reduced charge-carrier recombination compared to pristine ZnFe<sub>2</sub>O<sub>4</sub> (3.19&#xa0;eV) and NiWO<sub>4</sub> (3.30&#xa0;eV). The band edge positions (E<sub>CB</sub> = − 0.23&#xa0;eV for ZF; E<sub>VB</sub> = 3.43&#xa0;eV for NW validated the S-scheme configuration, enabling strong redox potentials for radical generation. Under solar irradiation, the NW<sub>20</sub>/ZF exhibited 99% BG degradation within 50&#xa0;min, with <i>k</i><sub>app</sub> value of 0.0928&#xa0;min⁻¹, nearly fourfold higher than pristine ZF. The supporting role of SO<sub>4</sub><sup>•−</sup>, h⁺, and O<sub>2</sub><sup>•−</sup> as the primery species for dye mineralization was further confirmed by the radical quenching experiments. The photocatalyst maintained ca. &gt;93% efficiency after five cycles, indicating high photostability. Antibacterial tests against <i>Aeromonas hydrophila</i> revealed concentration-dependent inhibition zones, reaching 8.33 ± 0.58&#xa0;mm at 100&#xa0;mg of catalyst. Synergistic enhancement was achieved upon coupling with PMS, attributed to the additional generation of SO₄<sup>•−</sup> species. The NW<sub>20</sub>/ZF shows 70 µmol.h<sup>− 1</sup> photocatalytic hydrogen production activity higher than NW<sub>10</sub>/ZF (33 µmol.h<sup>− 1</sup>), NW<sub>30</sub>/ZF (68 µmol.h<sup>− 1</sup>) and NW<sub>40</sub>/ZF (59 µmol.h<sup>− 1</sup>). This study establishes NiWO<sub>4</sub>/ZnFe<sub>2</sub>O<sub>4</sub> S-scheme heterojunctions as multifunctional photocatalysts with efficient solar-driven charge separation, high redox activity, and multiple applicability in dye remediation, microbial disinfection and hydrogen production.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Novel NiWO4/ZnFe2O4 based S-Scheme heterojunction for solar light assisted degradation of brilliant green dye and sustainable hydrogen production

  • 期刊论文

  • 发表日期：

    2026年5月20日

查看全文
  • Zafran Ud Din,
  • Burhan Ud Din,
  • Noor ul Akbar,
  • Faiza Rehman,
  • Saima Noreen,
  • Juan Zhang,
  • Murtaza Sayed

摘要

Herein, a novel NiWO4/ZnFe2O4 (NW/ZF) S-scheme heterojunction was fabricated via a precipitation–thermal treatment route and investigated for solar-light-driven photocatalysis, antibacterial performance and hydrogen evaluation. Structural analysis (XRD, FTIR, SEM, and EDX) of NW/ZF confirmed the formation of a well-defined heterointerface, while UV–Vis DRS and PL studies revealed a narrowed band gap (3.07 eV) and reduced charge-carrier recombination compared to pristine ZnFe2O4 (3.19 eV) and NiWO4 (3.30 eV). The band edge positions (ECB = − 0.23 eV for ZF; EVB = 3.43 eV for NW validated the S-scheme configuration, enabling strong redox potentials for radical generation. Under solar irradiation, the NW20/ZF exhibited 99% BG degradation within 50 min, with kapp value of 0.0928 min⁻¹, nearly fourfold higher than pristine ZF. The supporting role of SO4•−, h⁺, and O2•− as the primery species for dye mineralization was further confirmed by the radical quenching experiments. The photocatalyst maintained ca. >93% efficiency after five cycles, indicating high photostability. Antibacterial tests against Aeromonas hydrophila revealed concentration-dependent inhibition zones, reaching 8.33 ± 0.58 mm at 100 mg of catalyst. Synergistic enhancement was achieved upon coupling with PMS, attributed to the additional generation of SO₄•− species. The NW20/ZF shows 70 µmol.h− 1 photocatalytic hydrogen production activity higher than NW10/ZF (33 µmol.h− 1), NW30/ZF (68 µmol.h− 1) and NW40/ZF (59 µmol.h− 1). This study establishes NiWO4/ZnFe2O4 S-scheme heterojunctions as multifunctional photocatalysts with efficient solar-driven charge separation, high redox activity, and multiple applicability in dye remediation, microbial disinfection and hydrogen production.

Graphical Abstract