Scholarlink

<p>The co-dependent challenges of environmental remediation and solar energy conversion necessitate the development of highly efficient, noble-metal-free photocatalytic systems, particularly those engineered to overcome rapid charge recombination while preserving high redox potential. Herein, we report the construction of an intimate PTA/Ni<sub>3</sub>V<sub>2</sub>O<sub>8</sub> (Phosphotungstic Acid/Nickel Vanadate) nanocomposite via a facile hydrothermal method, aiming to leverage the multi-electron redox properties of PTA as a highly efficient charge mediator. Structural and optical characterization confirmed the formation of a robust heterojunction with enhanced visible-light harvesting capabilities. Under simulated solar irradiation, the optimized PTA10/Ni<sub>3</sub>V<sub>2</sub>O<sub>8</sub> composite demonstrated remarkable dual-functional performance: achieving 94.4% degradation of Methylene Blue (MB) with a kinetic rate constant ~ 7.2-fold higher than that of pristine Ni<sub>3</sub>V<sub>2</sub>O<sub>8</sub>. Furthermore, the composite exhibited superior CO<sub>2</sub> photoreduction activity, doubling the yield of valuable liquid fuels (HCOOH and HCHO) in 6&#xa0;h. Detailed mechanistic analyses, encompassing photoluminescence (PL) spectroscopy and radical trapping experiments, validated the direct Z-scheme charge transfer mechanism. This pathway successfully spatialized charge carriers, confirmed by PL quenching, and preserved their potency, evidenced by the prevalence of highly oxidizing holes (h<sup>+</sup> on the PTA HOMO) and potent reducing species (<sup>•</sup>O<sub>2</sub><sup>-</sup> derived from the Ni<sub>3</sub>V<sub>2</sub>O<sub>8</sub> CB). This work establishes PTA as an effective interfacial promoter for vanadate-based materials, presenting a sustainable, high-performance Z-scheme composite for advanced environmental and energy applications.</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

Direct Z-scheme nickel vanadate/phosphotungstic acid nanocomposites for concurrent photocatalytic water purification and CO2 reduction

  • 期刊论文

  • 发表日期：

    2026年5月4日

查看全文
  • M. Abd Elnaby Wafi,
  • M. A. Ahmed,
  • Hesham A. A. Medien

摘要

The co-dependent challenges of environmental remediation and solar energy conversion necessitate the development of highly efficient, noble-metal-free photocatalytic systems, particularly those engineered to overcome rapid charge recombination while preserving high redox potential. Herein, we report the construction of an intimate PTA/Ni3V2O8 (Phosphotungstic Acid/Nickel Vanadate) nanocomposite via a facile hydrothermal method, aiming to leverage the multi-electron redox properties of PTA as a highly efficient charge mediator. Structural and optical characterization confirmed the formation of a robust heterojunction with enhanced visible-light harvesting capabilities. Under simulated solar irradiation, the optimized PTA10/Ni3V2O8 composite demonstrated remarkable dual-functional performance: achieving 94.4% degradation of Methylene Blue (MB) with a kinetic rate constant ~ 7.2-fold higher than that of pristine Ni3V2O8. Furthermore, the composite exhibited superior CO2 photoreduction activity, doubling the yield of valuable liquid fuels (HCOOH and HCHO) in 6 h. Detailed mechanistic analyses, encompassing photoluminescence (PL) spectroscopy and radical trapping experiments, validated the direct Z-scheme charge transfer mechanism. This pathway successfully spatialized charge carriers, confirmed by PL quenching, and preserved their potency, evidenced by the prevalence of highly oxidizing holes (h+ on the PTA HOMO) and potent reducing species (•O2- derived from the Ni3V2O8 CB). This work establishes PTA as an effective interfacial promoter for vanadate-based materials, presenting a sustainable, high-performance Z-scheme composite for advanced environmental and energy applications.

Graphical abstract