Promoted visible-light driven photoreduction of mercuric ions over hydrothermally synthesized platinum oxide-supported zinc tungstate hierarchical nanospheres

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2025-09-13 DOI:10.1016/j.mseb.2025.118800

Najah Ayad Alshammari , Ahmed Ashour , A.A. Baoum , Ahmed Shawky , Reda M. Mohamed

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Abstract

This study demonstrates improved photoreduction of mercuric ions (Hg²⁺) using hydrothermally synthesized hierarchical zinc tungstate (ZnWO₄) nanospheres that are subsequently supported with platinum oxide (PtO) nanoparticles. The PtO nanoparticles were integrated into ZnWO₄ at concentrations ranging from 0.3 to 1.2 wt% via impregnation. The resulting PtO/ZnWO₄ heterojunctions unveiled mesoporous textures with high surface areas (130–141 m² g⁻¹). Notably, the 0.9 wt% PtO-impregnated ZnWO₄ specimen showed improved visible light absorption due bandgap reduction to 2.35 eV, compared to 3.24 eV for pristine ZnWO₄. Under optimal conditions, the 0.9 % PtO/ZnWO₄ photocatalyst achieved comprehensive photoreduction of 368.30 µM Hg²⁺ using of 2.4 g L^–1 dose, giving an initial reduction rate of 23.57 µM min⁻¹ within 50 min of visible light irradiation. Furthermore, this optimized photocatalyst demonstrated recyclability, retaining 96 % of its initial performance after five cycles. The exceptional activity of PtO/ZnWO₄ is ascribed to enhanced visible light harvesting and efficient charge separation, facilitated by the controlled impregnation of PtO.

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在水热合成的氧化铂负载的钨酸锌层状纳米球上促进可见光驱动的汞离子光还原

本研究证明了利用水热合成的分层钨酸锌（ZnWO4）纳米球，随后用氧化铂（PtO）纳米球负载，可以改善汞离子（Hg2+）的光还原。通过浸渍将PtO纳米颗粒以0.3 ~ 1.2 wt%的浓度整合到ZnWO4中。由此得到的PtO/ZnWO4异质结揭示了具有高表面积（130-141 m2 g−1）的介孔结构。值得注意的是，与原始ZnWO4的3.24 eV相比，0.9 wt% pto浸渍ZnWO4样品的带隙减小到2.35 eV，从而提高了可见光吸收。在最佳条件下，0.9% PtO/ZnWO4光催化剂在2.4 g L-1的剂量下，在可见光照射50 min内实现了368.30µM Hg2+的全面光还原，初始还原速率为23.57µM min−1。此外，这种优化的光催化剂具有可回收性，在5次循环后仍能保持96%的初始性能。PtO/ZnWO4的特殊活性归因于PtO的可控浸渍增强了可见光捕获和有效的电荷分离。

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.