Mesoporous PdO/Bi2WO6: An outstanding step-scheme heterostructure for enhanced and accelerated visible-light-prompted reduction of nitrobenzene

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-06-07 DOI:10.1016/j.materresbull.2025.113609

Reda M. Mohamed , Fatehy M. Abdel-Haleem , Tamer M. Khedr , Faisal K. Algethami

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Abstract

Transforming highly hazardous nitrobenzene (NTr) into aniline (ANi), an industrially valuable substance, is considerably challenging. In this study, Bi₂WO₆ (BW) with mesoporous character was manufactured through a facile soft-template-mediated sol-gel methodology. PdO nanoparticles (NPs) with different amounts were then evenly spread on the BW surface using a method of imbibition and calcination, creating heterojunction PdO/BW step (S)-scheme catalytic substances. The as-fabricated catalytic substances were scrutinized via several advanced techniques and then evaluated through PCr of NTr under visible light. Exhaustive characterization demonstrated a tight interfacial coupling between BW and PdO, and effective S-scheme charge mobility in the heterostructure system. Moreover, the as-fabricated heterojunction catalysts exhibited a nanoplate-like morphology with a mesoporous nature and relatively significant surface area. Electrochemical and optical examinations unveiled superb capability to harvest visible light and demonstrated promoted light-generated charge carrier separation abilities for the heterojunctions compared to bare BW. Therefore, the composite catalytic substances demonstrated superior efficacy than bare BW towards PCr of NTr. Specifically, the photocatalyst 1.0 % PdO/BW could completely transform of NTr into ANi within only 40 min of visible light illumination. This promising heterojunction displayed an enhanced rate constant of 0.0608 min^–1, outperforming that achieved on bare BW by about 2.8 times. Our innovative heterojunction demonstrated exceptional stability and recyclability for up to five successive runs without a remarkable reduction in photocatalytic efficacy. This contribution presents new horizons for manufacturing S-scheme heterojunctions with boosted photocatalytic abilities, opening the way for prospective improvements in a broad range of significant applications.

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介孔PdO/Bi2WO6：一种增强和加速可见光催化硝基苯还原的杰出阶梯异质结构

将高度危险的硝基苯（NTr）转化为苯胺（ANi）是一种具有工业价值的物质，具有相当大的挑战性。本研究通过软模板介导的溶胶-凝胶方法制备了具有介孔特性的Bi2WO6 （BW）。采用渗吸和煅烧的方法，将不同量的PdO纳米颗粒（NPs）均匀分布在BW表面，形成PdO/BW异质结阶梯(S)方案催化物质。通过几种先进的技术对制备的催化物质进行了仔细检查，然后在可见光下通过NTr的PCr进行了评估。详尽的表征表明BW和PdO之间具有紧密的界面耦合，并且在异质结构体系中具有有效的S-scheme电荷迁移率。此外，制备的异质结催化剂具有纳米板状的介孔性质和相对较大的表面积。电化学和光学测试表明，与裸BW相比，异质结具有出色的可见光捕获能力，并证明了光产生的电荷载流子分离能力。因此，复合催化物质对NTr的PCr效果优于纯BW。其中，1.0% PdO/BW光催化剂在可见光照射下仅40 min即可将NTr完全转化为ANi。该异质结的速率常数为0.0608 min-1，比裸BW的速率常数提高了约2.8倍。我们的创新异质结表现出卓越的稳定性和可回收性，可连续运行五次，而不会显著降低光催化效率。这一贡献为制造具有增强光催化能力的S-scheme异质结提供了新的视野，为广泛的重要应用的前瞻性改进开辟了道路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.