Mechanistic insights into plasmon-mediated charge transfer in Pt@BiOBr/g-C3N4 S-scheme heterojunction for solar-driven water treatment

IF 6.7 2区 工程技术 Q1 ENGINEERING, CHEMICAL
Jin Chen , Ke Li , Jie Yan , Suqing Qin , Yuzhao Ma , Xiaofeng Yang , Yanjun Li
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Abstract

Designing heterojunction photocatalysts with staggered band structures and optimal interfacial interactions constitutes a feasible strategy to achieve superior photocatalytic performance. Herein, we synthesized a Pt@BiOBr/g-C3N4 S-scheme heterojunction via in-situ construction and photochemical deposition. Notably, Platinum nanoparticles (NPs), precisely deposited via photochemical reduction, extend light absorption into the visible-NIR spectrum through localized surface plasmon resonance (SPR) while acting as electron mediators to suppress recombination. Under simulated solar irradiation, the optimized Pt@BiOBr/g-C3N4 S-scheme heterojunction demonstrates complete degradation of tetracycline hydrochloride (TC-HCl) within 10 min. Additionally, the photocatalyst showed exceptional degradation efficiency for organic dyes including methyl orange (MO) and rhodamine B (RhB). More importantly, the synergistic interplay between internal electric field (IEF) and the SPR of Pt nanoparticles collectively facilitates rapid charge separation while suppressing electron-hole recombination. This study offers a path toward highly effective photocatalysts engineered for practical applications and elucidates the activity enhancement mechanism through Pt incorporation in ternary heterojunction systems.

Abstract Image

太阳能驱动水处理中Pt@BiOBr/g-C3N4 S-scheme异质结等离子体介导的电荷转移机制
设计具有交错带结构和最佳界面相互作用的异质结光催化剂是实现优异光催化性能的可行策略。本文通过原位构建和光化学沉积的方法合成了Pt@BiOBr/g-C3N4 S-scheme异质结。值得注意的是,通过光化学还原精确沉积的铂纳米颗粒(NPs)通过局部表面等离子体共振(SPR)将光吸收扩展到可见-近红外光谱,同时作为电子介质抑制重组。在模拟太阳照射下,优化后的Pt@BiOBr/g-C3N4 s型异质结能在10 min内完全降解盐酸四环素(TC-HCl)。此外,该光催化剂对甲基橙(MO)和罗丹明B (RhB)等有机染料表现出优异的降解效率。更重要的是,内部电场(IEF)和Pt纳米粒子的SPR之间的协同相互作用共同促进了电荷的快速分离,同时抑制了电子-空穴的复合。本研究为实际应用的高效光催化剂提供了一条途径,并阐明了通过在三元异质结体系中掺入Pt来增强活性的机制。
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来源期刊
Journal of water process engineering
Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology
CiteScore
10.70
自引率
8.60%
发文量
846
审稿时长
24 days
期刊介绍: The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies
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