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针对钒酸铋(BiVO4)光催化剂存在的载流子复合率高、表面反应动力学迟缓等问题，以球形BiVO4为基底，通过3种不同光化学还原方法(直接还原法、银氨配合物-还原法、溴化钾调控还原法)构建BiVO4@Ag-6%复合材料，系统探究不同负载方式对材料微观结构及光催化性能的影响。利用透射电子显微镜(TEM)、X射线光电子能谱(XPS)、X射线衍射(XRD)、紫外-可见漫反射光谱(UV-Vis DRS)以及电化学测试等对复合材料的结构和性质进行了系统表征。实验结果表明，通过溴化钾调控还原法制备的目标材料具有较好催化活性。这是由于利用AgBr配合物缓释Ag+机制，显著优化了Ag纳米颗粒(Ag NPs)的分散度及界面结合强度，其光催化降解Cr6+和罗丹明B(RhB)的活性最佳(Cr6+在20 min内完全降解，RhB降解效率较纯BiVO4提升明显)。结合表征分析，其优异性能归因于Ag NPs的等离子体共振效应(SPR)和肖特基势垒的协同作用，能够有效抑制载流子复合，并加速界面电荷传输。
Abstract：This study addressed the issues of high carrier recombination rates and sluggish surface reaction kinetics in bismuth vanadate(BiVO4) photocatalysts.Using spherical BiVO4 as the substrate, BiVO4@Ag-6% composite materials were constructed via three distinct photochemical reduction methods(direct reduction, silver-ammonia complex reduction, and potassium bromide-mediated reduction).The effects of different loading methods on the microstructure and photocatalytic performance of the materials were systematically investigated.The structure and properties of the composite materials were systematically characterized using transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD),ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis DRS),and electrochemical measurements.Experimental results indicated that the target material prepared via the potassium bromide-controlled reduction method exhibits superior catalytic activity.The AgBr complex-mediated Ag+ release mechanism significantly optimizes the dispersion and interfacial bonding strength of Ag nanoparticles(Ag NPs),resulting in optimal photocatalytic degradation activity for Cr6+ and Rhodamine B(RhB) with complete Cr6+ degradation within 20 min and a markedly enhanced RhB degradation efficiency compared to pure BiVO4.Characterization analysis attributes this superior performance to the synergistic effects of surface plasmon resonance(SPR) and the Schottky barrier in Ag NPs, which effectively suppressed carrier recombination and accelerate interfacial charge transport.
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基本信息:
DOI：10.13822/j.cnki.hxsj.2025.0253
中图分类号:O643.36;O644.1;TB33
引用信息:
[1]蔡旭鹏,王月荣,蔡依辰,等.构建高催化活性的BiVO_4@Ag复合材料[J].化学试剂,2026,48(01):28-35.DOI:10.13822/j.cnki.hxsj.2025.0253.
2025-12-11
2025-12-11
2025-12-11