物理化学学报 >> 2026, Vol. 42 >> Issue (5): 100186.doi: 10.1016/j.actphy.2025.100186

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S型异质结Al6Si2O13/BiOBr通过增强电荷转移效应实现高效稳定光催化降解三唑磷和敌敌畏农药

孟奥运1, 李振华1, 熊国远1, 李真1,2,4,*(), 张金锋3,*()   

  1. 1 安徽科技学院食品科学与工程学院, 安徽 滁州 239000
    2 湖南文理学院水处理功能材料湖南省重点实验室, 湖南 常德 415000
    3 淮北师范大学物理与电子信息学院, 安徽 淮北 235000
    4 安徽科技学院功能农业与功能食品安徽省重点实验室, 安徽 滁州 239000
  • 收稿日期:2025-08-19 修回日期:2025-09-10 录用日期:2025-09-11 发布日期:2026-01-23
  • 通讯作者: Email: lizhen@ahstu.edu.cn Tel.: +86-17755030375 (李真)jfzhang@chnu.edu.cn Tel.: +86-13615611455 (张金锋)

S-scheme heterojunction Al6Si2O13/BiOBr with enhanced charge transfer effect for efficient and stable photocatalytic degradation of triazophos and dichlorvos pesticides

Aoyun Meng1, Zhenhua Li1, Guoyuan Xiong1, Zhen Li1,2,4,*(), Jinfeng Zhang3,*()   

  1. 1 College of Food Science and Engineering, Anhui Science and Technology University, Chuzhou 239000, Anhui Province, China
    2 Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan University of Arts and Science, Changde 415000, Hunan Province, China
    3 School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000, Anhui Province, China
    4 Anhui Province Key Laboratory of Functional Agriculture and Functional Food, Anhui Science and Technology University, Chuzhou, 239000, Anhui Province, China
  • Received:2025-08-19 Revised:2025-09-10 Accepted:2025-09-11 Published:2026-01-23
  • Contact: Email: lizhen@ahstu.edu.cn Tel.: +86-17755030375 (Zhen Li)jfzhang@chnu.edu.cn Tel.: +86-13615611455 (Jinfeng Zhang)

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摘要：

随着人们对农药污染的日益关注，尤其是在食品、谷物和肉类产品领域，寻找高效且稳定的光催化剂用于污染物降解成为一个重要研究方向。本研究成功合成了一种新型S型异质结光催化剂Al6Si2O13/BiOBr(ASO/BO)纳米复合材料，旨在增强电荷转移并提高对常见农业污染物三唑磷(TAP)和敌敌畏(DDVP)的光催化降解效率。性能评估表明，60-ASO/BO纳米复合材料(ASO负载比为60%)表现出卓越的降解效率，在100 min内将农药(TAP)浓度从100%降至28.0%，且在四次循环(400 min)后仍保持94.7%的初始活性。相比之下，单相ASO和BO的降解效率显著降低，分别仅为56.6%和58.8%。对于DDVP，该复合材料也展现出优异的光催化降解活性，在100 min内将其浓度从100%降至32.3%，远优于ASO(100%至67.8%)和BO(100%至47.9%)。这一卓越性能归因于S-scheme异质结结构所带来的增强电荷转移效应。通过飞秒瞬态吸收光谱(fs-TAS)、吸附能理论计算、差分电荷密度分析、开尔文探针力显微镜(KPFM)和原位X射线光电子能谱(XPS)进一步验证了电荷转移路径和机制。研究结果显示，S型电荷转移效应对于提升光催化性能至关重要。总体而言，ASO/BO的S型异质结为持久高效的光催化降解环境污染物提供了可靠途径，在农业、食品安全以及谷物和肉类产品保鲜领域具有广阔的应用前景。

关键词: 光催化剂, S型异质结, 纳米复合材料, 污染物, 电荷转移

Abstract:

Amidst growing concerns regarding pesticide contamination, particularly within the realms of food, grains, and meat products, the quest for highly efficient and stable photocatalysts for pollutant degradation has become an imperative area of research. In this study, a novel S-scheme heterojunction photocatalyst, Al6Si2O13/BiOBr (ASO/BO) nanocomposites, was successfully synthesized to enhance charge transfer and improve the photocatalytic degradation of Triazophos (TAP) and Dichlorvos (DDVP), prevalent agricultural pollutants. Performance evaluation revealed that the 60-ASO/BO nanocomposite (with 60% ASO loading ratio) achieved a remarkable degradation efficiency, reducing pesticide (TAP) concentration from 100% to 28.0% within 100 min, while retaining 94.7% of its initial activity after four cycles (400 min). In stark contrast, the degradation efficiencies of the individual ASO and BO were substantially lower, with ASO achieving 56.6% and BO merely 58.8%. For DDVP, the composite also exhibited excellent photocatalytic degradation activity, reducing its concentration from 100% to 32.3% within 100 min, far outperforming ASO (100% to 67.8%) and BO (100% to 47.9%). Enhanced charge migration within the S-scheme heterojunction accounts for the remarkable catalytic efficiency. The charge transfer pathway and mechanism were further validated using femtosecond transient absorption spectroscopy (fs-TAS), adsorption energy calculations, differential charge density analysis, Kelvin probe force microscopy (KPFM), and in situ X-ray photoelectron spectroscopy (XPS). The results emphasize that S-scheme charge migration is vital for enhancing photocatalytic performance. Consequently, the ASO/BO heterojunction based on the S-scheme provides a robust and reliable route for achieving durable and efficient photocatalytic removal of environmental contaminants, with broad application prospects in agriculture, food safety, and the preservation of grain and meat products.

Key words: Photocatalysts, S-scheme, Nanocomposites, Pollutants, Charge transfer