Enhanced peroxydisulfate activation by rGO/nZVI composites for efficient sulfamethoxazole degradation

IF 5.8 3区环境科学与生态学 0 ENVIRONMENTAL SCIENCES

Environmental Science and Pollution Research Pub Date : 2026-09-22 DOI:10.1007/s11356-026-38202-z

Honglei Fan, Zhengcai Sun, Kaixin Xuan, Yeqin Liu, Shaofeng Zhou, Jin Huang

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Abstract

A reduced graphene oxide-supported nanoscale zero-valent iron (rGO/nZVI) composite was fabricated via an in situ liquid-phase reduction and employed to activate peroxydisulfate (PDS) for sulfamethoxazole (SMX) degradation. Characterization results indicated that rGO incorporation improved the dispersion of nZVI and increased the specific surface area and pore volume of the composite. Under the optimized conditions, the rGO/nZVI/PDS system achieved > 98% SMX removal within 10 min. The apparent rate constant was 5.6 and 13.2 times higher than those of the nZVI/PDS and PDS-alone systems, respectively. Quenching experiments and EPR results suggested the involvement of singlet oxygen (¹O₂) in SMX degradation, whereas freely diffusing sulfate radicals and hydroxyl radicals were not the predominant reactive species under the tested conditions. The enhanced performance of rGO/nZVI may be associated with the improved dispersion of Fe-containing sites, increased accessibility of the composite surface, and possible changes in interfacial electron-transfer processes during PDS activation. This study demonstrates the potential of rGO-supported nZVI as a PDS activator for rapid SMX removal under the tested conditions.

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氧化石墨烯/nZVI复合材料对磺胺甲恶唑的高效降解增强过氧二硫酸盐活化。

通过原位液相还原制备了还原性氧化石墨烯负载的纳米级零价铁（rGO/nZVI）复合材料，并用于激活过硫酸氢盐（PDS）降解磺胺甲恶唑（SMX）。表征结果表明，rGO的加入改善了nZVI的分散，增加了复合材料的比表面积和孔体积。在优化的条件下，rGO/nZVI/PDS体系在10分钟内达到了98%的SMX去除率。表观速率常数分别是nZVI/PDS和单独PDS体系的5.6倍和13.2倍。猝灭实验和EPR结果表明，单线态氧（1O2）参与SMX的降解，而自由扩散的硫酸盐自由基和羟基自由基并不是SMX降解的主要活性物质。rGO/nZVI的性能增强可能与含铁位点的分散改善、复合表面的可接近性增加以及PDS活化过程中界面电子转移过程的可能变化有关。该研究证明了rgo支持的nZVI作为PDS活化剂在测试条件下快速去除SMX的潜力。

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

Environmental Science and Pollution Research 环境科学-环境科学

CiteScore

8.70

自引率

17.20%

发文量

6549

审稿时长

3.8 months

期刊介绍： Environmental Science and Pollution Research (ESPR) serves the international community in all areas of Environmental Science and related subjects with emphasis on chemical compounds. This includes: - Terrestrial Biology and Ecology - Aquatic Biology and Ecology - Atmospheric Chemistry - Environmental Microbiology/Biobased Energy Sources - Phytoremediation and Ecosystem Restoration - Environmental Analyses and Monitoring - Assessment of Risks and Interactions of Pollutants in the Environment - Conservation Biology and Sustainable Agriculture - Impact of Chemicals/Pollutants on Human and Animal Health It reports from a broad interdisciplinary outlook.