硫掺杂碳点/高锰酸盐工艺对DCF降解的协同效应:机理与途径。

Danmei Luo, Heng Zhang, Xingxing An, Jia Zhao, Can Feng, Jialong Yin, Mengfan Luo, Tao Wei, Yang Liu, Yanbiao Shi, Jing Zhang, Bo Lai
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引用次数: 0

摘要

广泛的研究已经探索了提高高锰酸盐(PM)氧化能力的策略,碳材料在处理水中难降解有机污染物方面显示出巨大的前景。然而,碳量子点(CQDs)和杂原子掺杂CQDs对PM氧化的影响尚不清楚,需要进一步研究。在本研究中,我们发现硫掺杂CQDs (SCQDs)在促进PM对双氯芬酸钠(DCF)的氧化反应方面明显优于CQDs、氮掺杂CQDs (NCQDs)和硼掺杂CQDs (BCQDs)。通过猝灭实验、遮光实验和UV-Vis光谱分析,我们发现PM/SCQDs体系可以快速稳定地生成Mn(III)和MnO2,从而促进DCF的去除。表征分析表明,SCQDs表面富含多种官能团,硫掺杂进一步增强了其电子云密度。这种结构特性增强了SCQDs向高锰酸盐提供电子的能力,从而促进其还原为Mn(III)和MnO2。对控制PM/SCQDs系统性能的关键操作参数进行了综合评估。此外,PM/SCQDs系统对普通基质离子和水中天然有机物的干扰具有很强的抵抗力。该研究为SCQDs促进高锰酸盐氧化提供了新的视角,为高效降解水污染物提供了一条有前景的途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Synergistic effects of sulfur-doped carbon dots/permanganate process for DCF degradation: Mechanism and pathways.

Synergistic effects of sulfur-doped carbon dots/permanganate process for DCF degradation: Mechanism and pathways.

Extensive research has explored strategies to enhance permanganate (PM) oxidation capacity, with carbon materials having shown significant promise in treating refractory organic pollutants in water. However, the impacts of carbon quantum dots (CQDs) and heteroatom-doped CQDs on PM oxidation remain unclear, warranting further investigation. In this study, we found that sulfur-doped CQDs (SCQDs) significantly outperformed CQDs, nitrogen-doped CQDs (NCQDs), and boron-doped CQDs (BCQDs) in promoting the oxidation reaction of diclofenac sodium (DCF) by PM. Through quenching experiments, light-shielding tests, and UV-Vis spectroscopy, we revealed that the PM/SCQDs system could rapidly and stably generate Mn(III) and MnO2, thereby facilitating the removal of DCF. Characterization analysis showed that SCQDs possess a surface enriched with diverse functional groups, and sulfur doping further enhances their electron cloud density. This structural characteristic enhances the ability of SCQDs to donate electrons to permanganate, thereby promoting its reduction to Mn(III) and MnO2. A comprehensive evaluation of key operational parameters governing the PM/SCQDs system performance was conducted. Additionally, the PM/SCQDs system exhibited substantial resistance to interference from common matrix ions and natural organic matter in water. The study provides a new perspective on enhancing permanganate oxidation by SCQDs and offers a promising pathway for efficient water pollutant degradation.

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