Developing efficient and metal-free catalytic oxidation systems based on PMS activation has become an increasingly important and challenging objective in the environmental catalysis field. In this study, iodine doped carbon fibers (I-CFs), as a low-cost and environmentally-friendly metal-free catalyst, were used for the activation of peroxymonosulfate (PMS), with the innovative construction of a simple and efficient I-CFs/PMS catalytic system. In this system, I-CFs exhibited extra-high catalytic activity to activate PMS for the removal of Acid Red 1 (AR1) over a wide pH range of 3–10, with a remarkably pH-tolerant performance. Electron paramagnetic resonance (EPR) technology with various spin-trapping agents, such as ascorbic acid, methyl alcohol and L-histidine, was employed to confirm that singlet oxygen (¹O₂) was the key radical species contributing to AR1 removal in the catalytic oxidation system, which is different from the widely reported radical pathway for PMS. Furthermore, the I-CFs/PMS system showed excellent anti-interference performance for the removal of AR1 when dye auxiliaries, such as NaCl, were added into the system, distinct from previous reports where NaCl can capture radicals and severely inhibit the decomposition of organic pollutants. The findings of this study provide a novel catalytic oxidation system for the activation of PMS, which could be potentially applied to environmental remediation.

中文翻译：

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掺杂碘的碳纤维可作为一种有效的无金属催化剂来活化过氧单硫酸盐以去除有机污染物†

开发基于PMS活化的高效，无金属的催化氧化系统已成为环境催化领域越来越重要且具有挑战性的目标。在这项研究中，使用碘掺杂的碳纤维（I-CFs）作为一种低成本且环保的无金属催化剂，通过简单有效的I- CFs / PMS催化系统。在该系统中，I-CF在3-10的宽pH范围内具有极高的催化活性，可激活PMS去除酸性红1（AR1），具有显着的pH耐受性能。采用电子顺磁共振（EPR）技术和各种自旋俘获剂（例如抗坏血酸，甲醇和L-组氨酸）来确认单重态氧（¹ O ₂）是催化氧化系统中AR1去除的关键自由基，这与广泛报道的PMS自由基途径不同。此外，I-CFs / PMS系统在将染料助剂（例如NaCl）添加到系统中时，对于去除AR1表现出出色的抗干扰性能，这与以前的报道不同，NaCl可以捕获自由基并严重抑制有机物的分解污染物。这项研究的发现为PMS的活化提供了一种新颖的催化氧化系统，可以潜在地应用于环境修复。