College of Environmental Science and Engineering, Hunan University, Changsha, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
Water Res. 2022 Aug 1;221:118797. doi: 10.1016/j.watres.2022.118797. Epub 2022 Jun 30.
The carbon-catalyzed persulfate-based advanced oxidation process (PS-AOP) has recently received much focus owing to the green, economical, and sustainable nature of carbon catalysts. In this study, sulfur-doped ordered mesoporous carbons (S-OMCs) were utilized to activate peroxydisulfate (PDS) for ciprofloxacin (CIP) removal. A synthesis temperature gradient was set to regulate the defect level of S-OMCs, since the thermal decomposition of oxygen- and sulfur-containing groups at different temperatures could release S and O and then create defects. In all S-OMCs/PDS systems, O dominated CIP degradation. Interestingly, a high linear correlation (R = 0.9091) between defect level and O yield was found, confirming the structure-activity relationship between defects and O generation. Moreover, the impacts of several important reaction conditions and water matrix on S-OMC-1000/PDS activation system were surveyed. In the S-OMC-1000/PDS activation system, CIP removal could attain 85.84% under the condition of unadjusted pH (pH = 5.3) and small amount of S-OMC-1000 (50 mg/L). The S-OMC-1000/PDS activation system also exhibited relatively stable or even better performance in the presence of common inorganic anions and natural organic matter (NOM), manifesting its good potential for practical applications. In addition, the reusability of S-OMC-1000 was investigated. This study provides a practical and high-efficiency way for decontaminating antibiotic-polluted water, and gives an alternative approach for identifying the active site of catalysts.
基于过硫酸盐的碳催化高级氧化工艺（PS-AOP）由于碳催化剂的绿色、经济和可持续性而受到广泛关注。本研究利用硫掺杂有序介孔碳（S-OMCs）活化过一硫酸盐（PDS）去除环丙沙星（CIP）。设置了一个合成温度梯度来调节 S-OMCs 的缺陷水平，因为在不同温度下含氧和含硫基团的热分解可以释放 S 和 O，从而产生缺陷。在所有 S-OMCs/PDS 体系中，O 主导着 CIP 的降解。有趣的是，发现缺陷水平和 O 产率之间存在高度线性相关（R = 0.9091），证实了缺陷与 O 生成之间的结构-活性关系。此外，还研究了几个重要的反应条件和水基质对 S-OMC-1000/PDS 活化系统的影响。在 S-OMC-1000/PDS 活化系统中，在未调节 pH（pH = 5.3）和少量 S-OMC-1000（50 mg/L）的条件下，CIP 去除率可达 85.84%。S-OMC-1000/PDS 活化系统在存在常见无机阴离子和天然有机物（NOM）的情况下也表现出相对稳定甚至更好的性能，显示出其在实际应用中的良好潜力。此外，还研究了 S-OMC-1000 的可重复使用性。本研究为处理抗生素污染水提供了一种实用且高效的方法，并为鉴定催化剂的活性位提供了一种替代方法。
