| 赤泥活化过一硫酸盐降解环丙沙星:性能和机制 |
| 摘要点击 1769 全文点击 646 投稿时间：2019-11-26 修订日期：2020-01-06 |
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| 中文关键词 赤泥(RM) 过一硫酸盐(PMS) 环丙沙星(CIP) 羟基自由基 降解路径 |
| 英文关键词 red mud(RM) peroxymonosulfate(PMS) ciprofloxacin(CIP) hydroxyl radical degradation pathway |
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| 中文摘要 |
| 为提高赤泥的综合利用及抗生素有机废水的深度处理，以赤泥（red mud，RM）为催化剂、环丙沙星（ciprofloxacin，CIP）为目标污染物，系统研究了RM活化过一硫酸盐（peroxymonosulfate，PMS）降解CIP的效果和机制.结果表明，含有Fe、Al和Ca等金属氧化物，具有较大比表面积（10.96 m2·g-1）和复杂孔道结构的RM能够有效增强PMS对CIP的降解速率和效果.自由基捕获剂甲醇、叔丁醇和苯酚的抑制实验结果进一步说明，体系产生的SO4-·和HO·在RM表面与CIP发生氧化反应.温度、PMS浓度和RM投加量影响CIP的降解.温度升高反应速度加快，反应活化能为5.74 kJ·mol-1； PMS浓度增加，体系产生更多SO4-·和HO·，CIP的降解率升高； RM存在最佳投加量1.0 g·L-1.HPLC/MS/MS共检测到8种降解产物，CIP分子中的哌嗪环易受活性物质进攻，CIP主要通过2种途径进行降解.本研究表明RM是一种极具潜力的廉价催化剂，可用于活化过一硫酸盐处理含抗生素的污染废水. |
| 英文摘要 |
| In this paper, the effects and mechanism of ciprofloxacin (CIP) degradation with peroxymonosulfate (PMS) catalyzed by solid waste red mud (RM) was firstly studied. The results indicated that RM has large specific surface area (10.96 m2·g-1) and complex pore structure, containing ferric, alumina and calcium oxide, which enhanced ciprofloxacin degradation by PMS effectively. Radical quenching experiments revealed that SO4-·and HO·were contributed to ciprofloxacin oxidation, and the reaction was mainly occurred on RM's surface. An increase in temperature could accelerate CIP degradation, and the corresponding reaction activation energy Ea was about 5.74 kJ·mol-1. Meanwhile, CIP degradation rate increased with PMS concentration and the optimal dosage of RM was 1.0 g·L-1. Eight degradation intermediates were identified using HPLC/MS/MS, and consequently, CIP was degraded mainly through two pathways; the piperazine groups were preferentially attacked by active free radicals. This study further indicated that RM is a cheap catalyst and can be potentially used in the treatment of antibiotic contaminated wastewater. |
