| 纳米Cu0@Fe3O4活化PMS降解对-硝基苯酚的协同反应机制 |
| 摘要点击 1873 全文点击 827 投稿时间：2020-03-17 修订日期：2020-04-24 |
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| 中文关键词 Cu0@Fe3O4 活化过一硫酸盐 对-硝基苯酚(PNP) 非均相反应 协同修复 |
| 英文关键词 Cu0@Fe3O4 activate PMS p-nitrophenol(PNP) heterogeneous reaction collaborative remediation |
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| 中文摘要 |
| 为解决纳米Cu0活化过硫酸盐体系主要依赖浸出铜离子参与均相反应且适应pH范围窄（<7）的缺陷，本研究采用共沉淀法制备了纳米Cu0@Fe3O4催化剂，以对-硝基苯酚（PNP）为目标污染物，较系统地考察了Cu0@Fe3O4活化PMS的性能和降解PNP的反应机制.结果表明：① pH=5.65、200 mg ·L-1 Cu0@Fe3O4和0.5 mmol ·L-1 PMS在60 min内对5 mg ·L-1 PNP的降解率可达到96%；②在Cu0@Fe3O4/PMS体系中，总铜离子（TCu）和总亚铜离子（TCu+）以及铁离子浸出几乎可以忽略，可认为是非均相反应体系；③通过包覆Fe3O4成功改变了Cu0活化PMS降解PNP的反应途径，在5~9的pH范围内都具有良好的降解性能；④反应体系中存在SO-4 ·和HO ·两种活性自由基，对反应体系的贡献率分别为34%和60%，HO ·是主导自由基；⑤体系中Fe和Cu之间存在双金属协同作用，Cu（Ⅰ）的存在能够促进Fe（Ⅲ）还原为Fe（Ⅱ），从而形成良好的氧化还原循环，提高了反应体系的持久性. |
| 英文摘要 |
| A Cu0/PMS system mainly relies on the leaching of copper ions to degrade the pollutants and adapt to the narrow pH range (<7). To solve this defect, we studied the properties and reaction mechanism of Cu0@Fe3O4 magnetic core-shell material, which was successfully prepared using co-precipitation method, taking PNP as the target pollutant. The results showed that: ① a degradation rate of 96% can be achieved within 60 min for 5 mg ·L-1 PNP, 200 mg ·L-1 Cu0@Fe3O4, and 0.5 mmol ·L-1 PMS at a natural pH value (5.65); ② the Cu0@Fe3O4/PMS system can be regarded as a heterogeneous reaction system because TCu, TCu+, and iron leaching were almost negligible; ③ on comparing the performance of the Cu0@Fe3O4/PMS system and Cu0/PMS system in the pH range of 3 to 11, it was discovered that the method by which Cu0 activates the PMS to degrade the PNP was successfully changed by coating a layer of Fe3O4. The Cu0@Fe3O4/PMS system has a good degradation performance towards PNP in the pH range of 5-9; ④ SO-4 · and HO · existed in the reaction system, and their contribution rates to the reaction system were 34% and 60% ; HO · was the dominant free radical; ⑤ A bimetallic synergy exists between Fe and Cu. The presence of Cu(Ⅰ) can promote the reduction of Fe(Ⅲ) to Fe(Ⅱ), thereby forming a good redox cycle and improving the durability of the reaction system. |
