| 纳米零价铜活化分子氧降解水中恩诺沙星 |
| 摘要点击 1909 全文点击 727 投稿时间：2018-03-30 修订日期：2018-06-24 |
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| 中文关键词 纳米零价铜(nZVC) 分子氧 降解 羟基自由基 恩诺沙星(ENR) |
| 英文关键词 nanoscale zero-valent copper(nZVC) molecular oxygen degradation hydroxyl radicals enrofloxacin(ENR) |
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| 中文摘要 |
| 采用纳米零价铜（nanoscale zero-valent copper，nZVC）活化分子氧对水中恩诺沙星（enrofloxacin，ENR）的去除进行了系统研究.通过表征可以发现，纳米铜粉比表面积高于微米级铜粉，无孔隙结构，表面粗糙且容易团聚.纳米级ZVC活化分子氧的性能明显优于微米级ZVC，这主要归因于其较大的比表面积，更容易被腐蚀.通过探究活化机制可以发现，活化分子氧产生的H2O2和表面腐蚀产生的Cu+构成了新型类Fenton体系，持续释放的羟基自由基是造成水中ENR高效去除的主导活性物种；同时，反应过程中产生的超氧自由基能够促进Cu2+还原成Cu+，从而加速ENR的去除过程.反应条件对nZVC活化分子氧降解ENR有一定的影响，较高的nZVC投加量、较低ENR浓度、较高的反应温度以及强酸性条件均有利于ENR的去除. |
| 英文摘要 |
| Systematically studied the oxidation of enrofloxacin (ENR) in a nanoscale zero-valent copper (nZVC)-activated molecular oxygen system. The results show that nanoscale copper powder has a higher surface area than microscale copper powder, non-porous structure, and rough surface and exists in form of agglomerates. Nanoscale ZVC shows a superior activated performance toward molecular oxygen compared with microscale ZVC, which is due to its larger specific area and the fact that it corrodes easier. The H2O2 generated from the activation of molecular oxygen and the Cu+ released from surface corrosion form a novel Fenton-like system in which hydroxyl radicals are continuously produced, resulting in high-efficiency removal of ENR from water. The superoxide radicals produced during the reaction promote the reduction of Cu2+ to Cu+, thus speeding up the removal of ENR. The reaction conditions have a certain effect on the ENR degradation in nZVC-activated molecular oxygen systems. A higher nZVC dosage, lower ENR concentration, higher reaction temperature, and strong acidic conditions are favorable for the ENR removal. |
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