| 氮掺杂生物炭催化臭氧对于布洛芬的降解特性与机制 |
| 摘要点击 3293 全文点击 1110 投稿时间：2021-06-02 修订日期：2021-07-14 |
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| 中文关键词 臭氧氧化 催化臭氧 氮掺杂生物炭 布洛芬(IBP) 超氧自由基(·O-2) |
| 英文关键词 ozone oxidation catalytic ozone nitrogen-doped biochar ibuprofen (IBP) superoxide radical(·O-2) |
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| 中文摘要 |
| 系统研究了新型氮掺杂生物炭材料（N-C）催化臭氧对于水中布洛芬（IBP）的氧化降解效能及机制，并深入探究了初始pH、臭氧投加量、催化剂投加量、不同阴离子和背景水质条件对IBP降解效率的影响.结果表明，相较于一些常见的碳基催化剂（g-C3N4、生物炭、颗粒活性炭）及金属催化剂（MnO2、Fe3O4），N-C催化臭氧体系具有十分突出的有机污染物氧化降解性能，反应5 min对于IBP的去除率高达100%，并且能将臭氧利用率从10%提高到46%.该体系的处理效率随pH的升高而增强，相比于提高臭氧投加量，增大催化剂的浓度可以显著提高系统的处理能力.通过淬灭实验和EPR进一步证实了N-C可有效催化臭氧产生更多活性氧，如超氧自由基（·O2-）和H2O2等，同时发现·O2-是该反应体系中主要的活性物质，对于IBP的降解起主导作用. |
| 英文摘要 |
| This study used a novel nitrogen-doped biochar (N-C) to catalyze the oxidative degradation of IBP in water by ozone and studied the catalytic ozone oxidation degradation of ibuprofen (IBP) efficiency and mechanism. Furthermore, it explored the influence of pH, ozone dosing quantity, catalyst dosing quantity, different anions, and background of water quality conditions on the IBP degradation efficiency. The results showed that, compared with that of some common carbon-based catalysts (g-C3N4, biochar, and granular-activated carbon) and metal catalysts (MnO2 and Fe3O4), the N-C catalytic ozone system had a very outstanding oxidation degradation performance of organic pollutants; the removal rate of IBP reached 100% in 5 min, and the utilization rate of ozone was increased from 10% to 46%. The treatment efficiency of the system was enhanced with the increase in pH. Compared with that by increasing the ozone dosage, the treatment capacity of the system was significantly improved by increasing the concentration of catalyst. The quenching experiment and EPR further confirmed that N-C could effectively catalyze ozone to produce more reactive oxygen species, such as superoxide radicals (·O2-) and H2O2. It was also found that·O2- was the main active substance in the reaction system and played a leading role in the degradation of IBP. |
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