کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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59245 | 1419462 | 2012 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Catalytic Performance of Layered Double Hydroxides Co-Mn-Al for Ozonation of Organic Pollutants in Water Catalytic Performance of Layered Double Hydroxides Co-Mn-Al for Ozonation of Organic Pollutants in Water](/preview/png/59245.png)
The catalytic activity of layered double hydroxides containing Co, Mn, and Al for the ozonation of organic pollutants in water was investigated. The Co-Mn-Al layered double hydroxides were prepared by coprecipitation. Nitrobenzene was used as a model compound, and it was shown that the degradation and mineralization of nitrobenzene was increased by the presence of Co-Mn-Al layered double hydroxides as compared to ozonation alone. Both an indirect method of adding a scavenger (tert-butanol) of the hydroxyl radical chain reaction and direct electron spin resonance using 5,5-dimethyl-1-pyrroline-N-oxide as a spin trapping agent were used to investigate the generation of hydroxyl radicals in the ozonation by the Co-Mn-Al layered double hydroxides. The inhibiting effect of tert-butanol on the degradation of nitrobenzene and the detection of the stronger 5,5-dimethyl-1-pyrroline-N-oxide/hydroxyl radical adduct showed that the Co-Mn-Al layered double hydroxides catalyzed the generation of hydroxyl radicals.
摘要采用共沉淀法制备了 Co-Mn-Al 层状双氢氧化物, 并将其用于以硝基苯为目标污染物的催化臭氧降解反应中. 结果表明, Co-Mn-Al 层状双氢氧化物存在时, 硝基苯的降解和矿化效率较单独臭氧氧化系统显著提高. 采用加入羟基自由基捕获剂 (叔丁醇) 和电子顺磁共振检测 (5,5-二甲基-1-吡咯啉-N-氧化物为捕获剂) 的间接、直接方法, 探讨了 Co-Mn-Al 层状双氢氧化物是否强化了羟基自由基的生成. 结果表明, 加入叔丁醇降低了硝基苯的降解效率; 电子顺磁共振检出了更强的羟基自由基加成物生成信号. Co-Mn-Al 层状双氢氧化物的存在促进了羟基自由基的生成.
Co-Mn-Al layer doubled hydroxides catalyzed ozone decomposition to hydroxyl radicals, which then degraded organic pollutants in water.Figure optionsDownload as PowerPoint slide
Journal: Chinese Journal of Catalysis - Volume 33, Issues 7–8, July–August 2012, Pages 1284–1289