Chinese Journal of Catalysis ›› 2012, Vol. 33 ›› Issue (8): 1284-1289.DOI: 10.1016/S1872-2067(11)60392-6

• Research papers • Previous Articles     Next Articles

Catalytic Performance of Layered Double Hydroxides Co-Mn-Al for Ozonation of Organic Pollutants in Water

SUI Minghao*, DUAN Biaobiao, SHENG Li, HUANG Shuhang, SHE Lei   

  1. State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
  • Received:2012-03-14 Revised:2012-04-09 Online:2012-08-01 Published:2012-08-01

Abstract: 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.

Key words: layered double hydroxide, catalytic ozonation, nitrobenzene, tert-butanol, electron spin resonance, hydroxyl radical