Influencing mechanism of bicarbonate on the catalytic ozonation of nitrobenzene in aqueous solution by ceramic honeycomb supported manganese

作者: Lei Zhao , Zhizhong Sun , Jun Ma , Huiling Liu

DOI: 10.1016/J.MOLCATA.2010.02.007

关键词: OzoneChemistryHydroxyl radicalAqueous solutionManganeseNitrobenzeneBicarbonateCatalysisInorganic chemistryHeterogeneous catalysis

摘要: Abstract The influence of bicarbonate on degradation efficiency nitrobenzene in aqueous solution by ceramic honeycomb supported manganese catalytic ozonation has been investigated. Under the lower concentration condition (25 and 50 mg L −1 ), enhances nitrobenzene, while presents inhibition effect at higher (100–250 mg L ). modification with Mn improves its resistibility to negative bicarbonate, also can be decreased, respectively increasing total applied ozone or amount catalyst. utilization increases (0–100 mg L formation H 2 O initiation hydroxyl radical ( OH) reach a maximum 75 , respectively. mechanism investigation suggests that plays an important role as promoter chain reactions accelerating mass transformation, causing ozone, OH concentration. Bicarbonate exerts due predominance derived from scavenging capacity OH.

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