Kaolinite based catalysts for efficient ozonation of recalcitrant organic chemicals in water 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Applied clay science
年/卷/期
2019 / 175 / Jul.
页码
159-168
ISSN号
0169-1317
作者单位
China Univ Petr, State Key Lab Petr Pollut Control, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China;China Univ Petr, State Key Lab Petr Pollut Control, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China;Univ Hawaii Manoa, Hawaii Nat Energy Inst, Honolulu, HI 96822 USA;China Univ Petr, State Key Lab Petr Pollut Control, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China;CNPC Res Inst Safety & Environm Technol, Beijing 102206, Peoples R China;Univ Hawaii Manoa, Dept Mol Biosci & Bioengn, Honolulu, HI 96822 USA;China Univ Petr, State Key Lab Petr Pollut Control, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China;China Univ Petr, State Key Lab Petr Pollut Control, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China;
作者
Ma, Wenfeng;Hu, Jingze;Yoza, Brandon A.;Wang, Qinghong;Zhang, Xiaofei;Li, Qing X.;Guo, Shaohui;Chen, Chunmao;
摘要
Kaolinite has been widely utilized as a raw material in industrial and agricultural fields. Kaolinite derived materials can be used as catalysts in a catalytic ozonation process (COP) of recalcitrant organic chemicals in wastewater with decreased costs and improved profitability. The silicon (Si), aluminum (Al) and oxygen (O) in layered silicate of kaolinite and amorphous aluminum silicate of metakaolinite contribute to the formation of catalytic active sites. Kaolinite contains surface OH groups, Si-O and Al-O structures that promote oxidation through the formation of hydroxyl radicals (center dot OHs) mineralizing the pollutant p-nitrophenol. Different metakaolinite has surface Si-O and Al-O structures that enhance mineralization through surface reaction. Catalytic ozonation of p-nitrophenol using kaolinite and metakaolinite increased the total organic carbon removal (46% and 41%, respectively) relative to single ozonation (32%). Introduction of Mn into kaolinite and metakaolinite further accelerate center dot OH generation, improving the catalytic activity. Among the catalysts, the highest activity was observed using Mn loaded kaolinite (TOC removal 66%). Its enhanced activity may be mainly attributed to cooperative interactions from the distributed Mn oxides (Mn2+, Mn3+, and Mn4+) and surface OH groups. This study introduces the potential application of kaolinite and metakaolinite for the treatment of recalcitrant chemical wastewaters in catalytic ozonation processes.
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关键词/主题词
Ozonation;Catalytic ozonation;Kaolinite;Metakaolinite;Wastewater treatment;
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