介孔二氧化锰制备及其催化臭氧氧化草酸研究

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张建琳,陈硕,全燮,于洪涛,张耀斌.介孔二氧化锰制备及其催化臭氧氧化草酸研究[J].,2017,57(5):447-452

介孔二氧化锰制备及其催化臭氧氧化草酸研究

Preparation of mesoporous MnO 2 for catalytic ozonation of oxalic acid

DOI：10.7511/dllgxb201705002

中文关键词:介孔二氧化锰催化臭氧氧化羟基自由基草酸

英文关键词:mesoporous MnO 2 catalytic ozonation hydroxyl radical oxalic acid

基金项目:国家自然科学基金资助项目(21590813).

作者	单位
张建琳,陈硕,全燮,于洪涛,张耀斌

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中文摘要:

采用纳米刻蚀法制备了介孔二氧化锰臭氧催化剂，并考察了其催化臭氧氧化降解草酸的性能．该催化剂高比表面积(142 m 2·g -1 )的有序纳米棒有利于催化剂活性位点的暴露和物质的吸附，从而增强了催化剂的催化活性．羟基自由基是催化臭氧氧化过程中产生的主要活性氧物种，该催化剂的羟基自由基产率是非介孔二氧化锰的2倍；朗缪尔吸附模型表明该催化剂对草酸的吸附能力是非介孔二氧化锰的9.42倍；该催化剂催化降解草酸的准一级反应动力学常数是非介孔二氧化锰的3倍．

英文摘要:

A mesoporous MnO 2 is prepared by the nanocasting method, and its performance as a catalyst for catalytic ozonation of oxalic acid is investigated. The ordered nanorods with high surface area (142 m 2·g -1 ) benefit the active sites exposition and the mass adsorption, thus enhance the efficiency of catalytic ozonation. In the catalytic ozonation, hydroxyl radical is identified as the main reactive oxygen species, and the productive rate of hydroxyl radical by the mesoporous MnO 2 is about 2 times as high as that by the non-mesoporous MnO 2. The adsorption capacity of oxalic acid by the mesoporous MnO 2 is 9.42 times as high as that by the non-mesoporous MnO 2 calculated by the Langmuir adsorption model. The pseudo first-order reaction kinetics constant of the catalytic ozonation of oxalic acid by the mesoporous MnO 2 is 3 times as much as that by the non-mesoporous MnO 2.

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介孔二氧化锰制备及其催化臭氧氧化草酸研究

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