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马建锋教授课题组在“Ceramics International ”上发表研究论文

   发布时间: 2019-06-04    访问次数: 13

Spinel-type cobalt-manganese oxide catalyst for degradation of Orange II using a novel heterogeneous photo-chemical catalysis system

Ni Qingzhuo   Ma Jianfeng   Fan Changhai   Kong Yong   Peng Mingguo   Komarneni Sridhar   

Abstract:A spinel-type Co-Mn oxide was designed and synthesized through a two-step oxidation-precipitation method at modest temperatures. The Co-Mn oxide was applied as the catalyst in the presence of NaHSO3 under visible light irradiation in order to establish the superiority of heterogeneous photo-chemical catalysis system. In the above system, the Co-Mn catalyst exhibited much better catalytic capability than that in either single photocatalysis or chemocatalysis system, implying that the Co-Mn catalyst could well combine photocatalysis and chemocatalysis to obtain the highest degradation eciency of up to 94% within 40min when using Orange II as the target pollutant. Recycling experiments results showed that the as-obtained catalyst has excellent stability and recyclability. Powder X-ray diraction (XRD) analysis showed that the as-obtained Co-Mn catalyst had a cubic MnCo2O4.5 spinel structure. Because of relatively low temperature (180) synthesis, the catalyst was formed with nanoparticles (2565nm) and high specic surface area as conrmed by SEM and BET analyses. XPS indicated the presence of both manganese and cobalt species that serve as reactive sites for the catalytic oxidation reactions. Rational degradation mechanisms responsible for superior catalytic activity and durability were proposedbased on a series ofexperimental results. The active species such as Mn(III), holes and sulfate and hydroxyl radicals were proposed to be responsible for the outstanding degradation results.