Fe-MnO_(x)催化臭氧氧化甲基橙的研究  

Ozonation of Methyl Orange Catalyzed by Fe-MnO_(x)

作　　者：柯武 KE Wu

机构地区：[1]中国市政工程西南设计研究总院有限公司,中国成都610213

出　　处：《西南给排水》2024年第1期38-43,共6页Southwest Water & Wastewater

摘　　要：实验以甲基橙为目标物,考察Fe-MnO_(x)的催化效果,同时比较不同燈烧温度(300℃、400℃、500℃、600℃和700℃)、Fe/Mn混合比例(Fe/Mn=1/3、Fe/Mn=1/1和Fe/Mn=1/3)等制备条件对催化剂活性的影响,力求得到催化剂的最佳制备条件。结果表明:在400℃,Fe/Mn=1:1的制备条件下,Fe-MnO_(x)催化剂对催化臭氧降解甲基橙表现出显著的催化活性,反应进行20min,甲基橙的去除率高达70.26%,较单独臭氧氧化提高了32.29%;加入叔丁醇(TBA)后,明显抑制甲基橙去除率,说明催化过程不仅存在羟基自由基反应机理,而且存在臭氧分子与吸附在催化剂表面的甲基橙直接反应的反应途径;为了进一步了解催化剂的催化活性和内部结构之间的内在关系,采用XPS、XRD、TEM和BET等检测技术对催化活性最好的Fe-MnO,催化剂进行表征。表征的结果显示:催化剂中存在Fe_(2)O_(3)、FeO(OH)、MnO_(2)和Mn_(5)O_(8),且催化剂结构呈不定晶型,结构疏散,表面孔隙多,比表面积高达117.81m^(2)/g。Methyl Orange was used as target for exploring the catalytic ability of Fe-MnO_(x).In the experiment,the factors of calcination temperature(300℃,400℃,500℃,600℃ and 700℃)and doping ratio of Fe/Mn(Fe/Mn=1/3,Fe/Mn=1/1 and Fe/Mn=1/3)were studying to determine the optimal catalyst preparation condition.The Fe-MnO_(x) with the highest catalytic ability was characterized by XPS,XRD,SEM and BET.The result showed that Fe-MnO_(x),prepared under the conditions of 400℃ calcination temperature and Fe/Mn=1/1,exhibited the highest catalytic,after 20min reaction,the degradation of Methyl Orange was 70.26%,which increased by 32.29%when compared with that in the sole ozonation.With addition of Tert-butano(TBA),the degradation of Methyl Orange was inhibited partly,which indicated that the reaction mechanism not only involved of the hydroxyl radical reaction mechanism,but also involved of other reaction mechanism.In order to further understand the intrinsic relationship between catalytic activity and internal structure of the catalyst,the Fe-MnO_(x) with best catalytic activity was characterized by XPS,TEM,XRD and BET,which indicates that the Fe-MnO_(x) consisted of Fe_(2)O_(3),FeO(OH),MnO_(2) and Mn_(5)O_(8).Besides,the catalyst was in uncertain crystal and evacuated structure,corresponding to an big specific surface area of 117.81 m^(2)/g.

关 键 词：Fe-MnO_(x) 共沉淀法 催化氧化 臭氧 甲基橙 

分 类 号：O64[理学—物理化学]