δ-MnO_(2)和Mn_(3)O_(4)催化臭氧化亚甲基蓝特性及差异  

Characteristics and differences of the catalytic ozonation of methylene blue byδ-MnO_(2) and Mn_(3)O_(4)

作　　者：张瑞峰 张犇 周鹏龙 郭英明 陈希 ZHANG Ruifeng;ZHANG Ben;ZHOU Penglong;GUO Yingming;CHEN Xi(School of Urban Planning and Municipal Engineering, Xi’an Polytechnic University, Xi’an 710048, China)

机构地区：[1]西安工程大学城市规划与市政工程学院,陕西西安710048

出　　处：《西安工程大学学报》2022年第3期54-62,共9页Journal of Xi’an Polytechnic University

基　　金：陕西省自然科学基础研究计划项目(2021JQ-688,2021JQ-690);陕西省教育厅专项科研计划项目(20JK0656);陕西省大学生创新创业训练计划项目(S202010709061)。

摘　　要：针对锰氧化物催化臭氧化染料废水的特性及差异,对比考察δ-MnO_(2)和Mn_(3)O_(4)2种锰氧化物对亚甲基蓝废水的催化效果及影响因素,分析催化剂的吸附特性及叔丁醇对催化效果的影响,并采用XRD、SEM、BET和FTIR等方法对锰氧化物进行结构表征,进一步揭示2种锰氧化物催化性能的差异机制。结果表明:δ-MnO_(2)和Mn_(3)O_(4)均能显著提高催化臭氧化反应体系效率,且δ-MnO_(2)催化活性更强,色度和COD_(cr)去除率分别达到99.77%和71.43%。当溶液pH=11,催化剂投加量为2.4 g/L,臭氧质量浓度为9.5 mg/L时,体系催化效果最佳。2种锰氧化物均可促使臭氧产生·OH,但δ-MnO_(2)比表面积更大,表面羟基更丰富及吸附性能更好,因而δ-MnO_(2)比Mn_(3)O_(4)具有更好的催化效果。According to the characteristics and differences of manganese oxides in the catalytic treatment of dye wastewater,the catalytic capability and its influencing factors ofδ-MnO_(2) and Mn_(3)O_(4) two manganese oxides on the catalyzation of methylene blue wastewater were comparatively investigated,the adsorption characteristics of the catalysts and the effect of tert-butyl alcohol on the catalytic efficiency were explored,and the XRD,SEM,BET and FTIR methods were used to study the structural characteristics of the oxides to further reveal the mechanism of the difference in the catalytic performance of the two manganese oxides.The results show that bothδ-MnO_(2) and Mn_(3)O_(4) can improve the efficiency of the catalytic ozonation system significantly,andδ-MnO_(2) has higher catalytic activity,the removal rates of chroma and COD_(cr) are 99.77%and 71.43%,respectively,and when pH=11,the dosage of catalyst is 2.4 g/L,and the mass concentration of ozone is 9.5 mg/L,the removal performance ofδ-MnO_(2) is the best.Both of the oxides can promote the production of·OH,butδ-MnO_(2) has larger specific surface area,more amount of surface hydroxyl groups and better adsorption performance,which has better catalytic effect than Mn_(3)O_(4).

关 键 词：亚甲基蓝 锰氧化物 催化臭氧化 脱色 COD_(cr) 

分 类 号：TS190.3[轻工技术与工程—纺织化学与染整工程] TQ085.4[轻工技术与工程—纺织科学与工程]