火山岩负载含锰氧化物催化臭氧化降解水中亚甲基蓝  

Degradation of methylene blue wastewater by catalytic ozonation on MnO_x/volcanic rocks

作　　者：闫妍[1] 侯永江[1] 刘璇[1] 国洁[1] 王亚权[2] 韩佳颐 

机构地区：[1]河北科技大学环境科学与工程学院,河北石家庄050018 [2]天津大学化工学院,天津300072

出　　处：《工业催化》2016年第9期23-28,共6页Industrial Catalysis

基　　金：国家自然科学基金(21276183)资助项目;河北省重点科技计划项目(16274008D)

摘　　要：以火山岩为载体,采用等体积浸渍法制备MnO_x/火山岩催化剂,并对其进行XRD、SEM、XRF和BET表征,通过模拟亚甲基蓝废水实验对催化剂活性进行评价。XRD结果表明,110℃焙烧的催化剂开始生成MnO_2,200℃焙烧的催化剂中有明显的MnO_2衍射峰;300℃焙烧的催化剂中生成MnO_2,400℃焙烧的催化剂中生成Mn3O4。SEM结果表明,负载的MnO_2均匀分布在火山岩表面。在焙烧温度200℃和臭氧通量1.0 mg·min-1条件下,MnO_x/火山岩催化剂上的亚甲基蓝脱色率最大,反应时间12 min,脱色率达100%,亚甲基蓝的矿化度从36.14%提高至76.04%。催化臭氧化系统主要遵循羟基自由基的反应机理。Using volcanic rock as the support, MnOx/volcanic rock catalysts were prepared by the incipent wetness impregnation method. The as-prepared catalysts were characterized by XRD, SEM, XRF and BET. The activity of the catalyst was evaluated by catalytic ozonation of methylene blue （MB） wastewater. The XRD results showed that the peaks of MnO2 first appeared after calcination at 110 ℃ and then became apparent at 200 ℃ , while MnO2 was formed at 300 % and finally Mn3 04 existed after calcination at 400 ℃. The SEM results showed that the supported MnO2 was uniformly dispersed on the surface of volcanic rock. Under the condition of catalyst calcination temperature 200 ℃, ozone flux 1.0 mg. min^-1 and reaction time 12 min, the maximum MB decoloration efficiency on MnOx/volcanic rock catalyst reached 100%. Further more, MB mineralization degree increased from 36.14% to 76.04%. The reaction followed the mechanism of hydroxyl radical.

关 键 词：催化化学 MnOx/火山岩 催化臭氧化 亚甲基蓝 

分 类 号：O643.36[理学—物理化学] X703[理学—化学]