改性SBA-15负载羟基氧化铁制备及在臭氧催化中的应用

Preparation of FeOOH /Modified SBA-15 and Its Application in Ozone Catalyst

目的为提高处理难降解有机物的作用效果,在臭氧催化反应中加入催化剂,从而促进臭氧产生大量的羟基自由基,增强臭氧的氧化性.方法以对臭氧起着良好催化作用的羟基氧化铁作为基础,利用介孔材料SBA-15的孔道结构,把两者结合起来制备改性SBA-15负载羟基氧化铁.结果改性SBA-15负载羟基氧化铁降解硝基苯效率从原来的38.47%提高至72.35%.与羟基氧化铁对比:改性SBA-15负载羟基氧化铁的降解效果比羟基氧化铁高4.2%,比表面积比羟基氧化铁大37.48m2/g,铁溶出量是羟基氧化铁的1/20.结论笔者制备的改性SBA-15负载羟基氧化铁具有机械强度高、比表面积大、铁溶出量少的特点,能够在臭氧催化中提高硝基苯的降解效率.

In order to improve the effect of degradation of organic matter, this paper proposed that FeOOH/modified SBA-15 catalyst should be added in catalytic reaction of ozone, so as to increase the performance of ozone oxidation. FeOOH/modified SBA-15 was Obtained by combinations of FeOOH which have a good effect on ozone catalytic and channel structures of SBA-15. It is shown that for optimal catalyst,the productivity of modified SBA-15 increases from 38.47% to 72.35% in terms of degradation of nitrobenzene. Compared with FeOOH, the results show that the treatment effects are 4.2% higher than FeOOH; the size of BET of FeOOH/modified SBA-15 is 37.48 m^2/g which is bigger than FeOOH; the FeOOH iron solution are 20 times of FeOOH/modifled SBA-15. It indicates that FeOOH/modified SBA-15 has a good efficiency in degradation of nitrobenzene, and also has high mechanical strength, large BET and a little dissolubility of iron.