Fe-Al_(2)O_(3)/SBA-15催化臭氧氧化水中布洛芬

Catalytic ozonation of ibuprofen by Fe-Al_(2)O_(3)/SBA-15 in water

以嵌段共聚物为模板剂,在酸性条件下水热合成SBA-15.将铁、铝负载于SBA-15表面制备Fe-Al_(2)O_(3)/SBA-15介孔分子筛催化剂,并将其用于催化臭氧氧化水中布洛芬(IBU).透射电子显微镜、X射线衍射、氮气吸附-脱附表征结果表明,铁、铝均匀负载于SBA-15表面,保持SBA-15有序的介孔结构,具有较大的比表面积.不同催化剂活性评价结果表明,铁、铝的负载显著提高SBA-15催化臭氧氧化水中布洛芬的活性,反应60 min后,Fe-Al_(2)O_(3)/SBA-15的TOC去除率为90%,而Al_(2)O_(3)/SBA-15、Fe/SBA-15和SBA-15的TOC去除率分别为65%、50%和36%,单独臭氧氧化仅为26%.实验结果表明,铁、铝的协同作用有利于臭氧分解为羟基自由基、超氧自由基和活性原子氧,布洛芬和小分子有机酸吸附于催化剂表面从而有利于有机物的矿化.催化剂重复利用6次后仍保持较高的催化活性和稳定性.

SBA-15 was synthesized hydrothermally in acidic conditions using block copolymer as template.Fe-Al_(2)O_(3)/SBA-15 mesoporous molecular sieve catalyst was prepared by loading iron and aluminum on the surface of SBA-15,and it was used for catalytic ozonation of ibuprofen in water.The characterization results of transmission electron microscope,X-ray diffraction and nitrogen adsorption desorption showed that iron and aluminum were uniformly loaded on the surface of SBA-15,maintaining the ordered mesoporous structure of SBA-15,and having a large specific surface area.The activity evaluation results of different catalysts showed that the loading of iron and aluminum significantly improved the catalytic activity of SBA-15 for ozonation of ibuprofen in water,and iron and aluminum had a synergistic effect.After 60 min of reaction,the TOC removal rate of Fe-Al_(2)O_(3)/SBA-15 was 90%,while that of Al_(2)O_(3)/SBA-15,Fe/SBA-15 and SBA-15 were 65%,50%and 36%,respectively,and that of ozonation alone was only 26%.The experimental results showed that the synergistic effect of iron and aluminum was beneficial to the decomposition of ozone into hydroxyl radicals,superoxide radicals and active atomic oxygen.Ibuprofen and small molecule organic acid were adsorbed on the surface of the catalyst,which was conducive to the mineralization of organic matter.The catalyst remains high catalytic activity and stability after being reused for 6 times.