石墨烯改性Al-MCM-41介孔分子筛负载铁芬顿催化剂降解苯酚  

Fenton catalytic degradation of phenol by using iron-loaded graphene modified mesoporous Al-MCM-41 catalyst

作　　者：邓曹林 王京刚[1] 王颖[2] 方嘉声[1] 

机构地区：[1]北京化工大学化学工程学院,北京100029 [2]北京师范大学环境学院水环境模拟国家重点实验室,北京100875

出　　处：《环境化学》2015年第6期1185-1192,共8页Environmental Chemistry

基　　金：国家国际科技合作专项项目(2013DFR90290);国家自然科学基金(21177013)资助

摘　　要：采用高温回流法将石墨烯(gh)掺杂于Al-MCM-41介孔分子筛中,通过浸渍法制备了石墨烯改性Al-MCM-41介孔分子筛负载铁芬顿催化剂(gh-Al-MCM-41-Fe),利用比表面仪、扫描电子显微镜-X射线能谱(SEM-EDX)对催化剂进行了表征,考察了不同p H条件下该催化剂对苯酚的催化降解效能.结果表明,gh-Al-MCM-41-Fe催化剂具有介孔结构,表明颗粒分布均匀,石墨烯的掺杂减小了颗粒粒径,与多种催化剂(非介孔Al2O3-Cu Al2O4、介孔Al2O3-Cu、介孔Al2O3-Fe、介孔Al-MCM-41-Fe)相比,gh-Al-MCM-41-Fe具有最高的苯酚催化降解效能,反应符合一级反应特征,石墨烯的掺杂能明显提高苯酚降解率和COD去除率,减少铁的溶出,拓宽p H范围,当p H值为3—5,反应90 min,COD去除率达到60%以上.Graphene（ gh） modified mesoporous molecular sieves Al-MCM-41 were synthesized via a high temperature reflow method. Then gh-Al-MCM-41-Fe catalyst was prepared by a impregnation method. The catalyst was characterized by surface analyzer,scanning electron microscopy-energy dispersive X-ray spectrometry（ SEM-EDX）. Fenton catalytic degradation efficiency of phenol under different p H conditions was evaluated. The results showed that gh-Al-MCM-41-Fe possessed mesoporous structure and the particles distributed homogenously. The doped graphene reduced particle size. Compared with various catalysts（ non- mesoporous Al2O3-Cu Al2O4,mesoporous Al2O3-Cu,mesoporous Al2O3-Fe,mesoporous Al-MCM-41-Fe）,gh-Al-MCM-41-Fe had the highest catalytic degradation capacity for phenol. The reaction process complied with the first-order kinetics model. The doping of graphene increased the degradation rate of phenol and the removal rate of COD,reduced the iron dissolution and expanded the p H range of the degradation reaction. When p H value was 3—5,the removal rate of COD reached more than 60% after 90 min reaction.

关 键 词：非均相芬顿 石墨烯 催化降解 AL-MCM-41 苯酚. 

分 类 号：X703[环境科学与工程—环境工程]