不同负载方式Fe/改性MCM-41催化剂的制备及其降解亚甲基蓝性能研究

以自制二元共聚物聚[苯乙烯—3-（甲基丙烯酰氧）丙基三甲氧基硅烷]改性MCM-41,并以其为载体分别采用浸渍负载活性金属、原位负载活性金属和NaBH₄还原负载活性金属的方式制备铁基异相催化剂。研究了3类催化剂降解亚甲基蓝的性能差异。结果显示,在3种催化剂中,浸渍负载活性金属制备的催化剂具有最好的催化活性,25 min时亚甲基蓝去除率为81.2%。同时采用XRD、TEM、FTIR、XPS、压汞测试等手段分析了催化剂具有优异性能的原因。表征结果表明:Fe与改性MCM-41间的相互作用及催化剂孔结构,两者的协同作用是催化剂具有优异性能的原因。

Study on preparation of Fe/modified MCM-41 catalyst with different loading methods and degradation of methylene blue

The modified MCM-41 with Poly（styrene-3-methacryloxy propyltrimethoxy silane） supported iron-based hetero-geneous catalysts were synthesized and worked as support.The iron-based heterogeneous catalysts were prepared by impregna-tion,in situ loading and NaBH₄ reduction for loading active metals.The activity of the three kinds of catalysts for degradation of methylene blue was systematically investigated.The results showed that among the catalysts, the catalyst prepared by impregnation showed the best activity with 81.2% removal rate of methylene blue at 25 min.At the same time,XRD,TEM,FTIR, XPS and mercury porosimetry were employed to investigate the reason of excellent catalytic performance.The characterization result indicated that synergistic effect of the interaction between Fe and modified MCM-41 and the pore structure of catalyst were responsible for catalytic performance.