软模法磁性有序介孔炭的合成与表征

Synthesis and characterization of magnetic ordered mesoporous carbon materials using soft templating method

以三嵌段共聚物为软模,间苯二酚-甲醛为炭前躯体,硝酸铁为铁源合成了磁性有序介孔炭,用XRD、氮气吸附、磁性测试等方法对样品进行表征。结果表明,当硝酸铁与间苯二酚摩尔比为0.025、0.05及0.10时得到的介孔炭具有有序性,随着铁质量分数的增加,有序性降低,比表面积、孔容都相应减小。基本磁化曲线结果表明,随着铁质量分数的增加,饱和磁化强度随之增加(0.01～0.10 emu/g),材料具有较好的磁性,容易从溶液中分离,表现出良好的分离性能。为磁性有序介孔炭的优化合成及磁性分离应用提供科学依据。

Magnetic ordered mesoporous carbon is synthesized through soft templating method by using triblock- copolymer Pluronie F127 as soft template, resoreinol-formaldehyde （RF） as carbon precursor and ferric nitrate as an iron source. HCl is used as the catalyst for RF polymerization. The resultant materials are characterized by X-ray diffraction, N2 sorption and vibrating-sample magnetometer measurements. The results show that magnetic ordered mesoporous carbons are obtained when the Fe/R ratio is 0. 025. For those with Fe/R ratios greater than this value, the ordering, the BET surface area, pore volume and pore size decrease. N2 sorption isotherms of all the samples show representative type IV curves with H1 hysteresis loops, which indicates a typical mesoporous material. Magnetic hysteresis loops show that the remanent magnetization of Fe/OMC samples increases with the increase of the content of Fe. This research can provide scientific proof for the optimized synthesis and application in magnetic separation for magnetic ordered mesoporous carbons.