组装法制备巯基改性磁性SBA-15

doi:10.16085/j.issn.1000-6613.2017-1294

化工进展 ›› 2018, Vol. 37 ›› Issue (04): 1501-1508.DOI: 10.16085/j.issn.1000-6613.2017-1294

组装法制备巯基改性磁性SBA-15

张亚平^1,3, 甄彬^2,3, 黎汉生³, 冯亚青¹

1 天津大学化工学院, 天津 300072;
2 天津理工大学化学化工学院, 天津 300384;
3 北京理工大学化工与环境学院, 北京 100083

收稿日期:2017-06-26 修回日期:2017-12-07 出版日期:2018-04-05 发布日期:2018-04-05
通讯作者: 甄彬,讲师,研究方向为催化剂与催化反应工程研究。
作者简介:张亚平(1983-),女,博士,博士后。

Preparation of sulfydryl functionalized magnetic SBA-15 by an assembling process

ZHANG Yaping^1,3, ZHEN Bin^2,3, LI Hansheng³, FENG Yaqing¹

1 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 College of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China;
3 School of Chemical Engineering and the Environment, Beijing Institute of Technology, Beijing 100083, China

Received:2017-06-26 Revised:2017-12-07 Online:2018-04-05 Published:2018-04-05

摘要/Abstract

摘要： 采用热分解法制备了单分散、平均粒径约15nm的锰铁氧体磁性纳米粒子。通过正硅酸乙酯与磁性纳米粒子表面油酸盐的配体交换将磁性纳米粒子锚定在SBA-15表面。并且将负载过程与巯基改性过程耦合制备了巯基改性的磁性SBA-15。考察了合成SBA-15过程中干燥方式对其结构和性质的影响，研究了负载磁性纳米粒子和巯基改性顺序对巯基改性磁性SBA-15的结构和性能的影响。结果表明，喷雾干燥法合成的SBA-15介孔孔壁较薄，但具有更大的比表面积、孔体积和平均孔径。以其为载体时磁性纳米粒子负载量更大，所得磁性SBA-15的饱和磁强度更高。当将巯基改性和负载磁性纳米粒子分为前后两步时，巯基改性SBA-15的表面疏水环境有利于吸附疏水磁性纳米粒子，所得磁性SBA-15负载磁性纳米粒子量更大，饱和磁强度更高。磁性纳米粒子粒径大于SBA-15孔径，其主要负载于SBA-15外表面，有利于得到介孔孔道通畅的磁性SBA-15。巯基改性的磁性SBA-15的孔体积介于0.56~0.6cm³/g，比表面积介于353~432m²/g，饱和磁强度最高达到0.91emu/g，可作为一种大容量的吸附材料用于吸附分离、药物缓释等领域。

关键词: 分子筛, 二氧化硅, 复合材料, 磁性能, 表面改性

Abstract: Monodisperse and magnetic manganese ferrite nanoparticles with average diameter of 15nm were synthesized by a thermal decomposition method. The obtained magnetic nanoparticles were anchored onto the surface of SBA-15 through ligand exchange reaction of oleic acid and tetraethylorthosilicate. Meanwhile,sulfydryl functionalized magnetic SBA-15 was prepared by combining the anchoring process and surface modification of SBA-15. The influence of drying methods used during the synthesis of SBA-15 on its structure and properties was investigated. Effect of execution sequence of the anchoring and modification process on the structure and properties of sulfydryl functionalized magnetic SBA-15 was discussed. The result showed that SBA-15 prepared by spray drying showed thinner pore wall,higher specific surface area,pore volume and larger pore diameter,and could support more magnetic nanoparticles and thus exhibited stronger saturation magnetization. When the anchoring of the magnetic nanoparticles occurred on surface of the modified SBA-15,more nanoparticles were anchored on the surface of the SBA-15 due to a compatible hydrophobic chemical environment. Magnetic nanoparticles were mainly anchored onto the outside surface of SBA-15 because the pore diameters of the SBA-15 were smaller,which conserved the mesopores of SBA-15 unblocked. The obtained sulfydryl functionalized magnetic SBA-15 had pore volumes between 0.56cm³/g and 0.6cm³/g,specific surface area between 353m²/g and 432m²/g,and saturation magnetization of 0.91emu/g,which make it a high-capacity adsorbent for separation and drug release.

Key words: molecular sieve, silica, composites, magnetism, surface modification

中图分类号:

TB332

张亚平, 甄彬, 黎汉生, 冯亚青. 组装法制备巯基改性磁性SBA-15[J]. 化工进展, 2018, 37(04): 1501-1508.

ZHANG Yaping, ZHEN Bin, LI Hansheng, FENG Yaqing. Preparation of sulfydryl functionalized magnetic SBA-15 by an assembling process[J]. Chemical Industry and Engineering Progress, 2018, 37(04): 1501-1508.

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组装法制备巯基改性磁性SBA-15

Preparation of sulfydryl functionalized magnetic SBA-15 by an assembling process

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