Design of Molecular Recognition and Adsorbents for Harmful Molecules in Water using Nanospace-Organic-Inorganic Triple Nano-structure

利用纳米空间-有机-无机三重纳米结构设计水中有害分子的分子识别和吸附剂

基本信息

批准号：
13650844
负责人：
INUMARU Kei
金额：
$ 2.3万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

Molecular selective adsorption of alkylphenols and alkylanilines are studied for n-alkyl grafted MCM-41 with different alkyl-chain lengths and Al contents. Octyl groups gave better performance of the adsorbents than pentyl and dodecyl groups. Nitrogen and water adsorption isotherms revealed that the octyl-grafted sample has a large volume of strongly hydrophobic nanospaces between the grafted alkyl chains. Octyl-grafted MCM-41 adsorbed alkylphenols from aqueous solutions with high molecular selectivity : Nonylphenol, an endocrine disrupter, is efficiently removed by adsorption into n-octyl grafted MCM-41, while adsorption of t-amylphenol is small and that of phenol is undetectable. Comparison of molecular selectivities for alkylphenols and alkylanilines reveals that hydrophilic and hydrophobic groups on molecules independently affect the selectivity. Infrared spectra of n-heptylaniline captured in the adsorbent show that the amino groups are strongly hydrogen-bonded onto the inorganic pore walls : The molecules fit the organic-inorganic nanostructure, interacting with the inorganic walls as well as the organic moiety. Since the molecules were adsorbed with much larger amounts than that of Al atoms doped in MCM-41, the effect of the acid sites produced by Al doping on the adsorption was not large in the present case. It was concluded that large volume of highly hydrophobic nanospaces that were walled by the ionic inorganic surfaces was important for efficient adsorption of these molecules

研究了具有不同烷基链长度和Al含量的N-烷基接枝MCM-41的分子选择性吸附，烷基苯酚和烷基苯胺的MCM-41。辛基人比戊基和十二烷基的吸附剂具有更好的性能。氮和水吸附等温线表明，辛基种植样品在移植的烷基链之间具有大量的强疏水纳米空间。辛基移植的MCM-41从具有高分子选择性的水溶液中吸附的烷基苯酚：内分泌溶剂的北甲醇通过吸附到N-辛基移植的MCM-41中可以有效地去除，而t-氨基苯酚的吸附是小小的，而小氨基酚是phenoloble of Pernol的phentectectectectect。比较烷基苯酚和烷基苯胺的分子选择性的比较表明，分子上的亲水性和疏水性基团独立影响选择性。在吸附剂中捕获的N-肝苯胺的红外光谱表明，氨基群强烈键入无机孔隙壁：分子适合有机无机纳米结构，与无机壁以及有机小节相互作用。由于分子的吸附量远大于MCM-41中掺杂的Al原子的吸附量，因此在本情况下，Al掺杂对吸附的酸位点的影响并不大。得出的结论是，由离子无机表面围墙的大量高度疏水纳米空间对于有效吸附这些分子很重要