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

研究了不同烷基链长度和Al含量的正烷基接枝MCM-41对烷基酚和烷基苯胺的分子选择性吸附。辛基比戊基和十二烷基具有更好的吸附剂性能。氮和水吸附等温线表明，辛基接枝样品在接枝烷基链之间具有大量强疏水性纳米空间。辛基接枝MCM-41以高分子选择性吸附水溶液中的烷基酚：正辛基接枝MCM-41可有效去除内分泌干扰物壬基酚，而叔戊基酚的吸附量很小，苯酚的吸附量检测不到。烷基酚和烷基苯胺的分子选择性的比较表明，分子上的亲水基团和疏水基团独立地影响选择性。吸附剂中捕获的正庚基苯胺的红外光谱表明，氨基与无机孔壁形成强烈的氢键结合：分子适合有机-无机纳米结构，与无机孔壁以及有机部分相互作用。由于分子的吸附量远大于 MCM-41 中掺杂的 Al 原子的量，因此在本例中，Al 掺杂产生的酸位对吸附的影响并不大。结论是，由离子无机表面围成的大量高疏水性纳米空间对于这些分子的有效吸附非常重要