Molecular selective adsorption of alkylphenols and alkylanilines from water by alkyl-grafted mesoporous alumina: A comparative study to alkyl-grafted mesoporous silica
Molecular selective adsorption of alkylphenols and alkylanilines from water by alkyl-grafted mesoporous alumina: A comparative study to alkyl-grafted mesoporous silica
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DOI：
10.1016/j.micromeso.2006.05.026
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发表时间：
2006-10
影响因子：
5.2
通讯作者：
K. Inumaru;T. Nakano;S. Yamanaka
中科院分区：
文献类型：
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作者：
K. Inumaru;T. Nakano;S. Yamanaka
研究了正构烷基接枝介孔氧化铝对烷基酚和烷基苯胺的分子选择性吸附，并与正构烷基接枝介孔二氧化硅进行了比较。水吸附等温线表明，介孔氧化铝的亲水性纳米空间经十二烷基接枝后变得高度疏水。十二烷基接枝介孔氧化铝(C12-Mpa)优先吸附烷基苯胺和烷基苯酚，如4-庚基苯胺(HA)和4-庚基苯酚(HP)。比较了HA在C12-MPS和辛基接枝介孔二氧化硅(C8-MPS)上的吸附等温线，发现HA分子在C12-MPS上的表面密度远低于在C8-MPS上的表面密度。烷基接枝氧化铝和烷基接枝二氧化硅的不同吸附性能可以用吸附分子通过与有机疏水纳米空间和无机孔壁相互作用进入纳米结构的机理来解释，即纳米结构内的有机-无机协同分子识别。
Molecular selective adsorption of alkylphenols and alkylanilines onto n-alkyl-grafted mesoporous alumina was investigated and compared to that onto n-alkyl-grafted mesoporous silica. Water adsorption isotherms revealed that the hydrophilic nanospaces of the mesoporous alumina became highly hydrophobic after dodecyl-grafting. Alkylanilines and alkylphenols with a large alkyl group, such as 4-heptylaniline (HA) and 4-heptylphenol (HP), were preferentially adsorbed by dodecyl-grafted mesoporous alumina (C12-MPA). A comparison of the adsorption isotherms of HA on C12-MPA with those on octyl-grafted mesoporous silica (C8-MPS) revealed that the surface density of the HA molecule adsorbed on C12-MPA was much lower than that adsorbed on C8-MPS. The different adsorption properties of the alkyl-grafted alumina and alkyl-grafted silica can be explained by a mechanism in which adsorbed molecules fit into the nanostructure by interacting with both the organic hydrophobic nanospaces and the inorganic pore walls, i.e. organic–inorganic cooperative molecular recognition within the nanostructure.