Surface modification of alumina nanofibres for the selective adsorption of alachlor and imazaquin herbicides.
Surface modification of alumina nanofibres for the selective adsorption of alachlor and imazaquin herbicides.
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DOI：
10.1016/j.jcis.2011.04.055
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发表时间：
2011-08
影响因子：
9.9
通讯作者：
B. Paul;W. Martens;R. Frost
中科院分区：
文献类型：
--
作者：
B. Paul;W. Martens;R. Frost
使用具有可控吸收特性的热稳定和化学稳定的基质有效去除污染物是水处理的目标。本研究采用3-氯丙基三乙氧基硅烷（CPTES）和辛基三乙氧基硅烷（OTES）两种有机硅烷试剂对纳米氧化铝（γ-Al2O3）纤维进行表面接枝改性。将改性后的材料作为吸附剂，对水中甲草胺和灭草喹进行了吸附试验。在官能化过程中形成的有机基团在纳米纤维的表面上建立了超疏水位点。这种超疏水基团是一种突出的吸附位点，便于与污染物密切接触。OTES接枝基质显示出对甲草胺更高的选择性，而CPTES接枝基质显示出对咪唑喹的选择性。动力学研究表明，咪唑喹快速吸附在CPTES改性表面。但OTES接枝表面对甲草胺的吸附速度较慢。
The effective removal of pollutants using a thermally and chemically stable substrate that has controllable absorption properties is a goal of water treatment. In this study, the surfaces of thin alumina (γ-Al2O3) nanofibres were modified by the grafting either of two organosilane agents, 3-chloro-propyl-triethoxysilane (CPTES) and octyl-triethoxysilane (OTES). These modified materials were then trialed as absorbents for the removal of two herbicides, alachlor and imazaquin from water. The formation of organic groups during the functionalisation process established super hydrophobic sites on the surfaces of the nanofibres. This super hydrophobic group is a kind of protruding adsorption site which facilitates the intimate contact with the pollutants. OTES grafted substrate were shown to be more selective for alachlor while imazaquin selectivity is shown by the CPTES grafted substrate. Kinetics studies revealed that imazaquin was rapidly adsorbed on CPTES-modified surfaces. However, the adsorption of alachlor by OTES grafted surface was achieved more slowly.