Synthesis of temperature-responsive anion exchanger via click reaction.
Synthesis of temperature-responsive anion exchanger via click reaction.
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DOI：
10.1016/j.jcis.2012.02.040
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发表时间：
2012-06
影响因子：
9.9
通讯作者：
K. Murakami;Xue Yu;Takahiro Kato;Y. Inoue;K. Sugawara
中科院分区：
文献类型：
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作者：
K. Murakami;Xue Yu;Takahiro Kato;Y. Inoue;K. Sugawara
通过点击反应将温度响应性高分子聚N-异丙基丙烯酰胺（PNIPAM）固定在介孔氧化硅的外表面，合成了温度响应性阴离子交换剂。采用X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、扫描电镜（SEM）、元素分析和氮气吸附实验对复合材料的结构进行了表征。通过热重法测得的失重计算，固定在介孔二氧化硅外表面上的PNIPAM的量从5.3wt.%至12.9wt.% (dry)这取决于在点击反应中加入的PNIPAM的量。该阴离子交换剂对甲基橙子（MO）离子的吸附-脱附行为受溶液温度的影响：在25°C时，MO离子随溶液pH的变化而可逆地反复吸附和脱附;在40°C时，MO离子的吸附量几乎保持恒定，约为0.05mmol/g，与溶液pH无关。此外，固定在介孔二氧化硅上的PNIPAM的量影响MO离子的吸附速率，这表明在该复合材料中的吸附速率由MO离子通过PNIPAM层的扩散控制。
The temperature-responsive anion exchanger was synthesized by immobilizing the poly(N-isopropylacrylamide) (PNIPAM), a kind of the temperature-responsive polymer, on the external surface of mesoporous silica via click reaction. The structure of this synthesized composite was characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), elemental analysis, and nitrogen adsorption experiment. The amount of PNIPAM immobilized on the external surface of mesoporous silica, which was calculated from the weight loss measured by thermogravimetry, increased from 5.3wt.% to 12.9wt.% (dry) depending on the amount of PNIPAM added in the click reaction. The adsorption–desorption behavior of methyl orange (MO) ions in this synthesized anion exchanger was affected by the temperature of aqueous solution: the MO ions were adsorbed and desorbed reversibly and repeatedly with changing the pH of the solution at 25°C, while the amount of adsorbed MO ions remained nearly constant at about 0.05mmol/g independent of the pH of the solution at 40°C. Also, the amount of PNIPAM immobilized on the mesoporous silica influenced the adsorption rate of MO ions, suggesting that the adsorption rate in this composite is controlled by the diffusion of MO ions through the PNIPAM layer.