Selective dye adsorption by chemically-modified and thermally-treated polymers of intrinsic microporosity.
Selective dye adsorption by chemically-modified and thermally-treated polymers of intrinsic microporosity.
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DOI：
10.1016/j.jcis.2016.12.048
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发表时间：
2017-04
影响因子：
9.9
通讯作者：
Bekir Satilmis;P. Budd
中科院分区：
文献类型：
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作者：
Bekir Satilmis;P. Budd
通过碱催化水解、与乙醇胺和二乙醇胺反应以及还原成胺，对具有固有微孔的PIM-1聚合物中的丁腈基团进行了修饰，并考察了它们从水溶液或乙醇溶液中吸收一系列染料的能力。水解物对阳离子物种的选择性高于阴离子物种，而其他产物对阴离子物种的选择性相反。在低pH条件下，胺-PIM-1从水溶液中对橙色II和酸性红I等阴离子染料的吸附大于其自身重量。结果表明，用碱性乙醇可以去除吸附的橙黄II。带相反电荷的染料的混合物经历沉淀，但选择性地吸附一种染料会导致另一种染料从沉淀中溶解。经过化学修饰的聚合物在300℃下在惰性气氛中热处理48小时会导致结构变化，从而降低染料的吸附能力。结合热重分析、元素分析、ATR-IR和核磁共振光谱，对热处理后的聚合物提出了可行的结构。
Nitrile groups in the polymer of intrinsic microporosity PIM-1 were modified by base-catalysed hydrolysis, by reaction with ethanolamine and diethanolamine, and by reduction to amine, and the products investigated for their ability to take up a range of dyes from aqueous or ethanolic solution. Hydrolysed products exhibited selectivity for cationic over anionic species, while other products showed the reverse selectivity. At low pH, amine-PIM-1 adsorbed more than its own weight of the anionic dyes Orange II and Acid Red I from aqueous solution. It was demonstrated that adsorbed Orange II can be removed with basic ethanol. Mixtures of oppositely charged dyes undergo precipitation, but selective adsorption of one dye leads to dissolution of the other from the precipitate. Thermal treatment of the chemically modified polymers at 300 °C for 48 h in an inert atmosphere led to structural changes that reduced the dye adsorption capacity. On the basis of a combination of thermogravimetric and elemental analysis with ATR-IR and NMR spectroscopy, feasible structures are suggested for the thermally-treated polymers.