School of Chemistry, University of Manchester, Manchester M13 9PL, UK; Department of Chemistry, Ahi Evran University, Kirsehir 40100, Turkey.
School of Chemistry, University of Manchester, Manchester M13 9PL, UK.
J Colloid Interface Sci. 2017 Apr 15;492:81-91. doi: 10.1016/j.jcis.2016.12.048. Epub 2016 Dec 28.
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 48h 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.
聚合物聚酰亚胺-1 中的腈基基团通过碱催化水解、与乙醇胺和二乙醇胺反应以及还原为胺进行了修饰，并研究了这些产物从水溶液或乙醇溶液中吸收一系列染料的能力。水解产物对阳离子物种表现出选择性，而其他产物则表现出相反的选择性。在低 pH 值下，胺-聚酰亚胺-1 从水溶液中吸附了超过其自身重量的阴离子染料橙色 II 和酸性红 I。证明碱性乙醇可以去除吸附的橙色 II。带相反电荷的染料混合物会发生沉淀，但一种染料的选择性吸附会导致沉淀中另一种染料的溶解。在惰性气氛中于 300°C 下对化学改性聚合物进行热处理 48 小时会导致结构发生变化，从而降低染料吸附能力。基于热重分析和元素分析以及衰减全反射-红外和 NMR 光谱的结合，提出了可行的结构来解释热处理后的聚合物。
