Imidazolium-Based Porous Organic Polymers: Anion Exchange-Driven Capture and Luminescent Probe of Cr2O72–

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• 作者：Yanqing Su ; Yangxin Wang ; Xiaoju Li ; Xinxiong Li ; Ruihu Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 27, 2016
• 年：2016
• 卷：8
• 期：29
• 页码：18904-18911
• 全文大小：536K
• 年卷期：0
• ISSN：1944-8252

文摘

A series of imidazolium-based porous organic polymers (POP-Ims) was synthesized through Yamamoto reaction of 1,3-bis(4-bromophenyl)imidazolium bromide and tetrakis(4-bromophenyl)ethylene. Porosities and hydrophilicity of such polymers may be well tuned by varying the ratios of two monomers. POP-Im with the highest density of imidazolium moiety (POP-Im1) exhibits the best dispersity in water and the highest efficiency in removing Cr₂O₇^2–. The capture capacity of 171.99 mg g^–1 and the removal efficiency of 87.9% were achieved using an equivalent amount of POP-Im1 within 5 min. However, no Cr₂O₇^2– capture was observed using nonionic analogue despite its large surface area and abundant pores, suggesting that anion exchange is the driving force for the removal of Cr₂O₇^2–. POP-Im1 also displays excellent enrichment ability and remarkable selectivity in capturing Cr₂O₇^2–. Cr(VI) in acid electroplating wastewater can be removed completely using excess POP-Im1. In addition, POP-Im1 can serve as a luminescent probe for Cr₂O₇^2– due to the incorporation of luminescent tetraphenylethene moiety.