Fujian Key Laboratory of Polymer Materials, College of Materials Science and Engineering, Fujian Normal University , Fuzhou, Fujian 350007, China.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fuzhou, Fujian 350002, China.
ACS Appl Mater Interfaces. 2016 Jul 27;8(29):18904-11. doi: 10.1021/acsami.6b05918. Epub 2016 Jul 12.
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.
通过 1,3-双(4-溴苯基)咪唑溴盐和四(4-溴苯基)乙烯的 Yamamoto 反应，合成了一系列基于咪唑鎓的多孔有机聚合物（POP-Ims）。通过改变两种单体的比例，可以很好地调节此类聚合物的孔隙率和亲水性。具有最高咪唑鎓密度的 POP-Im（POP-Im1）在水中具有最好的分散性和去除 Cr2O7(2-)的最高效率。使用等量的 POP-Im1 在 5 分钟内即可达到 171.99 mg g(-1)的捕获容量和 87.9%的去除效率。然而，尽管具有较大的表面积和丰富的孔，但非离子类似物没有观察到 Cr2O7(2-)的捕获，这表明阴离子交换是去除 Cr2O7(2-)的驱动力。POP-Im1 在捕获 Cr2O7(2-)方面也表现出优异的富集能力和显著的选择性。过量的 POP-Im1 可完全去除酸性电镀废水中的 Cr(VI)。此外，由于掺入了发光的四苯乙烯部分，POP-Im1 可用作 Cr2O7(2-)的荧光探针。
