磺酰腙/GO复合膜的制备及分离性能研究

Preparation and separation performance of sulfonylhydrazone/GO composite membrane

本文用苯磺酰肼与4-溴代三苯胺和5-甲酰基噻吩-2-硼酸发生Suzuki偶联的产物通过缩合反应得到磺酰腙化合物BS-20(N′-((5-(4-(二苯基氨基)苯基)噻吩-2-基)亚甲基)苯磺酰腙),将BS-20溶于DMSO中与氧化石墨烯(GO)超声后,采用真空-抽滤法制得磺酰腙/GO(BS-20/GO)复合膜,并测试了其稳定性和对水体污染物的分离性能.结果表明,BS-20/GO复合膜对CR、MB溶液(100 mg L^(−1))的截留率分别高达99.98%和99.67%;对汞离子溶液(200 mg L^(−1))中汞的截留率达到了99.89%.通过与GO膜的对比实验和FT-IR、XPS测试结果表明BS-20/GO复合膜对汞离子、有机染料(CR、MB)的分离可能是化学作用(特征官能团的络合)、物理作用(尺寸筛分、静电作用)的协同效果,并研究其分离机制.本文为小分子GO复合膜在污染物分离中的应用有一定的理论和实际意义.

This paper reports on the synthesis of a sulfonamide compound,BS-20(N′-((5-(4-(diphenylamino)phenyl)thiophen-2-yl)methylene)benzenesulfonohydrazide),obtained from the Suzuki coupling reaction of rhizome with 4-bromo-triphenylamine and 5-formylthiophene-2-boronic acid,followed by condensation reaction.After dissolving BS-20 in DMSO and sonicating with graphene oxide(GO),a magnetic gel/GO(BS-20/GO)composite membrane was prepared by the vacuum-suction filtration.The stability and separation performance of this membrane for water pollutants were tested,and the results showed that the BS-20/GO composite membrane had a high rejection rate for CR and MB solutions(100 mg L^(−1)),reaching 99.98%and 99.67%,respectively.The rejection rate for mercury ion solution(200 mg L^(−1))reached 99.89%.Comparative experiments with GO membranes and FT-IR and XPS results suggest that the separation of atomic ions and organic dyes(CR,MB)by BS-20/GO composite membranes may be due to a synergistic effect of chemical interactions(characteristic functional groups)and physical effects(size sieving,electrostatic interactions),and the separation mechanism was studied.This paper has certain theoretical and practical significance for the application of small molecule GO composite membranes in the separation of pollutants.