title: Novel Pendant Benzene Disulfonic Acid Blended SPPO Membranes for Alkali Recovery: Fabrication and Properties.
abstract: To reconcile the trade-off between separation performance and availability of desired material for cation exchange membranes (CEMs), we designed and successfully prepared a novel sulfonated aromatic backbone-based cation exchange precursor named sodium 4,4'-(((((3,3'-disulfo-[1,1'-biphenyl]-4,4'-diyl)bis(oxy)) bis(4,1-phenylene))bis(azanediyl))bis(methylene))bis(benzene-1,3-disulfonate) [DSBPB] from 4,4'-bis(4-aminophenoxy)-[1,1'-biphenyl]-3,3'-disulfonic acid [BAPBDS] by a three-step procedure that included sulfonation, Michael condensation followed by reduction. Prepared DSBPB was used to blend with sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (SPPO) to get CEMs for alkali recovery via diffusion dialysis. Physiochemical properties and electrochemical performance of prepared membranes can be tuned by varying the dosage of DSBPB. All the thermo-mechanical properties like DMA and TGA were investigated along with water uptake (WR), ion exchange capacity (IEC), dimensional stability, etc. The effect of DSBPB was discussed in brief in connection with alkali recovery and ion conducting channels. The SPPO/DSBPB membranes possess both high water uptake as well as ion exchange capacity with high thermo-mechanical stability. At 25 °C the dialysis coefficients (UOH) appeared to be in the range of 0.0048-0.00814 m/h, whereas the separation factor (S) ranged from 12.61 to 36.88 when the membranes were tested for base recovery in Na2WO4/NaOH waste solution. Prepared membranes showed much improved DD performances compared to traditional SPPO membrane and possess the potentiality to be a promising candidate for alkali recovery via diffusion dialysis.
authors.affiliation: †CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, P. R. China.
authors.forename: Abhishek N
authors.initials: AN
authors.lastname: Mondal
authors.affiliation: †CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, P. R. China.
authors.forename: Chunhua
authors.initials: C
authors.lastname: Dai
authors.affiliation: †CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, P. R. China.
authors.forename: Jiefeng
authors.initials: J
authors.lastname: Pan
authors.affiliation: ‡Hefei Chemjoy Polymer Materials Co. Ltd., Hefei 230601, P. R. China.
authors.forename: Chunlei
authors.initials: C
authors.lastname: Zheng
authors.affiliation: †CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, P. R. China.
authors.forename: Md Masem
authors.initials: MM
authors.lastname: Hossain
authors.affiliation: †CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, P. R. China.
authors.forename: Muhammad Imran
authors.initials: MI
authors.lastname: Khan
authors.affiliation: †CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, P. R. China.
authors.forename: Liang
authors.initials: L
authors.lastname: Wu
authors.affiliation: †CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, P. R. China.
authors.forename: Tongwen
authors.initials: T
authors.lastname: Xu
mesh_terms: D000468:Alkalies / Q000737:chemistry* / Q000302:isolation & purification*; D001557:Benzenesulfonates / Q000737:chemistry*; D002852:Chromatography, Ion Exchange / Q000379:methods*; D004058:Diffusion; D007474:Ion Exchange; D007475:Ion Exchange Resins / Q000138:chemical synthesis*; D008422:Materials Testing; D008567:Membranes, Artificial; D010647:Phenyl Ethers / Q000737:chemistry; D011108:Polymers / Q000737:chemistry
chemical_list: D000468:Alkalies; D001557:Benzenesulfonates; D007475:Ion Exchange Resins; D008567:Membranes, Artificial; D010647:Phenyl Ethers; D011108:Polymers; C488462:poly(2,6-dimethyl-1,4-phenylene oxide)
keywords: DSBPB; SPPO; alkali recovery; cation exchange membrane; diffusion dialysis