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Materials 2017, 10(3), 266;

BPPO-Based Anion Exchange Membranes for Acid Recovery via Diffusion Dialysis

Department of Chemistry, The Islamia University of Bahawalpur, Bahawalpur 63000, Pakistan
School of Chemistry and Material Science, University of Science and Technology China, Hefei 230026, China
Department of Organic Chemistry University of Cordoba, Edificio Marie Curie, Ctra Nnal IV-A, Km396, Córdoba E14014, Spain
Department of Chemistry, G.S.C University of Bahawalpur, Bahawalpur 63100, Pakistan
Department of Environmental Sciences, Bahauddin Zakariya University, Multan 60000, Pakistan
Author to whom correspondence should be addressed.
Academic Editor: Reza Montazami
Received: 23 November 2016 / Revised: 1 March 2017 / Accepted: 2 March 2017 / Published: 7 March 2017
(This article belongs to the Section Porous Materials)
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To reduce the environmental impact of acids present in various industrial wastes, improved and robust anion exchange membranes (AEMs) are highly desired. Moreover, they should exhibit high retention of salts, fast acid permeation and they should be able to operate with low energy input. In this work, AEMs are prepared using a facile solution-casting from brominated poly-(2,6-dimethyl-1,4-phenylene oxide) (BPPO) and increasing amounts of 2-phenylimidazole (PI). Neither quaternary ammonium salts, nor ionic liquids and silica-containing compounds are involved in the synthesis. The prepared membranes showed an ion exchange capacity of 1.1–1.8 mmol/g, a water uptake of 22%–47%, a linear expansion ratio of 1%–6% and a tensile strength of 0.83–10.20 MPa. These membranes have potential for recovering waste acid via diffusion dialysis, as the acid dialysis coefficient (UH) at room temperature for HCl is in the range of 0.006–0.018 m/h while the separation factor (S) is in the range of 16–28, which are higher than commercial DF-120B membranes (UH = 0.004 m/h, S = 24). View Full-Text
Keywords: BPPO; 2-phenylimidazole; anion exchange membrane; diffusion dialysis; acid recovery BPPO; 2-phenylimidazole; anion exchange membrane; diffusion dialysis; acid recovery

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Khan, M.I.; Luque, R.; Prinsen, P.; Ur Rehman, A.; Anjum, S.; Nawaz, M.; Shaheen, A.; Zafar, S.; Mustaqeem, M. BPPO-Based Anion Exchange Membranes for Acid Recovery via Diffusion Dialysis. Materials 2017, 10, 266.

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