Study On Preparation Of Novel Anion Exchange Membrane And Its Performance In Reverse Electrodialysis

Salinity gradient power can be an effective way to solve the consumption of non-renewable resources and the increasingly serious environmental pollution problems.Reverse electrodialysis(RED)is a non-polluting,sustainable technology that can achieve highest energy efficiency from Salinity gradient.Ion exchange membrane is the most important part of the RED.The main factors restricting the development of the RED is high performance membranes which possess low resistance and high permeability have a higher price.In order to solve these problems,this paper introduces a tailor-made anion exchange membrane and characterizes its RED performance,then compared the power output with commercial film.In this paper,a series of anion exchange membranes were prepared by using brominated poly(2,6-dimethyl-1,4-phenylene oxide)(BPPO)as polymer matrix,N,N-Dimethylaminoethyl methacrylate(DMAEMA)as the quaternary amination reagent and crosslinking agent.The effects of different amination time,thermal polymerization temperature,the ratio of BPPO and DMAEMA on the properties of the membranes were studied.Whether the formation membranes have the desired structure were characterized by Fourier transform infrared spectroscopy,and the ion exchange capacity,swelling degree,tensile strength,elongation at break,permeability and resistance of the membranes were determined to optimize the performance of anion exchange membranes.The results showed that the optimum condition for preparation of the membranes was quaternization 5h,the solvent evaporation temperature was 50? and the molar ratio of DMAEMA to BPPO was 1:1,the resistance of the obtained membrane was 0.93 ?·cm2.In the RED stack,On the base of exploring the method of using an Autolab potentiostat in the chronopotentiometry mode to measure the RED discharge performance,this paper investigated the effect of the feed direction,feed circulation,feed velocity of river water and sea water on the RED power density performance,respectively.The results indicated that river water and sea water are fed from the bottom of the RED stack,the output of the feed liquid is not recycled and increased the feed flow rate are benefit for outputting power density.Besides,In artificial river water and seawater system,the maximum power density of RED stack install with tailor-made AEM and commercial available commercial CEM1 is 1.77 W/m2,higher than the power density of RED stack install with commercial AEM1 and CEM1(1.65 W/m2).therefore this tailor-made low resistance AEM has better application prospects in RED.