Abstract:

Salinity gradient energy, existing widely in nature, could be converted into electrical energy with the utilizing of reverse electrodialysis(RED) technology. In this paper, similar with the design of RED, the chemical potential gradients from waste acid discharge in the industrial process was utilized. An acid diffusion dialysis power generation device was assembled by the alternating configuration of proton-blocking membranes and acid diffusion dialysis membranes. The conversion efficiency of acidity gradient was improved by preparing different proton-blocking membranes. Meanwhile, the effect of electrode rinse solution on the efficiency of electricity production was explored. The experimental results showed that the mixed solution of 0.05 mol/L K₃[Fe(CN)₆], 0.05 mol/L K₄[Fe(CN)₆] and 0.25 mol/L NaCl had higher capacity. It is also found that the capacity of power generation didn't improved by the increase of inlet acid concentration. In the four prepared polymer-coated membranes, the CTA-based Cyphos IL 101-carried PIM showed the best performance as proton-blocking membranes in this device. In addition,a more in-depth analysis of the PIM membrane ratios with CTA as the substrate and Cyphos IL 101 as the carrier revealed that Aliquat 336 had the best performance at 60% of the membrane composition ratio in terms of capacity, with a power density of 43.89 μW/cm².

Key words: reverse electrodialysis, proton-blocking membranes, waste acid power generation

摘要：

自然界中广泛存在盐差能，利用反电渗析技术可以将盐差能转化为电能，是一种新型的可再生能源技术。仿照反电渗析技术将工业过程中所排放废酸中蕴含的化学势能利用起来，将阻氢膜和酸扩散渗析膜交替排布，组装了酸扩散渗析发电装置。并通过制备不同的阻氢膜提高了酸差转化为电能的效率。同时，探讨了电极液对产电效率的影响。实验结果表明，0.05 mol/L K₃［（Fe（CN）₆］、0.05 mol/L K₄［Fe（CN）₆］和0.25 mol/L NaCl组成的混合溶液的电极液产能更高。酸浓度的提升对于电极液产能的提升效果逐渐减弱。自制4种聚合物包覆膜（PIM）作为阻氢膜，其中三醋酸纤维素（CTA）为基底，三己基十四烷基氯化膦（Cyphos IL 101）为载体的PIM在装置中有更好的表现。此外，对该PIM进行了更深入的分析，发现甲基三辛基氯化铵（Aliquat 336）在膜组成比例中占60%时，产能有最好表现，最高功率密度达到43.89 μW/cm²。

关键词: 反电渗析, 阻氢膜, 废酸发电

CLC Number: 

• X703.1