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Optimization of composite nanofiltration membrane through pH control:Application in CuSO_4 removal

机译：通过pH控制优化复合纳滤膜：在CuSO_4去除中的应用

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摘要

An approach to optimize the membrane performance by controlling the acidity or basicity of the diamine solution containing bifunctional piperazine,trifunctional 3,5-diaminobenzoic acid and acidic/basic additive is introduced.It was found that with the addition of sulphuric acid(H_2SO_4),pore radius becomes bigger and the skin layer becomes thinner.On the other hand,the membrane thickness was found to increase with the addition of triethylamine(TEA)whereas the pore radius was not affected by the addition of TEA.The membrane flux increased when the membrane was prepared under acidic condition,however,the mechanical strength of the membrane pores was poor and subjected to severe compaction problem.CuSO_4 rejection under different pore radius was simulated using Donnan steric pore model(DSPM).The simulation result shows that the optimum pore radius to separate CuSO4 should be as close as possible to the size of hydrated Cu~(2+)ion which is around 0.53 nm.The experimental rejections for membrane with different pore radius were compared to the simulated result.It was found that the trend of rejection agreed well with the simulated data which indicated that optimized CuSO_4 removal could be achieved using membrane prepared with the addition of 0.5% sulphuric acid.
机译：介绍了一种通过控制含双官能哌嗪，三官能3,5-二氨基苯甲酸和酸性/碱性添加剂的二胺溶液的酸度或碱性来优化膜性能的方法。结果发现，添加硫酸（H_2SO_4）后，另一方面，随着三乙胺（TEA）的加入，膜的厚度增加，而不受TEA的影响的孔半径增加。在酸性条件下制备膜，但是膜孔的机械强度较差，存在严重的压实问题。使用Donnan空间孔模型（DSPM）模拟了不同孔半径下CuSO_4的截留率。分离CuSO4的半径应尽可能接近水合Cu〜（2+）离子的大小，约为0.53 nm.mem的实验抑制结果表明，截留趋势与模拟数据吻合良好，表明添加0.5％硫酸制备的膜可以实现CuSO_4的最佳去除效果。

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