Separation and Purification Technology ( IF 8.1 ) Pub Date : 2019-04-12 , DOI: 10.1016/j.seppur.2019.04.006
Jen Ga Neo , Susilo Japip , Lin Luo , Tai-Shung Chung , Martin Weber , Christian Maletzko
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Boron removal is an important separation process which requires an excessive operational cost owing to the complex nature of boron in aqueous solutions. Polymer-enhanced ultrafiltration (PEUF) has been widely adopted for boron separation due to the low operational cost and high separation productivity. In this study, novel hydroxyl-terminated poly(ethyleneimine) (HPEI) polymers; namely, HPEI-Diol and HPEI-Gluconamide, were designed and synthesized as the boron chelating polymers. A polyphenylenesulfone (PPSU) UF membrane was fabricated to have a pure water permeance of around 82.8 L.m−2.h−1.bar−1 with a molecular weight cut off (MWCO) of around 128 kDa. The boron rejection coefficient of the pristine PPSU UF membrane was as low as 6.38% which was attributed to the negatively charged surface of the PPSU membrane. Introducing either HPEI or HPEI-Diol polymer into the boron feed solution increased the boron rejection of the UF process to around 45%. Meanwhile, the HPEI-Gluconamide polymer was found to possess the highest boron retention efficiency with a boron rejection of around 94% at pH 4, which may be ascribed to the higher number of grafted hydroxyl groups.
中文翻译:
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羟基封端的聚乙烯亚胺聚合物增强的超滤能力,用于除硼
硼的去除是重要的分离过程,由于硼在水溶液中的复杂性质,因此需要大量的操作成本。聚合物增强超滤(PEUF)由于操作成本低和分离生产率高而被广泛用于硼分离。在这项研究中,新型的羟基封端的聚(亚乙基亚胺)(HPEI)聚合物;设计并合成了HPEI-Diol和HPEI-葡糖酰胺作为硼螯合聚合物。制备了聚苯砜(PPSU)UF膜,其纯水渗透率约为82.8 Lm -2 .h -1 .bar -1截留分子量(MWCO)约为128 kDa。原始PPSU UF膜的硼排斥系数低至6.38%,这归因于PPSU膜带负电的表面。向硼进料溶液中引入HPEI或HPEI-Diol聚合物可将UF工艺的硼截留率提高到约45%。同时,发现HPEI-葡糖酰胺聚合物具有最高的硼保留效率,在pH 4下的硼截留率约为94%,这可能归因于较高的接枝羟基数。