首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >Tuning separation behavior of tailor-made thin film poly(piperazine-amide) composite membranes for pesticides and salts from water
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Tuning separation behavior of tailor-made thin film poly(piperazine-amide) composite membranes for pesticides and salts from water

机译:调整量制薄膜聚(哌嗪 - 酰胺)复合膜的分离行为为杀虫剂和水盐的复合膜

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The present study describes some appealing results concerning the TFC membrane performances prepared by varying the solvents of piperizine (viz, water, acetonitrile and water-acetonitrile). The membrane selectivity of bivalent over mono-valent anions reduces from water > acetonitrile-water > acetonitrile (i.e. Memb-I > Memb-II > Memb-III). The partition co-efficient values support the trend. The retention order of salts is Na2SO4 > MgSO4 > MgCl2 > CaCl2 > NaCl. pH dependence separation study shows different behaviors for NaCl, Na2SO4 and MgSO4. Memb-I and II show minimum NaCl separation at pH 7 whereas in acidic and alkaline medium it is increasing trend, but Memb-III shows differences in alkaline pH. On the contrary Memb-I and II show improvement in retention with pH for Na2SO4 and MgSO4, whereas Memb-III shows the fall in retention at alkaline pH. The separation performance of diuron and isoproturon follows order R-isoproturon( 90.95%) > R-diuron(79.34%) for Memb-II at pH 7. The separation performances follow the trend Memb-II > Memb-I > Memb-III. It reflects that acetonitrile-water mixture for piperizine optimizes maximum permeability as well as a charge of the membrane. The higher retention of isoproturon at alkaline pH is explained by higher molecular size and low polarity compared to diuron. The low separation trend of diuron at higher pH may be explained by relatively more polarity and low molecular size. (C) 2016 Elsevier B.V. All rights reserved.
机译:本研究描述了通过改变哌嗪(VIZ,水,乙腈和水 - 乙腈)的溶剂制备的TFC膜性能的一些吸引力结果。单戊类阴离子二价膜选择性从水>乙腈 - 水>乙腈(即MEMB-1> MEMB-II> MEMB-III)中减少。分区协同有效值支持趋势。盐的保留顺序是Na 2 SO 4> MgSO 4> MgCl 2> CaCl 2> NaCl。 pH依赖性分离研究显示NaCl,Na 2 SO 4和MgSO 4的不同行为。 MEMB-I和II显示在pH7的最小NaCl分离,而在酸性和碱性培养基中,它正在增加趋势,但MEMB-III显示碱性pH的差异。在相反的MEMB-I和II上显示出对Na 2 SO 4和MgSO4的pH值的改善,而MEMB-III显示碱性pH的保留下降。 Diuron和Isoproturon的分离性能在pH 7时的MEMB-II的顺序r-Isoproturon(90.95%)> R-Diuron(79.34%)进行r-Isoproturon(90.95%)> R-Diuron(79.34%)。分离性能遵循趋势Memb-II> Memb-I> Memb-III。它反映了哌嗪的乙腈 - 水混合物优化最大渗透性以及膜的电荷。与Diuron相比,通过更高的分子大小和低极性来解释碱性pH下的异丙骨保留率较高。可通过相对较高的极性和低分子尺寸来解释在较高pH下Diuron的低分离趋势。 (c)2016 Elsevier B.v.保留所有权利。

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