Aminated polysulfone/TiO2 composite membranes for an effective removal of Cr(VI)
Aminated polysulfone/TiO2 composite membranes for an effective removal of Cr(VI)
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DOI：
10.1016/j.cej.2015.08.116
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发表时间：
2016-01-01
影响因子：
15.1
通讯作者：
Soontarapa, Khantong
中科院分区：
文献类型：
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作者：
Jyothi, M. S.;Nayak, Vignesh;Soontarapa, Khantong
将疏水超滤（UF）聚砜（PSI）引入胺基，通过化学改性将其转化为亲水性聚合物。氨化是通过硝化到PSf，然后用Na2S2O4还原实现的。通过NMR、ATR-IR、DSC和TGA对改性聚合物（aPSf）进行了表征。利用纳米填料进一步将aPSf制成复合膜。采用XRD、SEM和离子交换容量（IEC）对制备的膜进行了表征。XRD分析表明，由于胺基引起的过量内应力，TiO2由锐钛矿转变为金红石。对膜的吸水性（WU）、接触角（CA）和纯水通量（PWF）进行了分析，研究了膜的亲水性和性能。这些膜进一步被认为是一种新的通过排斥/分离工艺去除铬的方法。根据膜的表面电荷特性、纳米填料的用量、pH值和反离子对截留过程的干扰，基本上可以实现100%的分离。(C) 2015年Elsevier B.V.出版
A hydrophobic, ultrafiltration (UF), polysulfone (PSI) was reformed into a hydrophilic polymer by introducing amine groups via chemical modification. The amination was achieved by nitration to PSf followed by reduction using Na2S2O4. The modified polymer (aPSf) was characterized by NMR spectroscopy, ATR-IR, DSC and TGA. aPSf was further made into a composite membrane by using nano fillers. The prepared membranes were characterized by XRD, SEM and ion exchange capacity (IEC). The transformation in phase of TiO2 from anatase to rutile due to excess internal strain caused by amine groups was revealed by XRD patterns. Water uptake (WU), contact angle (CA) and pure water flux (PWF) were analyzed to study the hydrophilicity and performance of the membranes. These membranes were further considered for a novel approach of chromium removal by rejection/separation process. Essentially 100% separation was achieved depending on the surface charge properties of membrane, dosage of nano fillers, pH and interference of counter ions on rejection process. (C) 2015 Published by Elsevier B.V.