Formation and characterization of (melamine-TMC) based thin film composite NF membranes for improved thermal and chlorine resistances
Formation and characterization of (melamine-TMC) based thin film composite NF membranes for improved thermal and chlorine resistances
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DOI：
10.1016/j.memsci.2012.08.017
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发表时间：
2013-01-01
影响因子：
9.5
通讯作者：
Han, Runlin
中科院分区：
文献类型：
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作者：
Han, Runlin
为了提高纳滤膜的耐热性和耐氯性，人们做了许多努力。本研究选择界面聚合（IP）制备TFC膜，因为用IP法制备的TFC膜具有较高的通量。采用全芳环和三嗪环的聚三聚氰胺/三甲酰氯（TMC）制备复合纳滤膜的功能层，并采用增强聚醚酰（PEI）超滤（UF）膜作为支撑层。研究了反应时间和单体浓度对膜性能的影响。当三聚氰胺浓度为2.0%，反应时间为40 s，固化温度为70℃时，得到了复合膜的最佳制备条件。在1.0 MPa和20℃条件下，复合纳滤膜的通量约为34 L/m(2) h， Na2SO4的截除率约为77.8%。通过扫描电镜（SEM）观察复合膜和基底膜的表面形貌。与相同条件下制备的聚哌嗪酰胺/TMC酰胺纳滤膜相比，所制备的复合膜具有优异的耐热性和耐氯性。当操作温度从18℃升高到95℃时，聚（三聚氰胺/TMC）复合膜的通量从32 L/m(2) h增加到138 L/m(2) h， Na2SO4的去除率没有下降，聚（三聚氰胺/TMC）酰胺在氯溶液（nacl, 200 ppm）中浸泡96 h，性能没有下降。(C) 2012 Elsevier B.V.版权所有
Numerous efforts have been made to improve the thermal resistance and chlorine resistance of nanofiltration (NF) membranes. In this work, interfacial polymerization (IP) is selected for preparing TFC membranes because TFC membranes prepared with the IP method can provide high fluxes. Poly(melamine/trimesoyl chloride (TMC)) with all aromatic rings and triazine rings is used to fabricate the functional layer of the composite NF membrane and a reinforced polyetherimde (PEI) ultrafiltration (UF) membrane is used as the support layer. The effects of the reaction time and the effects of the monomer concentration on the membrane performance are studied in detail in this work. When the melamine concentration is 2.0%, reaction time is 40 s and the curing temperature is 70 degrees C, the optimized preparation conditions of the composite membrane are reached. The flux of the composite NF membrane is about 34 L/m(2) h and its Na2SO4 rejection is about 77.8% when it is tested at 1.0 MPa and 20 degrees C. The surface morphologies of the composite membrane and substrate membrane are observed by scanning electron microscopy (SEM). The prepared composite membrane shows excellent thermal resistance and chlorine resistance compared with the poly(piperazine amide/TMC) amide NF membrane prepared at the same condition. The flux of poly(melamine/TMC) composite membrane increases from 32 to 138 L/m(2) h while the rejection of Na2SO4 does not decrease when the operation temperature is elevated from 18 degrees C to 95 degrees C. The performance of poly(melamine/TMC) amide does not decline during 96 h immersion in chlorine solution (NaClO, 200 ppm). (C) 2012 Elsevier B.V. All rights reserved.