复合催化剂对聚酰胺纳滤膜结构和性能的影响
作者:王元,王磊,王旭东,呼佳瑞,吕永涛
单位: 西安建筑科技大学环境与市政工程学院,陕西 西安 710055
关键词: 纳滤膜;界面聚合;复合催化剂;超薄功能层
分类号: TQ316.4
出版年,卷(期):页码: 2015,35(3):1-6

摘要:
以聚砜(PSF)为基膜,间苯二胺(MPD)和均苯三甲酰氯(TMC)为反应单体,通过界面聚合制备聚酰胺复合纳滤膜。考察了复合催化剂三乙胺(TEA)和樟脑磺酸(CSA)及反应条件,对纳滤膜功能层结构和性能的影响。结果表明:在反应体系中,TEA和CSA的物质的量比为1/2时,随着复合催化剂中TEA的用量从0.5 wt%增加到3 wt%,纳滤膜功能层密度增大,表面粗糙度和亲水接触角下降,膜通量明显升高,但纳滤膜的截留率及其对盐的选择顺序基本不变。在TEA含量为2 wt%,反应时间40 s,热处理温度80 °C,热处理时间3 min的最优条件下,所得复合纳滤膜对2 g/LMgSO4溶液的截留率为93.2%,通量为16 L/m2h。在0.2~1.0 MPa的操作压力下,聚酰胺复合纳滤膜分离性能稳定。
 
Abstract:Polyamide thin-film composite membrane was prepared through interfacial polymerization between m-phenylenediamine (MPD) and trimesoyl chloride (TMC) on the polysulfone (PSF) support membrane. The effect of the composite catalyst (triethylamine (TEA) and camphorsulfonic acid (CSA) ), as well as the reaction conditions on the ultra-thin poly skin layer structure and performance of the nanofiltration membrane were systematically investigated. Results show that the the ultra-thin skin layer density increased, the surface roughness and the hydrophilicity contact angle decreased, and the water flux increased dramatically, while  the changes to the rejection and the selecting sequence for salt of nanofiltration membrane have been very minor, as the TEA concentration in the composite catalyst increased from 0.5 wt % to 3 wt % and the molar ratio of TEA and CSA  fixed at 1/2. When the concentration of TEA is 2 wt%, reaction time is 40 s, curing temperature is 80°C, curing time is 3 min,the composite nanofiltration membrane exhibited good performance that the rejection of 2 g/L MgSO4 solution was 93.2% , and the water flux was 16 L/m2h. Polyamide thin-film composite separation performance was stable at 0.2 ~ 1.0 MPa.
 

基金项目:
国家自然科学基金项目(No.51178378; No.51278408);陕西省科技创新(No.2012KTCL03-06;No.2013KTCL03-16);

作者简介:
西安建筑科技大学创新团队;作者简介:王元 (1989—),女,山东济宁人,硕士研究生,主要从事聚酰胺复合纳滤膜制备研究,834956462@qq.com,18220482473;王磊(1971—),男,教授,博士生导师,主要从事水污染控制及废水再生等理论与技术的研究,通讯联系人,wl0178@126.com,西安建筑科技大学环境与市政工程学院,邮编710055

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