以甲基丙烯酰氧乙基三甲基氯化铵(DMC)作为接枝单体,采用紫外光接枝的方法对聚醚砜(PES)纳滤膜表面进行改性来制备荷正电纳滤膜。研究了辐照时间、单体浓度对膜分离性能的影响,得出最佳接枝反应条件是:辐照时间为7min,单体浓度为50%(wt,质量分数)。在压力为0.1MPa条件下,改性纳滤膜对5种染料的截留率大小顺序为:酸性铬蓝K(98.3%)>结晶紫(95.5%)>碱性红2(94.0%)>碱性品绿(91.5%)>酸性橙7(89.0%),这是位阻效应与道南排斥效应共同作用的结果。
The surface of polyethersulfone (PES) nanofiltration membrane was modified with methacryloxyethyltrimethyl ammonium chloride (DMC) as grafting monomer by UV light.The effects of irradiation time and monomer concentration on the separation performance of membrane were studied.The optimum grafting conditions were as follows:irradiation time was 7min and the monomer concentration was 50wt%.At 0.1MPa,the rejection order of the membrane for the five dyes was acid chrome blue K(98.3%)>crystal violet(95.5%)>safranine O(94.0%)>bismarckgreen4(91.5%)>acid orange 7(89.0%),which were the results of the steric hindrance effect and Donnan exclusion effect.
[1] Peydayesh M,Mohammadi T,Bakhtiari O.Effective treatment of dye wastewater via positively charged TETA-MWCNT/PES hybrid nanofiltration membranes[J].Separation & Purification Technology,2017,194:488-502.
[2] 马碧荣.低压大通量纳滤膜的制备及其性能研究[D].宁波:宁波大学,2013.
[3] 邱长泉.紫外接枝制备亲水性纳滤膜的研究[D].上海:复旦大学,2005.
[4] Liu F,Ma B R,Zhou D,et al.Positively charged loose nanofiltration membrane grafted by diallyl dimethyl ammonium chloride (DADMAC) via UV for salt and dye removal[J].Reactive & Functional Polymers,2015,86:191-198.
[5] Deng H Y,Xu Y Y,Chen Q C,et al.High flux positively charged nanofiltration membranes prepared by UV-initiated graft polymerization of methacrylatoethyl trimethyl ammonium chloride (DMC) onto polysulfone membranes[J].Journal of Membrane Science,2011,366(1):363-372.
[6] 孙俊芬.聚醚砜超滤膜微结构和性能的研究[D].上海:东华大学,2002.
[7] Yamagishi H,Crivello J V,Belfort G.Development of a novel photochemical technique for modifying poly (arylsulfone) ultrafiltration membranes[J].Journal of Membrane Science,1995,105(3):237-247.
[8] 周闽湘,袁章军.浅析高中生物学教材中有关染色剂的几个问题[J].生物学通报,2008,43(1):51-52.
[9] Wang Z,Shi B L,Jia L N.Preparation of polyethersulfone nanofiltration membrane by UV photo-grafting and separation for dye solutions[J].Desalination & Water Treatment,2017,92:27-37.
[10] 王松雪.荷正电中空纤维纳滤膜的制备及其在染料纯化工艺上的应用[D].杭州:浙江工业大学,2015.
[11] Makhetha T A,Moutloali R M.Antifouling properties of Cu(tpa)@GO/PES composite membranes and selective dye rejection[J].Journal of Membrane Science,2018,554:195-210.
[12] Ong Y K,Fu Y L,SunS P,et al.Nanofiltration hollow fiber membranes for textile wastewater treatment:lab-scale and pilot-scale studies[J].Chemical Engineering Science,2014,114:51-57.
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