表面接枝改性聚酰胺复合反渗透膜及其性能研究
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摘要
以甲基丙烯酸羟乙酯(HEMA)为单体、过硫酸钾-焦亚硫酸钠溶液为引发剂体系,通过在聚酰胺复合膜表面进行接枝聚合改性处理,得到亲水性聚酰胺复合反渗透膜.采用衰减全反射红外光谱、场发射扫描电子显微镜、接触角测量仪等仪器分别对膜表面的化学结构、表面形貌和亲水性能进行表征.结果表明,亲水性单体接枝改性提高了膜的亲水性和抗污染性能,且会影响膜的分离性能;当接枝单体HEMA溶液质量分数为4%时,制备的膜综合性能最好,脱盐率最高为99.67%,水通量为40.7 L/(m~2·h),亲水性和抗污染性能较好.
This study focuses on improving the properties of polyamide thin-film composite(TFC) reverse osmosis(RO) membranes by surface modification. The hydrophilic polyamide composite RO membrane was obtained by grafting hydroxyethyl methacrylate(HEMA) onto the surface of polyamide composite RO membrane by using potassium persulfate and sodium metabisulfite solution as the initiator. The chemical structure, surface morphology and hydrophilicity of the membrane material were characterized by attenuated total reflection infrared spectroscopy(ATR-FTIR), field emission scanning electron microscopy(SEM) and a contact angle measuring instrument, respectively. The results show that the HEMA-grafted membrane had better separation performance and hydrophilicity compared with the original membrane. When the concentration of the HEMA solution reaches 4%, the comprehensive performance of the grafted membrane is best, the desalination rate is as high as 99.67%, the water flux is 40.7 L/(m~2·h), the hydrophilic and the anti-fouling performance are good.
This study focuses on improving the properties of polyamide thin-film composite(TFC) reverse osmosis(RO) membranes by surface modification. The hydrophilic polyamide composite RO membrane was obtained by grafting hydroxyethyl methacrylate(HEMA) onto the surface of polyamide composite RO membrane by using potassium persulfate and sodium metabisulfite solution as the initiator. The chemical structure, surface morphology and hydrophilicity of the membrane material were characterized by attenuated total reflection infrared spectroscopy(ATR-FTIR), field emission scanning electron microscopy(SEM) and a contact angle measuring instrument, respectively. The results show that the HEMA-grafted membrane had better separation performance and hydrophilicity compared with the original membrane. When the concentration of the HEMA solution reaches 4%, the comprehensive performance of the grafted membrane is best, the desalination rate is as high as 99.67%, the water flux is 40.7 L/(m~2·h), the hydrophilic and the anti-fouling performance are good.
引文
[1] 高从堦, 杨尚保. 反渗透复合膜技术进展和展望[J]. 膜科学与技术, 2011, 31(3):1-4.
[2] 曹震, 魏杨杨, 赵曼,等. 反渗透复合膜研究进展与展望[J]. 水处理技术, 2016, 42(9):10-21.
[3] 潘春佑, 徐国荣, 李霞,等. 聚酰胺反渗透复合膜改性技术研究进展[J]. 膜科学与技术, 2016, 36(6):133-138.
[4] 杜世媛, 王俊, 林春儿,等. 芳香族聚酰胺膜材料研究进展[J]. 膜科学与技术, 2016, 36(5):124-131.
[5] 秦嘉旭, 张林, 候立安. 耐污染反渗透/纳滤复合膜研究进展[J]. 中国工程科学, 2014, 16 (7):29-35.
[6] 李银, 张林. 抗生物污染反渗透膜的研究进展[J]. 膜科学与技术, 2018, 38(2):111-118.
[7] Zhang Y, Wan Y, Pan G, et al. Surface modification of polyamide reverse osmosis membrane with sulfonated polyvinyl alcohol for antifouling[J].Appl Surf Sci, 2017, 419:177-187.
[8] Chen L, Wu L, Zhang H, et al. Tris(hydroxymethyl)aminomethane polyamide thin-film-composite antifouling reverse osmosis membrane[J].J Appl Polym Sci, 2017, 45891:1-8.
[9] Yu C, Li H, Zhang X, et al. Polyamide thin-film composite membrane fabricated through interfacial polymerization coupled with surface amidation for improved reverse osmosis performance[J]. J Membr Sci, 2018, 566:87-95.
[10] Kang G, Liu M, Lin B, et al. A novel method of surface modification on thin-film composite reverse osmosis membrane by grafting poly(ethylene glycol)[J]. Polym, 2007, 48:1165-1170.
[11] Kang G, Yu H, Liu Z, et al. Surface modification of a commercial thin film composite polyamide reverse osmosis membrane by carbodiimide-induced grafting with poly(ethylene glycol)derivatives[J]. Desalination,2011, 275:252-259.
[12] Liu M, Chen Q, Wang L, et al. Improving fouling resistance and chlorine stability of aromatic polyamide thin-film composite RO membrane by surface grafting of polyvinyl alcohol(PVA)[J]. Desalination, 2015, 367:11-20.
[13] Hu Y, Lu K, Yan F, et al. Enhancing the performance of aromatic polyamide reverse osmosis membrane by surface modification via covalent attachment of polyvinyl alcohol(PVA)[J]. J Membr Sci, 2016, 501:209-219.
[14] Gilron J, Belfer S, Vaisanen P, et al. Effects of surface modification on antifouling and performance properties of reverse osmosis membranes[J]. Desalination, 2001, 140:167-179.
[15] Freger V, Gilron J, Belfer S. TFC polyamide membranes modified by grafting of hydrophilic polymers: an FT - IR/AFM/TEM study[J]. J Membr Sci, 2002, 200:283-292.
[16] Zhang Z, Wang Z, Wang J, et al. Enhancing chlorine resistances and anti-biofouling properties of commercial aromatic polyamide reverse osmosis membranes by grafting 3-allyl-5,5-dimethylhydantoin and N,N′ - methylenebis(acrylamide)[J]. Desalination, 2013, 309:187-196.
[17] 祝振鑫. 膜材料的亲水性、膜表面对水的湿润性和水接触角的关系[J]. 膜科学与技术, 2014, 34(2):1-4.
[2] 曹震, 魏杨杨, 赵曼,等. 反渗透复合膜研究进展与展望[J]. 水处理技术, 2016, 42(9):10-21.
[3] 潘春佑, 徐国荣, 李霞,等. 聚酰胺反渗透复合膜改性技术研究进展[J]. 膜科学与技术, 2016, 36(6):133-138.
[4] 杜世媛, 王俊, 林春儿,等. 芳香族聚酰胺膜材料研究进展[J]. 膜科学与技术, 2016, 36(5):124-131.
[5] 秦嘉旭, 张林, 候立安. 耐污染反渗透/纳滤复合膜研究进展[J]. 中国工程科学, 2014, 16 (7):29-35.
[6] 李银, 张林. 抗生物污染反渗透膜的研究进展[J]. 膜科学与技术, 2018, 38(2):111-118.
[7] Zhang Y, Wan Y, Pan G, et al. Surface modification of polyamide reverse osmosis membrane with sulfonated polyvinyl alcohol for antifouling[J].Appl Surf Sci, 2017, 419:177-187.
[8] Chen L, Wu L, Zhang H, et al. Tris(hydroxymethyl)aminomethane polyamide thin-film-composite antifouling reverse osmosis membrane[J].J Appl Polym Sci, 2017, 45891:1-8.
[9] Yu C, Li H, Zhang X, et al. Polyamide thin-film composite membrane fabricated through interfacial polymerization coupled with surface amidation for improved reverse osmosis performance[J]. J Membr Sci, 2018, 566:87-95.
[10] Kang G, Liu M, Lin B, et al. A novel method of surface modification on thin-film composite reverse osmosis membrane by grafting poly(ethylene glycol)[J]. Polym, 2007, 48:1165-1170.
[11] Kang G, Yu H, Liu Z, et al. Surface modification of a commercial thin film composite polyamide reverse osmosis membrane by carbodiimide-induced grafting with poly(ethylene glycol)derivatives[J]. Desalination,2011, 275:252-259.
[12] Liu M, Chen Q, Wang L, et al. Improving fouling resistance and chlorine stability of aromatic polyamide thin-film composite RO membrane by surface grafting of polyvinyl alcohol(PVA)[J]. Desalination, 2015, 367:11-20.
[13] Hu Y, Lu K, Yan F, et al. Enhancing the performance of aromatic polyamide reverse osmosis membrane by surface modification via covalent attachment of polyvinyl alcohol(PVA)[J]. J Membr Sci, 2016, 501:209-219.
[14] Gilron J, Belfer S, Vaisanen P, et al. Effects of surface modification on antifouling and performance properties of reverse osmosis membranes[J]. Desalination, 2001, 140:167-179.
[15] Freger V, Gilron J, Belfer S. TFC polyamide membranes modified by grafting of hydrophilic polymers: an FT - IR/AFM/TEM study[J]. J Membr Sci, 2002, 200:283-292.
[16] Zhang Z, Wang Z, Wang J, et al. Enhancing chlorine resistances and anti-biofouling properties of commercial aromatic polyamide reverse osmosis membranes by grafting 3-allyl-5,5-dimethylhydantoin and N,N′ - methylenebis(acrylamide)[J]. Desalination, 2013, 309:187-196.
[17] 祝振鑫. 膜材料的亲水性、膜表面对水的湿润性和水接触角的关系[J]. 膜科学与技术, 2014, 34(2):1-4.