Enhancing antifouling property of polysulfone ultrafiltration membrane by grafting zwitterionic copolymer via UV-initiated polymerization
Enhancing antifouling property of polysulfone ultrafiltration membrane by grafting zwitterionic copolymer via UV-initiated polymerization
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DOI：
10.1016/j.memsci.2009.05.041
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发表时间：
2009-10
影响因子：
9.5
通讯作者：
Haijun Yu;Yiming Cao;Guodong Kang;Jianhui Liu;Li Meng;Q. Yuan
中科院分区：
文献类型：
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作者：
Haijun Yu;Yiming Cao;Guodong Kang;Jianhui Liu;Li Meng;Q. Yuan
以二苯甲酮（BP）为引发剂，在聚砜（PSF）超滤膜表面接枝一种新型两性离子分子--[3-（甲基丙烯酰氨基）丙基]-二甲基（3-磺丙基）氢氧化铵内盐（MPDSAH），以改善聚砜超滤膜的亲水性。在长波长紫外光（λ> 300 nm）照射下，通过甲基基团的脱氢作用抑制了聚合物链的断裂，从而避免了聚砜超滤膜的光降解。考察了MPDSAH浓度、紫外光照射时间和BP浓度对接枝率的影响，并对膜的耐水性进行了改善。采用衰减全反射傅里叶变换红外光谱（FTIR/ATR）和扫描电子显微镜（SEM）对膜表面的化学和形态变化进行了表征。静态接触角（CA）的测量结果表明，MPDSAH改性聚砜超滤膜的亲水性增强与接枝度的增加。改性后膜的纯水通量略有下降，但对牛血清白蛋白（BSA）的截留率有所提高。MPDSAH改性膜的耐水性的提高与接枝率的增加相一致。此外，与聚砜膜相比，改性膜在较宽的pH范围内都能保持较高的水通量。
A new kind of zwitterionic molecule, [3-(methacryloylamino)propyl]-dimethyl (3-sulfopropyl) ammonium hydroxide inner salt (MPDSAH) was grafted onto polysulfone (PSF) ultrafiltration membrane surface using benzophenone (BP) as the initiator to improve the antifouling property. Polymer chain scission was suppressed by H-abstraction from methyl groups under long-wavelength UV irradiation (λ>300nm), which avoided the photodegradation of PSF ultrafiltration membrane. The effects of MPDSAH concentration, UV irradiation time and BP concentration on grafting degree (GD) and the improvement of membrane antifouling properties were investigated, respectively. Attenuated total reflectance Fourier transform infrared spectroscopy (FTIR/ATR) and scanning electron micrograph (SEM) were used to characterize the chemical and morphological changes of the membrane surface. Static contact angle (CA) measurements showed that the hydrophilicity of MPDSAH-modified PSF ultrafiltration membranes was enhanced with the increase of grafting degree. The flux of pure water decreased slightly after modification, while the rejection to bovine serum albumin (BSA) increased. The improvement of antifouling property for MPDSAH-modified membrane was accordant with the increase of grafting degree. In addition, compared to PSF membrane, the modified membranes could maintain a higher water flux in wide pH range.