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首页> 外文期刊>RSC Advances >Quaternized polysulfone and graphene oxide nanosheet derived low fouling novel positively charged hybrid ultrafiltration membranes for protein separation
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Quaternized polysulfone and graphene oxide nanosheet derived low fouling novel positively charged hybrid ultrafiltration membranes for protein separation

机译：季铵化聚砜和氧化石墨烯纳米片衍生的低结垢新型带正电杂化超滤膜，用于蛋白质分离

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摘要

Low fouling novel positively charged hybrid ultrafiltration membranes with adjustable charge density were fabricated from blends of polysulfone (PSf) and quaternized polysulfone (QPSf) in combination with varied fractions of graphene oxide (GO) nanosheets by a non-solvent induced phase separation method. Fourier transform infrared spectroscopy in the attenuated total reflection mode, scanning electron microscopy, outer surface zeta potential and contact angle studies were conducted to characterize the morphologies of hybrid membranes, structures, charge and surface properties. Results confirmed the fabrication of porous, hydrophilic and positively charged membranes. The water permeabilities (flux) and antifouling ability of membranes with protein solution were dependent on the fraction of quaternary ammonium groups and GO nanosheets in the membranes matrix. Antifouling ability of membranes was improved after the incorporation of GO nanosheets. In addition, irreversible protein fouling of membranes was substantially decreased with increasing fraction of GO nanosheets (%). The transmission of protein as a function of solution pH and the fraction of GO nanosheets (%) in the membranes was studied for two model proteins (bovine serum albumin; BSA or lysozyme; LYZ). The transmission of BSA or LYZ was controlled by size exclusion and the fraction of GO nanosheets in the membrane matrix. The highest transmission of proteins at their isoelectric points was obtained for membrane containing 2 wt% of GO nanosheets to total weight of polymers.
机译：通过非溶剂诱导相分离法，由聚砜（PSf）和季铵化聚砜（QPSf）的混合物与不同比例的氧化石墨烯（GO）纳米片的混合物制得了具有可调节电荷密度的低污染新型带正电杂化超滤膜。进行了衰减全反射模式的傅里叶变换红外光谱，扫描电子显微镜，外表面ζ电势和接触角研究，以表征杂化膜的形态，结构，电荷和表面性质。结果证实了多孔，亲水和带正电的膜的制备。含蛋白质溶液的膜的透水性（通量）和防污能力取决于膜基质中季铵基团和GO纳米片的比例。掺入GO纳米片后，膜的防污能力得到改善。另外，随着GO纳米片的分数（％）的增加，膜的不可逆蛋白结垢显着减少。对于两种模型蛋白（牛血清白蛋白; BSA或溶菌酶; LYZ），研究了蛋白质作为溶液pH值的传递以及膜中GO纳米片的比例（％）的函数。 BSA或LYZ的传输受尺寸排阻和膜基质中GO纳米片的比例控制。对于包含占聚合物总重量2 wt％的GO纳米片的膜，蛋白质在其等电点的透射率最高。

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