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Size separation of Fe2O3 nanoparticles via membrane processing

机译：Fe2O3纳米颗粒的膜分离

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The present work proposed a membrane processing for size separation of polydispersed nanosized ferric oxide hydrates,where desalination was first achieved with polyvinylidene fluoride(PVDF)ultrafiltration(UF)membrane of 100kDa molecular weight cut-off(MWCO),and fractionation was then realized by using cellulose acetate(CA)microfiltration(MF)membrane of 5(Jim pore size.X-ray diffraction(XRD),transmission electron microscope(TEM)and scanning electron microscope(SEM)were employed to examine size and morphology of Fe2O3 nanoparticles before and after fractionation.Specific surface areas were also determined by using the Brunauer-Emmett-Teller(BET)method.Before fractionation,the mean nanoparticle size of the feed was within 45.2-49.8 nm.After fractionation,the permeate and the retentate were found to have a smaller size(36.7-39.8 nm)and a larger size(52.4-56.9 nm),respectively.Furthermore,as compared with the feed,a smaller disperse coefficient was found for both permeate and retentate.These results demonstrated that membrane separation technique was an efficient way to achieve fractionation of Fe2O3 nanoparticles.
机译：本工作提出了一种用于多分散纳米级三氧化二铁水合物尺寸分离的膜处理方法，首先用截留分子量为100kDa的聚偏二氟乙烯（PVDF）超滤（UF）膜进行脱盐，然后通过用醋酸纤维素（CA）微滤（MF）膜（孔径为5Jim）进行过滤，然后用X射线衍射（XRD），透射电子显微镜（TEM）和扫描电子显微镜（SEM）检查Fe2O3纳米粒子的尺寸和形貌。还使用Brunauer-Emmett-Teller（BET）方法确定比表面积。分馏前，进料的平均纳米粒度在45.2-49.8 nm之内。分馏后，发现了渗透物和截留物分别具有较小的尺寸（36.7-39.8 nm）和较大的尺寸（52.4-56.9 nm）。此外，与进料相比，渗透液和截留液的分散系数均较小。结果表明，膜分离技术是实现Fe2O3纳米颗粒分级分离的有效方法。

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