Where is the best site for loading nanoparticles in a membrane? To achieve a high flux and cephalexin separation simultaneously
Where is the best site for loading nanoparticles in a membrane? To achieve a high flux and cephalexin separation simultaneously
复制标题
DOI：
10.1016/j.jwpe.2020.101578
复制
发表时间：
2020-12
影响因子：
7
通讯作者：
R. Karimi;M. Homayoonfal;F. Davar
中科院分区：
文献类型：
--
作者：
R. Karimi;M. Homayoonfal;F. Davar
在本研究中，为了同时实现高通量和头孢氨苄抗生素的截留率，对膜顶层（选择层）和基底层（支撑层）进行了单独的改性。合成了Fe 3 O 4（Fe）和ZrO 2（Zr）纳米粒子用于PAN支撑层的改性，合成了Fe 3 O 4/ZrO 2（FZ）纳米粒子用于PA顶层的改性。在这方面，合成了五种类型的纳米复合膜：为了调节支撑层的孔隙率，合成了P A F e 2@P A N和P A Z r 2@P A N膜，其显示出比P A P A N膜更多的孔数。为了提高膜表面的亲水性，制备了F Z 2@P A P A N膜，与P A P A N膜相比，F Z 2@P A P A N膜的接触角降低了16%，粗糙度提高了58%。为了补偿膜表面产生的粗糙度，在顶层和支撑层上同时进行改性;合成了F Z 2@P A F e 2@P A N和F Z 2@P A Z r 2@P A N膜，其对头孢氨苄的分离率为91%和95.8%。与商品膜（NF 2 70 - 2 4 5 0）的性能比较表明，F Z 2@PA Z r 2@PA N的头孢氨苄截留率（95±1）和通量恢复率（99±1）与商品膜的头孢氨苄截留率（98±1）和通量恢复率（96±1）基本相同。从渗透的观点来看，F Z 2@P A Z r 2@P A N膜在4巴的跨膜压力和0.5 m/s的错流速度下具有49 L/m2的水通量。h，头孢氨苄通量为38 L/m2。h，而NF 270 -2450在相同条件下的水通量为42 L/m2。h，头孢氨苄通量为2 5L/m2。H.
In this research, with the aim of achieving a high flux and rejection of cephalexin antibiotic simultaneously, separate modifications were performed on the membrane top layer (selective layer) and substrate layer (support layer). Fe 3 O 4 (Fe) and ZrO 2 (Zr) nanoparticles were synthesized for modifying the PAN support layer, while Fe 3 O 4/ZrO 2 (FZ) nanoparticles were synthesized for modifying the PA top layer. In this regard, five types of nanocomposite membranes were synthesized: In order to regulate the porosity of the support layer, P A F e 2@ P A N and P A Z r 2@ P A N membranes were synthesized which showed more pores number compared to P A P A N membrane. In order to enhance the surface hydrophilicity, F Z 2@ P A P A N membrane was synthesized, which showed around 16% lower contact angle and 58% greater roughness compared to P A P A N membrane. In order to compensate for the roughness developed on the membrane surface, concurrent modifications were performed on the top and support layers; the F Z 2@ P A F e 2@ P A N and F Z 2@ P A Z r 2@ P A N membranes were synthesized, which separated cephalexin by 91% and 95.8%. Comparison of the performance of the synthesized membrane with that of commercial FILMTEC (NF270-2450) membrane showed that the cephalexin rejection (95±1) and flux recovery (99±1) of F Z 2@ P A Z r 2@ P A N are almost the same as cephalexin rejection (98±1) and flux recovery (96±1) of commercial membrane. From permeation point of view, F Z 2@ P A Z r 2@ P A N membrane at transmembrane pressure of 4 bar and cross flow velocity of 0.5 m/s had a water flux of 49 L/m 2. h and cephalexin flux of 38 L/m 2. h, while NF270-2450 at the same condition had a water flux of 42 L/m 2. h and cephalexin flux of 25 L/m 2. h.