Chemical Engineering Communications ( IF 2.5 ) Pub Date : 2021-06-07 , DOI: 10.1080/00986445.2021.1935253 Elif Demirel 1 , Sakhavat Dadashov 1
Abstract
In the present study, silica coated multi-walled carbon nanotubes (SiO2-CNT) were embedded into a pristine polyvinylidene fluoride (PVDF) polymer matrix to develop a novel PVDF/SiO2-CNT nanocomposite membrane. Initially, SiO2-CNT nanofillers were synthesized through sol gel method using commercial multi-walled carbon nanotubes (f-CNT) and incorporated into membrane matrix with varying loadings of 0.5%wt. and 1.0%wt. Pore former/polymer/solvent ratio was investigated to achieve the highest pure water flux and rejection in order to determine the most suitable pristine membrane recipe. Filtration performance properties such as flux, sodium alginate rejection, antifouling properties as well as the morphological characteristics such as porosity, pore size and distribution, hydrophilicity, surface roughness, functional groups, crystalline structure, thermal properties and mechanical strength of the SiO2-CNT embedded membranes fabricated with the best recipe were determined in comparison to those of pristine membrane. It has been demonstrated that incorporating hydrophilic SiO2-CNT into PVDF matrix increased the permeability from 303 to 377 L/m2h (25% increment) due to the improved dispersion of nanoparticles, which subsequently resulted in enhanced morphological properties. In addition to that, SA rejection of the pristine membrane increased from 84.5% to 90.2% and the flux recovery ratio increased from %74.2 to 94.7% with a comparatively smaller Rir value of 2.4 x 1010 m−1 by the addition of 0.5% SiO2-CNT nanofillers into the polymer matrix. Si-MWCNT impregnated nanocomposite membranes not only exhibited better filtration properties but also improved thermal stability and mechanical properties through the synergetic effect of nanotubes and silica group, which would provide in a significant increase in membrane life.
中文翻译:
制备具有改进过滤性能的新型 PVDF 基二氧化硅涂层多壁碳纳米管嵌入膜
摘要
在本研究中,将二氧化硅涂层的多壁碳纳米管 (SiO 2 -CNT) 嵌入到原始的聚偏二氟乙烯 (PVDF) 聚合物基质中,以开发新型 PVDF/SiO 2 -CNT 纳米复合膜。最初,SiO 2-CNT 纳米填料通过溶胶凝胶法使用商用多壁碳纳米管 (f-CNT) 合成,并以 0.5%wt 的不同负载量掺入膜基质中。和 1.0% 重量。研究了成孔剂/聚合物/溶剂的比例,以获得最高的纯水通量和截留率,以确定最合适的原始膜配方。SiO 2的助熔剂、海藻酸钠截留率、防污性能等过滤性能特性以及孔隙率、孔径和分布、亲水性、表面粗糙度、官能团、晶体结构、热性能和机械强度等形态特征- 与原始膜相比,确定了以最佳配方制造的 CNT 嵌入膜。已经证明,将亲水性 SiO 2 -CNT 掺入 PVDF 基体中,由于纳米粒子的分散性得到改善,渗透性从 303 增加到 377 L/m 2 h(增加 25%),随后导致形态学性质增强。除此之外,原始膜的 SA 截留率从 84.5% 提高到 90.2%,通量回收率从 %74.2 提高到 94.7%,通过添加 0.5, R ir值相对较小,为 2.4 x 10 10 m -1 % SiO 2-CNT纳米填料进入聚合物基质。Si-MWCNT浸渍纳米复合膜不仅表现出更好的过滤性能,而且通过纳米管和二氧化硅基团的协同作用提高了热稳定性和机械性能,这将显着提高膜的使用寿命。