Optimum content of incorporated nanomaterials: Characterizations and performance of mixed matrix membranes a review

Abstract

Environmental concerns about chemical and biological pollution of water are of alarming proportions. Therefore, various polymeric membranes with improved mechanical and physico-chemical qualities for water treatment were developed using mixed matrix membranes (MMMs) or nanoparticles (NPs) embedded with the membranes. However, the problem of fouling and consequent higher operating and membrane replacement costs are barriers to the use of membrane technology. Therefore, a deeper comprehension of membrane fouling is not only essential for finding solutions but also a crucial factor in the development of membrane technology. The conventional blending modification would result in a large number of nanoparticles in the polymer matrix. In reality, the aggregation of nanoparticles in composite membranes is a considerable issue and would result in unfavorable changes to the features of the membrane (e.g. decreased water flux, weakened mechanical strength). In this review, it was looked into the effect of an optimal concentration of the hydrophilic nanoparticle additions to avoid the aggregation of nanoparticles in composite membranes and the reduced of using high amounts of valuable and costly nanoparticles in the membranes production and to obtain better results. The influence of the additives, such as (carbon nanotubes (CNTs), silica (SiO2), titanium dioxide (TiO2), zinc oxide (ZnO), aluminum oxide (Al2O3), and graphene oxide (GO), etc.) was investigated.