In this study, polyethersulfone based nanofiltration membranes were modified by air plasma generated through dielectric barrier discharge to increase the membrane hydrophilicity aiming to improve the separation and antifouling characteristics. The effect of plasma time on the physico-chemical and separation properties of membrane was investigated. The PES nanofiltration membranes were fabricate...

In several processing industries, separation of different components from a mixture is an important unit operation. Sometimes the separated component is an important product, and in some instances it is a waste product. There is a variety of technologies available for use in separations, each operating based on physical and chemical properties of the mixture. One of the fundamental separation p...

One of the most well-established frameworks for modeling multicomponent transport in nanofiltration (NF) is Donnan-Steric Pore Model with Dielectric Exclusion (DSPM-DE). Conventional DSPM-DE characterizes across NF membranes through four governing membrane parameters: (1) pore radius; (2) effective thickness; (3) charge density; and (4) dielectric constant inside pores. The process quantifying ...

3D printed nanofiltration (NF) composite membranes with surface patterns minimising the impact of concentration polarisation (CP) are presented here for first time. The consist a NF polydopamine?coated polyvinylidene fluoride (PVDF/PDA) selective layer on asymmetric wavy (patterned) support. result is membrane pure water permeance 14 ± 2 LMH bar ? 1 and molecular weight cut-off ?550 Da, measure...

In this work, we investigate the effect of membrane surface chemistry on fouling in water treatment for polyelectrolyte multilayer based nanofiltration (NF) membranes. The approach allows us to prepare three membranes with same active separation layer, apart from a difference chemistry: nearly uncharged crosslinked Poly(allylamine hydrochloride) (PAH), strongly negative poly(sodium 4-styrene su...

A methodology for calcium sulfate (gypsum) scale control in nanofiltration of saline waters is presented. The methodology involves the use of both theoretically and experimentally determined parameters. Pitzer’s thermodynamic equations for electrolytes are used to determine the gypsum scaling potential of the feed water based on its ionic composition, whereas the extent of concentration polariz...

Composite Nanofiltration membranes were fabricated by incorporating Carbon Nanotubes (CNT) and Polyvinylidene Fluoride (PVDF) membranes. A suspension was prepared by dispersing CNT (30 minutes of sonication) in Dimethyl Sulfoxide (DMSO) solvent for 0.5 mg/ml. This suspension after vacuum filtration dispersed over PVDF membrane of pore size 0.22μm. Excess DMSO was removed by washing using Ethano...

Water scarcity has been recognized as one of the major threats to human activity, and, therefore, water purification technologies are increasingly drawing attention worldwide. Nanofiltration (NF) membrane technology has been proven to be an efficient and cost-effective way in terms of the size and continuity of the nanostructure. Using a template based on hexagonal lyotropic liquid crystals (LL...

Conventional commercially available nanofiltration (NF) membranes show limited stability at extreme pH conditions, whereas NF that can cope with these conditions often (too) low permeance or are relatively open. Since applications in many industrial sectors require stable a range of molecular weight cut-offs (MWCO), including tight membranes, substantial research and development efforts being d...

Nanofiltration (NF) membrane processes are attractive to remove multivalent ions. As ion retention in NF membranes is determined by both size and charge exclusion, negatively charged required reject Layer-by-layer assembly of alternating polycation (PC) polyanion layers on top a support versatile method produce membranes. Especially the polyelectrolyte (PE) couple polydiallyldimethylammoniumchl...