Water Filtration Membranes Based on Non-Woven Cellulose Fabrics: Effect of Nanopolysaccharide Coatings on Selective Particle Rejection, Antifouling, and Antibacterial Properties.

Blanca Jalvo,Maria-Ximena Ruiz-Caldas,Andrea Aguilar-Sanchez,Aji P Mathew

doi:10.3390/nano11071752

Blanca Jalvo, Maria-Ximena Ruiz-Caldas + Show 2 more

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https://doi.org/10.3390/nano11071752

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Journal: Nanomaterials	Publication Date: Jul 5, 2021
Citations: 14	License type: CC BY 4.0

Affiliation: Stockholm University

Abstract

This article presents a comparative study of the surface characteristics and water purification performance of commercially available cellulose nonwoven fabrics modified, via cast coating, with different nano-dimensioned bio-based carbohydrate polymers, viz. cellulose nanocrystals (CNC), TEMPO-oxidized cellulose nanofibers (T-CNF), and chitin nanocrystals (ChNC). The surface-modified nonwoven fabrics showed an improvement in wettability, surface charge modification, and a slight decrease of maximum pore size. The modification improved the water permeance in most of the cases, enhanced the particle separation performance in a wide range of sizes, upgraded the mechanical properties in dry conditions, and showed abiotic antifouling capability against proteins. In addition, T-CNF and ChNC coatings proved to be harmful to the bacteria colonizing on the membranes. This simple surface impregnation approach based on green nanotechnology resulted in highly efficient and fully bio-based high-flux water filtration membranes based on commercially available nonwoven fabrics, with distinct performance for particle rejection, antifouling and antibacterial properties.

Highlights

Membranes and filters are routinely used in water and wastewater treatment processes due to their reliable removal of contaminants without the addition of new chemicals and the production of harmful products in water treatment processes
[29], we considered adsorption is believed to be one of the first events occurring in such responses [29], we static bovine serum albumin adsorption as a primary to evaluate theevaluate antifouling considered static bovine serum albumin adsorption asmethod a primary method to the properties of the impregnated nonwoven fabrics
Our results showed that cellulose nanocrystals (CNC) and TEMPO-oxidized cellulose nanofibers (T-cellulose nanofibers (CNF)) impregnated fabrics displayed moderate hydrophilicity compared to the high hydrophobic unmodified cellulose fabrics and moderate hydrophobicity compared to the highly hydrophilic chitin nanocrystals (ChNC) impregnated ones (Table 1)

Summary

Introduction

Membranes and filters are routinely used in water and wastewater treatment processes due to their reliable removal of contaminants without the addition of new chemicals and the production of harmful products in water treatment processes. The removal efficiency or selectivity of the membrane/filters is related to its microstructure, pore size, and surface chemistry. Microfiltration (MF) membranes and filters are extensively used in wastewater treatment as a key step in the primary disinfection of the uptake water stream. The use of MF membranes presents a physical means of separation (a barrier) as opposed to a chemical alternative. In this sense, both filtration and disinfection take place in a single step, negating the extra cost of chemical dosage and the corresponding equipment. MF membranes are used in secondary wastewater effluents to remove turbidity and to provide treatment for disinfection

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