Antibacterial properties of membranes modified by acrylic acid with silver nanoparticles

Abstract

Organic fouling is a very important problem in case of membrane filtration processes. Partially, impact of fouling might be overcome by: back puls, membrane cleaning, cross-flow filtration, or surface modification. In this paper, first, surface modification of membrane by acrylic acid and then silver nanoparticles will be presented. In the first step of modification, acrylic acid is grafted to the surface of the polypropylene capillary membrane, thanks to Fenton-type reaction. Then, membranes are further modified by the synthesis of silver nanoparticles directly on the membrane surface. It is well known that silver nanoparticles exhibit antibacterial properties for micro-organisms such as Escherichia coli and Bacillus subtilis. Also the presence of acrylic acid on the surface of the membrane should reduce adhesion of particles to the membrane surface. In the present work, results obtained for acrylic acid grafting will be presented including FT-IR analysis and the amount of grafted carboxylic groups. Results for membranes further modified by silver nanoparticles, as well as tests for antibacterial properties of such membranes, will be presented. Antibacterial properties of modified membranes were tested on two model gram positive and gram negative bacteria: E. coli and B. subtilis. Tests were performed in liquid and solid Lysogeny Broth. The presented membranes exhibit very good antibacterial/bacteriostatic properties.

Substrate-Independent, Regenerable Anti-Biofouling Coating for Polymeric Membranes

“…However, all these methods are limited to specific membrane materials with functional groups on their surfaces and cannot be applied to other membrane materials. Other studies reported the immobilization of AuNPs with the aid of polyacrylic acid, which was grafted on the membrane surface using gamma-rays [ 28 ], the physisorbed free radical grafting technique [ 29 ], or the Fenton type reaction [ 30 ]. However, the requirements of an inert atmosphere or the introduction of other additional copolymers limits these applications.…”

Preparation of poly[3-(methacryloylamino) propyl] trimethylammonium chloride coated mesh for oil–water separation

“…The oil-water separation membranes inspired by fish scales have been widely adopted to solve the problem [15][16][17][18] due to its anti-oil properties and underwater superoleophobicity. Nevertheless, the complication of multiplying bacteria on membranes was gradually revealed in recent years [19][20][21][22][23].…”

Green Synthesis of Metallic and Carbon Nanostructures

“…A recent study shows a simpler unsaturated carboxylic acid (acrylic acid) that works with silver nanoparticles in the process of membrane filtration that avoids nanoparticles to adhere to the surface of the modified membranes, which at the same time show antibacterial/bacteriostatic properties [109]. The main reaction of acrylic acid is polymerization; thus, it is commonly used in the production of plastics, paints, and adhesives.…”