Performance Of Triblock Copolymer Incorporated Silica Membranes: A Breakthrough Approach For Natural Wetland Saline Water Pervaporation
Auteurs : Elma Muthia . Aulia Rahma . Ghani Rhafiq Abdul . Bilad M Roil . Arifin Yulian Firmana .
Résumé
This work shows the preparation and water fluxes stabilisation assessment of triblock copolymer incorporated silica membrane for desalting natural wetland saline water via pervaporation. High quality triblock copolymer incorporated silica (Si-triblock copolymer) membranes delivered highest water fluxes of 4500 g.m-2.h-1 and salt rejection in excess of 99%. Water fluxes stabilisation performance confirmed that the Si-triblock copolymer membranes were hydrostable with no significant water flux and salt rejection. The hydrostability was attributed to carbonised templates embedded in the silica matrix through triblock copolymer as carbon precursor, which imparted hydrophobicity and strengthened the silica matrix under hydrolytic attack. The novelty of membrane preparation method was the calcination at intermediate temperatures of 250 to 450 C for 1 hour under atmospheric air. Rapid thermal processing (RTP) is a fast process technique for fabrication of inorganic membrane. Under these conditions, the combustion of templates is reduced, thus integrating carbonised template and silica into a single matrix membrane. The RTP proved to be a facile preparation method producing carbon silica membranes in a single day, contrary to conventional thermal process with production times up to ten days.
Mots clés
Natural wetland saline water ; desalination ; triblock copolymer incorporated silica membranes ; rapid thermal processing ; water fluxes stabilisation performance
