Multicoated GO Nanocomposite Membranes with Long-term Stability in Aqueous Environment for Dye Removal

Abstract

Graphene oxide (GO)-based membranes have garnered significant attention in water purification and dye separation due to their electrostatic interactions arising from abundant functional groups and exceptional molecular sieving capabilities. However, challenges such as the inability to produce uniform GO membranes at an industrial scale and poor stability in an aqueous environment hinder their widespread application in industry. In this work, a scalable and easily adjustable technique is proposed to GO membrane with long-term stability in an aqueous environment by multilayer integration rod-coating with highpower UV reduction. A piece of multilayer graphene oxide membrane (MGM) with a size of 30 cm×30 cm with uniformity and efficiency can be easily formed. MGM demonstrates remarkable performance in dye separation, achieving a stable flux of 10.76 LMH·bar⁻¹ [LMH: L/(m²·h); 1 bar=10⁵ Pa] over more than 300 h of testing, along with a dye separation efficiency exceeding 95.0%. Moreover, the separation performance as well as the pore parameter can be flexibly modulated by changing the rod-coating times to adapt to the dye molecules under different conditions. The excellent performance of MGM paves the way for their largescale industrial production in dye separation applications.

Keywords

Multicoated / Graphene oxide / UV light reduction / Dye removal / Long-term stability

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RIGHTS & PERMISSIONS

Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH