Chemical Research in Chinese Universities ›› 2025, Vol. 41 ›› Issue (5): 1208-1216.doi: 10.1007/s40242-025-5056-2

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

ZHANG Hongfa, HUANG Chang, YANG Siyuan, XU Zimeng, LI Yi, WU Qingyun, XUE Ming   

  1. School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, P. R. China
  • Received:2025-04-06 Accepted:2025-05-09 Online:2025-10-01 Published:2025-09-26
  • Contact: XUE Ming, E-mail: xueming5@mail.sysu.edu.cn;WU Qingyun, E-mail: wuqingy5@mail.sysu.edu.cn E-mail:xueming5@mail.sysu.edu.cn;wuqingy5@mail.sysu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Nos. 22071076, 22090061, 22408407), the Program of Department of Science and Technology of Guangdong Province, China (Nos. 2024A1515010429, 22022A1515010021), the Science and Technology Planning Project of Zhuhai, China (No. 2320004000169) and the Fundamental Research Funds for the Central Universities, China (No. 24xkjc007).

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 high-power 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 large-scale industrial production in dye separation applications.

Key words: Multicoated, Graphene oxide, UV light reduction, Dye removal, Long-term stability