GU Wenting, CHEN Guoke, WEI Yanfei

(Institute of Cultural Relics and Archaeology of Gansu, Lanzhou 730030, Gansu, China)

Abstract:A hydrothermal strategy was developed to prepare poly (acrylicacid)functionalizedmagnetite/reducedgraphene oxide nanocomposite (PAAG/Fe₃O₄). Because PAA-functionalized graphene is negatively charged, it can bind to positively charged dye molecules. The prepared materials have high degree of dispersion, high stability and high saturation magnetization when loaded with magnetic materials on functionalized graphene. The removal efficiencies of PAAG/Fe₃O₄ were 95.70% and 99.45% of Rhodamine B and Rhodamine 6G, respectively. The PAAG/Fe₃O₄ nanohybrid exhibited remarkable removal efficiency and intensity of magnetism, thus having excellent reusability. Therefore, such PAAG/Fe₃O₄nanocomposites can be used as an effective adsorbent to remove dye pollutants, with wide applications in cleaning and restoration of cultural relics.

Key words: polyacrylic acid; magnetic nanoparticles; pigment degradation