writer：Kun Luo, Yuanying Mu, Peng Wang, Xiaoteng Liu
keywords：nanocomposite, magnetite, graphene, oxidation degree, adsorption
source：期刊
specific source：Applied Surface Science
Issue time：2015年
bysolvothermal method, which can be easily collected after removal of pollutants without secondary pol-lution of graphene powders. Raman and FT-IR analyses show that the reduction of the mixing vaporof ammonia and hydrazine at different reaction periods generates the discrepancy of oxidation degreefor reduced graphene oxide (rGO), which can be kept after the solvothermal synthesis of Fe3O4/rGOnanocomposites. Batch adsorption experiments indicate that the nanocomposite with maximum oxi-dation degree of rGO presents the largest magnetization of 35.4 emu g?1and adsorption capacity of59.2 mg g?1for Cu2+, while the one with minimum oxidation degree exhibits the strongest adsorption of39.0 mg g?1for methylene blue accompanied with appropriate magnetization of 9.0 emu g?1, and only23% of initial capacity was lost after seven recycling use. The adsorption kinetics of the both compositesfollows the pseudo-second-order model, suggestive of physical and chemical interactions between thepollutants and adsorbent. The results suggest that the oxidation degree of the rGO substrate can appar-ently influence both the structure and the adsorbing behavior of Fe3O4/rGO nanocomposites, whichallows the control over the adsorbent performance according to the pollutant of interest.