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Facile synthesis of recycling Fe3O4/graphene adsorbents with potassium humate for Cr(VI) removal

Wang, Xiaopeng, Lu, Jing, Cao, Baoyong, Liu, Xueming, Lin, Zhang, Yang, Chao, Wu, Ronglan, Su, Xintai, Wang, Xuefeng
Colloids and surfaces 2019 v.560 pp. 384-392
adsorbents, adsorption, chromium, colloids, equations, graphene, metal ions, models, moieties, nanocomposites, potassium, recycling, sorption isotherms, wastewater
Potassium humate possesses a wide variety of oxygen-containing functional groups and has good adsorption and complexation properties for many kinds of transition metal ions. In this work, a simple and separable route had been developed to synthesize Fe3O4/graphene nanocomposite, derived from potassium humate, were employed for the effective adsorption of Cr(VI) in aqueous phase. In addition, the Fe3O4/graphene nanocomposite prepared at 600 °C (S-600) showed a maximum adsorption capacity of 280.6 mg/g for Cr(VI) and good cycling performance, which was much higher than those reported graphene-based adsorbents and other conventional adsorbents. The adsorptive behavior was well fitted to the Langmuir isotherm model. The adsorption kinetics for removal of Cr(VI) agreed with pseudo-second-order equation, which indicates a kind of chemical adsorption. Its superior adsorption performance might be due to the effective adsorption sites at the surface and formation of FeOH2+ on the surface of Fe3O4/graphene. This work provided a promising approach for the removal of Cr(VI) from wastewater using a Fe3O4/graphene nanocomposite, which shows a huge number of application prospects.