Study On Adsorption Of Antimony(Ⅲ)From Aqueous Solution Using Graphene Oxide And It’s Magnetite Composites

China is the world’s largest reserves and production of antimony country, and annual output more than about 85% of the world total output. In the southwest of Hunan Province, Xikuangshan has the world’s largest antimony deposit, and is well known as the "world of antimony". The the water, atmosphere, soil and vegetation around of the antimony mining were affected by the contamination of antimony. Recently studies found that: antimony in water by the mining area is about 7000 μg/L, which is more higher than the concentration prescribed for drinking water in our country’s limits（5 μg/L）; antimony in soil in this area is about 100.6-5045 μg/g has also exceeded the limit concentration of antimony in soils of china. Antimony in the ecosystem through the food chain cycle can be enrichment several times, and then can be absorbed by the human body, and do great harm for the human health.At present, there are a lot of methods for remove antimony from the aqueous solution. Adsorption, due to its advantages of simple equipment, easy operation, wide application range, excellent treatment effect and can be reused after regeneration, is widely used in wastewater treatment. There are many kind of adsorbents, in recent years, graphene oxide due to its large specific surface area has been widely studied as the adsorption material to remove pollutants in the water.This paper on the bases of the present research results, prepared graphene oxide by the improved Hummers method, and combined Fe₃O₄/GO which can be easily separated from the solutions, further more in order to increase the volume of water treatment and promote the practical engineering use, QFGO is prepared by loading GO and Fe₃O₄ to the surface of quartz sand filter. These three kinds of materials were characterized by SEM, XRD, FTIR performance and functional groups, respectively. And the effect of p H, adsorbent dosage, initial concentration on the adsorption effect have been investigated, the adsorption mechanism is discussed using the adsorption kinetics and adsorption thermodynamics; and dynamic adsorption column experiment of QFGO have been tested for their ability to remove Sb（Ⅲ） from aqueous solution by batch static adsorption and dynamic column adsorption, and the mechanism of the adsorption process by the three materials were determined.Through the characterization of SEM, XRD, FTIR, it can be found that the three material of GO, Fe₃O₄/GO and QFGO have been prepared more successfully.Batch static adsorption using GO GO, Fe₃O₄/GO and QFGO to adsorb Sb（Ⅲ） results showed that with the increase of the dosage, the removal efficiency of Sb（Ⅲ） was increased, this indicated the adsorption process is a fast one. The removal efficiency of Sb（Ⅲ） is changed very little at the p H range of 3.0 to 9.0 Kinetic data were best fitted with the pseudo-first-order kinetic model and intraparticle diffusion model well. The batch equilibrium data fitted well to the Langmuir and Timkin than to Freundlich isotherms. The maximum adsorption capacity of the three adsorbents for Sb（Ⅲ） were 34.42 mg/g, 8.7 mg/g and 2.1 mg/g respectively. Among these, GO was larger than some adsorbents as reported. The thermodynamic study showed that the adsorption process is a spontaneous endothermic process. Regeneration study found EDTA is well for regenerating Sb（Ⅲ） from the three adsorbents than other materials.Continuous fixed-bed column studies showed that with the increase of flow rate, influent concentration and with the decrease of bed depth, the exhaustion time decreased and the exhaustion speed increased, which is consistent with the static adsorption experiment. The Thomas and Yoon-Nelson models were both good applied to the adsorption of Sb（Ⅲ）. The predicted breakthrough curves and evaluated the model parameters of the fixed·bed column are useful for process design.These results showed that graphene oxide, Fe₃O₄/GO and QFGO could be considered as a potential and effective adsorbent for the removal of Sb（Ⅲ） ions from aqueous solution.