RETRACTED: Preparation of Fe3O4 Nanoparticles by Use of Catalytically Oxidized Liquids of Cyanide Tailings by NOx and Research of Its Adsorption Properties (Retracted Article)

Ferric ion in catalytically oxidized liquids of cyanide tailings by NOx was separated by solvent extraction technology or precipitation method, then the separated ferric ion was reduced partially by iron. At last, two different kinds of Fe3O4 nanoparticles were prepared from the two kind of different ferric liquid. The particle size and magnetic properties of Fe3O4 were studied. It is concluded that Fe3O4 nanoparticles made from precipitation method is one kind of super-paramagnetic particle, with an approximately diameter of 20nm, saturate magnetization of 58.72 emu/g and surface area of 235m(2)/g, compared with those particles from the other separation method. The adsorption performance was studied by degeneration methyl orange (MO). Results show that the adsorption property of highly concentrated MO is better. The adsorption rate can achieve above 90% under 200 times of dosage, low temperature and the acidic condition. The adsorption process is the spontaneous exothermic reaction. Relationship between balanced adsorptive capacity q and the balance mass density C-e is well conformed with the Langmuir adsorption isotherms, which belongs to the monolayer adsorption. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of the Organizers of 2011 International Conference on Energy and Environmental Science.