Synthesis Of Manthesis Fe₃O₄ And Incorporation Uranium From U-containning Wastewater By Electrochemical Merhod

Traditional uranium mineralization methods were restricted by pH value of the wastewater?only suitable for alkaline conditions?,meanwhile,has disadvantages on cost-consuming,long treatment time and low-producing.Thus,the key to the efficient treatment of uranium-containing wastewater is to develop the uranium mineralization technology with low pollution and simple process.In view of this,we report an electrochemical method for the simultaneous synthesis of Fe₃O₄ and immobilization of uranium from uranium-bearing wastewater.High purity iron and graphite were used as the anode and cathode materials,respectively.In this process,the anode iron was dissolved slowly and crystallized to form magnetic Fe₃O₄ by adjusting the electrochemical parameters and water quality parameters.Meanwhile,uranium was incorporated into the lattice of magnetic Fe₃O₄.The effect of process parameters including voltage,current intensity,reaction time,cathode materials on Fe₃O₄ synthesis were studied to obtain the stable formation mechanism of Fe₃O₄.Moreover,the microscopic bonding environment of uranium in the magnetic Fe₃O₄ lattice was revealed by analyzing the changes of element composition,phase composition,microstructure and crystal parameters.The main conclusions are as follows:Fe₃O₄ with high magnetic strength,single phase,high crystallinity,uniform size?about 20-70 nm?were synthesized after 40 min under the condition of weak acid and obtained the remarkable uranium removal efficiency.The main factors affecting the crystallization of magnetic Fe₃O₄were concentration ratio of iron ions and redox potential.Magnetic Fe₃O₄incorporated uranium in the magnetic Fe₃O₄ lattice through U-Fe and U-O bonds instead of simple surface deposition or adsorption,and the doping of uranium does not change the spinel structure of Fe₃O₄,maintaining the stability of magnetite ore structure.