Study On The Preparation Of Biomass Carbon And Its Metal Complexes And The Adsorption Properties Of Uranium

Based on the current situation of severe energy crisis,it is urgent to seek for the efficient and environmentally friendly renewable energy,which is in line with the basic national policy of China's sustainable development.As an indispensable part of the nuclear power industry,uranium resources are also one of the potential resources in the ocean.The total reserves of uranium resources are abundant.Compared with the known land resources,uranium resources have obvious advantages in quantity.The uranium extracted from seawater as the raw material of the nuclear industry will be a revolutionary step for the nuclear power industry.However,radioactive waste water in nuclear industry contains a large amount of radioactive uranium,and a large number of heavy metals are extremely harmful to human health.Therefore,it is of great practical significance to seek a simple and effective method to make the uranium resources in the sea water captured and utilized by human beings,so that the uranium in the waste liquid of nuclear industry can be treated.Biomass carbon materials and their metal oxide composite materials have good adsorption effect and low cost,and have great potential in the field of seawater extraction of uranium and wastewater treatment of uranium.In this paper,the natural sunflower pollen?SFP?was treated as a substrate and the metal oxide/carbon material composites,MnO₂/SFP and TiO₂/SFP,were synthesized.At the same time on different experimental conditions of uranium adsorption behavior on the influence of adsorption material are studied and discussed,to achieve the optimal adsorption conditions,and the material in the uranium adsorption process involved in the dynamics,thermodynamics and adsorption isotherm were studied and determined category.Through the simple treatment,the green sunflower pollen adsorption material with low cost was obtained.The sunflower pollen was characterized by XRD,SEM,XPS and FT-IR tests.When the optimum pH value is 5,the maximum adsorption capacity of sunflower pollen material can reach 101.8 mg/g.The kinetic process of the adsorption of uranium in the solution of sunflower pollen is more in line with the pseudo-second-order kinetic model.The thermodynamic data show that the adsorption process of sunflower pollen to uranium is a endothermic and spontaneous process.The process of uranium adsorption by sunflower pollen conforms to the Freundlich model.Sunflower pollen was considered as precursor and carbon source,a hierarchical porous material MnO₂/SFP composite with good morphology was prepared by a simple and quick impregnation method and by oxidation-reduction reaction.The MnO₂/SFP-3 complex has good adsorption effect on uranium ion.When the optimum pH value is 5,the maximum adsorption capacity can reach 147.7 mg/g.The kinetic process of the adsorption of uranium by MnO₂/SFP-3 complex is more in line with the pseudo-second-order kinetic model,.Thermodynamic data show that the adsorption of uranium by MnO₂/SFP-3 complex is a endothermic and spontaneous process.The process of uranium adsorption by MnO₂/SFP-3complexes is more in line with the Freundlich model.The natural sunflower pollen was synthesized by sol-gel method with TiO₂ particles,and the TiO₂/SFP composite was obtained.When pH is 6,the maximum adsorption capacity can reach 215.7 mg/g.The kinetic process of the adsorption of uranium by TiO₂/SFP complex is more in line with the pseudo-second-order kinetic model.Thermodynamic data show that the adsorption of uranium by TiO₂/SFP complex is an endothermic and spontaneous process.The process of uranium adsorption by TiO₂/SFP complexes is more in line with the Langmuir model.