Nanoparticales Using Two Plantleaf Study On The Removal Of U(?) Respectively

Nowadays,the preparation technology of nano-iron has developed rapidly and has various preparation methods.Because the nano-iron particles have the advantages of high reactivity,large specific surface area,small particle size,and strong reduction,it is a reducing material that can attract people's attention and has application prospects.In particular,green synthetic nano iron has excellent characteristics such as low cost,no use of harmful substances,no secondary pollution,low energy consumption,and simple operation.Therefore,it is necessary to deeply analyze the components that work,investigate its reaction mechanism,optimize the morphology and structure of nanoparticles,and increase the yield.This is the research direction of the application of green synthetic nano iron to heavy metal pollution.In this paper,nano-iron(EL-Fe NPs,HL-Fe NPs)were prepared by using extracts of red-leafed laurel leaves and lotus leaf,respectively,and used to remove uranium in water.SEM,XRD,EDS,FTIR,TG techniques were used to characterize and analyze the microstructure of green synthesized nano-iron before and after U(?)reaction.The morphology before and after the reaction was observed,and EL-Fe NPs,HL-Fe NPs were explored.Fe NPs remove the mechanism of U(?).The effects of EL-Fe NPs and HL-Fe NPs on the removal of U(?)were investigated by comparing the dosages of EL-Fe NPs and HL-Fe NPs,p H value,initial concentration of U(?)solution,reaction temperature and reaction time.The experimental results show the following:(1)The green synthesized ET-Fe NPs and HL-Fe NPs are all spherical and uniformly distributed,with particle sizes of 25-45 nm and 65-85 nm,respectively.The green synthesized nanoparticles are mainly Fe2O3,Fe3O4,Fe OOH,and Fe0.There are organic groups such as O—H,C—H,C=C,and C—N,which are surrounded by the surface of the particles.(2)Initial U(?)concentration of 10 mg/L,temperature of 30 ?,rection time of 100 min,p H of 6,dosing ratio of EL-Fe NPs or HL-Fe NPs and U(?)of 5g/L.At this conition,the removal of U(?)using EL-Fe NPs,HL-Fe NPs were 89.64% and 71.59%,respectively.(3)The main mechanism of removing U(?)from EL-Fe NPs and HL-Fe NPs respectively is reduction,adsorption,and complexation,and they occur on the surface of nano-iron particles,and the organic groups and chemical bonds such as CN group and Fe-O bond are enclosed.The removal of U(?)was promoted,which showed that both the ET-Fe NPs and the HT-Fe NPs remove uranium.Both the adsorption reaction and the reduction reaction occurred.This process is a complicated physical and chemical process.