Green Nanometer Iron Carbon Nanotubes Composite Materials To Remove Heavy Metal Water U(?)?Pb(?)performance Research

Plant reduction preparation of green nano-iron has the advantages of low cost,green environmental protection,high material utilization rate,simple preparation process,easy to compound with other materials with excellent properties,etc.In this paper,the carbon nanotube green nano-iron composite was prepared by reducing sunflower extract.Carbon nanotubes green iron nanocomposites(S-Fe/CNT)were prepared for the removal of uranium and lead from water,and the removal mechanism was analyzed.The experimental results showed that:Carbon nanotubes green iron nanocomposites S-Fe/CNT were synthesized from three raw materials,namely sunflower extract,ferrous sulfate heptahydrate and carbon nanotubes,to remove uranium and lead from water.Basis S-Fe/CNT dosing quantity,pH value,U(?)? Pb(?)initial concentration,reaction temperature,reaction time and so on five groups of parameters testing S-Fe/CNT removal of uranium and the effect of lead,XRD,SEM,EDS and FTIR technology S-Fe/CNT characterizing the microstructure analysis of the experimental results show that:(1)After the acid treatment of the surface of the carbon nanotube(CNT)contains rich oxygen containing functional groups,dispersivity is good,in aqueous solution is helpful to the stability of the composites and evenly dispersed,S-Fe/CNT,material form spherical and elliptic ball,theaverage particle size are between 20 and 60 nanometres,main elements C?O?Fe?dispersivity is good,large specific surface area;The morphology of FeNPs material is basically in the shape of crushed stone,with local slight agglomeration,and the average particle size is between 15 and 40 nm.Carbon nanotubes have dense network structure,uniform dispersion,large aspect ratio and specific surface area.(2)Review S-Fe/CNT dosing amount,reaction temperature,reaction time,initial concentration,PH value U(?)? Pb(?)solution on the S-Fe/CNT to remove the influence of U(?)? Pb(?),select the best parameters: the S-Fe/CNT dosing quantity 5g/L,40?,reaction temperature,reaction time was 90 min,U(?)the initial concentration of 10 mg/L,PH= 5,S-Fe/CNT)on the removal rate of U(?)removal rate reached 97.4%?the S-Fe/CNT dosing quantity 5g/L,30 ?,reaction temperature,reaction time was 90 min,Pb(?)the initial concentration of 10 mg/L,pH = 6,S-Fe/CNT on the removal rate of Pb(?)removal rate reached 78.6%.(3)The abundant oxygen-containing functional groups such as-OH and C=O in the CNT surface and sunflower extract are conducive to the dispersion of carbon nanotubes in aqueous solution,and the riveting between iron nanotubes and carbon nanotubes is conducive to the dispersion and stability of composite materials.The processes of uranium and lead removal are mainly reduction and adsorption,the C=O in the carbon nanotube and sunflower extract plays an adsorption role,and the fe-o bond in the nano-iron plays a reduction role.