Design Of Phosphorus-containing Adsorbent And Study On Adsorption Properties For La(?)

In this paper,it was taken as the research object of La(?)in water to explore the influence of adsorption performance for phosphate modified adsorbent.In this experiment,two adsorption materials,IIP and LDH,were modified.A series of adsorption experiments were conducted to test the adsorption performance of the materials,and the adsorption mechanism of La(?)by phosphate modified adsorption materials was explored.The main research contents are as follows:1.La-IIP material with phosphate as identification site was successfully synthesized and optimized by using vinyl phosphonic acid as functional monomer.The adsorption experiments showed that the adsorption capacity of the material was 62.77 mg/g,and it had a good adsorption selectivity for La(?).Isothermal adsorption conforms to the Langmuir model,and the adsorption process conforms to the pseudosecondary kinetic model.The adsorption equilibrium can be reached within 30 min,and the optimal adsorption pH is 4.0.Compared with La(?)imprinted materials in the literature,it is found that this material has better elution efficiency,acid stability,better recycling and regeneration performance.Through FT-IR and XPS analysis,it is shown that the La-IIP materials is related to P-O and P=O,and the adsorption mechanismt of La(?)is P =O transform into P-O-La.2.Phosphate modified LDH materials were synthesized by ion exchange,calcining and recovery and co-precipitation.XRD,BET and SEM characterization and adsorption experiments were used to compare the properties of the materials synthesized by the three methods.Isothermal adsorption showed that the adsorption capacity of LDH material to La(?)was increased by phosphoric acid modification.The adsorption conforms to the Langmuir model,and the theoretical maximum adsorption capacity is 335.64 mg /g,higher than that of most La(?)adsorption materials.The adsorption was more in line with the quasi-second order kinetic model,and the adsorption equilibrium time was longer.The optimal adsorption pH was 6.0,and the material was unstable when the pH was less than 3.0.Selective experiments show that the modification of phosphoric acid at high concentration improves the selectivity of materials...