Preparation of Ce-doped La-based perovskite and its adsorption properties for phosphate and phytic acid in water
In order to effectively prevent phosphate and organophosphorus pollution in water,and fully tap the advantages of flexible structure control and strong affinity for phosphorus of lanthanum-based metal oxides,the Ce-doped La-Fe perovskite(LCFO)was successfully prepared by doping cerium at the lanthanum site on the basis of lanthanum-iron perovskite prepared by the citric acid sol-gel method.The thermodynamic and kinetic characteristics of adsorption of phosphate and phytic acid by LCFO were studied,and the effects of different chloride ions and humic acid ions on the adsorption process were investigated.SEM-EDS,XRD,FTIR,XPS and other characterizations were used to investigate the adsorption mechanism.The results showed that the adsorption capacity of LCFO for phosphate and phytic acid was 11.56 times and 1.74 times higher than that of original perovskite,and the adsorption capacity of LCFO was 57.86mg/g and 98.71mg/g,respectively.The phosphorus adsorption characteristics of both forms conformed to the pseudo-second-order kinetic equation and Langmuir isothermal adsorption equation,and humic acid ions weakened the adsorption of phosphate and phytic acid by LCFO,but the adsorption amount remained above 80%.The mechanism of phosphate and phytic acid adsorption by the material was mainly internal complexation as shown by the characterization analysis.This study provided a reference for further improving the adsorption capacity of lanthanum-iron perovskite on inorganic phosphorus and the removal of organic phosphorus.
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