Lanthanium-modified montmorillonite (Ca-MMT@La) was prepared by loading La3+ into Ca-montmorillonite (Ca-MMT).The specific surface area,structure and chemical composition of Ca-MMT@La was characterized by BET,XRD,FT-IR and XRF.The effects of adsorption time,initial phosphate concentration,pH value of phosphorus-containing solution and temperature on the adsorption performance were investigated.The results showed that the removal efficiency of phosphate by Ca-montmorillonite was significantly improved after lanthanum modification.When the adsorption time was 7h,the adsorption process of Ca-MMT@La reached equilibrium,and the maximum removal efficiency reached 87.82%.With the concentration of phosphate increasing,the removal efficiency reduced.With the increase of pH value of phosphorus-containing solution,the removal efficiency increased firstly and then decreased,and the maximum removal efficiency was 95.96% at pH=3.According to Langmuir isothermal adsorption equation,the adsorption model displayed monomolecular adsorption layer.
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