Phosphogypsum Loaded CoFe Prussian Blue for the Application of Cesium Adsorption
CoHCF@PG was synthesized by coprecipitation to grow Prussian blue analogue(CoHCF)on phosphogypsum(PG),PG was used as the adsorbent carrier and CoHCF as the adsorbent material.The structural integrity of CoHCF@PG was verified by SEM,XRD,FTIR and other analysis methods.The adsorption properties of CoHCF@PG on Cs+under the influence of solid-liquid ratio,pH value,contact time and initial concentration of Cs+were studied by static tests.The results showed that the optimal solid-liquid ratio of CoHCF@PG was 0.5,and the saturated adsorption capacity reached 135.15 mg/g by contacting Cs+solution at concentration of 100 mg/L and pH=7 for 120 min.The adsorption process was in accordance with the pseudo-2nd kinetic model and Langmuir isothermal adsorption model.The results indicate that Cs+adsorption by CoHCF@PG is a single molecular layer chemisorption process,and the adsorption rate is dominated by the exchange rate of K+and Cs+ions in CoHCF.The thermodynamic model indicates that the adsorption process is a spontaneous endothermic reaction with increased entropy.
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