Study on defluorination adsorption performance of double modified activated alumina
In order to further improve the adsorption performance of activated alumina,two kinds of adsor-bents,nitrate acidified activated alumina loaded lanthanum(LHAA)and loaded magnesium(MHAA),were prepared with the combination of nitrate acidification and chemical impregnation.The adsorption per-formance of LHAA and MHAA was studied,and the mechanism of fluoride removal was explored.The re-sults showed that the optimal removal rate of 20 mg/L fluoride water were 93％and 90％respectively,and the maximum adsorption capacities were 17.64 mg/g and 10.96 mg/g,respectively,when the adsorp-tion time was 2 h,the dosage was 2 g/L,pH=6,and the oscillation frequency was 180 r/min.The adsorp-tion isotherms of fluoride ions by both of them conformed to the Langmuir isotherm model,and the adsorp-tion kinetics fitting conformed to the pseudo second order kinetics.
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