Adsorption Studies of La(Ⅲ)in Waste water by Different Kinds of Humic Acids
In order to study the adsorption variability of lanthanide ions by different kinds of humic acids,different kinds of humic acids were extracted by sodium pyrophosphate and sodium hydroxide methods,and their elemental compositions and functional groups were preliminarily characterised;the influences of temperature,pH,initial concentration,and time on the adsorption of La(Ⅲ)were investigated,and quasi-primary and quasi-secondary adsorption kinetics were also applied to fit the data,and the adsorption kinetics of the adsorption process were determined by Langmuir and Freundlich equations to fit the isothermal adsorption process.The results showed that the humification degree and the aromaticity of different humic acids were different,the adsorption of La(Ⅲ)by different humic acids increased under acidic condition,while decreased under alkaline condition,except for xanthic acid,and the adsorption capacity decreased with the increase of the temperature,and the adsorption kinetics of La(Ⅲ)by different humic acids was more in line with quasi second-order kinetic adsorption equations,and the isothermal adsorption curves were in line with the Freundlich model.Freundlich model.
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