This paper studies the characteristics and mechanism of the adsorption of methylence blue from aqueous solution by humic acid which was extracted from swampy soil in Zhongdian of Yunnan in two methods.The result shows that the adsorption could fit the langmuir model.Humic acids extracted in two methods has the similar pattern of adsorption,but the Humic acid by sodium pyrophosphate has better adsorption because of its bigger specific surface area.The adsorptive constant and thermodynamic parameters have been evaluated in different temperatures.Furthermore the mechanism of adsorption on the humic acid has been discussed.
