adsorption effect of Cu(II) is the best when Le modification ratio is 20%~50%; (2) The increase of pH and Рtemperature are favorable for Cu(II) adsorption by different Le-modified purple soils; the adsorption amount of РCu(II) by Le-modified purple soils has increased first and then decreased as the iconic strength enhanced, Рreaching the best value when the ionic strength is 0.1 mol·L-1; (3) The adsorption of Cu(II) by Le-modified purple Рsoils is a spontaneous, endothermic and entropic-increasing reaction; when pH=6, ionic strength is 0.1 mol·L-1 and Рthe temperature is 20 ℃, the adsorption amount of Cu(II) by Le-modified purple soils will reach the maximum. РKeywords: Erigeron Annuus; invasive plant; litter extracts; purple soils; Cu(II); adsorption amount
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