Acid-modified bentonite was used for the adsorption of low concentration [BMIM]Cl ionic liquid solution.The effect of adsorption temperature;adsorption time and pH value of ionic liquid solution on the adsorption properties was investigated.Experimental results showed that acid-modified bentonite had good adsorption properties for the cation of [BMIM]Cl ionic liquid.In the neutral solution;acid-modified bentonite had the maximum adsorption capacity for [BMIM]Cl.The adsorption process of [BMIM]Cl by acid-modified bentonite was exothermic and belonged to the Langmuir isothermal adsorption.At the same time;the Langmuir isothermal adsorption equation was obtained and the correlation coefficient was larger than 0.99.