Removal of cadmium from aqueous solution by natural and thermally activated kaolinite

Removal of Cd(II) from aqueous solution and effect of activation temperature on the adsorption by kaolinite was investigated. Maximum activation temperature was determined as 600 degreesC for 1 hour and maximum adsorption capacities for natural kaolinite as 0.835 mg g(-1) at 5 degreesC and 1.117 mg g(-1) at 40 degreesC, for thermally activated kaolinite as 6.75 mg g(-1) at 25 degreesC and 7.518 mg g(-1) at 40 degreesC, respectively. Equilibrium contact time of cadmium was determined to be I hour. Adsorption of Cd(H) on kaolinite conforms to Langmuir's isotherm.