Abstract
Lawny grass loaded Cyanex272 prepared by solid-liquid grind was used to remove Pb(II) in the batch and column process. Carboxylic groups were introduced to the grass by citric acid modification and Cyanex272 was successfully immobilized on grass. The removal rate of Pb(II) on 272-1CG is close to 100%. Cyanex272 also played an important role in improving maximum adsorption capacities from 328 to 380 mg/g and shortening equilibrium time from 60 min to 40 min. Thermodynamic results indicate the adsorption of Pb(II) is spontaneous and endothermic. 0.1 mol/L HCl is used as eluent and desorption percentages reach 95.1%.
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