Research on Adsorption of Cr(VI) in Water by Potassium Chloride Modified Peanut Shell Carbon

In order to remove Cr (VI) in water effectively, peanut shell carbon was modified by potassium chloride. The results showed that the removal rate of modified peanut shell carbon was 50.3%, increasing by 17.73% compared with peanut shell carbon. The removal and adsorption effects of modified shell carbon on Cr (VI) under different adsorption conditions were investigated and which including pH, adsorbent dosage, adsorption time and the ion concentration. The results showed that the best adsorption removal efficient of Cr (VI) in water can be obtained with pH of 4, adsorption dosage of 0.3g, the adsorption time of 150 min, and the Cr (VI) concentration of 8μg/ml. The removal rate of modified peanut shell carbon reached 99.86% under the condition. The adsorption process fitted the Freundlich adsorption isotherm and conformed to the quasi-second order kinetic equation.