Effective of Xanthate Modified Chitosan on the Adsorption of Lead Ions

Abstract

Water lead pollution has a serious threaten to safety of food and ecological. How purify lead polluted wastewater efficiently become an important environmental topic. This study aimed to investigate the effect of the xanthate modified chitosan (XCS) on the adsorption properties of toxic lead from simulated wastewater via static adsorption method. Results showed that the adsorption of lead of both chitosan and XCS depend on solution pH obviously and the optimal pH of 5. The adsorption characteristics of the two adsorbents for lead ions accord with the pseudo-second order kinetics. But the xanthate modify can improve the rate of lead adsorption effectively. Adsorption of lead ions on chitosan follow the Langmuir model, and that of XCS conform to the Freundlich model. However, the effect of temperature on the adsorption capacity was none difference. The lead maximum adsorption capacity of original chitosan and XCS at 40°C was 194.36 mg/g and 317.82 mg/g respectively. The results showed that xanthate modify can improve the adsorption of lead on chitosan and XCS would has great potential for practical application.