Study on the Adsorption of Heavy Metal by Extracellular Polymeric Substances Extracted from Proteiniphilum acetatigenes PSB-W

Abstract

The negatively charged coordination groups on the structure of these biomolecules, which is the main components of extracellular polymeric substances (EPS), have good adsorption efficiency for heavy metals. In this paper, EPS form Proteiniphilum acetatigenes PSB-W which was extracted by EDTA method, and the effects of pH, EPS dosage, adsorption time and initial metal concentration on the adsorption regularity of Cu2+ and Pb2+ ions on EPS structure were studied respectively, as well as the adsorption efficacy of EPS on Cu2+ and Pb2+ heavy metals was also studied. The results showed that the adsorption of Cu2+ and Pb2+ by EPS was favorable when the pH value was 6. The adsorption equilibrium time of Cu2+ and Pb2+ by EPS was about 50 min. When EPS concentration was 96.6 mg/L, EPS had the best adsorption effect on Cu2+ and Pb2+. The adsorption efficiency of EPS to Pb2+ was higher than that of Cu2+. EPS extracted from Proteiniphilum acetatigenes PSB-W can be used in the treatment of heavy metal pollution, which has great significance in the removal of heavy metals from sewage.