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| Pb2+ adsorption features of extracellular polymeric substance producted by a Brevibacillus agri strain |
| HONG Chen1,2, LI Yi-fei1, SI Yan-xiao3, XING Yi1,4, WANG Zhi-qiang1, ZHANG Ying-ying1 |
1. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Research Center for Eco-Environmental Sciences, Chinese Academy Science, Beijing 100085, China;
3. School of Environment, Tsinghua University, Beijing 100084, China;
4. Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract Extracellular polymeric substances (EPS) were categorized based on the compactness: soluble EPS (S-EPS), loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS). The EPS used for experiment was extracted from Brevibacillus agri strain and the adsorption characteristics of Pb2+ onto S-EPS, LB-EPS and TB-EPS were investigated at different temperature and pH. Meanwhile, adsorption kinetics model and adsorption isotherm model were also be established and the change of surface morphology of EPS before and after adsorption were observed by scanning electron microscope (SEM). When temperature was 35℃ and pH was 5.5, the Pb2+ adsorption capacity of S-EPS, LB-EPS, TB-EPS was 91.35, 100.61, and 90.28mg/g, respectively. The results showed that the Pb2+ adsorbability of LB-EPS was better than those of S-EPS and TB-EPS. Additionally, adsorption kinetics and adsorption isotherm of EPS for Pb2+ fitted Pseudo second order kinetic model and Langmuir adsorption isotherm model. The results indicated that adsorption process was controlled by chemisorption mechanism and monolayer adsorption, respectively. The largest adsorption capacities calculated by Langmuir adsorption isotherm model of S-EPS, LB-EPS, TB-EPS were 124.224, 127.389 and 119.760mg/g, respectively. Furthermore, SEM analysis confirmed that surface morphology of S-EPS, LB-EPS, and TB-EPS changed significantly before and after adsorption. In which, LB-EPS had the largest adsorption capacity as its pulmonary alveoli structure and large specific surface area.
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Received: 10 October 2016
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