【摘要】 将酿酒酵母菌制成的生物吸附剂用于重金属污染海水中Pb2+的生物吸附,研究了pH值、吸附剂用量、吸附温度、Pb2+初始浓度、吸附时间等因素对生物吸附效果的影响。结果表明,酿酒酵母对海水中Pb2+具有较好的吸附效果,最佳吸附条件为:pH值6、吸附剂用量1.0g·L-1、吸附温度40℃、Pb2+初始浓度50mg·L-1、吸附时间120min,吸附率达94.57%。吸附过程能较好拟合Langmuir方程,理论最大吸附量为60.98mg·g-1。动力学分析表明,酿酒酵母对海水中Pb2+吸附120min达到平衡,吸附过程可用准二级反应动力学模型拟合,相关系数为0.9991。原子力显微镜照片显示,Pb2+被吸附到酿酒酵母表面,与细胞壁上的物质结合生成沉淀物附着在细胞壁上。更多还原

【Abstract】 Using Saccharomyces cerevisiae as biosorbent,the adsorption of Pb2+in seawater was studied.The effects of pH value,adsorbent dosage,adsorption temperature,initial concentration of Pb2+and adsorption time on biosorption efficiency were studied.Results showed that Saccharomyces cerevisiae had good adsorption effect of Pb2+in seawater.Under the optimum conditions as follows:pH value 6,adsorbent dosage 1.0g·L-1,adsorption temperature 40℃,initial concentration of Pb2+50mg·L-1,adsorption time 120 min,the adsorption rate reached 94.57%.The adsorption process was consistent with the Langmuir equation,by which the maximum adsorption capacity of Saccharomyces cerevisiae proved to be 60.98mg·g-1.Kinetic studies revealed that the biosorption was rapid,the adsorption of Pb2+in seawater reached equilibrium within 120 min.The adsorption process could be accurately described by pseudo-second-order kinetic regression model and the correlation coefficient was 0.9991.Atomic force microscope images showed that Pb2+was adsorbed to the surface of Saccharomyces cerevisiae by precipitation with the materials on cell wall.更多还原