CAJ | 학술논문

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1.0 g·L－1、吸附温度40℃、Pb2＋初始浓度50 mg·L－1、吸附时间120 min，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60.98 mg·g－1。动力学分析表明，酿酒酵母对海水中 Pb2＋吸附120 min 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。
장양주효모균제성적생물흡부제용우중금속오염해수중 Pb2＋적생물흡부，연구료 pH 치、흡부제용량、흡부온도、Pb2＋초시농도、흡부시간등인소대생물흡부효과적영향。결과표명，양주효모대해수중 Pb2＋구유교호적흡부효과，최가흡부조건위：pH 치6、흡부제용량1.0 g·L－1、흡부온도40℃、Pb2＋초시농도50 mg·L－1、흡부시간120 min，흡부솔체94．57％。흡부과정능교호의합 Langmuir 방정，이론최대흡부량위60.98 mg·g－1。동역학분석표명，양주효모대해수중 Pb2＋흡부120 min 체도평형，흡부과정가용준이급반응동역학모형의합，상관계수위0.9991。원자력현미경조편현시，Pb2＋피흡부도양주효모표면，여세포벽상적물질결합생성침정물부착재세포벽상。
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 1.0 g·L-1 , adsorption temperature 40 ℃,initial concentration of Pb2+ 50 mg·L-1 ,adsorption time 120 min,the adsorption rate reached 94.57%.The adsorption process was consistent with the Langmuir equation,by which the maxi-mum adsorption capacity of Saccharomyces cerevisiae proved to be 60.98 mg·g-1 .Kinetic studies revealed that the biosorption was rapid,the adsorption of Pb2+ in seawater reached equilibrium within 120 min.The adsorp-tion 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 Sac-charomyces cerevisiae by precipitation with the materials on cell wall.