• 关键词：耐盐酵母  鲁氏酵母  Cu²⁺  生物吸附  等温吸附线

• 基金项目：教育部博士点基金新教师项目(No.200804231032);“十一五”国家科技支撑计划重大项目(No.2008BAD94B09);国家自然科学基金项目(No.30972289)

• 徐莹
• 中国海洋大学食品科学与工程学院, 青岛 266003

• 刘文磊
• 中国海洋大学食品科学与工程学院, 青岛 266003

• 姜凯元
• 中国海洋大学食品科学与工程学院, 青岛 266003

• 姜维
• 中国海洋大学食品科学与工程学院, 青岛 266003

• 汪东风
• 中国海洋大学食品科学与工程学院, 青岛 266003

• 摘要：为了研究耐盐鲁氏酵母(Zygosaccharom ycesrouxii)CICC 1379 细胞冻干粉对重金属Cu²⁺的吸附作用及机理,对影响该酵母脱除水中Cu²⁺的主要因素(温度、初始pH和吸附时间等)进行了探讨,并对Cu²⁺的吸附动力学和吸附模型进行了研究.结果表明,温度(25～40℃)对耐盐鲁氏酵母粉吸附Cu²⁺的影响不大;初始pH(2～7)对Cu²⁺脱除率影响较大,最适pH值在4～6之间,而pH=2时的吸附效果较差.经耐盐鲁氏酵母处理后,溶液pH发生了变化,基本维持在4.00～6.99之间,且均趋向于相同质量氯化铜溶于水后的自然pH值(5.2).耐盐鲁氏酵母粉在5min内对Cu²⁺的吸附量可达到其最大吸附量的89.2%,30min可达到吸附平衡,其吸附动力学适合采用准二级动力学方程描述.与Langmuir方程相比,耐盐鲁氏酵母对Cu²⁺的吸附过程更适合采用Freundlich方程描述.

• Abstract：We studied the biosorption process and mechanism of Cu²⁺ from aqueous solution onto lyophilized biomass of salt-tolerant Zygosaccharomyces rouxii CICC 1379. The effects of temperature,initial pHand contact time on the rate of removal of Cu²⁺ from aqueous solution were measured in a batch system. The biosorption kinetics and isotherm models were also studied. The results showed that temperature (25～40℃) had an insignificant effect on Cu²⁺ biosorption onto the biomass,while initial pHaffected the Cu²⁺ removal rate significantly. The optimum initial pHfor the biosorption was 4～6 and decreased as the pH dropped to 2. During the treatment process,the pHof the solution changed from an initial pHrange of 4.00 to 6.99 to the natural pH of CuCl₂ with the same concentration. The 89.2% of its maximum Cu²⁺ biosorption capability was achieved during the first 5 min and the Cu²⁺ biosorption equilibrium was attained within 30min. The kinetics data fit well with the pseudo-second-order equation. The Freundlich isotherm model described the experimental data of the biosorption of Cu²⁺ onto Z. rouxii CICC 1379 biomass perfectly,followed by the Langmuir isotherm model.

• Key words：salt-tolerant yeast  Zygosaccharomyces rouxii  Cu²⁺  biosorption  adsorption isotherm

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