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| 固定化啤酒酵母菌对锶的吸附机制及热力学研究 | |
| 引用本文： | 杨玉山,董发勤,张伟,聂小琴.固定化啤酒酵母菌对锶的吸附机制及热力学研究[J].环境污染与防治,2012,34(1):5-8. |
| 作者姓名： | 杨玉山 董发勤 张伟 聂小琴 |
| 作者单位： | 1. 西南科技大学国防科技学院,核废物与环境安全国防重点学科实验室,四川 绵阳621010 2. 西南科技大学党委办公室,教育部固体废弃物处理与资源化重点实验室,四川 绵阳621010 3. 西南科技大学分析测试中心,四川 绵阳,621010 |
| 基金项目： | 国家自然科学基金，核废物与环境安全国防重点学科实验室基金 |
| 摘 要： | 以聚乙烯醇和海藻酸钠作为载体,制备了固定化啤酒酵母菌颗粒。研究了固定化啤酒酵母菌对锶的吸附机制和吸附热力学。结果表明:(1)吸附Sr2+后的固定化啤酒酵母菌的内部结构更松散,更有利于固定化啤酒酵母菌对Sr2+的吸附。(2)固定化啤酒酵母菌吸附Sr2+后,部分-OH参与了吸附,使形成的氢键部分断开,振动峰发生蓝移。另外,由于-NH2和-CO-NH-中的N原子可提供孤对电子与有空轨道的Sr2+配位,从而改变了基团的极性。(3)当Sr2+初始质量浓度为10～200mg/L时,固定化啤酒酵母菌对Sr2+的吸附同时符合Freundlich和Langmuir吸附模型,但符合Langmuir吸附模型的程度更优,这说明固定化啤酒酵母菌与Sr2+之间主要通过分子间引力产生吸附,是以单分子层吸附为主的物理吸附。 |
| 关 键 词： | 啤酒酵母菌 固定化 Sr2+ 生物吸附 |
The mechanism and thermodynamics of strontium ions biosorption by immobilized Saccharomyces cerevisiae |
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| YANG Yushan , DONG Faqin , ZHANG Wei , NIE Xiaoqin.The mechanism and thermodynamics of strontium ions biosorption by immobilized Saccharomyces cerevisiae[J].Environmental Pollution & Control,2012,34(1):5-8. | |
| Authors: | YANG Yushan DONG Faqin ZHANG Wei NIE Xiaoqin |
| Institution: | 1.(1.National Defence Key Discipline Lab of Nuclear Wastes and Environmental Safety,School of National Defense Science and Technology,Southwest University of Science and Technology,Mianyang Sichuan 621010;2.The Key Laboratory of Treatment and Resource Recovery of Solid Wastes,Ministry of Education,The office of the Party Committee,Southwest University of Science and Technology,Mianyang Sichuan 621010;3.Analytical and Testing Center,Southwest University of Science and Technology,Mianyang Sichuan 621010) |
| Abstract: | Immobilized Saccharomyces cerevisiae was prepared with polyvinyl alcohol(PVA) and sodium alginate(SA) as carrier.The obtained immobilized Saccharomyces cerevisiae was applied as adsorbent for biosorption of Sr2+ from solution,the adsorption mechanism and thermodynamics were studied.Results showed that Sr2+ adsorption could looser the inner structure of immobilized Saccharomyces cerevisiae,which could inverse enhance the Sr2+ adsorption.Part of-OH involved in the Sr2+ adsorption and caused to the disconnection of the formed hydrogen bond,so the blue shift of vibration peak was observed.The N atoms in-NH2 and-CO-NH-could provide isolate pair of electron to coordinate with Sr2+,which changed the polarity of the groups.When concentration of Sr2+ ranged 10-200 mg/L,the sorption process was in accordance with both Langmuir and Freundlich isotherm,but better complied with Freundlich model,which indicated that Sr2+ was adsorbed by attractive forces between molecules,and the absorption behavior was monolayer physical absorption. |
| Keywords: | Saccharomyces cerevisiae immobilization Sr2+ biosorption |
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