ε-聚赖氨酸生产废菌体对六价铬吸附影响的研究  

Biosorption of Chromium(Ⅵ) by Waste Biomass of ε-Poly-L-lysine Fermentation

作　　者：曹玉娟[1,2] 张扬[1,2] 夏军[1,2] 徐虹[1,2] 冯小海[1,2] 

机构地区：[1]南京工业大学食品与轻工学院,南京210009 [2]南京工业大学材料化学工程国家重点实验室,南京210009

出　　处：《环境科学》2012年第2期499-504,共6页Environmental Science

基　　金：国家自然科学基金项目(21006050);江苏省农业支撑基金项目(BE2009363);江苏省自然科学基金项目(BK2010550);中国博士后科学基金项目(20100471326);教育部高等学校博士学科点专项科研基金项目(20103221120007)

摘　　要：以ε-聚赖氨酸(ε-PL)发酵生产废菌体小白链霉菌(Streptomyces albulus)PD-1为研究对象,探讨了其对吸附Cr(Ⅵ)的影响.实验过程中,对预处理方式、pH、初始Cr(Ⅵ)浓度、吸附时间和温度等因素进行了考察.结果表明,HCl预处理的菌体具有较好的吸附能力,Cr(Ⅵ)的吸附增加率达到22.7%,最佳pH为2.0左右,温度对Cr(Ⅵ)的吸附影响不大.实验过程中分别采取Langmuir和Freundlich 2种吸附等温模型对实验数据进行了拟合,得到2个模型的线性相关系数R2分别为0.979 4和0.979 8,这表明吸附过程中既存在单层吸附同时也存在复杂的多层吸附,小白链霉菌对Cr(Ⅵ)的最大理论吸附量为23.92mg.g-1.通过傅里叶变换红外光谱分析,酰胺基和羟基等基团在吸附过程中起主要作用.The sorption of hexavalent chromium by waste biomass of ε-Poly-L-lysine fermentation strains（Streptomyces albulus） PD-1 was studied.Effects of pretreatment ways,pH,initial concentration of Cr（Ⅵ）,contact time and temperature on biosorption were determined.It was found that homogenization in HCl was the best way to pretreat mycelia,having an increased rate of Cr（Ⅵ） biosorption at 22.7%,the optimum pH was about 2.0,while no significant impact of temperature on the biosorption was observed.The fitness of the experimental data for the Langmuir and Freundlich adsorption models was further examined and good correlations with R2 of 0.979 4 and 0.979 8 were observed,indicating the presence of both monolayer biosorption and heterogeneous surface condition.The maximum adsorption capacity of the Streptomyces albulus PD-1 for Cr（Ⅵ） was 23.92 mg·g-1.FT-IR analysis demonstrates that the major functional groups（amide and hydroxyl） may contribute to the absorption of Cr（Ⅵ）.

关 键 词：生物吸附 小白链霉菌 Cr(Ⅵ) 预处理 红外光谱 

分 类 号：X703.1[环境科学与工程—环境工程]