细菌纤维素的制备及其吸附Cd^(2+)的研究  

Preparation of Bacterial Cellulose and Its Adsorption of Cd^(2+)

作　　者：鲁敏[1] 李彦英 关晓辉[2] 魏德洲[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004 [2]东北电力大学化学工程学院,吉林省吉林市132012

出　　处：《东北大学学报（自然科学版）》2010年第8期1196-1199,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50174014);辽宁省科技攻关项目(2009221006);吉林市科技发展计划项目(2007011)

摘　　要：以木葡糖酸醋杆菌为菌株,通过L18(37)正交试验优化发酵生产细菌纤维素的条件.将制得的细菌纤维素用于吸附重金属离子Cd2+,考察了溶液pH值、吸附时间等因素对吸附效果的影响,并进一步模拟吸附动力学和吸附等温线.结果表明,纤维素制备的最佳发酵条件为:玉米浆干粉5%,蔗糖6%,发酵液初始pH值6.0,菌种加入量12%,二级种子活化时间22 h及静态发酵时间7 d.在此条件下纤维素产量为12.36 g/L.pH值是影响细菌纤维素对Cd2+吸附效果的重要参数.对Cd2+的吸附符合二级反应动力学特征和Langmuir吸附等温方程,并具有良好的线性,说明细菌纤维素对Cd2+是典型的单分子层吸附.Taking the Gluconacetobacter xylinus Gyll as strain,the fermentation conditions for the preparation of bacterial cellulose was optimized by L18（37） orthogonal test,and the bacterial cellulose thus prepared was used for the adsorption of Cd2＋.Then,the effects of such performance parameters as pH value and adsorbing time on the efficiency of adsorption were investigated,with the adsorption kinetics and adsorption isotherms simulated.The results showed that the optimal ferment conditions for preparing bacterial cellulose are as follows： corn steep powder 5%,sucrose 6%,the initial medium pH value 6.0,fermentation broth inoculum 12%,the second species of seed age for enlargement cultivation 22 hr and static culture period 7 days.The highest yield of bacterial cellulose is 12.36 g/L.In the process with bacterial cellulose as sorbent for removing Cd2＋,the pH value is a very important parameter to the adsorption efficiency.The adsorption rate could be well fitted by pseudo-second rate model, and the adsorption isotherm could be described by Langmuir model,both having good linearity.All these facts verify that the bacterial cellulose provides a typical monomolecular-layer adsorption of Cd2＋.

关 键 词：木葡糖酸醋杆菌 细菌纤维素 重金属吸附 Cd2+ 

分 类 号：TQ342.86[化学工程—化纤工业]