期刊
PROCESS BIOCHEMISTRY
卷 42, 期 6, 页码 934-942出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.procbio.2007.03.001
关键词
immobilized cells; azo dyes; decolorization; sol-gel; alginate; silicate
Pseudomonas luteola was immobilized by entrapment in alginate-silicate sol-gel beads for decolorization of the azo dye, Reactive Red 22. The influences of biomass loading and operating conditions on specific decolorization rate and dye removal efficiency were studied in details. The immobilized cells were found to be less sensitive to changes in agitation rates (dissolved oxygen levels) and pH values. Michaelis-Menten kinetics could be used to describe the decolorization kinetics with the kinetic parameters being 36.5 mg g(-1) h(-1), 300.1 mg l(-1) and 18.2 mg g(-1) h(-1), 449.8 mg l(-1) for free and immobilized cells, respectively. After five repeated batch cycles, the decolorization rate of the free cells decreased by nearly 54%, while immobilized cells still retained 82% of their original activity. The immobilized cells exhibited better thermal stability during storage and reaction when compared with free cells. From SEM observation, a dense silicate gel layer was found to surround the macroporous alginate-silicate core, which resulted in much improved mechanical stability over that of alginate beads when tested under shaking conditions. Alginate-silicate matrices appeared to be the best matrix for immobilization of P. luteola in decolorization of Reactive Red 22 when compared with previous results using synthetic or natural polymer matrices. (C) 2007 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据