固定化啤酒废酵母对Cr^(6+)吸附行为的研究

Biosorption of Cr(Ⅵ)by Immobilized Discarded Brewers Yeast

用啤酒废酵母作吸附剂,以海藻酸钠作包埋剂将酵母固定化制作成小球,分别从吸附时间、温度、Cr6+溶液质量浓度、pH等因素,研究啤酒废酵母菌体对Cr6+的吸附特性。确定固定化啤酒废酵母对Cr6+吸附的最佳条件为:吸附时间2 h、温度25℃、Cr6+溶液质量浓度60 mg/L、pH为2。在该条件下,对Cr6+最大吸附率为94.71%。其中,Ca2+、Na+、Mg2+、Cu2+不会干扰啤酒废酵母对Cr6+的吸附,以1 mol/L盐酸的解吸效果最佳,解吸率达94.1%。

Discarded brewers yeast was entrapped immobilized discarded brewers yeast were studied. in sodium alginate. Properties on biosorption of Cr （ VI ）by It is shown that factors, such as adsorption time, initial pH,immobilized biomass concentration,Cr （VI）initial concentration,etc, affect adsorption process. The optimal adsorption conditions for immobilized discarded brewers yeast were as follows ： pH 2, Cr（ VI ）initial concentration 60 mg/L,25 ℃ ,adsorption time 2 h. Under these conditions ,the biosorption efficiency of Cr （ VI ）was 94.71%. Ca〉,Na＋,Mg2＋,Cu2＋ were not affect the Cr （ VI ）adsorption process. 94.1% of Cr （ VI ）could be recovered from immobilized discarded brewers yeast adsorbed Cr（VI ）, desorbed with 1 mol/L HC1 for 2 h.