摘要
以海藻酸钠为包埋剂固定化酿酒酵母,以固定化后酵母作为吸附剂,研究其对重金属离子Cu^(2+)、Mn^(2+)、Pb^(2+)、Zn^(2+)、Cd^(2+)的吸附作用。试验表明,相同条件下,固定化酵母对5种重金属离子的吸附效果为Cu^(2+)>Mn^(2+)>Pb^(2+)>Zn^(2+)>Cd^(2+)。以吸附效果较好的Mn^(2+)、Cu^(2+)离子为研究对象,考察吸附剂用量、初始质量浓度、吸附时间、温度、p H对吸附的影响。结果表明,除温度外,吸附剂初始质量浓度、投放量、吸附时间、pH对吸附效果都有较大影响。固定化酵母对Cu^(2+)的最佳的吸附条件为:温度30℃、初始质量浓度50 mg/L、吸附剂投放量1.5 g、时间4 h、pH 4。对Mn^(2+)的最佳的吸附条件为:温度30℃、初始质量浓度40 mg/L、吸附剂投放量2 g、时间4 h、pH 2。固定化酵母对Cu^(2+)、Mn^(2+)最大吸附率分别为70.36%和40.5%。Mn^(2+)、Cu^(2+)离子共存时,固定化酿酒酵母对2种离子的吸附效率都明显升高,表明2种重金属离子的竞相吸附相互促进。
Sodium alginate was used as embedding agent,immobilized Saccharomyces cerevisiae was used as adsorbent to adsorb heavy metal ions Mn^(2+),Cd^(2+),Pb^(2+),Cu^(2+),Zn^(2+).The results showed that the adsorption effect of immobilized yeast on the five heavy metal ions was as follows:Cu^(2+)>Mn^(2+)>Pb^(2+)>Zn^(2+)>Cd^(2+),with same the initial concentration.The best adsorption effect was the heavy metal Cu^(2+),Mn^(2+).Taking Cu^(2+)and Mn^(2+)ions as research objects,the effects of initial concentration,adsorbent dosage,adsorption time,temperature and pH on adsorption were studied.The results showed that the initial concentration,amount of adsorbent,adsorption time and pH had great influence on the adsorption effect except temperature.The optimum adsorption condition for Cu^(2+)was as follows:temperature 30℃,initial concentration 50 mg/L,adsorbent dosage 1.5 g,time 4 h,pH 4.The optimum condition for the immobilized yeast to adsorb Mn^(2+)was as follows:the temperature 30℃,the initial concentration 40 mg/L,the dosage of adsorbent 2 g,the time 4 h,and the pH 2.The maximum adsorption rates of Cu^(2+)and Mn^(2+)by immobilized yeast were 70.36%and 40.5%respectively.When Mn^(2+)and Cu^(2+)coexist,the adsorption efficiency of immobilized Saccharomyces cerevisiae for both of them increased significantly,indicating that the competitive adsorption of the two heavy metal ions promoted each other.
作者
孟君
丁慧娇
陈鑫
张峻松
韩永辉
郑炬萍
MENG Jun;DING Huijiao;CHEN Xin;ZHANG Junsong;HAN Yonghui;ZHENG Juping(School of Food and Bioengineering,Zhengzhou University of Light Industry,Zhengzhou 450002)
出处
《食品工业》
CAS
2022年第6期224-228,共5页
The Food Industry
基金
校星空众创空间创新培育孵化项目(2020ZCKJ217)。
关键词
固定化
重金属离子
酿酒酵母
吸附率
竞相吸附
immobilization
heavy metal ion
Saccharomyces cerevisiae
adsorption rate
competing adsorption
