灭活酿酒酵母对水中Ni2+的吸附去除

摘要

以灭活酿酒酵母菌为生物吸附剂,研究吸附剂对水中的镍离子吸附.考察了溶液初始pH、菌体投加量、温度等因素对吸附镍离子的影响,并对灭活酿酒酵母菌吸附镍离子的吸附动力学和吸附等温线进行了研究.通过动电电位分析,表明实验用的灭活酿酒酵母等电点介于3～4之间.当溶液的pH为7,吸附能力较好,灭活酵母菌对镍离子吸附量可达128.33 mg/g.随着酵母菌投加量增加,其对镍离子吸附量也随之下降.对灭活酵母吸附Ni2+的数据进行动力学分析,发现灭活酵母菌对Ni2+的吸附符合准二级动力学吸附模型,吸附量理论值qcal为133.33 mg/g.对酵母菌吸附镍离子的等温吸附数据进行分析,表明灭活酵母菌对Ni2+的吸附符合Langmuir等温模型.在30℃时,酵母菌对镍离子的饱和吸附量可达83.33 mg/g.%Inactivated Saccharomyces cerevisiae was used as biosorption agent to study the adsorption of Ni2+ ions. The influences of the initial pH of the solution, the amount of yeast and the temperature on the adsorption of nickel ions were investigated, and the adsorption kinetics and adsorption isotherm of Ni2+ ions were also studied. The electrokinetic potential analysis showed that the isoelectric point of inactivated saccharomycescerevisiaewasbetween 3 and 4.WhenthepHvalueofthesolutionwas 7, theadsorption capacity was good, and the inactivated yeast can adsorb the Ni2+ ions to 128.33 mg/g. As the amount of yeast increased, the adsorption of Ni2+ ions decreased. Kinetic analysis was conducted on the adsorption of Ni2+ by inactivated yeast, and the adsorption of inactivated yeast to Ni2+ions was consistent with the quasi-second-order kinetic adsorption model. The theoretical value of adsorption was 133.33 mg/g. The isothermal adsorption data of Ni2+ ions adsorbed by yeast were analyzed, and the adsorption of inactivated yeast to Ni2+ ions was consistent with the Langmuir isothermal model.At 30℃, the yeast saturated adsorption amount of Ni2+ ions can reach 83.33 mg/g.