【作者】 高达；

【导师】 赵瑞雪；

【作者基本信息】 长春理工大学 ， 无机化学， 2010， 硕士

【摘要】 本文以1:2的聚乙烯醇-海藻酸钠为包埋剂固定化啤酒酵母吸附重金属离子,结果如下。固定化啤酒酵母对Zn²⁺吸附的最佳条件是:0.1mol/L HCl预处理的啤酒酵母,pH值为6.0,吸附时间为40min,质量浓度为4%的CaCl₂溶液,Zn²⁺初始浓度为50mg/L,吸附率为65.72%。1.0mol/L的HCl作解吸剂时,解吸率为96.50%。固定化啤酒酵母对Cd²⁺吸附的最佳条件是:pH值为6.30,Cd²⁺初始浓度为50mg/L,菌体浓度为6.3g/L,吸附时间为120min,吸附温度为24.5℃时,Cd²⁺的吸附率是79.44%。固定化啤酒酵母对重金属混合离子Pb²⁺、Cu²⁺、Zn²⁺、Cd²⁺吸附的最佳条件是:pH值为5.0,初始浓度均为100mg/L,菌体浓度为20g/L,吸附时间为2h,吸附温度为36℃时,Pb²⁺、Cu²⁺、Zn²⁺、Cd²⁺的吸附率分别为95.80%,90.20%,68.04%,87.04%;最佳解吸条件:解吸剂为0.5mol/L的HCl,解吸温度为36℃,解吸时间为0.5h时,Pb²⁺、Cu²⁺、Zn²⁺、Cd²⁺的解吸率分别为82.45%,69.87%,64.99%,75.57%;第二次吸附及再解析,Pb²⁺、Cu²⁺、Zn²⁺、Cd²⁺的吸附率分别为93.55%,69.58%,45.67%,46.18%;解吸率分别为56.08%,66.30%,49.64%,63.45%。固定化小球经过两次吸附与解吸后明显变小,继续使用吸附效果明显下降。更多还原

【Abstract】 In this paper,we used beer yeast embedded in sodium alginate and polyvinyl alcohol which mix by 1:2 as embedding medium adsorbed heave metal cations in waste water,the results were the following. The optimal conditions of the beer yeast adsorbed Zn²⁺ showed that: beer yeast was pretreated by the 0.1mol/LHCl,pH value was 6.0, adsorption time was 40min, 4% of mass concentration of CaCl₂ solution, the initial concentration of Zn²⁺ was 50mg/L, adsorption rate was 65.72%. when the strippant was 1.0mol/L HCl,desorption rate was 96.50%.The optimal conditions of the beer yeast adsorbed Cd²⁺ showed that: pH value was 6.3,the initial concentration of Cd²⁺ was 50mg/L,the cell concentration was 6.3g/L, adsorption time was 120min,when adsorption temperature was 24.5℃,adsorption rate was 79.44%.The optimal conditions of the beer yeast adsorbed mixed heavy metal cations Pb²⁺,Cu²⁺,Zn²⁺,Cd²⁺ showed that: pH value was 5.0, the initial concentration of Pb²⁺,Cu²⁺,Zn²⁺,Cd²⁺ were 100mg/L, the cell concentration was 20g/L, adsorption time was 2h, when adsorption temperature was 36℃, adsorption rate were respectively 95.80%,90.20%,68.04%,87.04%;The optimal conditions of desorption showed that: when the strippant was 0.5mol/LHCl,desorption temperature was 36℃, desorption time was half an hour, desorption rate for Pb²⁺,Cu²⁺, Zn²⁺,Cd²⁺ were respectively 82.45%,69.87%,64.99%,75.57%;adsorbed and desorbed again,adsorption rate for Pb²⁺,Cu²⁺,Zn²⁺,Cd²⁺ were respectively 93.55%,69.58%,45.67%,46.18%;desorption rate were respectively 56.08%,66.30%,49.64%,63.45%. The immobilized ball would getting smaller by twice adsorption and desorption. If it continues,the effects was sharply decreased.更多还原