摘要
将天然水体中吸附Pb2+和Cd2+的优势菌种固定化后进行吸附规律研究.结果发现,固定化细菌对重金属吸附的动力学过程包括快速阶段和慢速阶段,其中慢速阶段符合二级吸附速率方程.E lovich模型和双常数速率模型不能描述固定化细菌对Pb2+吸附的动力学过程,但能很好描述固定化细菌对Cd2+吸附的动力学过程.固定化细菌对重金属吸附热力学过程均可以用Henry模型描述,且其对Pb2+的亲和力比对Cd2+的亲和力强.
The adsorption rule of Pb^2＋ and Cd^2＋ onto immobilized dominating bacteria in natural water was studied. The results show that the adsorption dynamic process of the heavy metals onto immobilized bacteria includes a fast stage and a slow stage; the latter conforms to second-level adsorption rate equation. The Elovich model and the rate model with two constants cannot describe the dynamics process of the Pb^2＋ adsorption onto immobilized bacteria, but can describe the Cd^2＋ adsorption very well. The Henry model can describe the thermodynamics process of heavy metal adsorption, and the affinity for Pb^2＋ is stronger than for Cd^2＋.
出处
《吉林大学学报（理学版）》
CAS
CSCD
北大核心
2006年第6期1019-1022,共4页
Journal of Jilin University:Science Edition
基金
国家自然科学基金(批准号:205770141130702)
吉林大学创新基金(批准号:419070200046)
