中文摘要：

采用柠檬酸杆菌生物吸附剂，吸附重金属镉。考察了柠檬酸杆菌吸附Cd^2＋过程中的影响因素，包括pH、菌浓度和金属离子浓度。结果表明，柠檬酸杆菌对Cd^2＋的吸附随pH的增大而增大，当pH为7时吸附率达到最大值；当菌体浓度为4.0g·L^-1。时，吸附率达89.45％；当溶液中Cd^2＋起始浓度为20mg·L^-1时，菌体对Cd^2＋的吸附率最大，达到93.12％；其吸附等温线符合Langmuir和Freundlich模型，但Langmuir模型拟合效果更好。

英文摘要：

Citrobacter freudii was used as the biosorbent to adsorb heavy metal ion-cadmium. The factors which affect the adsorption of Cd^2＋ by Citrobacter freudii were investigated, including pH, the strain dosage and the initial concentrate of Cd^2＋. The results showed that the adsorption efficiency increased with the increase ofpH and reached its maximum at pH 7; when the strain dosage and the initial concentrate of Cd^2＋ were 4.0g·L^-1 and 20mg·L^-1, respectively, the adsorption efficiency reached 89.45% and 93.12%, respectively. The adsorption pattern of Cd^2＋ on Citrobacter freudii was in accordance with Langmuir and Freundlich isotherm, but the Langrnuir isotherm is better.