鱼腥蓝细菌PCC 7120对Mn2+的吸附
Assaying Mn2+biosorption of Anabaena sp. strain PCC 7120

寻找新型生物吸附剂用于重金属污染环境的修复，本研究通过设置不同时间、质量浓度以及氮源缺乏等条件，检测了鱼腥蓝细菌PCC 7120对Mn2+的吸附情况。结果表明：在Mn2+质量浓度低于10 mg/L时，PCC 7120对Mn2+的去除率最高能达到80%，并且PCC 7120对Mn2+的吸附过程符合Freundlich等温吸附模型和准二级吸附动力学方程。缺氮后，PCC 7120对Mn2+的耐受力降低且吸附能力大大减弱。
Bacteria are widely used for studying the heavy metal biosorption recently.In the study,the removal rate of Mn2+ under normal concentration and law of biosorption about Mn2+ using PCC 7120 were obtained.The results showed that a high desorption efficiency (above 80%) was obtained under the low concentation (10 mg/L) of Mn2+.The biosorption equilibrium data are fitted well with the Freundlich adsorption isotherm and kinetic studies,indicating that the biosorption follows the pseudo second order model.The tolerance of PCC 7120 to Mn2+ is impaired and the adsorption capacity is greatly diminished after nitrogen deficiency.