Aeromonas veronii N8活性菌体对Zn^(2+)的吸附特征

Biosorption characteristic of Zn^(2+) by viable cells of Aeromonas veronii N8

以Aeromonas veronii N8菌为对象,对菌体的性质及其吸附Zn^(2+)特征进行研究。结果表明,Aeromonas veronii菌的生长周期在66h左右,并且Zn^(2+)对该菌的最低抑菌质量浓度为150mg/L;N8菌体对Zn^(2+)的吸附随时间的增加,吸附率逐渐增大,并且在90min后达到吸附平衡。菌体的吸附率随菌体质量浓度的增加而变大,并随Zn^(2+)质量浓度的增加而变小。吸附前、后扫描电镜及能谱分析(scanning electron microscope-energy dispersive X-ray,SEM-EDX)的表征结果显示,在菌体的细胞壁表面检测到Zn元素,说明Aeromonas veronii N8菌体对Zn^(2+)具有一定的吸附作用。菌体的Zn^(2+)吸附过程可采用Toth模型进行描述。

The properties and Zn^2＋ adsorption characterizations oi Aeromonas veronii N8 bacteria were studied. The results show that A. veronii N8 bacteria growth cycle is about 66 h, and the minimum inhibitory concentration of Zn^2＋ to A. veronii N8 is 150 mg/L; adsorption rates of Zn^2＋ by the A. veronii N8 cell increase with time, the adsorption balance of bacteria could be achieved for 90 min Additionally, the adsorption rates of bacteria are increased with the bacteria concentration and decreased with the Zn^2＋ concentration Viable cell adsorption Zn^2＋ latter, element zinc is detected in the surface of bacterial cell wall suggesting that A. Veronii N8 cell has a certain adsorption ability for Zn^2＋. The Zn^2＋ adsorption process of bacteria might be described by Toth models.