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一株抗Cd2+菌株的筛选及其吸附性能

Keywords: 重离子束,诱变,等温吸附模型,动力学,热力学

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Abstract:

Cd2+为一种毒性金属元素,为了实际解决污水中低浓度重金属污染,实现污水达标排放,通过12C6+重离子束辐照诱变技术筛选到一株耐受Cd2+的菌株C2,研究其对Cd2+的抗性和低浓度Cd2+的吸附性能表明,Cd2+浓度≤100mg/L时,C2菌株可以生长繁殖,但随Cd2+浓度升高受到抑制;SEM分析表明,受到Cd2+胁迫时,C2产生大量胞外产物与Cd2+形成络合物;吸附过程中菌粉表面空隙得到填充,形成凸起;红外光谱分析表明,吸附过程中的主要作用基团为醇羟基O—H键、氨基和酰胺基团;C2菌粉和固定化菌球都对Cd2+有较好的吸附能力,菌粉吸附效果比固定化菌球稍好;菌粉和固定化吸附剂的最佳吸附初始pH值为5~6.0,最佳投加量分别为1.0g/L和10g/L(实际含菌量为1.0g/L);Cd2+浓度在2~20mg/L时,在最佳吸附条件下,菌粉和固定化吸附剂对Cd2+的吸附率均在90%左右;2种吸附剂吸附过程与Langmuir等温模型和拟二级动力学模型拟合最佳;热力学研究表明吸附反应均能自发进行。以上研究结果表明,C2菌粉和固定化吸附剂均可用于污水中低浓度Cd2+的去除。

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