硝基还原假单胞菌吸附重金属镉的机理研究

发布时间：2018-01-09 07:27

本文关键词：硝基还原假单胞菌吸附重金属镉的机理研究　出处：《中国环境科学》2017年06期 　论文类型：期刊论文

【摘要】：系统研究了硝基还原假单胞菌对重金属镉的吸附特性与吸附机理.研究结果表明,此株菌可以耐受200mg/L重金属镉,而进一步提高镉离子的浓度则会显著抑制该菌的生长.将该菌株接种至含20、50和100mg/L Cd~(2+)的液体LB培养基中,经过120h的培养,镉的去除率分别能达到94.3%,91.0%和86.0%.系统研究了pH值、温度、盐浓度和多种重金属离子存在下,该菌株对溶液中镉离子去除效果的影响.结果表明,硝基还原假单胞菌可以在pH值为4~8范围内有效吸附镉离子,当NaCl溶液提升至1mol/L时,该菌株仍可耐受,并且可以吸附除了铅离子之外的多种重金属离子.X射线光电子能谱分析结果显示,吸附后Cd~(2+)的结合能发生了变化.扫描电镜结果显示,与正常菌株相比,吸附镉的菌株产生明显形变,且表面有白色颗粒状物质吸附,结合X射线光电子能谱分析结果,可以说明生物矿化是该菌株吸附和钝化重金属的途径之一.
[Abstract]:The system of Pseudomonas nitroreducens on Cadmium Adsorption Properties and adsorption mechanism. The results showed that this bacterium can tolerate 200mg/L cadmium, and further improve the concentration of cadmium ions could significantly inhibit the growth of bacteria. The strains were inoculated with 20,50 and 100mg/L Cd~ (2+) LB liquid culture in the medium, after 120h cultivation, the removal rate can reach 94.3%, temperature 91% and 86.0%. system on the pH value, existing salt concentration and heavy metal ions, the removal effect of the solution of cadmium ion in this strain. The results showed that Pseudomonas nitroreducens can in the pH value range of 4~8 the effective adsorption of cadmium ion, when NaCl solution to 1mol/L, the strain can be tolerated, and may in addition to outside lead ion adsorption of heavy metal ions.X ray photoelectron spectroscopy analysis showed that the adsorption of Cd~ (2+). He can change. Scanning electron microscopy showed that compared with the normal strain, the adsorption of cadmium and the surface strains produced obvious deformation, white granular material with X adsorption, X-ray photoelectron spectroscopy analysis results can explain the biomineralization is one of the ways of the strain and passivation of heavy metal adsorption.

【作者单位】：辽宁石油化工大学石油化工学院;清华大学化学工程系;安徽皖南烟叶责任有限公司;中国烟草总公司安徽省公司;
【基金】：国家自然科学基金(21276139)
【分类号】：X172
【正文快照】： 司安徽省公司,安徽合肥230022)重金属镉广泛存在充电电池、电子设备、釉料、绘画、塑料和磷肥中[1-2].环境中的镉元素主要源于人类的工业和农业不断地排放[3].镉离子可以从植物根部迁移到地表组织中,并经食物链最终进入人体器官.镉作为生物体内非必需元素,对动植物产生巨大危

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