功能化磁性载体固定耐辐射奇球菌及其对铀的吸附行为与机理

发布时间：2018-01-05 03:06

本文关键词：功能化磁性载体固定耐辐射奇球菌及其对铀的吸附行为与机理　出处：《中国有色金属学报》2016年07期 　论文类型：期刊论文

【摘要】：为了解决耐辐射奇球菌(DR)容易以悬浮态生长,菌体与水的密度差较小,吸附铀后难以分离等问题,首先使用氯化亚砜对羧基化磁性纳米Fe_3O_4粒子进行酰氯功能化,以此作为DR菌固定载体,再与二乙烯三胺化学修饰的DR菌进行固定化,得到一种新型功能化磁性耐辐射奇球菌吸附剂NFGDR,并通过红外光谱仪和扫描电镜分别表征吸附剂NFGDR的结构。考察溶液pH值、吸附时间、铀初始浓度和吸附剂投加量等因素对吸附剂NFGDR吸附铀的影响,对吸附动力学模型和吸附等温模型进行分析。结果表明:吸附剂NFGDR表面具有大量吸附铀的基团,吸附铀后表面形态发生变化;吸附铀的最佳条件是pH值为5、吸附时间为80 min、铀初始浓度为10 mg/L和吸附剂投加量为5 mg。吸附剂NFGDR对铀的吸附动力学过程符合准二级动力学模型,吸附等温线符合Langmuir等温线模型,说明该吸附体系是一个单层吸附过程。同时,使用3种不同的解析剂对吸附剂NFGDR解析再生6次后,其对铀的吸附率均在80%以上,说明其具有良好的再生性能。
[Abstract]:In order to solve the problem of Deinococcus radiodurans (DR) easy growth with suspended bacteria, and the water density difference is small, it is difficult to separate the problem after the adsorption of uranium, the first use of thionyl chloride to carboxylated magnetic nano Fe_3O_4 particles were functionalized as chloride, DR was immobilized carrier, DR bacteria and two ethylene amine chemistry three modification of fixed, a new functional magnetic Deinococcus radiodurans NFGDR adsorbent, structure and by infrared spectrometer and scanning electron microscopy characterization of NFGDR adsorbent. The influences of pH value of solution, adsorption time, initial concentration and effect of uranium adsorbent dosage on the adsorption of uranium adsorption agent NFGDR, on the adsorption kinetics model and adsorption isotherm model were analyzed. The results showed that the adsorbent NFGDR surface with a large number of uranium adsorption group, the change of surface adsorption of uranium; the optimum condition for adsorbing uranium is pH value is 5, adsorption Time is 80 min, the initial concentration of uranium is 10 mg/L and the dosage of the adsorbent with the pseudo two order kinetics model for the adsorption kinetics of 5 mg. adsorbent NFGDR for uranium, the adsorption isotherm accords with Langmuir isotherm model, indicating that the adsorption system is a monolayer adsorption process. At the same time, using 3 different analytical agent on the adsorbent NFGDR desorption regeneration after 6 times, the adsorption of uranium rates were above 80%, indicating that it has good regeneration performance.

【作者单位】：南华大学生物化学与分子生物学国防支撑学科实验室;南华大学化学化工学院;中南大学资源与安全工程学院;长沙理工大学化学与生物工程学字院电力与交通材料保护湖南省重点实验室;
【基金】：国家自然科学基金资助项目(51574152,11205084,81272993) 湖南省科技厅项目(2014GK3079) 长沙理工大学电力与交通材料保护湖南省重点实验室开放基金资助项目(2016CL03)~~
【分类号】：X753;X172
【正文快照】： 根据核军工的战略需求和核电的发展规划,为了满足核军工和核电对天然铀的日益增长需求,我国仍将加大铀矿开采和选冶的力度,与此同时,在铀矿开采和选冶过程中产生的含铀废水也会日益增多[1]。这些排放的含铀废水如果没有得到妥善处理,进入生态环境后将改变其环境本底辐射而致使

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