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

中国有色金属学报, 2016, 26(7): 1568-1575.

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

肖方竹 ^1, , 何淑雅 ^2, , 彭国文 ^3, , 唐艳 ^4, , 戴益民 ^5,

1.南华大学生物化学与分子生物学国防支撑学科实验室,衡阳,421001

2.南华大学生物化学与分子生物学国防支撑学科实验室,衡阳,421001

3.南华大学化学化工学院,衡阳421001;中南大学资源与安全工程学院,长沙410083

4.南华大学生物化学与分子生物学国防支撑学科实验室,衡阳,421001

5.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,长沙410004

基金项目: 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)Projects(51574152,11205084,81272993) supported by the National Natural Science Foundation of China 湖南省科技厅项目(2014GK3079) 国家自然科学基金资助项目(51574152,11205084,81272993) Project(2014GK3079) supported by the Foundation of Hunan Province Science and Technology Department,China Project(2016CL03) supported by the Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation,China

关键词：功能化 , 磁性载体 , 耐辐射奇球菌 , 铀 , 吸附机理

Adsorption behavior and mechanism of uranium (Ⅵ) on Deinococcus radiodurans immobilized functionalization magnetic carrier

Keywords： functionalization , magnetic carrier , Deinococcus radiodurans , uranium , adsorption mechanism

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Fe3O4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.

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