黑曲霉磁性生物吸附剂制备及其吸附低浓度铀性能研究  

Preparation of nano-Fe_3O_4 modified Aspergillus niger and its properties for adsorption of low concentration uranium(Ⅵ)

作　　者：成彬[1,2] 李乐 丁德馨[2] 廖琪[3] 卢炜[1,2] 戴仲然 胡南 张辉[2] 

机构地区：[1]南华大学公共卫生学院,湖南衡阳421001 [2]南华大学铀矿冶生物技术国防重点学科实验室,湖南衡阳421001 [3]南华大学化学化工学院,湖南衡阳421001

出　　处：《应用化工》2018年第2期219-223,共5页Applied Chemical Industry

基　　金：国家自然科学基金项目(11405081);湖南省自然科学基金(2017JJ3276);湖南省教育厅优秀青年项目(17B226);湖南省环保厅项目(湘财建指2016[59]号文23号);湖南省研究生创新项目(CX2017B560);南华大学大学生研究性学习和创新性实验计划(南华教[2015]26号;编号20)

摘　　要：以亲铀真菌黑曲霉和纳米Fe_3O_4为原料,制备了一种新型黑曲霉磁性生物吸附剂(Nano-Fe_3O_4 modified Aspergillus niger,NFAN)。研究了初始p H值、吸附时间、吸附剂投加量以及铀初始浓度等对NFAN吸附铀酰离子的影响,分析了吸附铀过程的动力学及热力学规律。结果表明,NFAN在初始浓度为6 mg/L,p H=7,NFAN的用量为0.15 g/L,吸附4 h。在此条件下,NFAN的铀吸附量为60.05 mg/g,铀吸附率可达76.36%,吸附过程符合准二级动力学模型。The Aspergillus niger magnetic bioadsorbent NFAN( nano-Fe_3O_4 modified Aspergillus Niger,NFAN) was prepared by the Aspergillus niger and nano-Fe_3O_4. The influence of initial p H value,adsorption time,adsorbent dosage and initial concentration of uranium on uranium adsorption by NFAN was studied,analyzed the kinetic and thermodynamics of the adsorption process. The results show that under the optimum adsorption conditions that the initial pH value was 7 with 0. 15 g/L adsorbent dosage and 4 h adsorption time,the maximum adsorption efficiency of NFAN for 6 mg/L U( VI) solution amounted to76. 36%,and the maximum biosorption capacity reached 60. 05 mg/g,the adsorption kinetics followed pseudo-second-order kinetic model.

关 键 词：黑曲霉 纳米FE3O4 磁性生物吸附剂 铀酰离子 吸附性能 

分 类 号：TQ028.5[化学工程] TQ209