黑曲霉磁性生物吸附剂制备及其吸附低浓度铀性能研究
|
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.
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.
引文
[1]王晓彧,郑新艳,沈扬皓,等.酵母菌对低浓度铀的吸附机理及动力学研究[J].环境科学学报,2017,37(1):169-177.
[2]Zhang T,Zhou Y,Bu X,et al.Bio-inspired fabrication of hierarchically porous Mg-Al composites for enhanced BSA adsorption properties[J].Microporous Mesoporous Mater,2014,188:37-45.
[3]Valenti L E,Smania A M,De Pauli C P,et al.Driving forces for the adsorption of a His-tag Chagas antigen.A rational approach to design bio-functional surfaces[J].Colloids Surf B Biointerfaces,2013,112:294-301.
[4]Shin K Y,Hong J Y,Jang J.Heavy metal ion adsorption behavior in nitrogen-doped magnetic carbon nanoparticles:Isotherms and kinetic study[J].J Hazard Mater,2011,190:36-44.
[5]Rezvani A,Jahanshahi M,Najafpour G D.Characterization and evaluation of the novel agarose-nickel composite matrix for possible use in expanded bed adsorption of bioproducts[J].J Chromatogr A,2014,1331:61-68.
[6]Hong B,Yang F,Guo H,et al.Synthesis,complexation,and mesomorphism of novel calixarene-linked discotic triphenylene based on click chemistry[J].Tetrahedron Lett,2014,55(1):252-255.
[7]Li L,Huang F,Yuan Y,et al.Preparation and sorption performance of magnetic 18-crown-6/Fe3O4nanocomposite for Uranium(VI)in solution[J].J Radioanal Nucl Chem,2013,298(1):227-235.
[8]Ding Congcong,Cheng Wencai,Sun Yubing,et al.Novel fungus-Fe3O4bio-nanocomposites as high performance adsorbents for the removal of radionuclides[J].Journal of Hazardous Materials,2015(295):127-137.
[9]Ding Dexin,Xin Xin,Li Le,et al.Removal and recovery of U(VI)from low concentration radioactive wastewater by ethylenediamine-modified biomass of aspergillus niger[J].Water Air Soil Pollut,2014,225:2206.
[10]Kushwaha S,Sudhakar P P.Sorption of uranium from aqueous solutions using palm-shell-based adsorbents:a kinetic and equilibrium study[J].Journal of Environmental Radioactivity,2013,126:115-124.
[2]Zhang T,Zhou Y,Bu X,et al.Bio-inspired fabrication of hierarchically porous Mg-Al composites for enhanced BSA adsorption properties[J].Microporous Mesoporous Mater,2014,188:37-45.
[3]Valenti L E,Smania A M,De Pauli C P,et al.Driving forces for the adsorption of a His-tag Chagas antigen.A rational approach to design bio-functional surfaces[J].Colloids Surf B Biointerfaces,2013,112:294-301.
[4]Shin K Y,Hong J Y,Jang J.Heavy metal ion adsorption behavior in nitrogen-doped magnetic carbon nanoparticles:Isotherms and kinetic study[J].J Hazard Mater,2011,190:36-44.
[5]Rezvani A,Jahanshahi M,Najafpour G D.Characterization and evaluation of the novel agarose-nickel composite matrix for possible use in expanded bed adsorption of bioproducts[J].J Chromatogr A,2014,1331:61-68.
[6]Hong B,Yang F,Guo H,et al.Synthesis,complexation,and mesomorphism of novel calixarene-linked discotic triphenylene based on click chemistry[J].Tetrahedron Lett,2014,55(1):252-255.
[7]Li L,Huang F,Yuan Y,et al.Preparation and sorption performance of magnetic 18-crown-6/Fe3O4nanocomposite for Uranium(VI)in solution[J].J Radioanal Nucl Chem,2013,298(1):227-235.
[8]Ding Congcong,Cheng Wencai,Sun Yubing,et al.Novel fungus-Fe3O4bio-nanocomposites as high performance adsorbents for the removal of radionuclides[J].Journal of Hazardous Materials,2015(295):127-137.
[9]Ding Dexin,Xin Xin,Li Le,et al.Removal and recovery of U(VI)from low concentration radioactive wastewater by ethylenediamine-modified biomass of aspergillus niger[J].Water Air Soil Pollut,2014,225:2206.
[10]Kushwaha S,Sudhakar P P.Sorption of uranium from aqueous solutions using palm-shell-based adsorbents:a kinetic and equilibrium study[J].Journal of Environmental Radioactivity,2013,126:115-124.