Document Detail


Preparation and application of acrylic acid grafted polytetrafluoroethylene fiber as a weak acid cation exchanger for adsorption of Er(III).
MedLine Citation:
PMID:  19523764     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In this work, a weakly acidic ion exchange fiber (PTFE-g-AA) has been prepared by 60Co irradiation grafting with acrylic acid (AA) onto the polytetrafluoroethylene (PTFE) fiber. The grafted fiber was characterized by FTIR, SEM and TGA technique. The exchange capacity of the PTFE-g-AA fiber is 3.87 mmol/g. The adsorbent material was employed for Er(III) uptaking by batch and column experiments. Kinetics studies showed that the adsorption process obeyed pseudo-second-order kinetics. The adsorption isotherms followed both the Freundlich model and Langmuir model. The maximum adsorption capacity of the PTFE-g-AA fiber for Er(III) was evaluated to be 142.0mg/g for the Langmuir model. It was found that 0.75 M HCl-0.25 M NaCl solution provided effectiveness of the desorption of Er(III) from the PTFE-g-AA fiber. Various thermodynamic parameters such as standard enthalpy (DeltaH(0)), standard entropy (DeltaS(0)) and standard free energy (DeltaG(0)) were evaluated. The adsorption of Er(III) on the PTFE-g-AA fiber was found to be endothermic in nature. The Thomas model was successfully applied to experimental data to predict the breakthrough curves and to determine the characteristics parameters of the column useful for process design.
Authors:
Chunhua Xiong; Caiping Yao
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-05-22
Journal Detail:
Title:  Journal of hazardous materials     Volume:  170     ISSN:  1873-3336     ISO Abbreviation:  J. Hazard. Mater.     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-08-31     Completed Date:  2009-12-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  1125-32     Citation Subset:  IM    
Affiliation:
Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou-310012, China. xiongch@163.com
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MeSH Terms
Descriptor/Qualifier:
Acrylates / chemistry*
Adsorption
Cation Exchange Resins / chemistry*
Erbium / chemistry*,  isolation & purification
Hydrogen-Ion Concentration
Kinetics
Microscopy, Electron, Scanning
Mineral Fibers
Models, Statistical
Polytetrafluoroethylene / chemistry*
Solutions
Spectrophotometry, Infrared
Temperature
Thermodynamics
Thermogravimetry
Water
Chemical
Reg. No./Substance:
0/Acrylates; 0/Cation Exchange Resins; 0/Mineral Fibers; 0/Solutions; 7440-52-0/Erbium; 7732-18-5/Water; 79-10-7/acrylic acid; 9002-84-0/Polytetrafluoroethylene

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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