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Expanded graphite loaded with lanthanum oxide used as a novel adsorbent for phosphate removal from water: performance and mechanism study.
MedLine Citation:
PMID:  25284167     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Abstract A novel adsorbent of expanded graphite (EG) loaded with lanthanum oxide (EG-LaO) was prepared for phosphate removal from water and characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy. The effect of impregnation time, La(3+) concentration, activation time and activation temperature on the phosphate removal performance of the adsorbent were studied for optimization of preparation conditions. Isothermal adsorption studies suggested the Langmuir model fit the experimental data well. Adsorption kinetics investigation showed that the pseudo second-order model fit the experimental data quite well, indicating that the adsorption process is mainly a process of chemical adsorption, and chloride ions compete to react with the active sites of the adsorbent but do not prevent phosphate from adsorbing onto EG-LaO. The adsorption mechanism studies were performed by pH dependence study of the adsorption amount. The results demonstrated that the probable mechanisms of phosphate adsorption on EG-LaO were electrostatic and Lewis acid-base interactions in addition to ion exchange.
Authors:
Ling Zhang; Yan Gao; Mengxue Li; Jianyong Liu
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-10-6
Journal Detail:
Title:  Environmental technology     Volume:  -     ISSN:  0959-3330     ISO Abbreviation:  Environ Technol     Publication Date:  2014 Oct 
Date Detail:
Created Date:  2014-10-6     Completed Date:  -     Revised Date:  2014-10-7    
Medline Journal Info:
Nlm Unique ID:  9884939     Medline TA:  Environ Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  1-24     Citation Subset:  -    
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