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Thermal treatment of attapulgite for phosphate removal: A cheap and natural adsorbent with high adsorption capacityoa mark
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Publication Year
2018-01-01
Journal
Desalination and Water Treatment
Publisher
Desalination Publications
Citation
Desalination and Water Treatment, Vol.114, pp.175-184
Keyword
AdsorptionAttapulgiteBatch experimentCa elutionP fractionationThermal treatment
All Science Classification Codes (ASJC)
Water Science and TechnologyOcean EngineeringPollution
Abstract
Attapulgite was used for the removal of phosphate in aqueous solution and was thermally treated to improve its phosphate adsorption capacity. Attapulgite treated at different temperatures was analyzed to characterize its physical and chemical properties and quantify its phosphate removal efficiency. Attapulgite treated at 700°C (700-ATP) was found to remove phosphate more efficiently than the attapulgite treated at the other temperatures did. The pseudo-second-order and Freundlich models were appropriate for describing phosphate adsorption onto 700-ATP for various reaction times and initial phosphate concentrations, respectively. Both enthalpy and entropy increased during phosphate adsorption onto 700-ATP. An increase in solution pH from 3 to 11 led to a decrease in the adsorption amount of phosphate from 51.53 to 42.43 mg/g. The influence of competitive anions on the phosphate adsorption was as follows: HCO3 – > SO4 2– > NO3 – . Attempts to reutilize the 700-ATP with deionized water were not successful. Phosphorus fractionation experimentation showed that most of the phosphate in 700-ATP was present in residual form. Phosphorus was strongly adsorbed onto 700-ATP. This study demonstrated that thermal treatment is a simple but effective way to improve the phosphorus removal efficiency of attapulgite and 700-ATP is a low-cost, natural, and abundant material for the removal of phosphate from aqueous solution.
ISSN
1944-3986
Language
eng
URI
https://aurora.ajou.ac.kr/handle/2018.oak/30460
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85056526674&origin=inward
DOI
https://doi.org/2-s2.0-85056526674
Journal URL
http://www.engineeringletters.com/issues_v26/issue_4/EL_26_4_16.pdf
Type
Article
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Lee, Chang-Gu  Image
Lee, Chang-Gu 이창구
Department of Environmental and Safety Engineering
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