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Removal of fluoride from aqueous media by Fe3O4@Al(OH)3 magnetic nanoparticles.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; State Environmental Protection Key Laboratory for Lake Pollution Control, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China .
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China .
State Environmental Protection Key Laboratory for Lake Pollution Control, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China .
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China .ORCID iD: 0000-0002-5729-1908
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2010 (English)In: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 173, no 1-3, 102-109 p.Article in journal (Refereed) Published
Abstract [en]

A novel magnetic nanosized adsorbent using hydrous aluminum oxide embedded with Fe(3)O(4) nanoparticle (Fe(3)O(4)@Al(OH)(3) NPs), was prepared and applied to remove excessive fluoride from aqueous solution. This adsorbent combines the advantages of magnetic nanoparticle and hydrous aluminum oxide floc with magnetic separability and high affinity toward fluoride, which provides distinctive merits including easy preparation, high adsorption capacity, easy isolation from sample solutions by the application of an external magnetic field. The adsorption capacity calculated by Langmuir equation was 88.48 mg g(-1) at pH 6.5. Main factors affecting the removal of fluoride, such as solution pH, temperature, adsorption time, initial fluoride concentration and co-existing anions were investigated. The adsorption capacity increased with temperature and the kinetics followed a pseudo-second-order rate equation. The enthalpy change (Delta H(0)) and entropy change (DeltaS(0)) was 6.836 kJ mol(-1) and 41.65 J mol(-1)K(-1), which substantiates the endothermic and spontaneous nature of the fluoride adsorption process. Furthermore, the residual concentration of fluoride using Fe(3)O(4)@Al(OH)(3) NPs as adsorbent could reach 0.3 mg L(-1) with an initial concentration of 20 mg L(-1), which met the standard of World Health Organization (WHO) norms for drinking water quality. All of the results suggested that the Fe(3)O(4)@Al(OH)(3) NPs with strong and specific affinity to fluoride could be excellent adsorbents for fluoride contaminated water treatment.

Place, publisher, year, edition, pages
2010. Vol. 173, no 1-3, 102-109 p.
Keyword [en]
Fluoride; Hydrous aluminum oxide; Magnetic nanosized adsorbent
National Category
Analytical Chemistry
Identifiers
URN: urn:nbn:se:oru:diva-38459DOI: 10.1016/j.jhazmat.2009.08.054ISI: 000273135600013PubMedID: 19747775Scopus ID: 2-s2.0-71749090773OAI: oai:DiVA.org:oru-38459DiVA: diva2:764974
Note

Sponsors:

National Natural Science Foundation of China  Grant no: 20621703 

State High Technology Development Plan  Grant no: 2007AA06A407 

National Basic Research Program (973) of China  Grant no: 2008CB418200 

Available from: 2014-11-21 Created: 2014-11-07 Last updated: 2015-06-05Bibliographically approved

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