Removal of As(V) from aqueous solutions by iron coated rice husk

Basit Öğe Kaydı
dc.contributor.authorPehlivan, E.
dc.contributor.authorTran, T. H.
dc.contributor.authorOuedraogo, W. K. I.
dc.contributor.authorSchmidt, C.
dc.contributor.authorZachmann, D.
dc.contributor.authorBahadir, M.
dc.date.accessioned2020-03-26T18:43:10Z
dc.date.available2020-03-26T18:43:10Z
dc.date.issued2013
dc.departmentSelçuk Üniversitesien_US
dc.description.abstractA lignocellulosic material extracted from rice husk (Oryza sativa), Vietnam, was modified as a new adsorbent for the removal of As(V) ions from aqueous solution. Iron was coated onto this adsorbent by hydrolization of ferric nitrate while adding an alkaline solution drop wise into the batch type reactor. The adsorption of As(V) ions from aqueous solution on coated rice husk was then studied at varying pH, As(V) concentrations, contact times, ionic strength, and adsorbent amounts. The minimum contact time to reach equilibrium is about 6 h. The adsorption of As(V) anions on the coated rice husk was found to be highly pH dependent due to Coulomb interactions between As(V) species in solution and positively charged surface groups RH-FeOOH, as well as formation of chelate complexes with naturally occurring carboxyl and carbonyl functional groups in the matrix. As(V) adsorption on Fe(III)-coated rice husk (RH-FeOOH) from aqueous solution was studied in the pH range 2-10. The main effects of pH on adsorption are estimated by considering both the behavior of As(V) ions (hydrolysis and hydroxide precipitation) and the effect of pH on coordination. A strong effect of pH was demonstrated at pH 4.0 with a maximum percentage for removal of As(V) ions 94%. Although both Langmuir and Freundlich isotherms have been used to characterize the adsorption of As(V), the Langmuir model fitted the equilibrium data better than Freundlich model and confirmed the surface homogeneity of adsorbent. The maximum adsorption capacity is determined as 2.5 mg/g of adsorbent at pH 4.0 for the Fe(III)-coated rice husk. It is concluded that initial As(V) concentration has an effect on the removal efficiency of RH-FeOOH. Higher adsorption of As(V) was observed at lower initial concentrations. RH-FeOOH as a low cost material is effective for the removal of As(V) ions and may become a valuable adsorbent to improve the ground water quality in Vietnam. (C) 2012 Elsevier B.V. All rights reserved.en_US
dc.description.sponsorshipGerman Federal Ministry for Economic Cooperation and Development (BMZ); German Academic Exchange Service (DAAD)Deutscher Akademischer Austausch Dienst (DAAD)en_US
dc.description.sponsorshipThis investigation was performed at the Guest Chair within the project "Exceed - Excellence Center for Development Cooperation Sustainable Water Management in Developing Countries" at the Technische Universitaet Braunschweig, Prof. Pehlivan being the visiting professor, and Ms. Hien and Mr. Ouedraogo being the international exchange staff members. The Exceed Project is granted by the German Federal Ministry for Economic Cooperation and Development (BMZ) and German Academic Exchange Service (DAAD), and their financial support we gratefully acknowledge.en_US
dc.identifier.doi10.1016/j.fuproc.2012.09.021en_US
dc.identifier.endpage517en_US
dc.identifier.issn0378-3820en_US
dc.identifier.issn1873-7188en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage511en_US
dc.identifier.urihttps://dx.doi.org/10.1016/j.fuproc.2012.09.021
dc.identifier.urihttps://hdl.handle.net/20.500.12395/29781
dc.identifier.volume106en_US
dc.identifier.wosWOS:000314191800067en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherELSEVIERen_US
dc.relation.ispartofFUEL PROCESSING TECHNOLOGYen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.selcuk20240510_oaigen_US
dc.subjectAdsorptionen_US
dc.subjectRice husken_US
dc.subjectAs(V)en_US
dc.subjectFe(III)en_US
dc.subjectIsothermsen_US
dc.titleRemoval of As(V) from aqueous solutions by iron coated rice husken_US
dc.typeArticleen_US

Dosyalar

Koleksiyon

WoS İndeksli Yayınlar Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu