Removal of phosphate from aqueous solutions by adsorption onto Ca(OH)2 treated natural clinoptilolite

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dc.contributor.authorMitrogiannis, Dimitris
dc.contributor.authorPsychoyou, Maria
dc.contributor.authorBaziotis, Ioannis
dc.contributor.authorInglezakis, Vassilis J.
dc.contributor.authorKoukouzas, Nikolaos
dc.contributor.authorTsoukalas, Nikolaos
dc.contributor.authorPalles, Dimitrios
dc.contributor.authorKamitsos, Efstratios
dc.contributor.authorOikonomou, Georgios
dc.contributor.authorMarkou, Giorgos
dc.creatorDimitris, Mitrogiannis
dc.date.accessioned2018-01-04T10:56:47Z
dc.date.available2018-01-04T10:56:47Z
dc.date.issued2017-07-15
dc.description.abstractAbstract Phosphorus (P) recovery from wastewater is of great interest especially when the loaded adsorbent can be used in the agriculture as slow-release fertilizer. The application depends on environmental concerns related to the chemical modification of the adsorbent and the release of toxic compounds from the loaded material to the soil or the water during adsorption. The present work focused on the phosphate (PO4-P) removal from aqueous solutions under low P concentrations (0.5–10mg/L) by using Ca(OH)2-pretreated natural zeolite (CaT-Z). As activation agent, Ca(OH)2 presents benefits in terms of pretreatment costs and environmental impact of the applied adsorbent. The pretreatment of natural zeolite (clinoptilolite) with 0.25mol/L Ca(OH)2 led to an increase of P removal from 1.7 to 97.6% at initial P concentration of 10mg/L, pH 7 and 298K. Low residual concentrations of 81–238μg P/L were achieved at 298K rendering CaT-Z a promising sorbent for tertiary wastewater treatment. At 200mg P/L, the adsorption capacity was 7.57mg P/g CaT-Z. The P removal efficiency was pH-independent suggesting a beneficial use of CaT-Z under acidic and alkaline conditions. Adsorption was found to be an endothermic and slow process reaching equilibrium after 120h, whereas the half of the PO4-P was adsorbed in the first 8h. The applied kinetic models showed that both film and intraparticle diffusion contributed to phosphate removal. Phosphate sorption decreased in the presence of the anionic surfactant SDS, Fe2+, HCO3−, acetate and citrate anion. The predominant mechanisms of ligand exchange and Ca-P surface precipitation were confirmed by the IR-ATR and SEM-EDS analyses, respectively.en_US
dc.identifierDOI:10.1016/j.cej.2017.03.063
dc.identifier.citationDimitris Mitrogiannis, Maria Psychoyou, Ioannis Baziotis, Vassilis J. Inglezakis, Nikolaos Koukouzas, Nikolaos Tsoukalas, Dimitrios Palles, Efstratios Kamitsos, Georgios Oikonomou, Giorgos Markou, Removal of phosphate from aqueous solutions by adsorption onto Ca(OH)2 treated natural clinoptilolite, In Chemical Engineering Journal, Volume 320, 2017, Pages 510-522en_US
dc.identifier.issn13858947
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S138589471730390X
dc.identifier.urihttp://nur.nu.edu.kz/handle/123456789/3107
dc.language.isoenen_US
dc.publisherChemical Engineering Journalen_US
dc.relation.ispartofChemical Engineering Journal
dc.rights.license© 2017 Elsevier B.V. All rights reserved.
dc.subjectZeoliteen_US
dc.subjectPhosphate adsorptionen_US
dc.subjectLigand exchangeen_US
dc.subjectSurface precipitationen_US
dc.subjectDiffusionen_US
dc.subjectEutrophicationen_US
dc.titleRemoval of phosphate from aqueous solutions by adsorption onto Ca(OH)2 treated natural clinoptiloliteen_US
dc.typeArticleen_US
elsevier.aggregationtypeJournal
elsevier.coverdate2017-07-15
elsevier.coverdisplaydate15 July 2017
elsevier.endingpage522
elsevier.identifier.doi10.1016/j.cej.2017.03.063
elsevier.identifier.eid1-s2.0-S138589471730390X
elsevier.identifier.piiS1385-8947(17)30390-X
elsevier.identifier.scopusid85016058800
elsevier.openaccess0
elsevier.openaccessarticlefalse
elsevier.openarchivearticlefalse
elsevier.startingpage510
elsevier.teaserPhosphorus (P) recovery from wastewater is of great interest especially when the loaded adsorbent can be used in the agriculture as slow-release fertilizer. The application depends on environmental...
elsevier.volume320
workflow.import.sourcescience

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