Prikaz osnovnih podataka o dokumentu
Study of the iron(III)-modified clinoptilolite in the adsorption of phosphate from aqueous medium: mechanism and kinetics
dc.creator | Kaplanec, Iva | |
dc.creator | Recnik, Aleksander | |
dc.creator | Mali, Gregor | |
dc.creator | Rajić, Nevenka | |
dc.date.accessioned | 2021-03-10T13:23:38Z | |
dc.date.available | 2021-03-10T13:23:38Z | |
dc.date.issued | 2017 | |
dc.identifier.issn | 1944-3994 | |
dc.identifier.uri | http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3581 | |
dc.description.abstract | Clinoptilolite-rich tuff (Z) enriched with Fe(III) was studied in the removal of phosphate ions present in aqueous medium at pH = 6.5. Fe(III) modification was performed by a simple wet impregnation giving the product (FeZ) with about 18 wt% Fe. Transmission electron microscopy showed the presence of a flaky Fe(III) amorphous precipitate on the clinoptilolite sheets and a preserved clinoptilolite crystallinity. The modification increased the specific surface area from 28.6 to 140.3 m(2) g(-1). FeZ effectively adsorbed phosphate, the removal rate at 298 K varying from 86% to 42.5% (for C-0 = 50 mg dm(-3) and C-0 = 400 mg dm(-3)). The sorption isotherms were in accord with the Langmuir model, giving for the Langmuir constant (R-L) values in the range 0-1 that are characteristic of a favourable adsorption. The data for adsorption kinetics were best described by the pseudo-second-order model suggesting chemisorption as the phosphate sorption mechanism. Intra-particle diffusion was present in the adsorption, but it was not the rate-limiting step. A P-31 static spin-echo mapping nuclear magnetic resonance (NMR) measurement was performed for studying the phosphate-FeZ interaction. The results showed that the phosphate adsorption on FeZ proceeds through electrostatic interactions and covalent bonding, the latter being more pronounced. | en |
dc.publisher | Desalination Publ, Hopkinton | |
dc.relation | info:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172018/RS// | |
dc.rights | restrictedAccess | |
dc.source | Desalination and Water Treatment | |
dc.subject | Clinoptilolite | en |
dc.subject | Phosphate adsorption | en |
dc.subject | Adsorption mechanism | en |
dc.subject | P-31 NMR | en |
dc.subject | Kinetics | en |
dc.subject | TEM | en |
dc.title | Study of the iron(III)-modified clinoptilolite in the adsorption of phosphate from aqueous medium: mechanism and kinetics | en |
dc.type | article | |
dc.rights.license | ARR | |
dc.citation.epage | 240 | |
dc.citation.other | 78: 231-240 | |
dc.citation.rank | M22 | |
dc.citation.spage | 231 | |
dc.citation.volume | 78 | |
dc.identifier.doi | 10.5004/dwt.2017.20875 | |
dc.identifier.scopus | 2-s2.0-85025810628 | |
dc.identifier.wos | 000408475200023 | |
dc.type.version | publishedVersion |