Ezzel az azonosítóval hivatkozhat erre a dokumentumra forrásmegjelölésben vagy hiperhivatkozás esetén: https://dspace.kmf.uz.ua/jspui/handle/123456789/3439
Cím: Comparative study of Ni(II) adsorption by pristine and oxidized multi-walled N-doped carbon nanotubes
Szerző(k): Balog Renáta
Балог Рената
Maryna Manilo
Маніло Марина
Laszlo Vanyorek
Vanyorek László
Choma Zoltan
Csoma Zoltán
Чома Золтан
Sandor Barany
Bárány Sándor
Баран Олександр
Kulcsszavak: N-doped multi-walled carbon nanotubes;adsorption
Kiadás dátuma: 2020
Típus: dc.type.collaborative
Hivatkozás: In RSC Advances. 2020. Issue 10. pp. 3184-3191.
Sorozat neve/Száma.: ;Issue 10.
Absztrakt: Abstract. The principles and mechanisms of adsorption of Ni(II) ions by well characterized pristine and oxidized Ndoped multi-walled carbon nanotubes (N-CNTs) are described and discussed. The samples were synthesized by CCVD method using n-butylamine as the carbon source and Ni(NO3)2 + MgO as the catalyst and purified by treatment with HCl. The surface functionalization was performed using oxidation with a mixture of concentrated H2SO4 and HNO3. The morphology, nature and charge of surface groups were characterized by HRTEM, XPS, FTIR and micro-electrophoresis methods. It has been shown that: adsorption of Ni(II) reaches an equilibrium value within 20–30 min; the degree of extraction of nickel ions from the solution increases with its dilution; adsorption of Ni(II) results in an insufficient decrease in the suspension pH for pristine N-CNTs (0.5–0.6 pH unit) and considerable lowering of the pH for the oxidized sample (up to 2.5 pH unit); the adsorption isotherms are described by the Langmuir equation; the plateau amounts of adsorption (35–40 mg g 1 ) are almost the same for both as-prepared and oxidized samples; at pH 8 and higher a sharp increase in adsorption is observed which is caused by nickel hydroxide precipitation. The spectroscopic, adsorption, electrophoretic and pH measurement data testify that below pH 8 the major mechanism of adsorption by as-prepared N-CNTs is the donor– acceptor interaction between the free electron pair of N atoms incorporated into the nanotube lattice and vacant d-orbital of the adsorbing Ni(II) ions. For the oxidized N-CNTs ion-exchange processes with a release of H+ play a decisive role.
Leírás: Contents: https://pubs.rsc.org/en/journals/journalissues/ra#!issueid=ra010006&type=current&issnonline=2046-2069
Editorial board: https://www.rsc.org/journals-books-databases/about-journals/rsc-advances/#boards-staff
URI: https://dspace.kmf.uz.ua/jspui/handle/123456789/3439
ISSN: 2046-2069 (Online)
metadata.dc.rights.uri: http://creativecommons.org/licenses/by-nc-nd/3.0/us/
Ebben a gyűjteményben:Csoma Zoltán

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