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2017, vol. 58, br. 4, str. 530-540
Sorpcija nitrata pomoću modifikovane biomase Lagenaria vulgaris - kinetička i ravnotežna ispitivanja
aVisoka tehnološko umetnička strukovna škola, Leskovac
bUniverzitet u Nišu, Tehnološki fakultet, Leskovac

e-adresagoranchem_yu@yahoo.com
Projekat:
Razvoj i karakterizacija novog biosorbenta za prečišćavanje prirodnih i otpadnih voda (MPNTR - 34008)
Biljni i sintetički bioaktivni proizvodi novije generacije (MPNTR - 34012)

Sažetak
U cilju prevencije pojave eutrofikacije analizirana je efikasnost novog alternativnog sorbenta na bazi hemijski modifikovane kore Lagenaria vulgaris za uklanjanje nitrata iz vodenih rastvora. Sorpcioni eksperimenti su vršeni iz vodenih rastvora različitih početnih koncentracija nitrata (2 - 100 mg N dm-3), sa dozom sorbenta od 2 g dm-3, pri optimalno utvrđenim uslovima. Za predviđanje mehanizma sorpcije nitrata i procenu karakterističnih sorpcionih parametara primenjena su kinetička i ravnotežna ispitivanja. Modelovanje eksperimentalno dobijenih rezultata u ravnoteži vršeno je pomoću sorpcionih izotermi, tipičnih za definisanje ravnoteže sorpcije u sistemu tečno-čvrsto (Langmuir-ova, Freundlich-ova i Temkin-ova izoterma). Najbolje slaganje podataka postignuto je pomoću Langmuir-ovog modela (R2 = 0,994), koji predviđa maksimalni sorpcioni kapacitet sorbenta od 16,67 mg N g-1. Za kinetička ispitivanja procesa sorpcije primenjeni su Lagergren-ov model pseudo-prvog reda, Ho-ov model pseudo-drugog reda i Weber-Morris-ov model unutarčestične difuzije. Proces sorpcije nitrata pomoću modifikovane biomase Lagenaria vulgaris najbolje opisuje kinetički model pseudo-drugog reda. Multilinearan Weber-Morris-ov model sugeriše da mehanizam površinske fizisorpcije, pored unutarčestične difuzije, kontroliše ukupnu brzinu procesa.
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O članku

jezik rada: srpski
vrsta rada: naučni članak
DOI: 10.5937/ZasMat1704530M
objavljen u SCIndeksu: 08.01.2018.
Creative Commons License 4.0

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