20.500.12556/DKUM-54211 Študija adsorpcije amonijevih ionov na zeolite Study of adsorption of ammonium ions on zeolites Diplomsko delo prikazuje študijo adsorpcije amonijevih ionov iz modelnih raztopin in vzorcev pitne vode iz Mariborskega vodovoda na tri različne adsorbente: zeolit klinoptilolit z granulami velikosti od 1 mm do 2 mm, zeolit klinoptilolit velikosti granul od 2 mm do 4 mm iz regije Krapina na Hrvaškem in zeleni pesek. Da bi ugotovili učinkovitost preučevanih adsorbentov, smo spreminjali njihovo maso od 0,25 g do 1 g, vpliv motečih ionov v vzorcih pitne vode na adsorpcijo amonijevih ionov pa preverjali s spreminjanjem začetne koncentracije amonijevih ionov pri 25 °C. Optimalna vrednost pH za adsorpcijo amonijevih ionov na preučevane adsorbente je 8, kar smo dosegli brez dodatka kisline ali baze. Preučili smo tudi zmožnost regeneracije najučinkovitejšega adsorbenta. Ugotovili smo, da se adsorpcija amonijevih ionov na zeolit klinoptilolit z večanjem velikosti granul znižuje. Rezultati eksperimentalnega dela kažejo, da ima prisotnost drugih ionov v vzorcih pitne vode največji vpliv na učinkovitost ionske izmenjave pri zelenem pesku, v manjši meri pa vpliva na adsorpcijo amonijevih ionov na naravni zeolit klinoptilolit. Iz rezultatov je razvidno, da ima z NaCl regenerirani zeolit klinoptilolit (1 mm – 2 mm) višjo izmenjevalno kapaciteto kot pred regeneracijo. Po drugi regeneraciji smo v 120 minutah z 1 g klinoptilolita (1 mm – 2 mm) odstranili 100 % amonijevih ionov. Ravnotežne eksperimentalne podatke za zeleni pesek smo analizirali z uporabo Freundlichove in Langmuirjeve linearne adsorpcijske izoterme in ugotovili, da se bolje prilegajo Langmuirjevi izotermi. Dobljeni rezultati potrjujejo, da vsi trije preučevani adsorbenti predstavljajo potencialno alternativo za odstranjevanje amonijevih ionov v nizkih koncentracijah iz pitne vode. In this study, the adsorption of ammonium ions from aqueous solution and drinking water samples from Mariborski vodovod on three different adsorbents was investigated: the zeolite clinoptilolite with particle size from 1 mm to 2 mm, the zeolite clinoptilolite with particle size from 2 mm to 4 mm from the Krapina region, Croatia, and the greensand. In order to study the efficiencies of these adsorbents, their masses were changed from 0,25 g to 1 g. The influences of the other ions in drinking water samples upon exchange of ammonium ions were tested by changing the initial concentrations of ammonium ions at 25 °C. The optimum pH value for adsorption of ammonium ions was determined as 8, which was achived without adding any acid or base. The regeneration of the most efficient adsorbent was also studied. From the obtained results it can be concluded that the ammonium ions adsorption decreases with the increasing particle size of natural zeolite clinoptilolite. The present work showed that the exchange of ammonium ions in drinking water samples was the most lower by greensand, the ion exchange on natural zeolite clinoptilolite was less affected. The results indicated that cation exchange capacity of natural zeolite clinoptilolite (1 mm - 2 mm) increased after regeneration with NaCl. After 120 min of second regeneration 100 % adsorption of ammonium ions on 1 g of clinoptilolite (1 mm - 2 mm) was achieved. Equilibrium data for greensand were fitted by Freundlich and Langmuir isotherm. Langmuir isotherm fitted better the experimental data. From the present work it can be concluded that all three adsorbents can be used effectively for ammonium removal from drinking water with low initial concentration of ammonium ions. adsorpcija adsorpcijske izoterme ionska izmenjava amonijevi ioni naravni zeoliti zeleni pesek čiščenje vode adsorption adsorption isotherm ion exchange ammonium ions natural zeolites greensand water purification true true false [V. Furlan] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2015-08-25 17:38:33 2015-10-30 10:46:25 2022-06-05 03:05:20 2021-05-10 03:25:13 2015 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 628.16(043.2) 19437334 URN:SI:UM:DK:96W6JDT1 UN_Furlan_Veronika_2015.pdf UN_Furlan_Veronika_2015.pdf 1 BD8C1F7225FB6863B53BBA416ED7FFCC 01eb6dbb7ef68abdecf71998f59eb0a77e1816794ea21a5188401db543b376c8 8ff43963-7c07-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=80510 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0