https://phaidrabg.bg.ac.rs/o:13390 cobiss:48268047 thesis:3988 srp 2016 OSNO - Opšta sistematizacija naučnih oblasti, Hemijsko inženjerstvo OSNO - Opšta sistematizacija naučnih oblasti, Hemijsko inženjerstvo OSNO - Opšta sistematizacija naučnih oblasti, Neorganska hemija OSNO - Opšta sistematizacija naučnih oblasti, Neorganska hemija zeoliti, teški metali, otpadne vode, kinetika, adsorpcija, jonska izmena, kinetički modeli, regeneracija zeolita, fluidizovan slo zeolites, heavy metal ions, wastewater, kinetics, adsorption, ion-exchange, kinetic model, zeolite regeneration, fluidized bed http://creativecommons.org/licenses/by-nc-nd/2.0/at/legalcode Obradović, Bojana. 1966- Rajić, Nevenka, 1959- Nikačević, Nikola Damjanović, Ljiljana, 1971- info:eu-repo/semantics/bachelorThesis Jovanović, Mina B. 1983- Uklanjanje jona metala iz vodenih rastvora korišćenjem zeolita:mehanizam, kinetika i primena u fluidizovanom sloju Zagađenje prirodnih voda jonima teških metala predstavlja rastuću opasnost za čoveka i životnu sredinu. Postupci koji se koriste u tretmanima otpadnih voda praćeni su velikim investicionim i operativnim troškovima, kao i troškovima odlaganja iskorišćenog materijala nakon obrade. Jedno od rešenja predstavlja primenu adsorpcije uz korišćenje adsorbenata niske cene među kojima se izdvaja prirodni zeolit koji je mineralni resurs Srbije. Cilj istraživanja u ovoj doktorskoj disertaciji je bio razvoj procesa uklanjanja jona teških metala iz otpadnih voda korišćenjem zeolita. Izabrani su prirodni zeolitklinoptilolit iz ležišta Zlatokop u Vranjskoj Banji koje se smatra najvećim u Evropi, i zeolit A koji je komercijalno najdostupniji sintetički zeolit. U eksperimentima je ispitano uklanjanje dvovalentnih katjona Cu(II), Mn(II), Zn(II), Ni(II) i Pb(II) iz vodenih rastvora korišćenjem prirodnog zeolita u vidu praha i sintetičkog zeolita 4A u vidu kuglica. Eksperimentalna ispitivanja su obuhvatila određivanje adsorpcionih kapaciteta zeolita, ravnotežnih parametara, mehanizma i kinetike procesa, potrebnog vremena kontakta zeolita i rastvora za postizanje ravnoteže, kao i afiniteta prirodnog zeolita u pogledu uklanjanja različitih katjona. U cilju primene u pilot-postrojenju i industriji u procesima prečišćavanja otpadnih voda, u ovom radu je ispitana i mogućnost primene fluidizovanog sloja kuglica zeolita A za uklanjanje Cu(II) i Mn(II) iz vodenih rastvora. Heavy metals present one of the major environmental pollutants hazardous also to human health. Current wastewater treatment processes are burdened with high investment and operational costs as well as the expenses for disposal of the used materials. One of the solutions is application of adsorption processes with the use of low cost adsorbents among which natural zeolites are attractive candidates, especially taking into account the fact that Serbia has large depositions of these minerals. The aim of this doctoral dissertation was development of processes for removal of heavy metal ions from wastewater using zeolites. Natural clinoptilolite-rich zeolitic tuff from the region of Vranjska Banja (Serbia), which is considered the largest deposit in Europe, was chosen as a low-cost zeolite, while zeolite A was selected as a commercially available synthetic zeolite. Removal of divalent heavy metal ions, Cu(II), Mn(II), Zn(II), Ni(II) and Pb(II), from aqueous solutions was experimentally investigated by using natural zeolite in the form of powder and beads of synthetic zeolite A. The investigation included determination of the adsorption capacity of the zeolite, equilibrium parameters, mechanism and kinetics of the adsorption process, required contact time of zeolite and solution to achieve the equilibrium, and the affinity of the natural zeolite with respect to the investigated cations. In order to assess design parameters for a large-scale process of wastewater treatment, potentials for the use of fluidized bed systems with zeolite A beads were investigated for removal of Cu(II) and Mn(II) from aqueous solutions. It was found that the contact time of the solution and zeolite required to achieve equilibrium was between 24 – 48 h. The maximal adsorption capacities of natural zeoliteclinoptilolite converted to the Na-rich form and zeolite A beads for Cu(II) were determined as 0.27 mmol g-1 and 0.34 mmol g-1, respectively, (i.e. 17.1 mg g-1 and 21.6 mg g-1). It was also shown that the affinity of the natural zeolite followed the order: Pb(II) > Cu(II) > Zn(II) > Mn(II) > Ni(II)... Hemijsko inženjerstvo i neorganska hemija/ Chemical engineering and inorganic chemistry Datum odbrane: 12.07.2016. viii, 211 listova 7787589 bytes