20.500.12556/DKUM-61071 Odstranjevanje svinčevih in kromovih ionov iz vodnih raztopin s pomočjo adsorpcije na nanodelce Removal of lead and chromium ions from aqueous solutions by adsorption on nanoparticles V magistrskem delu so bili sintetizirani nanodelci po Stöberjevi sol-gel metodi v alkoholnem mediju in amonijakom kot katalizatorjem, pri pH 10-11 in množinskem razmerju prekurzorjev TEOS:APTMS za 1:2 in 1:4. Za karakterizacijo materialov smo uporabili BET metodo za določanje specifične površine, infrardečo spektroskopijo s Fourierjevo transformacijo (FTIR) za določevanje funkcionalnih skupin, rentgensko praškovno difrakcijo (XRD) in presevno elektronsko mikroskopijo (TEM) ter za analizo učinkovitosti odstranjevanja svinčevih ionov (Pb2+) in skupnega kroma (skupni Cr) z AAS metodo. Adsorpcija svinca (Pb2+) in skupnega Cr na funkcionalizirane nanodelce (SiO2@NH2) in funkcionalizirane magnetne nanodelce (MND@SiO2@NH2) se je pokazala kot uspešna metoda za odstranjevanje ionov težkih kovin iz odpadnih voda. Pri velikosti MND@SiO2@NH2 delcev od 9 – 16 nm z debelino prevleke od 2- 5 nm smo odstranili od 95 % do 99 % Pb2+, Cr6+ in skupnega Cr iz modelnih voda. Z R (%) > 95 se sintetizirani material izkazal kot zelo učinkovit tudi pri odstranjevanju Pb2+ in skupnega Cr iz modelne mešanice ionov težkih kovin. Visoko učinkovitost omogoča velika specifična površina delcev in površinska funkcionalizacija z amino skupinami (-NH2). The nanoparticles used, were synthesised via Stober's sol-gel method in an alcoholic medium and using ammonia as a catalyst at a pH of 10-11 and the relative abundances of the precursors TEOS:APTMS of 1:2 and 1:4. For characterisation of the prepared material the BET method was used in order to estimated the specific surface area. Additional methods such as Fourier Transform Infrared Spectroscopy (FTIR), X-Ray powder diffraction (XRD) and Transmission Electron Microscopy (TEM). For efficiency analysis of heavy metal ion removal (Pb2+ and Cr total), analysis with AAS spectroscopy were performed. Results show that lead and chrome absorption on functionalised silica nanoparticles (SiO2@NH2) and functionalised magnetic nanoparticles (MNP@SiO2@NH2) is a succesful method of heavy metal ion removal from wastewater. . In the case of MNP@SiO2@NH2 with particle size from 9 to 16 nm with a coating thickness of 2 to 5 nm, between 95 to 99 % of Pb, Cr6+ and total Cr species were removed from model samples. With R values of 99 % for Pb2+ and 96 % for total Cr the synthesised material is very effective at removing Pb2+ and total Cr from a model mixture of heavy metal ions. This is due to the large specific area of the particles and the functionalisation of the surface with amino (-NH2) groups adsorpcija krom magnetni nanodelci nanodelci SiO2 odstranjevanje težkih kovin odpadne vode sol-gel sinteza svinec adsorption chromium ions heavy metal removal lead ions magnetic nanoparticles SiO2 nanoparticles sol-gel synthesis waste water true true false [V. Masten Gubeljak] Slovenski jezik Angleški jezik Magistrsko delo 2016-07-19 19:35:51 2016-09-05 12:44:04 2022-06-25 03:07:31 2019-07-11 12:07:50 2016 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 628.316.12:66.081.312(043.2) 19934998 URN:SI:UM:DK:L7YMPZBU MAG_Masten_Gubeljak_Vesna_2016.pdf MAG_Masten_Gubeljak_Vesna_2016.pdf 1 993D1C1807172C642942BF0AC0DE612A 1599060eaa19d7c902fcd722c4a7f2ba538bf25c703f48c1100e080b070de0eb 3f1ceb63-7c0d-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=101653 Fakulteta za strojništvo 0 0 0