magistrsko delo
Vesna Masten Gubeljak (Author), Aleksandra Lobnik (Mentor)

Abstract

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).

Keywords

adsorpcija;krom;svinec;magnetni nanodelci;SiO2 funkcionalizirani nanodelci;odstranjevanje težkih kovin;odpadne vode;sol-gel sinteza;magistrska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: [V. Masten Gubeljak]
UDC: 628.316.12:66.081.312(043.2)
COBISS: 19934998 Link will open in a new window
Views: 1305
Downloads: 184
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Other data

Secondary language: English
Secondary title: Removal of lead and chromium ions from aqueous solutions by adsorption on nanoparticles
Secondary abstract: 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
Secondary keywords: adsorption;chromium ions;lead ions;heavy metal removal;funktional magnetic nanoparticles;funktional nanoparticles SiO2;sol-gel synthesis;waste water;
URN: URN:SI:UM:
Type (COBISS): Master's thesis
Thesis comment: Univ. v Mariboru, Fak. za strojništvo
Pages: XIV, 114 f.
ID: 9156582