20.500.12556/RUL-188864 Uporaba ligandov na osnovi tiosečnine pri raztapljanju zlata v organskih topilih Use of thiourea-based ligands in the dissolution of gold in organic solvents Razvila sem enostaven, cenovno ugoden in okolju prijazen postopek recikliranja zlata iz odpadnih elektronskih naprav, ki temelji na načelih katalize. Kot ligand za raztapljanje zlata sem preizkusila različne komercialno dostopne in, v sklopu tega dela, sintetizirane ligande z žveplovimi funkcionalnimi skupinami na osnovi tiosečnine ter spojine na osnovi selena, ki bi delovale kot katalizator. Kot ligand je bil najprimernejši 2-merkaptobenzimidazol, ki se je v te namene že uporabljal, kot katalizator pa organski diselenidi. Kot topilo sem uporabila etanol, kot »zelen« oksidant pa vodikov peroksid. Po raztapljanju, sem izvedla redukcijo zlata do elementarnega stanja z natrijevim tiosulfatom, ter reciklirala del liganda, 2-merkaptobenzimidazola. Postopek sem izvedla na realnih vzorcih, t.i. »zlatih prstih« na tiskanih vezjih. Raztopine, oborine in izolirane produkte celotnega procesa sem analizirala z različnimi metodami karakterizacije (NMR, HRMS, CHN elementna analiza, IR, AES, SEM-EDS). I developed a simple, cost-effective, and environmentally friendly procedure for recycling gold from waste electrical and electronic equipment, based on the principles of catalysis. As a ligand for dissolving gold, I evaluated various commercially available ligands and, as part of this work, synthesized ligands with sulfur functional groups based on thiourea, as well as selenium-based compounds that could act as catalysts. The most suitable ligand was 2-mercaptobenzimidazole, which has been previously used for this purpose, while diselenides served as the catalyst. I used ethanol as the solvent and hydrogen peroxide as a green oxidant. After dissolution, I conducted the reduction of gold to its elemental state using sodium thiosulfate and recycled part of the ligand, 2-mercaptobenzimidazole. I performed the process on real samples, namely gold fingers from printed circuit boards. The solutions, precipitates, and isolated products of the entire process were analyzed using various characterization methods (NMR, HRMS, CHN elemental analysis, IR, AES, SEM-EDS). zlato recikliranje kataliza diselenid raztapljanje gold recycling catalysis diselenide dissolution true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-09-29 13:50:01 2026-09-29 13:50:06 2026-09-30 04:29:23 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 25383 Cizerl_Ana_-_Uporaba_ligandov_na_osnovi_tiosecnine_pri_raztapljanju_zlata_v_organskih_topilih.pdf Cizerl_Ana_-_Uporaba_ligandov_na_osnovi_tiosecnine_pri_raztapljanju_zlata_v_organskih_topilih.pdf 1 A63FD856EDE431DABCABBCFFA83988AE 9995583dd452acb432e77d5b8cba8747d71257fb2469f69a11a23af7fa000f14 d0d92ad9-bbfb-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=249238 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0