20.500.12556/DKUM-45271 ODSTRANJEVANJE ARZENA IN KROMA IZ VODE Z MAGHEMITNIMI NANOSTRUKTURAMI REMOVAL OF ARSENIC AND CHROMIUM FROM WATER BY MAGHEMITE NANOSHEETS Namen diplomskega dela je bil s topotaktično transformacijo lepidokrokita sintetizirati dvodimenzionalne magnetne maghemitne nanostrukture, jih okarakterizirati z XRD in BET metodo ter preučiti njihovo uporabo za adsorpcijo As(III) in Cr(VI) ionov iz vode. Pripravljene maghemitne nanostrukture smo suspendirali v vodi z znano koncentracijo As(III) in Cr(VI) ionov. S spreminjanjem različnih eksperimentalnih parametrov (mase adsorbenta, pH, časa, koncentracije As(III) in Cr(VI) ionov) smo ugotavljali učinkovitost maghemitnega nanoadsorbenta za odstranjevanje As(III) in Cr(VI) ionov iz vode. Rezultati kažejo, da smo uspešno sintetizirali maghemitne nanostrukture, katerih BET površina je 118,79 m2/g, volumen por 0,258 cm3/g in povprečni premer por 8,684 nm. Pripravljeni maghemitni nanoadsorbent ima zelo dobre adsorpcijske sposobnosti za odstranjevanje As(III) ionov, manj primeren je za odstranjevanje Cr(VI) ionov. Adsorpcija poteka hitro, pri optimalnih pogojih se ravnotežje vzpostavi že po 20 minutah in takrat je učinkovitost adsorpcije As(III) ionov najmanj 90 %. Zaradi magnetnih lastnosti adsorbenta je možna tudi njegova ponovna uporaba. The purpose of the diploma was the synthesis of two-dimensional magnetic maghemite nanostructures in the form of nanosheeets by topotactic transformation, characterization of nanosheets by XRD and BET method and the investigation of potential applications of maghemite nanosheets for adsorption of As(III) and Cr(VI) ions from water. Prepared maghemite nanosheets were suspended in water with a known concentration of As(III) and Cr(VI) ions. By changing various experimental parameters (time, weight of the adsorbent, pH, concentration of As(III) and Cr(VI) ions) we determine the effectiveness of maghemite nanosheests to remove As(III) and Cr(VI) ions from water. The results show that we have successfully synthesized maghemite nanoadsorbent with BET surface area 118.79 m2/g, a pore volume 0.258 cm3/g and an average pore diameter 8.684 nm. Prepared maghemite nanosheets have a very good adsorption capacity for removal of As (III) ions, but are less suitable for removal of Cr (VI) ions. Adsorption is fast and under optimal conditions the equilibrium is established after 20 minutes with adsorption efficiency at least 90 % for As(III) ions. It is also possible to reuse adsorbent, because of its magnetic properties. arzen krom maghemitne nanostrukture adsorpcija nanomateriali čiščenje vode arsenic chromium maghemite nanosheets adsorption nanomaterials water purification true true false [U. Jančič] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2014-08-20 17:20:30 2014-09-22 19:36:26 2022-05-15 03:06:42 2021-05-02 03:28:42 2014 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 628.161.3(043.2) 18219798 URN:SI:UM:DK:IJU7CSRE UNI_Jancic_Urska_2014.pdf UNI_Jancic_Urska_2014.pdf 1 B841B729EDDE5BC1B14A98D6DFE75352 f878e142598dd685223051fe0af6700d5891e34121c0fb651a4dbf452885f03e 36e65a21-7c0b-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=67110 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0