Možnosti uporabe zeolitov za fiksiranje kovinskih ionov v sedimentih

diplomsko delo visokošolskega strokovnega študijskega programa I. stopnje

Sara Grm (Author), Marjana Simonič (Mentor), Andrej Horvat (Mentor)

Abstract

Namen diplomske naloge je bila študija možnosti uporabe zeolitov za fiksiranje Cr(VI), Zn(II) in Pb(II) ionov v kontaminiranih sedimentih. Za fiksacijo navedenih kovinskih ionov smo uporabili mešanico sintetičnih zeolitov 13X in 4A, v razmerju 1:1. Sedimente za študijo fiksacije Cr(VI) ionov smo vzorčili v bližini Zreč, za Zn(II) in Pb(II) ione pa smo sedimenti vzorčili iz reke Drave. V določeno maso sedimentov smo v razmerju 100:1 in 10:1 dodali zeolite. Vzorčenim sedimentom smo pred začetkom izvajanja meritev tudi določili vlažnost s postopkom žarjenja in smo se odločili, da bomo v njih tudi opazovali fiksacijo Cr(VI) ionov. Tako pripravljene vzorce smo hranili v temnem prostoru, da smo se čim bolj približali pogojem, v katerih se sediment nahaja v naravi. Preučevali smo uspešnost fiksacije pri različnih temperaturah in pH vrednostih. Vsebnost kovinskih ionov smo merili v času 3 mesecev. Celotno vsebnost kovinskih ionov v vzorčenih sedimentih smo določili z EDTA. Po zaključenem eksperimentu smo ugotovili, da je zeolit učinkovito sredstvo za fiksiranje Cr(VI), Zn(II) in Pb(II) ionov v sedimentih. Fiksacija Cr(VI) ionov je bila najboljša pri vzorcu hranjenem pri sobni temperaturi in nevtralnem pH z uporabo razmerja 10:1 dodanih zeolitov. Fiksacija Zn(II) ionov je bila najboljša pri sedimentih hranjenih pri 4 °C pri bazičnem pH, z uporabo razmerja 100:1 dodanih zeolitov. Fiksacija Pb(II) ionov je pri vseh preučevanih vzorcih bila enaka, saj smo vsem vzorcem izmerili vsebnost Pb(II) ionov pod mejno vrednostjo.

Keywords

zeolit;fiksacija;težke kovine;sediment;diplomske naloge;

Data

Language:	Slovenian
Year of publishing:	2023
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[S. Grm]
UDC:	549.67:666.123.4(043.2)
COBISS:	166988291
Views:	51
Downloads:	5
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Study of the possible zeolite application for fixation of metal ions in sediments
Secondary abstract:	The aim of this thesis was to study the possibility of using zeolites for the fixation of Cr(VI), Zn(II) and Pb(II) ions in contaminated sediments. A mixture of synthetic zeolites 13X and 4A, in a 1:1 ratio, was used for the fixation of these metal ions. Sediments for the Cr(VI) ion fixation study were sampled in the vicinity of Zreče, while for Zn(II) and Pb(II) ions sediments were sampled from the Drava river. Zeolites were added to the sediments in the ratio 100:1 and 10:1. The sampled sediments were also subjected to a moisture determination by an annealing process before the measurements were carried out and we also decided to observe the fixation of Cr(VI) ions in them. The samples prepared in this way were kept in a dark room to resemble as closely as possible the conditions in which the sediment is found in nature. The fixation efficiency was studied at different temperatures and pH values. The metal ion content was measured over a period of 3 months. The total metal ion content of the sampled sediments was determined by EDTA. After the experiment was concluded, it was found that zeolite is an effective agent for fixation of Cr(VI), Zn(II) and Pb(II) ions in sediments. The fixation of Cr(VI) ions was best in samples, stored at room temperature and neutral pH using a 10:1 ratio of added zeolites. The fixation of Zn(II) ions was best in sediments stored at 4 °C at basic pH, using a 100:1 ratio of added zeolites. The fixation of Pb(II) ions was the same for all the treated samples, as all the samples were measured to contain Pb(II) ions below the limit value.
Secondary keywords:	zeolite;fixation;heavy metals;sediment;
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo, kemijska tehnologija
Pages:	1 spletni vir (1 datoteka PDF ( XI, 31 f.))
ID:	19759784