Naslov
Testing of the selectivity of sulphur-impregnated zeolite towards Hg(II) ions

Autori
Ćaleta, Katarina ; Ugrina, Marin

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts of the 4th International Conference of Scientists, Professionals, and Students on the Topic of Environmental Protection in the Republic of Croatia / Sedlar, Jelena ; Alešković, Luka Marijan ; Nižić, Katarina ; Ćorić, Mislav - Split : Kemijsko-tehnološki fakultet u Splitu, 2023, 5-5

ISBN
978-953-7803-20-9

Skup
4th International Conference of Scientists, Professionals, and Students on the Topic of Environmental Protection in the Republic of Croatia

Mjesto i datum
Split, Hrvatska, 20.04.2023. - 21.04.2023

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
natural zeolite, sulphur-impregnated zeolite, heavy metals, selectivity

Sažetak
The toxicity of inorganic and especially organic forms of mercury is well-known since it is persistent in the environment, non- biodegradable and prone to bioaccumulation and biomagnification through the food web. The risk of mercury intoxication for living organisms takes on greater proportions if it originates from anthropogenic sources. Unfortunately, well-known examples date back to the not-so-distant past, such as in Minamata (in 1953, 1956, and 1965) and Iraq (in 1971/1972) [1]. Furthermore, abandoned mercury mining and exploitation sites such as Idrija in Slovenia represent a potential hotspot for the spread of pollution. Therefore, a simple remediation of the mentioned area could be carried out by sprinkling with a sorbent which should have a strong selectivity towards mercury. Since, the affinity of mercury to sulfur species is known according to the hard and soft acids and bases theory, in this paper the impregnation of natural zeolite with sulfur was carried out by immersing 1 g of zeolite in 10 mL of 1 mol/L Na2S·9H2O solution for 4 h at 25°C. Physicochemical characterizations (chemical composition, SEM- EDS, zeta potential) of the sample showed a 2.7-fold increase in sulfur content and an increase in negative charge. In order to test the selectivity of sulfur-impregnated zeolite towards Hg(II) ions, onecomponent (Hg, Cu, Zn, Cd, Mn, Ni, Co, Pb), two-component (Hg - Cu, Zn, Cd, Mn, Ni, Co, Pb) and eight- component solutions (Hg, Cu, Zn, Cd, Mn, Ni, Co, Pb) were prepared with an individual concentration of each metal cation of 2 mmol/L. In order to prevent the precipitation of metal cations, especially mercury, the experiments were carried out at pHo=2. Regardless of whether it was a one-component, two-component or eight-component solution, the results showed the same order of selectivity as follows: Hg>Pb>Cd>Zn>Cu>Ni>Co>Mn. The removal efficiency of Hg(II) in the one-component solution was 87% in the two-component solution 46-83% and in the eight-component solution 43%. The results indicate that a simple method of zeolite modification achieves significant selectivity towards Hg(II) in relation to other metal cations. Therefore, sulfurimpregnated zeolite could be a potential sorbent to prevent the spread of pollution from the area of the Idrija mine in Slovenia.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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