Аутори:
1. Бранко Шкундрић, Академија наука и умјетности Републике Српске, Republic of Srpska, Bosnia and Herzegovina
2. Rada Petrovic, Republic of Srpska, Bosnia and Herzegovina
3. Jelena Penavin-Škundrić, Природно-математички факултет Бања Лука, Republic of Srpska, Bosnia and Herzegovina
4. Драгана Гајић, Природно-математички факултет Бања Лука, Republic of Srpska, Bosnia and Herzegovina
5. Darko Bodroža, Faculty of Technology Banja Luka, Republic of Srpska, Bosnia and Herzegovina

Апстракт:
This paper studies adsorption of hexavalent chromium, Cr(VI), from aqueous solution onto natural clay kaolinite (kaolinite mine “Motajica”, Kobaš, Srbac). The effect of adsorbent weight, contact time, pH value of solution and temperature on efficiency of adsorption was examined. Optimal parameters were: adsorbent weight m=0,5 g; contact time t=1 hour; pH=3,0 and temperature t=35ºC, while the efficiency, based on these parameters, was 31,12%. Adsorption of hexavalent chromium, Cr(VI), from aqueous solution onto natural clay kaolinite is the result of electrostatic interactions. Experimental data were analyzed using three linearized adsorption models: Freundlich, Langmuir and Temkin. In this adsorption process of hexavalent chromium, Cr(VI), onto kaolinite, the Freundlich isotherm model has the highest value of correlation coefficient (R2=0,961) and therefore best describes equilibrium phenomena of Cr(VI) adsorption onto this adsorbent. Based on the value of Freundlich constant, KF (=0,0416 (mgg-1)(mgL-1)1/n), which is in the correlation with adsorbent capacity, it is concluded that kaolinite has relatively low adsorption capacity for hexavalent chromium, Cr(VI). The second Freundlich constant, n, is related to adsorption intensity of adsorbent and surface heterogeneity. Obtained value for n, is greater than one (n=1,2516) and indicates that it is favored adsorption. Based on obtained and analyzed data of adsorption process, it can be concluded that natural clay kaolinite showed sufficient removal efficiency to be used as an adsorbent for hexavalent chromium, Cr(VI), removal from aqueous solutions.

Кључне речи:
adsorption, kaolinite, hexavalent chromium, Cr(VI), Freundlich isotherm, Langmuir isotherm, Temkin isotherm

Тематска област:
СИМПОЗИЈУМ А - Наука материје, кондензоване материје и физикa чврстог стања

Датум пријаве сажетка:
06.07.2020.

Конференцијa:
Contemporary Materials 2020 - Савремени материјали