Provider: - Institution: Josip Juraj Strossmayer University of Osijek. FACULTY OF FOOD TECHNOLOGY. Department of Applied Chemistry and Ecology. Sub-department of Chemistry and Ecology. - Data provided by Europeana Collections- Podzemne vode glavni su izvor vode za piće za populaciju istočne Hrvatske, a nedavno objavljeni rezultati istraživanja upotvrdili su prisutnost anorganskih spojeva arsena u većini vodonosnika istočne Hrvatske u koncentracijama iznad 10 μg L-1. U radu ispitana je mogućnost adsorpcije arsenovih aniona iz modelnih otopina i aerirane podzemne vode na različite adsorpcijske materijale: biosorbense – natrijeva alginata i karboksimetil celuloze, zeolite –klinoptilolita iz dva ležišta - Vranjska Banja i Donje Jesenje, te na dvije vrste aktivnog ugljena - Hydraffyn 30N i Silcarbon K 835. Svi navedeni adsorpcijski materijali su prije ispitivanja funkcionalizirani zasićenjem površine Fe(III) ionima, a potom je ispitan utjecaj glavnih čimbenika učinkovitosti adsorpcije : početne koncentracije arsena, vremena adsorpcije, pH-vrijednosti i temperature na adsorpcijske kapacitete navedenih materijala. Mjerenjem masene koncentracije prije i nakon primjene navedenih sorpcijskih materijala, određen je učinak pojedinog adsorbensa pri uklanjanju arsena iz navedenih otopina, a dobiveni podaci su obrađeni matematičkim modelima Freundlichove i Langmuirove adsorpcijske izoterme. Utjecaj temperature na učinak adsorpcije arsena ispitan je promjenom temperature medija u rasponu od 25 °C do 45 °C. Rezultati istraživanj su pokazali da je adsorpcijski kapacitet ispitanih adsorbensa u obrnuto proporcionalnoj ovisnosti sa koncentracijom arsena u otopini, dok je pozitivan učinak na adsorpcijski kapacitet imalo sniženje pH-vrijednosti. Povećanje temperature otopina negativno se odrazilo na učinak adsorpcije na biopolimere, a pozitivno na adsorpciju arsena na zeolitne adsorbense i aktivne ugljene- Groundwater is the main source of drinking water in eastern Croatia and the population of nearly 200,000 people daily drinking water with arsenic concentration over the 10 μg L-1. The removal of arsenic anions from aqueous solutions and groundwater using the sorbents: biosorbents, zeolites and activated carbons were investigated. All adsorbents were functionalized with ferric ions before examination using different methods of modification. The influence of experimental parameters variations, including initial As(V) concentration, adsorption time, pH and temperature were examined using standard solutions of As(V) and aerated groundwater of the Osijek area. The influence of each parameter was determined, and obtained data were fitted by Freundlich and Langmuir isotherm models. Thermodynamic parameters for the adsorption systems were determined at 25°C, 35°C and 45°C. Obtained adsorption models points out that the adsorption capacity decreased by increasing the As(V) ions concentration and pH value, while longer time contact between arsenic and adsorbent increased efficiency of arsenic removal. Finally, one of the main goals of this study was determination of temperature influence on adsorption system, and experimental results showed that, in the case of zeolites and two types of commercially available activated carbons, the increase of adsorption capacity with temperature appears to be related to a higher arsenic dissociation, while biopolymeric adsorbents showed strong decrease of adsorption capacity with temperature increasing.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana