Adsorption of metal ions on slag

Onesnaževanje z odpadnimi vodami predstavlja velik delež onesnaževanja narave. V teh odpadnih vodah se pogosto nahajajo tudi težke kovine, ki jih moramo zaradi ogrožanja okolja, živali in ljudi iz vode odstraniti. Kot poceni metoda za odstranjevanje težkih kovin iz vode, se je uveljavila adsorpcija. V iskanju učinkovitih ter poceni adsorbentov, se je dobro izkazala tudi žlindra, ki je stranski produkt pri proizvodnji jekla. V diplomskem delu predstavljamo rezultate raziskave adsorpcijskih lastnosti bele žlindre. Žlindri smo najprej določili specifično površino BET, volumen por, premer por, velikost delcev in zeta potencial. Nadalje smo preučevali vpliv pH in koncentracije na adsorpcijo železovih, bakrovih in svinčevih ionov. Hkrati smo preučili še medsebojni vpliv izbranih ionov na adsorpcijo. Preučevali smo učinkovitost in kapaciteto adsorpcije in iz rezultatov ugotovili, da pH minimalno vpliva na adsorpcijo bakra in železa, svinec pa ima adsorpcijski maksimum pri pH 7. Pri preiskovanju vpliva koncentracije smo ugotovili, da učinkovitost adsorpcije s koncentracijo narašča za svinec, na baker in železo pa skoraj ne vpliva, saj je bila učinkovitost v območju koncentracij od 1 mM do 13 mM 100 %. Medsebojni vpliv ionov daje pozitivne rezultate na učinek adsorpcije.Waste water pollution represents a substantial share in environmental pollution. Quite often, waste waters contain heavy metals – and because they pose a threat to the environment, animals and humans, their removal from water is necessary. Adsorption has become a widely used and inexpensive method for removing heavy metals from water. In search for efficient and inexpensive adsorbents, slag, a steel-making by-product, has performed rather well. The present diploma thesis presents the findings of the study of white slag adsorption properties. First, specific surface area BET of slag was determined as well as pore volume, pore diameter, particle size and zeta potential. The next step was the determination of how pH and concentration affect the adsorption of iron, copper and lead ions. The interaction of the selected ions and their impact on the adsorption process was also studied. The results of adsorption efficiency and capacity reveal that the pH has minimal effect on the adsorption of copper and ironfor lead the adsorption maximum is at pH 7. Higher concentrations resulted in better adsorption efficiency for lead but hardly affected the adsorption of copper and iron – the efficiency range being from 1 mM to 13 mM 100%. The interaction of ions positively affects the adsorption efficiency