Binding of lead ions to zeolite onto the presence of Humistar r solution of different concentration and ptf values : diploma thesis

U ovom radu ispitano je vezanje iona olova na prirodnom zeolitu klinoptilolitu u prisutnosti otopine Humistar ® koja sadrži visoki udio huminskih kiselina i drugih organskih spojeva te tako simulira organske tvari prisutne u tlu. Eksperimenti su provedeni s otopinama različitih početnih koncentracijama iona olova te je ispitan utjecaj prisustva huminskih kiselina na točnost određivanja koncentracije olova metodom kompleksometrijske titracije. Eksperimenti vezanja olova na prirodnom zeolitu u otopinama različitih početnih koncentracija olova i različitih početnih koncentracija Humistar ® otopina provedeni su pri različitim pH vrijednostima. Pri višim koncentracijama iona olova utvrđena je veća količina vezanog olova po gramu zeolita, a najveće vrijednosti su dobivene uz dodatak 0,06% otopine Humistar®. Pri nižim početnim koncentracijama olova, dodatak otopine Humistar ® udvostručilo je količinu vezanog olova, a porastom koncentracije Humistara ® vrijednosti su se uvećale za tri puta u odnosu na kontrolnu suspenziju. Pri tome nije bilo utjecaja pH vrijednosti na kapacitet vezanja. Najviši stupanj uklanjanja olova je dobiven za niže koncentracije olova i uz veći dodatak Humistara ® . Temeljem dobivenih rezultata može se zaključiti da bi prisutnost organske tvari u tlu mogla povećati učinkovitost uklanjanja pri remedijaciji teških metala primjenom prirodnog zeolita.In this work, the binding of lead ions on the natural zeolite clinoptilolite has been examined in the presence of Humistar ® solution, with high amount of humic acids and other organic compounds simulating the organic matter found in the soil. Experiments have been conducted in solutions with different initial concentrations of lead ions, and the influence of the humic acids on the accuracy of lead determination by the complexometric titration has been examined. The lead ions removal on natural zeolite in solutions of different initial concentrations of lead and different concentrations of Humistar ® solutions have been performed at different pH values. At the higher concentrations of lead ions, higher amount of lead has been removed per gram of zeolite, where the highest values are recorded with addition of 0.06% of the Humistar ® solution. At lower lead concentration the addition of the Humistar ® solution increased removal for double, and increase of the Humistar ® solution concentrations increased removal for triple compared to the control suspension, respectively. The influence of the pH value on removal capacity in all experiments was negligible. The highest removal efficiency has been observed for lower lead concentrations with higher content of the Humistar ® solution. Based on the observed results it can be concluded that appearance of organic matter in the soil might increase removal efficiency during remediation of heavy metals using natural zeolites