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- Fentonov proces s heterogenim katalizatorom primijenjen je za razgradnju prirodnih organskih tvari iz dva izvora: standardne otopine huminske kiseline i prirodne podzemne vode osjeckog podrucja. U tu su svrhu pripremljeni željezovi katalizatori na nosacu i to impregnacijom razlicitih oblika željeza (Fe(III), Fe(II), FeOOH) na bazni materijal. Kao nosaci su ispitani: prirodni zeolit klinoptilolit i dvije komercijalne vrste aktivnog ugljena, Hidraffyn 30N i Silcarbon K835. Cilj istraživanja je bio ispitati ucinkovitost heterogenih Fentonovih procesa i usporediti ih s odgovarajucim homogenim Fentonovim procesom te utvrditi utjecaj najvažnijih parametara procesa (koncentracije katalizatora, koncentracije H2O2, pH). Kada se proces odvijao u optimalnim uvjetima, homogeni katalizator se pokazao nešto ucinkovitijim u usporedbi s odgovarajucim procesom uz upotrebu heterogenog katalizatora. Udaljavanjem uvjeta od optimalnih, ucinkovitost homogenog procesa naglo opada, dok je ucinkovitost heterogenih procesa konstantnija i procesi su manje osjetljivi na promjenu procesnih parametara te u tim uvjetima heterogeni procesi daju slicne ili cak bolje rezultate.- An application of heterogeneous Fenton-type catalyst was investigated for the degradation of natural organic matter from two sources: model humic acid solution and natural groundwater from town Osijek area. For this purpose, supported iron catalysts were prepared by impregnation of different iron forms (Fe(III), Fe(II), FeOOH) on support materials. Different supports were evaluated: natural zeolite clinoptilolite and two commercial types of activated carbon, Hidraffyn 30N and Silcarbon K835. The aim of this study was to investigate the performance of heterogeneous Fenton processes and compare them with the corresponding homogenous Fenton process. The effect of the most relevant operating conditions (catalyst concentration, H2O2 concentration, pH) was estimated. When process was conducted in optimal conditions, homogeneous catalyst showed slightly higher efficiency when compared to the corresponding processes applying heterogeneous catalyst. Moving away from optimal conditions, the effectiveness of homogeneous processes was rapidly decreased, while the efficiency of heterogeneous processes was more constant and processes were less sensitive to the change of process parameters and in these conditions the heterogeneous processes gave similar or even better results.- 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