Abstract
New photocatalyst for decomposition of humic acids in photocatalysis and photo-Fenton processes Humic acid Leonardite IHSS standard was decomposed on TiO2 and TiO2 modified by FeC2O4 via the photocatalysis and photo-Fenton processes under UV irradiation. Humic acid (HA) were favorable adsorbed on TiO2 surface and followed decomposition during UV irradiation faster on TiO2 than on the modified samples. However, when H2O2 was added to the solution, the photo-Fenton process occurred on the prepared TiO2 samples, contained iron together with photocatalysis and high acceleration of HA decomposition was observed. In this case the mineralization degree was much higher than in the applied photocatalysis only, around 75% HA (with concentration of 18 mg/L) was mineralized after 3 h of adsorption and 5 h of UV irradiation in the presence of H2O2 and modified TiO2 whereas on TiO2 mineralisation of HA occurred in around 45% only. The measured fluorescence spectra of HA solutions showed that in the presence of H2O2 polycyclic aromatics were rapidly oxidized to the lower size products such as alcohols, aldehydes, ketones and carboxylic acids, what accelerated the process of HA decomposition.
Highlights
Humic acid is a natural organic compound, a component of humic substances which is derived from the decomposition of plants and animals materials
The iron phases were active in the photo-Fenton process under UV irradiation with H2O2 enhancing the decomposition rate of Leonardite Humic acid (HA)
Lower temperatures of the modification such as 500 and 600°C were favorable for obtaining the photocatalyst active for HA degradation in both photocatalysis and photo-Fenton
Summary
Humic acid is a natural organic compound, a component of humic substances which is derived from the decomposition of plants and animals materials. HA is a high risk, because it can be a precursor of trihalomethanes (THMs) formation during chlorination of water. THMs are classified as carcinogenic compounds[2]. Applying Advanced Oxidation Processes (AOP) seems to be reasonable. These processes are characterised by their ability to form strong oxidising species, the hydroxyl radicals. It was reported that hydroxyl radicals oxidise wide range of organic compounds significantly faster than ozone[2]. In Fenton process hydroxyl radicals are produced during the decomposition of hydrogen peroxide in the presence of ferrous salts: H2O2 + Fe2+ → HO + HO- + Fe3+
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