Abstract
BackgroundIn the last few decades the quality of natural water has often deteriorated as a variety of novel pollutants have contaminated rivers and lakes. Trace amounts of some man-made chemicals can be hazardous to plants, animals as well as human health as carcinogens, mutagens or endocrine disruptors. Light radiation may help in its decomposition, aided by naturally occurring colored organic compounds (humic substances) in the water. The aim of these studies was to check the influence of presence of organic and inorganic matter on the removal of endocrine disrupting compound - butylparaben (BP) from water.MethodsPhotochemical decomposition of BP in aqueous solution using: photolysis by ultraviolet-C (UVC) and visible (VIS) irradiation, advanced oxidation in H2O2/UV system and photosensitized oxidation was examined. The degradation processes were carried out in different type of water matrix: natural water from Sulejow Reservoir, simulated natural water with humic acids and buffered solution.ResultsThe presence of dissolved organic matter in water did not influence much on UVC photolysis and increases only about 8% of BP depletion rate in H2O2/UV system. While during visible light photolysis and photosensitized oxidation the addition of natural water matrix causes the acceleration of reaction rate by 16% and 36%, respectively. Moreover BP degradation proceeds via singlet oxygen generated from humic substances.ConclusionsButylparaben undergoes both direct and indirect photodegradation in aqueous solution under UVC and visible radiation. The efficiency of the H2O2/UV process, photolysis as well as photosensitized oxidation processes is strongly dependent on composition of the water.
Highlights
In the last few decades the quality of natural water has often deteriorated as a variety of novel pollutants have contaminated rivers and lakes
The degradation of butylparaben occurs by direct photolysis in reservoir water (RW) and Buffered solution at pH 8 (BS1), due to overlapping of the absorption spectrum of butylparaben with UVC and xenon arc lamps
UVC photolysis of butylparaben proceeded slightly slower (Figure 3a) in natural water compared with photolysis in buffered solution (BS1), whereas, the advanced oxidation of butylparaben in a H2O2/UV system was about 18% (Figure 3a) faster in reservoir water than in BS1
Summary
In the last few decades the quality of natural water has often deteriorated as a variety of novel pollutants have contaminated rivers and lakes. Trace amounts of some man-made chemicals can be hazardous to plants, animals as well as human health as carcinogens, mutagens or endocrine disruptors. Light radiation may help in its decomposition, aided by naturally occurring colored organic compounds (humic substances) in the water The aim of these studies was to check the influence of presence of organic and inorganic matter on the removal of endocrine disrupting compound - butylparaben (BP) from water. In the last few decades the quality of natural water has often worsened owing to contamination with man-made trace organic chemicals These are sometimes carcinogens, mutagens or endocrine disruptors. Contaminations have influence on the condition and population sizes of animals Photochemical degradation of these substances has been attempted and may be influenced by the array of dissolved organic matter (DOM), e.g., humic and fulvic acids, and by nitrate as well as other inorganic ions [9].
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