Influence of water matrix on benzophenone degradation by UV irradiation

Ivana Ivančev-Tumbas, Minja Bogunović, Marjeta Česen, Aleksandra Tubić, Ester Heath

Abstract


This study presents the results from a bench-scale UV irradiation expe­riment of benzophenone (BP) in different water matrices. Despite the reported resistance of BP to UV-irradiation, it was successfully degraded in solution when intensively irradiated by UV light in a batch reactor for 4 h. In this way, it was possible to remove 56 and 45 % of 1.0 and 10 µg·L-1 of BP in Milli-Q water, respectively. The addition of a mixture of anions suppressed the degradation of BP at the lower concentration level by 20 %. The addition of a dissolved organic carbon (DOC) surrogate mixture (DOC:BP mole ratio of 3000:1) increased the degradation of BP in Milli-Q water (removal 80 %). At 1.0 µg·L-1 of BP and 1.0 mg·L-1 of DOC, removal was 70 %, while at 10 µg·L-1 of BP and 10 mg·L-1 of DOC, there was no observable difference in removal compared with the removal in Milli-Q water. The results show that both DOC and anions influence the photodeg­radation of BP. Furthermore, it was shown that the removal efficiency depends on the concentration of BP. These findings show the importance of a detailed char­acterisation of the water matrix in studies relating to the removal of micropollutants during UV irradiation.


Keywords


micropollutant; fotodegradation; DOC; inorganic ions

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DOI: https://doi.org/10.2298/JSC181102112I

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