hrvatski

Photocatalytic oxidation of antibiotics in CPC reactor over TiO2 /CNT - PETG static mixer

Trace levels of pharmaceuticals and their related metabolites are often found in surface waters[1]. For example, in Croatia as the member of the European Union, one of the emphasis is on the antibiotics from the Second Watch list of contaminants of emerging concern (WL) under the Water Framework Directive (WFD). Nowadays, the emphasis is even more highlighted due to COVID-19 pandemic and increased pharmaceuticals consumption in healthcare systems. Therefore, in this paper, application of photocatalytic oxidation process for the degradation of residual antibiotics pollutants (Table 1) in accordance with the Second Watch Lists are presented. The photocatalytic oxidation was performed in a laboratory compound parabolic collector (CPC) reactor which has been considered as the state-of-the-art of the photocatalytic reactors. As a simulation of a sunlight, modular panel with the full spectra solar lamps with the appropriate UVB and UVA irradiation levels were used. As a photocatalyst, a commercially available titanium dioxide (TiO2 P25) and multiwalled carbon nanotubes were immobilized on a PETG carrier (Helix form of static mixer) in process of 3D printing. The addition of MWCNTs was considered thus resulting in photocatalytic oxidation intensification due to enhanced photon absorption in wider wavelength range. Based on the experimental results of antibiotics degradation, predictive mathematical model was developed to estimate antibiotics degradation in CPC reactor independent on the reactor size, capacity, and irradiation conditions. The model could effectively be applied on a pilot scale CPC reactor for the antibiotic removal in surface waters.

Antibiotics ; Photocatalysis ; Titanium dioxide (TiO2 P25) ; Multiwalled carbon nanotubes (MWCNT)

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