Aqueous photocatalytic degradation of selected micropollutants by Pd-modified titanium dioxide in three photoreactor types

Abstract

The goals of the present study were to synthesise highly efficient Pd-TiO photocatalyst, to characterise its performance in slurry in smaller scale and to investigate its performance in the aqueous photocatalytic oxidation of three antibiotics: doxycycline, sulphamethizole and amoxicillin. The performance of the photocatalyst was evaluated in an open batch slurry reactor equipped with a fluorescent long-wavelength ultraviolet (UVA) lamp (0.2 L). With the fastest degrading doxycycline, experimental research was continued in a fixed-bed continuous flow photoreactor (0.13 L), with the Pd-TiO photocatalyst attached to a glass plate, and a medium laboratory-scale three-phase fluidised-bed reactor (2 L) equipped with four fluorescent UVA lamps, with the photocatalyst attached to the surface of expanded clay granules employed as the bed material. While showing very high activity in the batch slurry reactor, far surpassing P25 Aeroxide, the performance of Pd-TiO with doxycycline was comparable to P25 in the semi-continuous reactors.

Adsorption–photocatalysis synergy of reusable mesoporous TiO2–ZnO for photocatalytic degradation of doxycycline antibiotic

“… Catalyst Method Co/Dosage S.pH Light Degradation (%)/Time Reusability Ref. 3TiZn Photocatalysis 50 ppm/1 g/L Natural (4.4) UVC 100/20 min 10 This study 5%g-C 3 N 4 @ CeO 2 Photocatalysis 10 ppm/1 g/L, 100 μL H 2 O 2 NA Visible (150 W) 84/60 min 4 [ 61 ] BiOBr/FeWO 4 Photocatalysis NA/1 g/L NA Visible (300 W) 90/1 h 4 [ 62 ] Pd–TiO 2 Photocatalysis 25 ppm/1 g/L NA UVA (15W) 100/15 min – [ 63 ] H 2 O 2 /Fe (III) Fenton-based 10 μM/100 μM (Fe (III), 10 μM/(H 2 O 2 ) 3 UVC 100/<20 min – [ 9 ] NGQDs-BiOI/MnNb 2 O 6 Photocatalysis 10 ppm/0.5 g/L NA Visible (250 W) 65.7/120 min – [ …”