Application of BiOX Photocatalyst to Activate Peroxydisulfate Ion-Investigation of a Combined Process for the Removal of Organic Pollutants from Water

The persulfate-based advanced oxidation processes employing heterogeneous photocatalysts to generate sulfate radicals (SO4•?) from peroxydisulfate ion (PDS, S2O82?) have been extensively investigated remove organic pollutants. In this work, BiOX (X = Cl, Br, and I) were activate PDS enhance the transformation rate of various substances under UV (398 nm) Vis (400–700 radiation. For BiOCl BiOBr, in addition excitability, light-induced oxygen vacancies are decisive activity. Although without substances, BiOI efficiency highly exceeds that BiOBr for activation (for BiOI, 15–20%, while BiOCl, only 3–4% transformed); each catalyst showed enhanced activity 1,4-hydroquinone (HQ) due semiquinone radical-initiated activation. sulfamethoxypyridazine (SMP), is driven by direct charge transfer, effect was less manifested. proved efficient transforming even (HQ wholly transformed within 20 min, SMP conversion increased 40% 90%) damaging catalyst; its did change over three consecutive cycles. Results related well-adsorbed trimethoprim (TRIM) application biologically treated domestic wastewater as a matrix highlighted limiting factors method visible light active photocatalyst, BiOI.