Photocatalytic Degradation Pathways of the Valsartan Drug by TiO2 and g-C3N4 Catalysts

The photocatalytic degradation of the valsartan (VLS) pharmaceutical using TiO2 and g-C3N4 catalysts under simulated solar light is studied in this paper by high-resolution Orbitrap mass spectrometry. •OH radicals were major oxidant species for TiO2, while positive holes (h+), followed a much lesser amount radicals, case g-C3N4. Valsartan first order kinetics both with being catalyst better efficiency. transformation products (TPs) their evolution profiles are identified monitored, respectively, means LC-HRMS. Based on TPs identification, mechanisms discussed. pathways include decarboxylation subsequent oxidation, hydroxylation, cleavage C–N bond, cyclization, abundant hydroxylation occurs stage products. study highlights complex nature formed during such processes, different involved necessity identification assessment treatment tracking environmental compartments.