Near-Ultraviolet Light-Driven Photocatalytic Chlorine Activation Process with Novel Chlorine Activation Mechanisms

In this study, the near-ultraviolet (near-UV) light-driven TiO2 photocatalytic chlorine activation process, termed as UV365/TiO2/chlorine degrades a representative recalcitrant micropollutant, carbamazepine (CBZ), at an apparent first-order rate constant (kCBZ?) that is 34.2 and 3.9 times higher than those without chlorine, respectively. serves more important role catalyst to enhance yield of hydroxyl radicals (HO·) being consumed, in addition its radical precursor produce HO· reactive species. kCBZ? increased with increasing dosages from 1.0 20.0 mg/L light intensities 0.1 0.33 mW/cm2 decreasing 5.0 mgCl2/L. Increasing pH overall concentrations but transformed Cl· less ClO·, leading 6.0 9.0. The dual roles process enabled rapid CBZ degradation dosage about 1/20 conventional UVC/chlorine 1/200 UVC/TiO2 electrical energy per order least 2-order magnitude lower existing UVC-based processes.