Photocatalytic degradation kinetics and mechanism of environmental pharmaceuticals in aqueous suspension of TiO2: A case of sulfa drugs

Mechanism, kinetics and toxicity assessment of OH-initiated transformation of triclosan in aquatic environments

“…Research in this area has mainly been focused on identifying and quantifying the polychlorinated dibenzo-p-dioxin (called "dioxin" in the rest of this paper) photoproducts that can be formed and the transformation pathways in the direct photolysis and photosensitized transformation of TCS (Anger et al, 2013;Kliegman et al, 2013;Latch et al, 2003Latch et al, , 2005Mezcua et al, 2004;WongWah-Chung et al, 2007 formed and are constantly present at low concentrations in natural waters (Dong and Rosario-Ortiz, 2012;Vione et al, 2006). Of these, OH is a well-known highly reactive oxidant that plays an important role in the transformation of a wide spectrum of ECs in natural waters (Dong and Rosario-Ortiz, 2012;Wenk et al, 2011) because of the high absolute bimolecular rate constants with ECs (An et al, 2010a(An et al, , 2010bBuxton et al, 1988;Fang et al, 2013;Yang et al, 2010). High OH concentrations can be produced easily under certain extreme conditions, for example in advanced oxidation process (AOP) systems (An et al, 2010a(An et al, , 2010bBokare and Choi, 2011;Fang et al, 2013;Shu et al, 2013;Yang et al, 2010).…”

Enhancement of photocatalytic activity of nano-scale TiO2 particles co-doped by rare earth elements and heteropolyacids

“…Among numerous semiconductor materials, TiO 2 has been regarded as one of the most promising photocatalysts for the degradation of organic pollutants, because of its physical and chemical stability, low cost, no toxicity, and unique electronic and optical properties [1][2][3][4]. However, the utilization of pure TiO 2 is significantly constrained because of its wide band gap, low efficiency of sunlight utilization, low quantum efficiency, and high recombination rate of electrons-holes.…”

Humic Acid Degradation by ZnO Photocatalyst

“…HA degradation decreased as the initial concentration increases and repulsive forces between molecules occurred, which effected in reduction in the number of hydroxyl radicals generated on the surface of catalyst by UV irradiations. Futhermore, a solution with a low concentration of HA with the same amount of hydroxyl radicals will have a higher degradation rate than a solution with a high concentration [9][10][11]. Previous studies on trichloroethylene (TCE) reported that the reaction by-products generated during the photocatalytic reaction can also decrease the degradation rate [11].…”