The application of nanostructured materials into AOPs processes for advanced oxidation of priority pollutants from wastewater, FOTOX

Abstract

"The general target of the project was to elaborate an advanced degradation technology for prior compounds specified in GD 351/2005 as chlorinated aromatic compounds (maximum accepted concentration level of g/l), by heterogeneous photocatalysis based on solar light as UV source and photocatalysts like TiO2 nanostructurated materials. Project results were concretized by the followings: -Documentary study regarding the AOPs applied processes in the field of advanced degradation of priority pollutants like aromatic chlorinated compounds and influence factors of photodegradation processes. -Setting the pollution level with aromatic chlorinated compounds and pollution context of some wastewater sources. -Study of sol-gel method applied in order to synthesize macromolecular lattice of metallic oxide and the influence factors of the process. -Setting the kinetic equations and photodegradation mechanisms of Chlorobenzene via direct photolysis, homogeneous and heterogeneous catalyzes and evaluation the influence of operating parameters on rate constants and process efficiency. -Assessment of pollutant structure influence and wastewater pollution context upon photodegradation efficiency. -Obtaining of photocatalyst as nanometric sol-gel powder based on S doped TiO2 having the followings characteristics: presence of TiO2 in a single crystalline phase - anatase, crystalline degree = 98%, crystallite dimension = 147 Å. -Setting treatment technology of wastewater with chlorobenzene content (mg/l content), and establishing of optimal operating parameter able to assure a high pollutant removal degree according with stipulated in force limit (g/l); the proposed technology tested on solar photocatalytic pilot installation, consists of: pre-treatment by neutralization-settling (optional applied for removal of suspended matters > 60 mg/l and/or iron > 0.5 mg/l), heterogeneous photocatalysis (pH = 7, S -TiO2 dose = hundreds mg/l, reaction time / mg CB removed tens min), photocatalyst separation and recirculation"