الفهرس | Only 14 pages are availabe for public view |
Abstract TiO2-based PEC sensors have been commonly employed for gas sensing, but they have rarely been employed for the detection of pollutants in the liquid phase. Just a few examples have recently appeared in literature for the latter condition including the sensing and determination of chemical oxygen demand in seawater, dopamine, Glucose, and hexavalent chromium, but not used until now for photo-sensing of nitrite ions which is considered as one of the most dangerous inorganic pollutant presence in the environment. Therefore, the goal of this thesis work is to develop cheap PEC sensor for the detection and quantification of NO2 − ions using commercially available TiO2 nanomaterials (e.g. TiO2 P25). To achieve this goal, TiO2-based PEC sensors have been fabricated and investigated in the dark and under UV(A) light illumination (LED 365 nm) at different conditions. This thesis includes three chapters. The first chapter (Introduction) This chapter includes a literature survey about the following points:- i- Some applications of titanium dioxide in the field of environmental sensing and energy production. ii- The basic principle of TiO2 photocatalyst including its crystal structures (i.e. anatase, rutile, brookite), band structure, and optical properties (direct and indirect transitions). The creation of heterostructure as an efficient route to improve the PEC efficiency was also introduced. |