1. Titanium Dioxide Based Nanomaterials for Photocatalytic Water Treatment 2. Hydrogen Peroxide Photolysis (H2o2/Uv) for Industrial Wastewater Reuse 3. Uvc Irradiation Based Water Treatment 4. Photocatalytic Activities of Antimony, Iodide, and Rare Earth Metals on Sno2 for the Photodegradation of Phenol and its Intermediates Under Uv, Solar and Visible Light Irradiations 5. Modification of Photocatalysts with Enhanced Photocatalytic Activity for Water Treatment 6. Sustainable Production of Value Added Chemicals and Materials from Lignocellulosic Biomass: Carboxylic Acids and Cellulose Nanocrystals