Titanium Dioxide and Carbon Nanomaterials for the Photocatalytic Degradation of Organic Dyes / Visible Light Photocatalytic Degradation of Environmental Pollutants Using Metal Oxide Semiconductors / Contemporary Achievements of Visible Light-Driven Nanocatalysts for the Environmental Applications / Application of Nanocomposites for Photocatalytic Removal of Dye Contaminants / Photocatalytic Active Silver Phosphate for Photoremediation of Organic Pollutants / Plasmonic Ag-ZnO: Charge Carrier Mechanisms and Photocatalytic Applications* / Multifunctional Hybrid Materials Based on Layered Double Hydroxide towards Photocatalysis / Magnetically Separable Iron Oxide-Based Nanocomposite Photocatalytic Materials for Environmental Remediation / Photo Functional Materials for Environmental Remediation / Graphitic Carbon Nitride-Based Nanostructured Materials for Photocatalytic Applications / Metal-Organic Frameworks for Photocatalytic Environmental Remediation / Active Materials for Photocatalytic Reduction of Carbon Dioxide