Textbook in PDF format Photocatalysis is one of the most promising strategies for addressing severe issues regarding the environment and energy, and consequently attracts extensive and ongoing attention. Designing more efficient advanced photocatalytic materials and exploring green, carbon neutral photocatalytic reactions are both highly significant for promoting sustainability. Low-dimensional nanomaterials are rising stars in photocatalysis due to their unique and fascinating properties, encompassing inorganic nonmetallic materials, MOFs, LSPR materials, various nanocomposites, etc. This Special Issue focuses on designing advanced photocatalysts, understanding their structure-dependent properties, and seeking to exploit them in the fields of energy conversion, pollutant degradation, artificial photosynthesis, organic synthesis, etc