ABSTRACT
Increasing pure water demand and global warming due to exhaustive greenhouse gas emissions from fossil fuel motivates to concentrate on the utilization of abundant solar energy for pollutant degradation and renewable energy by photocatalyst. This chapter deals with the basic philosophy on the probable use of ceramic photocatalyst to solving the serious environmental pollution and energy problems. Fundamental concept on band gap, selection of band position, electron-hole charge transportation phenomena, role of scavenger, surface modifications, details about regenerative and photosynthetic solar cells, semiconductor-electrolyte interaction and band bending, output, and governing parameters are discussed and compared with nanoscale particle size and characterization parameters.
