A Review of Reduced Electron/Hole Recombination in Coupled Photocatalysts for Dyes Degradation

Organic dyes have attracted a lot of attention due to their long-term environmental toxicity and short-term damage to health. The process of photocatalysts with the use of semiconductors for efficient use of solar energy in the degradation of dye pollutants has received much attention for environmental improvement. Electron transfer is the most important and fundamental step in photocatalysts processes. The efficiency of electron transport is the function of the location energy level of valence layer and the conduction layer relative to the reduction potential of the adsorbed particles on the catalyst. One of the methods of preventing recombination of electrons/holes is direct conductivity of electron and holes to the other catalyst. This is possible using heterojunction photocatalysts with different valence and conduction band potentials. In other words, the coupling of two semiconductors, the valence and conduction bands, have different energy levels, causing more effective separation. The purpose of this study is to investigate different Load transmission mechanisms in pair and p-n junction photocatalysts.