Band edge positions as a key parameter to a systematic design of heterogeneous photocatalyst

Abstract

Although, plenty of photocatalytic approaches have been developed in the past few decades to overcome major drawbacks, such as; wide band gap and fast volume/surface recombination of the charge carriers, the researchers still need to carry out careful systematic studies before conducting experiments based on physicochemical properties of a system. Thus, in this review, a detailed discussion of the band edge positions controlling the migration and charge separation of the produced charged carriers and its impact onto the photocatalytic systems are provided. The knowledge of band edge positions is a crucial prerequisite to a rational design of an efficient photocatalytic system. The enhancement mechanism should match these criteria to be reliable in the field of heterogeneous photocatalysis science.

Insights into the Photocatalytic Memory Effect of Magneto-Plasmonic Ag–Fe3O4@TiO2 Ternary Nanocomposites for Dye Degradation and H2 Production under Light and Dark Conditions

“…From the insights into the typical photocatalytic process, the band edge potential primarily matters in achieving the required reduction and oxidation process . For instance, in a certain context, it is proposed that if the conduction band edge potential is more negative (on NHE scale at zero pH), it could happen to be an efficient H 2 evolution photocatalyst, while if the valence band edge lies in more positive potential, it could be efficient toward O 2 evolution reactions. , Notably, these suitable potentials of the band edges fundamentally ensure the appropriate energy of the charge carriers in the respective bands toward achieving the required reduction and oxidation reactions .…”

Response surface optimization and modeling of caffeine photocatalytic degradation using visible light responsive perovskite structured LaMnO3

“…This is because their range of light absorption is limited only to the ultra-violet (UV) region which constitutes a small percentage (4-5%) of entire solar irradiation [15,16]. For more efficient and low-cost utilization photodegradation schemes, the utilization of light in the visible region of the solar spectrum which constitutes about 40-50% of the entire solar spectrum must be considered [17,18]. Some of the methods that have been widely explored to improve the visible light responsiveness of wide-bandgap semiconductors photocatalyst include doping [19], dye sensitization [4,20], and surface property modification [13].…”

“…In another study, perovskite structured LaMnO3 was utilized to effectively degrade rhodamine B dye [23]. Some of the reports indicate the usefulness of perovskite structured LaMnO3 and its modified forms in the photodegradation of various organic dyes [17][18][19][20][21][22][23]. Given the successes LaMnO3 recorded as a photocatalyst, it is interesting that little work is done on its utilization as an efficient photocatalyst for the degradation and mineralization of recalcitrant emerging pollutants.…”