Photocatalytic Concrete Using ZnO and Al₂O₃ - A Review

Abstract

Photocatalytic concrete is one of the innovations in the construction sector that environmentally friendly. Photocatalytic concrete can be decomposing harmful pollutants such as nitrogen oxides (NOx) and SO2. In its application, a widely used photocatalyst is TiO2. In fact, the use of TiO2 has several disadvantages, which is less efficient because the separation of TiO2 photocatalysts is very difficult and requires greater energy. In addition, the wide band-gap energy of TiO2 makes only a fraction of the ultraviolet (UV) fraction of sunlight usable. This study aims to analyse photocatalysts that are more usable in large quantities and easy to apply. Based on research that has been done, the use of ZnO and Al2O3 as photocatalysts replaces the use of TiO2 which has been used effectively to do. In addition to its simpler use, and its abundant availability, Al2O3 and ZnO can break down pollutants well.