USO DA FOTOCATÁLISE HETEROGÊNEA COM SEMICONDUTORES BASEADOS EM HIDROTALCITA E DIÓXIDO DE TITÂNIO PARA O TRATAMENTO DE EFLUENTES COM CORANTES.

Effluents with dyes when released into the environment can cause damage to ecosystems, preventing access to light and thus harming various environmental processes. Thus, the aim of the present study was to carry out a literature review on the use of heterogeneous photocatalytic processes based on double lamellar hydroxide (HDL)- TiO2 composites in the treatment of wastewater with dyes. Currently, the main means for the treatment of dyes is the use of physicochemical adsorption processes, however, some dyes have high stability in the medium, making it difficult to remove them without the use of advanced processes. Advanced oxidative processes (AOPs) emerge as an effective alternative due to their high redox potential, where heterogeneous photocatalysis using TiO2 has advantages due to its excellent photocatalytic activity, lower toxicity and costs compared to other available semiconductors. Among the challenges of this process is the low adsorptive potential of TiO2, due to its low area and porosity, thus, the incorporation in clayey supports, such as hydrotalcite, becomes a possibility to improve the properties of the semiconductor and thus improve the photocatalys process. [ABSTRACT FROM AUTHOR]