**5. Conclusions**

Photocatalytic adsorbents nanoparticles have a tremendous potential to wastewater treatment for capture and degrade many contaminants. Coupling of adsorption and photocatalysis demonstrated to be an efficient process to overcome of the limitations presented by the separated techniques. α-Hematite and metal-organic frameworks have exhibited excellent adsorption performance for removing contaminants from aqueous solutions and superior photocatalytic capacities to degrade and mineralize many recalcitrant compounds in visible light. Some researches have been developed to couple the TiO2 properties with MOFs or α-Fe2O3, as well as other inorganic or organic compounds, to enhance the photocatalytic activity. As illustrated in this review, a range of photocatalytic adsorbents technologies have been proposed or are under active development for wastewater treatment, but many techniques are still at an experimental or pilot stage.
