Catalytic System with the Structure of Metal Oxides and Humic Acids for the Treatment of Contaminants Traces from Wastewaters and Method of Obtaining

The invention refers to a process for obtaining a catalytic system with the structure of metal oxides, under an ultrasound field, used in the advanced treatment of contaminants traces from wastewater resulting from the pharmaceutical industry and those from agriculture. The invention belongs to the technical field of treating contaminated water by photocatalytic oxidation. The catalytic system with magnetic properties, which contains Fe3O4 oxide components and humic acids (HA) synthesized by the utilization of vegetable waste, is obtained by the co-precipitation-drying method. Iron oxide (Fe3O4) is used as an intermediate coating, over which a layer of synthesized humic acids is deposited. The magnetic photocatalyst can be activated in the presence of sunlight being used to treat water impure with contaminants.

The proposed catalytic system has the following advantages: it is relatively cheap; it has photocatalytic activity; it is used to treat contaminated water in a relatively short time; it can be quickly recovered and reused repeatedly and its preparation in the ultrasound field favors the homogeneous dispersion of iron oxide.