The theoretical and experimental investigations carried out in this work relate to the application of chemistry and chemical engineering and process intensification methodology to the development of advanced photocatalytic processes. The aim of this work is to investigate the possibility of intensification of photocatalytic processes by using a permanent magnet. During the experimental part of the work, photocatalytic degradation of the selected neonicotinoid insecticide was monitored in an aqueous solution with a suspended TiO2 photocatalyst. Neodymium magnets (NdFeB) were used as the strongest permanent magnets to enable effective separation of charge carriers and improve the overall photodegradation efficiency. Magnets with different dimensions and magnetic flux densities on their surface were used (50x2.5 mm (0.20 T); 50x10.0 mm (0.34 T)). Imidacloprid was chosen as a model component because its intensive application poses a risk and hazard to the aquatic environment, including living organisms that come into contact with such contaminated water sources. Photocatalytic degradation of imidacloprid was carried out in a batch reactor with controlled and constant recirculation of the reaction mixture and suspended photocatalyst. The initial concentration of imidacloprid in the solution was 10 ppm. The experimental design included three parameters: the presence of a permanent magnet, i.e., the value of magnetic flux on the surface of the magnet (0 T, 2x0.20 T, and 0,34 T), the radiation intensity (10,0 mW/cm^2, 30,0 mW/cm^2, and 50.0 mW/cm^2), and the mass of the photocatalyst (1.0 mg, 3.0 mg, and 5.0 mg). Commercially available powdered TiO2P25 (Degussa/Evonik) was used as the photocatalyst. Photocatalytic degradation was performed by photoactivation using the UVA part of the electromagnetic spectrum and UVA-LED lamps with a power of 30 W were used as the source. The analysis of the products was carried out by applying high performance liquid chromatography. The research results showed that the intensity of radiation and the mass of photocatalyst have the greatest influence on the efficiency of photocatalytic degradation of imidacloprid. It was found that the conversion increased with increasing radiation intensity and photocatalyst mass. It was also found that under the reaction conditions and power of the photoreactor used in this work, the use of permanent magnets had no significant effect on the photocatalytic degradation of imidacloprid.