| Summary: | Atrazine is a systemic herbicide widely used in weed control. In recent years, it has been largely detected in surface and groundwater in several locations all over the world. Photocatalysis is a green and sustainable technology with huge application prospects in pollution control and the degradation of organic water pollutants. In this work, photodegradation of aqueous atrazine was investigated over pristine graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) synthesized via urea pyrolysis and graphene/g-C<sub>3</sub>N<sub>4</sub> composite synthesized via the in situ growth method involving direct deposition of g-C<sub>3</sub>N<sub>4</sub> nanosheets on the graphene surface. The obtained photocatalysts were characterized using transmission and scanning electron microscopy, Fourier-transformed infrared spectroscopy, UV-visible spectroscopy, photoluminescence spectroscopy, X-ray diffraction, and surface area measurements. It was demonstrated that the composite material exhibited remarkable photocatalytic properties for the efficient degradation of aqueous atrazine under visible light at ambient temperature. After 5 h of reaction, atrazine conversion reached 100% in the presence of graphene/g-C<sub>3</sub>N<sub>4</sub> composite, while the pristine g-C<sub>3</sub>N<sub>4</sub> allowed 40% conversion under the same conditions, thus demonstrating the positive effect of graphene on the photocatalytic activity of g-C<sub>3</sub>N<sub>4</sub>. Moreover, graphene/g-C<sub>3</sub>N<sub>4</sub> was shown to keep its activity even when it was recycled five times, thus proving its stability and its potential to be used at the industrial scale.
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