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Enhanced photocatalytic activity using GO/TiO 2 catalyst for the removal of DCA solutions.
Environmental Science and Pollution Research International 2017 December 24
This work aimed to optimize high-performance photocatalysts based on graphene oxide/titanium dioxide (GO/TiO2 ) nanocomposites for the effective degradation of aqueous pollutants. The catalytic activity was tested against the degradation of dichloroacetic acid (DCA), a by-product of disinfection processes that is present in many industrial wastewaters and effluents. GO/TiO2 photocatalysts were prepared using three different methods, hydrothermal, solvothermal, and mechanical, and varying the GO/TiO2 ratio in the range of 1 to 10%. Several techniques were applied to characterize the catalysts, and better coupling of GO and TiO2 was observed in the thermally synthesized composites. Although the results obtained for DCA degradation showed a coupled influence of the composite preparation method and its composition, promising results were obtained with the photocatalysts compared to the limited activity of conventional TiO2 . In the best case, corresponding to the composite synthesized via hydrothermal method with 5% of GO/TiO2 weight ratio, an enhancement of 2.5 times of the photocatalytic degradation yield of DCA was obtained compared to bare TiO2 , thus opening more efficient ways to promote the application of photocatalytic remediation technologies.
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