In this experiment, titanium trichloride was chosen as the titanium source of TiO2 and dicyandiamide was selected as the precursor of g-C3N4 to prepare the g-C3N4/TiO2 composites. The morphology, elements, and catalytic properties characterization of g-C3N4/TiO2 were characterized by transmission electron microscope (TEM), X-ray diffraction (XRD) and ultraviolet-visible absorption spectrum(UV-vis). The results showed that TiO2 could be attached on the surface of g-C3N4 well. The doping ratio 1:9 of C3N4 and TiO2 showed the highest photocatalytic activity on the degradation of IBU due to the red-shift of the catalyst. The photocatalytic degradation of IBU followed pseudo-first-order kinetics. Acidity increased the photocatalytic degradation of IBU. The quenching experiment demonstrated that the contribution rate of ·OH was 73.7%, indicating that ·OH played a major role in the photocatalytic degradation of IBU.
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