Fig. 7. Photocatalytic activity of the materials: (a) photocatalytic tetracycline degradation of the materials under visible light irradiation. (b) Photocatalytic tetracycline degradation of the materials under visible light irradiation with PMS activation. (c) Change of pH value. (d) Tetracycline mineralization. (e) Free radical trapping studies of the 10% WO3/diatomite composite, and (f) stability of the 10% WO3/diatomite composite for five repeated photocatalytic runs.
