724095.fig.004a
(a)
724095.fig.004b
(b)
Figure 4: Effectiveness of investigated semiconductor oxides in photocatalytic phenol degradation. Experimental conditions: initial phenol concentration = 0.536 mM; catalyst concentration = 0.1 g·L−1; pH = 5.9;  K. (a) Variations of values during phenol photodegradation: 1—TiO2 P25; 2—TiO2; 3—ZnO; 4—WO3; 5—photolysis; 6—α-Fe2O3; (b) and values of phenol solution after reaction.