Th (nm)16 14b-Fe2O3/WO3.5H2OFe3O(hv)two(eV)10 eight 6 four 2 0 1.two.2.3.3.Photo energy (eV)Figure 5. (a) UV-Vis diffuse reflectance spectrum of Fe3 O4 and -Fe2 O3 /WO3 .5H2 O; (b) (h)two Figure five.versus hv curves QX-314 In Vitro ofreflectance spectrum of Fe.5H O. (a) UV-Vis diffuse Fe O and -Fe O /WO 3O4 and -Fe2O3/WO3.5H2O; (b) (h)2 ver3 4 2 three 3 two sus hv curves of Fe3O4 and -Fe2O3/WO3.5H2O.The catalytic activities in the complicated were measured by the photodegradation of RhB Rhodamine B (RhB) Following eachto simulate pollutants in waterused for the following photocatalytic for 5 recycles. was utilised cycle, fresh RhB solution was under UV-Visible light at room experiment. Additionally, 3.5H2O was dispersed, plus the absorption spectrum temperature. -Fe2O3/WO the photocatalyst was collected from the previous experiment in the option was tested. The curve of absorbance in Figure 7 that the catalytic activity in followed by washing and drying. It is actually shown wavelength versus time is shown displayed Figure 6a. The intensity from the absorption recycles 553 nmperiod of 100 min. This indicates that no significant lower right after five peak at having a [64] steadily decreased with the increasestability of -Fe2 O3 /WO3 .5H2 O was blue shifted,itwhich indicated that the the in time, and the absorption peak is outstanding, and can keep its high photocatalytic ethyl onactivity right after the photocatalytic reaction and recycling process [32,68]. RHB molecule was removed. The Bisantrene web characteristic absorption peak of Rhodamine B could hardly be seen at one hundred min, and Rhodamine B was absolutely degraded.the separation of photo-generated electrons and hole pairs [67]. This can lessen the recombination probability and cut down the energy necessary for the transition, so it features a superior photocatalytic effect than single WO3 or -Fe2O3. Nonetheless, the lower removal efficiency as compared to the reported Fe2O3/WO3 may as a result of the water molecules in the structure Molecules 2021, 26,of -Fe2O3/WO3.5H2O.ten of0.a20min 40min 60min 80min 100min0.Absorbance (a.u.)0.0.0.0.0.0 500 550Wavelength (nm)by=a1-exp(-kx)) k=0.01297 R2=0.-Fe2O3/WO3.5H2ODecolorizationFe3Oy=a1-exp(-kx)) k=0.00822 R2=0.without having catalyst0 0 20 40 60 80Time (min)Figure six. (a) Absorption spectrum of RhB resolution of RhB presencein the presence of -FeO beneath three .5H2 O under Figure 6. (a) Absorption spectrum within the resolution of -Fe2O3/WO3.5H2 two O3 /WO UV-Visible light;UV-Visible light; (b) degrading efficiency at various timeswithout catalystswithout catalysts beneath (b) degrading efficiency at diverse instances with different or with a variety of or underUV-Visible light. The purple curve and yellow curve will be the pseudo-first-order models’ fitting curve.In conventional photocatalysts, the photoinduced electrons and holes migrate randomly, plus the recombination on the charge carriers reduces the quantum yield within the catalytic method. We can see in Figure 8 that when -Fe2 O3 (as the primary light absorber) forms a heterojunction with WO3 (as an electron acceptor), the band bending formed in the interface in between -Fe2 O3 and WO3 impels the carriers to diffuse in opposite directions until their Fermi levels reach equivalence [69]. As other studies have claimed that the CB edge possible of -Fe2 O3 (0.29 eV) is reduce than that of WO3 (0.79 eV) [32,70,71], upon irradiation, the ground-state -Fe2 O3 and WO3 visit an exited state to create some electron ole pairs as a result of their narrow band gaps. For that reason, the photo-excited electrons around the CB of -Fe2 O3 transferred to the CB of.