In Situ Fenton Reagent Generated from TiO₂/Cu₂O Composite Film:  a New Way to Utilize TiO₂ under Visible Light Irradiation

Abstract

TiO2/Cu2O composite is prepared by a simple electrochemical method and coated on glass matrix through a spraying method. The obtained composite is characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effect of TiO2/Cu2O composite films with different ratio of TiO2 and Cu2O on photodegradation of the dye methylene blue under visible light is investigated in detail. It is found that the photocatalytic activity of TiO2/Cu2O composite film with the presence of FeSO4 and EDTA is much higher than that for the similar system with only TiO2 and Cu2O film respectively. Without the presence of FeSO4 and EDTA, there is no degradation for methylene blue. The exploration of the optimized parameters for the degradation of methylene blue by using TiO2/Cu2O composite film as catalyst under visible light was also carried out. The most significant factor is the amount of Ti02 in the composite, and the second significant factor is the concentration of FeSO4. During the degradation of methylene blue under visible light, TiO2/Cu2O composite film generates H202, and Fenton regent is formed with Fe2+ and EDTA, which is detected in this study. The mechanism for the great improvement of photocatalytic activity of TiO2/Cu2O composite film under visible light is proposed by the valence band theory. Electrons excitated from TiO2/Cu2O composite under visible light are transferred from the conduction band of Cu2O to that of Ti02. The formed intermediate state of Ti 3+ ion is observed by X-ray photoelectron spectroscopy (XPS) on the TiO/Cu2O composite film. Additionally, the accumulated electrons in the conduction band of TiO2 are transferred to oxygen on the TiO2 surface for the formation of O2- or O2(2-), which combines with H+ to form H2O2. The evolved H202 with FeSO4 and EDTA forms Fenton reagentto degrade methylene blue. Compared to the traditional Fenton reagent, this new kind of in situ Fenton reagent generated from TiO2/Cu2O composite film does not need to supply H202. It is expected to be easily recycled, which may reduce second pollution and the cost of wastewater treatment. Moreover, this TiO/Cu2O composite film with FeSO4 and EDTA provides a new way to take advantage of TiO2 under visible light.

A Study of Low-Temperature CO Oxidation over Mesoporous CuO-TiO2 Nanotube Catalysts

“…For CuO-TiO 2 NTs, the O 1s peak broadens and shifts from 529.6 eV to 529.3 eV. Additionally, a weak shoulder peak is observed at 531.5 eV, which can be attributed to the adsorbed oxygen anions in the (OH-) groups on the surface [35,36] or to the oxygen in CuO [40]. The binding energies of the Cu 2+ XPS peaks are slightly higher for CuO supported on TiO 2 NTs compared to the unsupported CuO nanoparticles, as shown in Figure 5c.…”

Electrochemical-Thermal Modelling and Optimisation of Lithium-Ion Battery Design Parameters Using Analysis of Variance

“…A statistical model is developed by ANOVA of the numerical data in a full factorial design framework [35][36][37][38][39]. ANOVA is primarily designed for the analysis of experimental data.…”

Fenton degradation of 4-chlorophenol using H2O2in situ generated by Zn-CNTs/O2 system

“…, the 4-CP removal efficiency was 75.6% and 98.8%, respectively. This can be explained by the Fenton reaction (9), in which Fe 2+ ions promoted H 2 O 2 decomposition and increased the production of cOH. , the 4-CP removal efficiency decreased from 98.3% to 73.5%, suggesting that an excess of iron was detrimental to the degradation of 4-CP because excess iron would consume cOH (eqn (10) …”