Photocatalytic degradation of methylene blue with spent FCC catalyst loaded with ferric oxide and titanium dioxide

Abstract

The spent fluid catalytic cracking (FCC) catalyst has been loaded with ferric oxide (Fe 2 o 3) and titanium dioxide (TiO 2). Fe-Ti/SF composite (loaded with 5 wt% TiO 2 and 5 wt% Fe 2 o 3), Fe/SF composite (loaded with10 wt% Fe 2 o 3) and Ti/SF composite (loaded with 10 wt% TiO 2) have been fabricated via a modified-impregnation method. The band gaps of the Fe-Ti/SF, Fe/SF and Ti/SF composites (evaluated by the energy versus [F(R∞)hv] n) are 2.23, 1.98 and 3.0 eV, respectively. Electrochemical impedance spectroscopy shows that the Fe-Ti/SF has lower electron transfer resistance, it has the small charge transfer resistance and fast charge transfer rate. The interparticle electrons transfer between the fe 2 o 3 and tio 2 , which can improve the separation of the photo-electrons and holes. The holes transfer from valence band of TiO 2 to the valence band of Fe 2 o 3 , which can provide more active sites around the adsorbed molecules. The methylene blue degradation efficiencies (with the Fe-Ti/SF, Fe/SF and Ti/ SF composites) are ~ 94.2%, ~ 22.3% and ~ 54.0% in 120 min, respectively. This work reveals that the spent fcc catalyst as supporter can be loaded with fe 2 o 3 and tio 2. This composite is highly suitable for degradation of methylene blue, which can provide a potential method to dispose the spent FCC catalyst in industry.

Antimicrobial Activity of a Titanium Dioxide Additivated Thermoset

“…After UV irradiation at 50 W/m 2 for 10 min and subsequent centrifugation of the solution to remove the TiO 2 particles, a colorless liquid was observed. This could be also detected in the UV-Vis spectrum: the addition of TiO 2 to the MB solution and the UV irradiation resulted in a decrease in the absorption peak at 610 nm and 663 nm, which is also consistent with other studies [58,59]. With increasing irradiation time, the absorption in this wavelength range decreased close to 0 a.u., which could explain the colorless appearance of the solution.…”

Functional impacts of polyaniline in composite matrix of photocatalysts: an instrumental overview

“…148 The new absorption at distinct wavelengths identied from the spectra revealed the formation of new composites with distinct band gaps. 4,150 In the instrumental elucidation by Sarmah and Kumar, 139 they further observed a characteristic peak at 430 nm, indicating the p bandpolaron band of protonated PANI chains, while the peak at 840 nm indicates the polaron band p* of doped PANI. 25 The features revealed by the spectra indicate the presence of a single broad polaronic band deep in PANI stabilized by the coulombic interactions, dielectric screening and local disorder in the polyaniline.…”

FeOOH Quantum Dot-Coupled Z-Scheme BiVO4/g-C3N4 Heterojunction for Enhancing Photo-Fenton Reactions

“…Advanced oxidation processes (AOPs) are technological approaches that use strongly oxidizing radicals (mostly OH radicals) to degrade organic pollutants and are broadly defined as chemical oxidation techniques. − The photo-Fenton process is an inexpensive, simple, environmentally friendly, and efficient method commonly used to treat difficult-to-degrade organic pollutants. − However, the process has many problems that limit its practical application, such as high H 2 O 2 demand, poor recoverability, and low conversion efficiency between Fe 3+ and Fe 2+ . The use of one advanced oxidation technology alone often does not achieve good treatment results, especially for environmentally complex treatment of actual antibiotics. , Combined advanced oxidation technologies can reduce the need for H 2 O 2 and shorten the reaction time.…”