Degradation of methyl orange by TiO₂/polymeric film photocatalyst

Abstract

Degradation of methyl orange (MeO), as a model compound, in the presence of immobilized polymeric titanium dioxide (TiO2) catalyst was investigated. Degussa P25 TiO2, Polyvinyl alcohol, and Polyvinylpyrolidone were used to prepare polymeric film immobilized photocatalyst. The photocatalyst pore size varied between 50 and 300 µm while its pore density ranged from 7 to 10 pores per square mm. Adsorption of MeO over the catalyst film followed the Langmuir adsorption isotherm. The degradation kinetics of MeO followed the well‐known Langmuir–Hinshelwood (L–H) type model. The degradation rate increased at higher initial concentrations while flow rate had a negative impact on the degradation rate. pH of the solution influenced the degradation rate, with higher degradation rates observed in acidic solutions. Degradation rate was also increased with increasing light intensity up to a certain level, beyond which it remained almost unchanged. Total organic carbon (TOC) content of MeO was also measured during the degradation process. It was observed that the TOC decreased substantially with time. The degradation efficiency was 85 %.

Engineering Commercial TiO2 Powder into Tailored Beads for Efficient Water Purification

“…To prove the efficiency of the proposed engineered photocatalysts, the obtained results are presented in comparison with the photocatalytic performance reported in the literature for Degussa P25 TiO 2 -based photocatalytic systems, in the form of film/coating or slurry ( Table 4 ). At this point, it should be mentioned that the light intensity is a decisive parameter when attempting to benchmark photocatalytic systems, as it rules the amount of the generated electron-hole pairs [ 53 , 54 ]. Thus, apart from the amount of the catalysts and the concentration of the solutions used, Table 4 also contains details about the irradiation parameters applied in every study.…”

A corrugated plate photocatalytic reactor for degradation of waterborne organic contaminants

“…By substituting Equations (13), (14), and (16)- (18) into Equation (15), and with the given values of the lamp and reactor plates, the light intensity at a specific point can be obtained. By integrating across the plate surface, the total absorbed power by one plate can be calculated and the intensity distribution across the surface can be plotted.…”

“…Different types of UV photocatalytic reactors have been designed to degrade organic molecules in air and water . Due to the surface reactions, the reactor should be configured for optimum mass transfer of oxygen, reactant, and product .…”

“…[7] Different types of UV photocatalytic reactors have been designed to degrade organic molecules in air and water. [7,[15][16][17][18][19] Due to the surface reactions, the reactor should be configured for optimum mass transfer of oxygen, reactant, and product. [7] In order to achieve these requirements, photocatalytic reactors with angled plates have been proposed, as they can accommodate more catalyst surface under a given illuminated area and absorb photon energy more effectively.…”

Photocatalytic Activity of Aeroxide TiO2 Sensitized by Natural Dye Extracted from Mangosteen Peel

“…High stability, corrosion resistance, non-toxicity, excellent optical transparency, and low cost of TiO 2 makes it one of the most widely used photocatalysts for water decontamination [1]. To date, it has been vastly studied for the removal of toxic organic pollutants [2][3][4], metal ion reduction [5], and degradation of emerging pollutants [1]. However, the wide bandgap of TiO 2 (~3.2 eV) makes the photocatalysis processes UV light-driven only [6][7][8].…”