CeO₂mediated photocatalytic degradation studies of C.I. acid orange 7

Abstract

CeO2 nanoparticles were prepared by a simple precipitation method, followed by calcination treatment. By selecting photocatalytic degradation of acid orange 7 (AO7) as a probe reaction, the influences of calcination temperature of catalyst, the concentration of AO7, initial pH value of AO7 solution and catalyst dosage on the photocatalytic activity of CeO2 were studied. It was found that CeO2 calcined at 550 degrees C shows the highest photocatalytic activity under visible light irradiation. It was revealed that under visible light irradiation the degradation of AO7 over CeO2 nanoparticles follows a dye self-sensitization mechanism. The degradation rate of AO7 increases with decrease in the initial pH value of the reaction solution, and degradation efficiency decreases with increase in the initial dye concentration. The optimal dosage of CeO2 in solution for AO7 degradation is 1 g/L.

Solvothermal synthesis of three‐dimensional CeO2 micropillows and their photocatalytic property

“…The apparent rate constant of the CeO 2 micropillows estimated from the slope of a plot ln ( A 0 / A t ) versus t is 0.238 h –1 . The degradation rate of the CeO 2 micropillows is 87%, which is much higher than in reported literature 7, 10.…”

“…Cerium oxide (CeO 2 ), a functional rare earth oxide with unique physical and chemical properties, has received greatest attention due to its extensive applications in environmental and energy related fields, gas sensors, ultraviolet (UV) blockers, oxygen storage capacitors, polishing materials, solid oxide fuel cells 3–6. Moreover, CeO 2 is an economical and relatively non‐toxic material similar to ZnO or TiO 2 and has been considered as an alternate material for the application in photocatalyst and photovoltaic cells 7–10. Recently, three‐dimensional (3D) micro or nanostructured materials derived from self‐assembly of nanoscale building blocks have significantly motivated the scientific attention due to their unique and novel functional properties 11, 12.…”

Nanostructured CeO2 photocatalysts: optimizing surface chemistry, morphology, and visible-light absorption

“…Organic dyes such as methylene blue (MB), methyl orange (MO), or acid orange 7 (AO7) are often used as general probes of photocatalytic decontamination activity. Various CeO 2 nanostructures, including nanowires 89 and nanoparticles 90,91 degrade these dyes under UV excitation. These studies generally implicate ROS photogenerated through CB electrons or VB holes in destruction of the dye molecules.…”

Modulated heterogeneous Fenton-like activity of ‘M’ doped nanoceria systems (M = Cu, Fe, Zr, Dy, La): Influence of reduction potential of doped cations

“…The difficulties associated with recyclability and removal of the catalyst holds back its commercial application for waste water treatment. As an ambient catalytic reaction, a heterogeneous Fenton -like oxidation on pure and modified ceria nanoparticles was attempted by researchers due to its merits over homogeneous catalysis [13,14]. In depth investigations of ceria/H 2 O 2 Fenton-like system revealed that the production of hydroxyl radicals mainly depends on the nature of the oxide surface.…”