Photocatalytic degradation of phenol using Ag core-TiO2 shell (Ag@TiO2) nanoparticles under UV light irradiation

Abstract

Ag@TiO nanoparticles were synthesized by one pot synthesis method with postcalcination. These nanoparticles were tested for their photocatalytic efficacies in degradation of phenol both in free and immobilized forms under UV light irradiation through batch experiments. Ag@TiO nanoparticles were found to be the effective photocatalysts for degradation of phenol. The effects of factors such as pH, initial phenol concentration, and catalyst loading on phenol degradation were evaluated, and these factors were found to influence the process efficiency. The optimum values of these factors were determined to maximize the phenol degradation. The efficacy of the nanoparticles immobilized on cellulose acetate film was inferior to that of free nanoparticles in UV photocatalysis due to light penetration problem and diffusional limitations. The performance of fluidized bed photocatalytic reactor operated under batch with recycle mode was evaluated for UV photocatalysis with immobilized Ag@TiO nanoparticles. In the fluidized bed reactor, the percentage degradation of phenol was found to increase with the increase in catalyst loading.

Photocatalytic degradation of phenol by LaFeO3 nanocrystalline synthesized by gel combustion method via citric acid route

“…In the meantime, as pH increases, the extent of removal decreases at pH 6 (36% removal) and pH8 (25.5% removal). Same behavior is found by Shet and Shetty [20] when Ag core-TiO 2 shell nanoparticles was used in photocatalytic degradation of phenol mediated by visible light. Increasing the pH of phenol solution will reduces the protonation of the LaFeO 3 nanocrystalline's surfaces, repelling the adsorption of phenol onto the surfaces as both are negatively charged, and eventually reducing phenol degradation [3].…”

Strategy for Multifunctional Hollow Shelled Triple Oxide Mn–Cu–Al Nanocomposite Synthesis via Microwave-Assisted Technique

“…For the lower concentration of IC (20 ppm), the degradation rate has observed to be very fast. At higher concentrations, the number of available sites of the catalysts is blocked by IC, which results in a decreased photocatalytic surface area; therefore, the degradation efficiency also decreases. , …”

Potential use of foundry sand and furnace blast sand for fabrication of visibly active composite to promote circular economy/waste management for treating real agro‐industrial wastewater

“…The explanation for this could be that with fewer beads, there were less active sites were present but with increasing catalyst surface area the graph started incrementing as sufficient active sites were provided (Puri et al, 2021; Yang et al, 2019). Increasing beads beyond >100% might offer large catalyst surface area, but overlapping of beads resulted in the capping of the active sites and caused problems in sufficient light penetration and hindered the binding of pollutant to the composite, which is important for reaction, hence reduction of catalyst active sites caused decrement in the % color and % COD removal (Idris et al, 2012; Shet & Shetty, 2016).…”