Efficient Photocatalytic Degradation of Methylene Blue Dye from Aqueous Solution with Cerium Oxide Nanoparticles and Graphene Oxide-Doped Polyacrylamide.

Content Provider	Europe PMC
Author	Kalaycıoğlu, Zeynep Özuğur Uysal, Bengü Pekcan, Önder Erim, F. Bedia
Copyright Year	2023
Abstract	A cerium oxide nanoparticles (CeO2-NPs)/grapheneoxide(GO)/polyacrylamide (PAM) ternary composite was synthesized throughfree-radical polymerization of acrylamide in the presence of CeO2 nanoparticles and GO in an aqueous system. The synthesizedcomposite material was characterized by X-ray diffraction (XRD), Fouriertransform infrared (FTIR) spectroscopy, scanning electron microscopy(SEM), and energy-dispersive X-ray (EDX) spectroscopy techniques andapplied for the photocatalytic degradation of methylene blue (MB)dye from an aqueous solution. Tauc’s model for direct transitionwas used to model for the optical band gap. The key operating parameterssuch as the amounts of CeO2-NPs and GO, pH, initial MBconcentration, type of light irradiation, and contact time have beenoptimized to achieve the highest MB degradation percentage. The photocatalysisprocess was pH-dependent, and the optimum pH value was found to be12.0. Under UV-A light, 90% dye degradation occurred in 90 min. Thedegradation of MB was also specified in terms of total organic carbon(TOC) and chemical oxygen demand (COD). Free-radical capture experimentswere also performed to determine the role of radical species duringthe photocatalytic oxidation process. The photocatalytic process showedthat the equilibrium data is in good agreement with the Langmuir–Hinshelwoodkinetic model. A rate constant of 0.0259 min–1 wasobtained. The hydrogel was also tested to assess its reusability,which is an important key factor in practical wastewater treatment.The photocatalytic activity only decreased to 75% after nine uses.
Journal	ACS Omega
Volume Number	8
PubMed Central reference number	PMC10099124
Issue Number	14
PubMed reference number	37065069
e-ISSN	24701343
DOI	10.1021/acsomega.3c00198
Language	English
Publisher	American Chemical Society
Publisher Date	2023-03-29
Access Restriction	Open
Rights License	Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). © 2023 The Authors. Published by American Chemical Society
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering