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J. Korean Ceram. Soc. > Volume 60(2); 2023 > Article
Journal of the Korean Ceramic Society 2023;60(2): 293-300.
doi: https://doi.org/10.1007/s43207-022-00263-4
Improved photocatalytic degradation efficiency of methylene blue via MgAl2O4–graphene nanocomposite
Ahmed Ali, Iftikhar Hussain Gul, Muhammad Zarrar Khan, Farhan Javaid
School of Chemical and Materials Engineering (SCME), National University of Sciences and Technology (NUST), H-12, Islamabad 44000, Pakistan
Correspondence  Farhan Javaid ,Email: farhan.javaid@scme.nust.edu.pk
Received: June 23, 2022; Revised: October 22, 2022   Accepted: November 14, 2022.  Published online: November 29, 2022.
In the present work, Magnesium Aluminate (MgAl2O4) nanoparticles and MgAl2O4–graphene nanocomposites with various graphene weight percentages (1, 2, 3, 4, and 5%) were prepared via sol–gel and ultra-sonication methods, respectively. The formation of the spinel phase was confirmed through XRD analysis. Scanning Electron Microscopy was used to study the morphology of the MgAl2O4 nanoparticles and their anchoring on the graphene sheets. The FTIR analysis also confirmed the presence of tetrahedral and octahedral bands at 695 and 526 cm−1, respectively. For magnesium aluminate nanoparticles, the bandgap was calculated to be 5.4 eV, which decreases to 4.9 eV with 5% graphene loading on the MgAl2O4–graphene nanocomposites. For methylene blue dye, the degradation efficiency of the 5% MgAl2O4–graphene nanocomposites was also found to be higher (90%) as compared to the pristine MgAl2O4 nanoparticles (70%). This increase in effiiency depicts their enhanced photocatalytic activity and strongly suggests that the MgAl2O4–graphene nanocomposites could be a good candidate for industrial wastewater remediation.
Key words: Magnesium aluminate · Graphene nanocomposite · Sol–gel · Ultra-sonication · Photocatalytic activity
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