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Saed, Usama Akram
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Chemical Engineering, Chemistry & Bioengineering Chemistry

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Enhanced Adsorption of Brilliant Green Dye Using Barium Ferrite/Graphene Oxide Nanocomposites Saed, Usama Akram; Ali, Alaa H.; Saoud, Ammar A.; Zeitoun, Zeyad
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 4 Year 2025 (December 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20453

Abstract

This study presents the synthesis and characterization of barium ferrite/graphene oxide (BaFeO/GO) nanocomposites for the adsorption of brilliant green dye (BGD) from aqueous solutions. BaFeO/GO nanocomposites were fabricated via a co-precipitation method with varying GO content (10-30 wt%), and characterized using Fourier Transform Infra rEd (FTIR), X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Field-Emission Scanning Electron Microscopy (FESEM), Transmission Electron Microscope (TEM), Brunauer, Emmett, and Teller (BET), and Vibrating Sample Magnetometer (VSM) techniques. The incorporation of GO enhanced the surface area, reduced BaFeO nanoparticle agglomeration, and introduced additional oxygen-containing functional groups, significantly improving the adsorption performance. Batch adsorption experiments were conducted to evaluate the effects of pH, contact time, adsorbent dose, and initial dye concentration. The maximum dye removal efficiency reached 98.9% with the BaFeO/30%GO composite. Kinetic studies showed excellent agreement with the pseudo-second-order model, while adsorption isotherm analysis indicated that the Langmuir model best fit the equilibrium data, suggesting monolayer adsorption. These results demonstrate the potential of BaFeO/GO nanocomposites as efficient, magnetically separable adsorbents for the removal of cationic dyes from wastewater. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Visible-Light Photocatalytic Degradation of Metronidazole Using Bismuth Oxide-Doped Erbium Oxide Anchored Graphene Oxide Nanocomposites: Kinetics and Mechanism Ali, Nada D.; Saed, Usama Akram; Abdulnabi, Waqar A.; Zeitoun, Zeyad
Bulletin of Chemical Reaction Engineering & Catalysis 2026: BCREC Volume 21 Issue 3 Year 2026 (October 2026) (Issue in Progress)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20651

Abstract

Metronidazole (MNZ) is a persistent pharmaceutical contaminant that resists conventional wastewater treatment. In this work, a visible-light-active Bi2O3–Er2O3/graphene oxide (GO) nanocomposite was synthesized by a co-precipitation method.  This nanocomposite was evaluated for the photocatalytic degradation of MNZ in aqueous solution. Structural and optical characterization (XRD, FTIR, SEM, TEM, BET, PL, and UV–Vis DRS) confirmed the successful anchoring of Bi2O3–Er2O3 nanoparticles onto GO sheets. That resulted in improved visible-light absorption and blocked charge-carrier recombination. The composite containing 20 wt% GO showed the highest photocatalytic activity. It achieved near-complete MNZ removal under exposure to visible light. The improved performance was attributed to the combined effects of many factors. Those include Bi2O3–Er2O3-induced visible-light response, Er2O3-assisted charge trapping, and efficient electron transport through GO. The study included examining the effects of many factors. Those included the solution pH, catalyst dosage, initial MNZ concentration, and GO content. Optimal degradation was found in alkaline conditions. The catalyst was found to be stable and reusable. Therefore, it has high potential for sustainable antibiotic removal from wastewater. Copyright © 2026 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Co-Authors Abdulnabi, Waqar A. Ali, Alaa H. Ali, Nada D. Saoud, Ammar A. Zeitoun, Zeyad