Computationally guided synthesis of (2D/3D/2D) rGO/Fe2O3/g-C3N4 nanostructure with improved charge separation and transportation efficiency for degradation of pharmaceutical molecules

• Published in: Applied catalysis. B, Environmental Vol. 255; p. 117758
• Main Authors: Shanavas, Shajahan, Mohana Roopan, Selvaraj, Priyadharsan, Arumugam, Devipriya, Duraipandi, Jayapandi, Selvam, Acevedo, Roberto, Anbarasan, Ponnusamy Munusamy
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.10.2019; Elsevier BV
• Subjects: Carbon nitride; Charge efficiency; Charge transfer; Ciprofloxacin; Degradation; Degradation intermediates; Efficiency; Electron migration; Embedding; Heterojunctions; Hydrothermal; Mapping; Migration; Nanochannels; Nanocomposites; Nanoparticles; Nanostructure; Optimization; Pharmaceutical condemnations; Pharmaceuticals; Photocatalysis; Photodegradation; Recyclability; Response surface methodology; Separation; Synergistic effect; Transportation; X ray photoelectron spectroscopy; Electron migration; Response surface methodology; Degradation intermediates; Pharmaceutical condemnations; Hydrothermal
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2019.117758

[Display omitted] •The 3D/2D Fe2O3/g-C3N4 nanocomposite was optimized by various concentrations of Fe2O3 in g-C3N4.•The optimization of rGO concentration in 2D/3D/2D rGO/Fe2O3/g-C3N4 the support of RSM methodology.•The formation of this 2D/3D/2D heterojunction drastically inhibited the recombination rate of photoexcited charge carriers.•The 3% of rGO in 4% Fe2O3/g-C3N4 nanocomposite exhibited larger photocatalytic ability against tetracycline and ciprofloxacin.•The prime intermediates formed during the photocatalytic degradation reaction of CP molecules examined by LC-TOF/MS analysis. In this study, we designed and successfully prepared all solid state 2D/3D/2D rGO/Fe2O3/g-C3N4 nanocomposite by embedding 3D Fe2O3 nanoparticles on 2D g-C3N4 nanosheets to for 3D/2D Fe2O3/g-C3N4 followed by the addition of 2D rGO nanosheets via a simple hydrothermal technique with the support of response surface methodology for the first time. The formation of this unique 2D/3D/2D heterojunction leads to generate several nanochannels in their interfacial contact for high-speed photoinduced charge transfer. The considerable enhancement in photoinduced charge transportation and migration efficiency resulted in significant visible-light-driven degradation of emerging pharmaceutical condemnations. The 3D/2D Fe2O3/g-C3N4 nanocomposite was optimized by various concentrations of Fe2O3 in g-C3N4, followed by the optimization of rGO concentration in 2D/3D/2D rGO/Fe2O3/g-C3N4 nanocomposite to obtain maximum degradation efficiency. We observed that the 3% of rGO in 4% Fe2O3/g-C3N4 nanocomposite exhibited superior photocatalytic ability, nearly 22 times and 16 times higher than pristine g-C3N4 nanosheets towards tetracycline and ciprofloxacin degradation, respectively. The synergistic effect between 2D/3D/2D g- rGO/Fe2O3/g-C3N4 nanocomposites and the photocatalytic mechanism was well studied through various characterization techniques like XRD, FTIR, SEM-EDX-mapping, HR-TEM, UV–vis DRS, PL, XPS and EPR. In addition, the 2D/3D/2D rGO/Fe2O3/g-C3N4 nanocomposite exhibits excellent recyclability and stability, establishing a promising application in environmental remediation. This research would provide a noteworthy platform for the extensive photocatalytic properties of 2D/3D/2D heterojunction nanocomposite system with enhanced charge migration and separation.