Enhanced photocatalytic degradation of methylene blue dye using eco-friendly synthesized rGO@ZnO nanocomposites

Negash, Asfaw; Mohammed, Said; Weldekirstos, Hulugirgesh Degefu; Ambaye, Abera D.; Gashu, Minbale

doi:10.1038/s41598-023-48826-7

Cited by 18 publications

(5 citation statements)

References 56 publications

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“… ZOI (mm) Refs. ZnO NPs 96.5 100 15 71 12 for E. coli 72 CuO NPs 61 120 10 73 14.3 ± 0.5 for S. aureus 74 CeO 2 NPs 77 210 12.5 75 3.33 ± 0.33 for P. aeruginosa 76 N-ZrO 2 NPs 59 240 5 77 – – GO-15/CeO 2 100 120 20 Present work 11.24 ± 0.14 Present work …”

Section: Resultsmentioning

confidence: 89%

Antibacterial and sunlight-driven photocatalytic activity of graphene oxide conjugated CeO2 nanoparticles

Fauzia,

Khan,

Chaman

et al. 2024

Sci Rep

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This work focuses on the structural, morphological, optical, photocatalytic, antibacterial properties of pure CeO2 nanoparticles (NPs) and graphene oxide (GO) based CeO2 nanocomposites (GO-1/CeO2, GO-5/CeO2, GO-10/CeO2, GO-15/CeO2), synthesized using the sol–gel auto-combustion and subsequent sonication method, respectively. The single-phase cubic structure of CeO2 NPs was confirmed by Rietveld refined XRD, HRTEM, FTIR and Raman spectroscopy. The average crystallite size was calculated using Debye Scherrer formula and found to increase from 20 to 25 nm for CeO2 to GO-15/CeO2 samples, respectively. The related functional groups were observed from Fourier transform infrared (FTIR) spectroscopy, consistent with the outcomes of Raman spectroscopy. The optical band gap of each sample was calculated by using a Tauc plot, which was observed to decrease from 2.8 to 1.68 eV. The valence state of Ce (Ce3+ and Ce4+) was verified using X-ray photoelectron spectroscopy (XPS) for CeO2 and GO-10/CeO2. The poisonous methylene blue (MB) dye was used to evaluate the photocatalytic activity of each sample in direct sunlight. The GO-15/CeO2 nanocomposite showed the highest photocatalytic activity with rate constant (0.01633 min–1), and it degraded the MB dye molecules by 100% within 120 min. The high photocatalytic activity of this material for degrading MB dye establishes it as an outstanding candidate for wastewater treatment. Further, these nanocomposites also demonstrated excellent antimicrobial activity against Pseudomonas aeruginosa PAO1.

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Section: Resultsmentioning

confidence: 89%

Antibacterial and sunlight-driven photocatalytic activity of graphene oxide conjugated CeO2 nanoparticles

Fauzia,

Khan,

Chaman

et al. 2024

Sci Rep

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“…This charge carrier separation reduces recombination. Moreover, changes in the work functions of GO and ZnO facilitated electron acceptance from ZnO, further minimizing charge recombination . Consequently, the surplus charge carriers reached the surface of GO/g-C 3 N 4 /ZnO, where they plausibly engaged with water to generate hydroxyls and radicals .…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, changes in the work functions of GO and ZnO facilitated electron acceptance from ZnO, further minimizing charge recombination. 52 Consequently, the surplus charge carriers reached the surface of GO/g-C 3 N 4 /ZnO, where they plausibly engaged with water to generate hydroxyls and radicals. 53 The ensuing interaction with MB led to an amplified degradation of the dye, highlighting the efficiency of the photocatalytic process.…”

Section: Resultsmentioning

confidence: 99%

Enhancing the Photocatalytic Degradation of Methylene Blue with Graphene Oxide-Encapsulated g-C₃N₄/ZnO Ternary Composites

Shakoor,

Jilani

et al. 2024

ACS Omega

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Methylene blue (MB) is a toxic contaminant present in wastewater. Here, we prepared various composites of graphene oxide (GO) with graphitic carbon nitride (g-C 3 N 4 ) and zinc oxide (ZnO) for the degradation of MB. In comparison to ZnO (22.9%) and g-C 3 N 4 /ZnO (76.0%), the ternary composites of GO/g-C 3 N 4 / ZnO showed 90% photocatalytic degradation of MB under a light source after 60 min. The experimental setup and parameters were varied to examine the process and effectiveness of MB degradation. Based on the results of the experiments, a proposed photocatalytic degradation process that explains the roles of GO, ZnO, and g-C 3 N 4 in improving the photocatalytic efficacy of newly prepared GO/g-C 3 N 4 /ZnO was explored. Notably, the g-C 3 N 4 /ZnO nanocomposite's surface was uniformly covered with ZnO nanorods. The images of the samples clearly demonstrated the porous nature of GO/g-C 3 N 4 /ZnO photocatalysts, and even after being mixed with GO, the g-C 3 N 4 /ZnO composite retained the layered structure of the original material. The catalyst's porous structure plausibly enhanced the degradation of the contaminants. The high-clarity production of g-C 3 N 4 and the effectiveness of the synthesis protocol were later validated by the absence of any trace contamination in the energy-dispersive X-ray spectroscopy (EDS) results. The composition of the ZnO elements and their spectra were revealed by the EDS results of the prepared ZnO nanorods, g-C 3 N 4 /ZnO, and GO/g-C 3 N 4/ ZnO. The outcomes indicated that the nanocomposites were highly uncontaminated and contained all necessary elements to facilitate the transformative process. The results of this experiment could be applied at a large scale, thus proving the effectiveness of photocatalysts for the removal of dyes.

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“…Hussain et al [46] biosynthesized olive fruit extract-based zinc oxide (ZnO@OFE) NPs and achieved 75% and 87% photocatalytic degradation of MB and methyl orange (MO) under sunlight irradiation within 180 min. Negash et al [47] synthesized reduced graphene oxide (rGO), zinc oxide (ZnO), and reduced graphene oxide-zinc oxide (rGO@ZnO) to achieve efficient photodegradation of MB. The photocatalytic degradation of MB was performed using direct sunlight irradiation.…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of Methylene Blue Using a UV/H2O2 Irradiation System

Ali,

Maafa,

Qudsieh

2024

Water

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This study presents an efficient way to degrade methylene blue (MB) present in water via photodegradation using H2O2 as an oxidant in the presence of UV irradiation and without the use of a catalyst. The reaction variables, employed to evaluate the performance of the photodegradation process using the UV/H2O2 system, were the amount of H2O2 in the reacting solution and the initial concentration of methylene blue. The degradation of methylene blue in the presence of H2O2 was not observed during agitation in darkness. The degradation time decreased as the H2O2 concentration increased after the ideal concentration was reached. At this stage, as it began to scavenge the generated hydroxyl radicals, the rate of degradation became inversely proportional to the concentration of H2O2. An increase in the quantities of MB and H2O2 improved the degradation efficiency because the oxidation process was aided by using the appropriate amount of H2O2 and an ideal length of UV light exposure. The experimental data obtained were well-fitted to zero-order reaction kinetics based on the high values of the correlation coefficient. It is believed that the OH radicals (OH●) generated during the breakdown of H2O2 and the generated O2●− species attack the MB molecules and produce MB radicals (MB●). These MB radicals further experience oxidation and convert to intermediates and finally to CO2 and H2O. The UV/H2O2 system proved to be quite efficient for the photodegradation of methylene blue without the use of any solid catalyst. This UV/H2O2 system can be employed in the degradation of other organic pollutants in industrial wastewater.

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Enhanced photocatalytic degradation of methylene blue dye using eco-friendly synthesized rGO@ZnO nanocomposites

Cited by 18 publications

References 56 publications

Antibacterial and sunlight-driven photocatalytic activity of graphene oxide conjugated CeO2 nanoparticles

Antibacterial and sunlight-driven photocatalytic activity of graphene oxide conjugated CeO2 nanoparticles

Enhancing the Photocatalytic Degradation of Methylene Blue with Graphene Oxide-Encapsulated g-C₃N₄/ZnO Ternary Composites

Photodegradation of Methylene Blue Using a UV/H2O2 Irradiation System

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Enhanced photocatalytic degradation of methylene blue dye using eco-friendly synthesized rGO@ZnO nanocomposites

Cited by 18 publications

References 56 publications

Antibacterial and sunlight-driven photocatalytic activity of graphene oxide conjugated CeO2 nanoparticles

Antibacterial and sunlight-driven photocatalytic activity of graphene oxide conjugated CeO2 nanoparticles

Enhancing the Photocatalytic Degradation of Methylene Blue with Graphene Oxide-Encapsulated g-C3N4/ZnO Ternary Composites

Photodegradation of Methylene Blue Using a UV/H2O2 Irradiation System

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Enhancing the Photocatalytic Degradation of Methylene Blue with Graphene Oxide-Encapsulated g-C₃N₄/ZnO Ternary Composites