Effect of Co-pollutants on the Photocatalytic Activity of Fe doped ZnO Nanoparticles on the Degradation of Methylene Blue

Thambiliyagodage, Charitha; Lokuge, Nishadi

doi:10.1109/5nano53044.2022.9828918

Cited by 2 publications

(2 citation statements)

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“…The presence of NaCl also slowed down the rate of photodegradation of MB but only by 11% due to the clogging of active sites by Cl − ions [ 64 ]. The rate of photodegradation was reduced by 14% due to the co-existence of the PO 4 3− , as they paired with the positively charged MB molecules; three MB molecules (+1 charged) couple with one phosphate ion (−3 charged), neutralizing the overall charge of MB and hence reducing the interaction of dye molecules with the catalyst surface [ 65 ]. The variations in the rate constant in the presence of co-pollutants on the photodegradation of MB are stated in Table 6 .…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Naturally Derived Chitosan and Ilmenite Sand-Based TiO2/Fe2O3/Fe-N-Doped Graphitic Carbon Composite for Photocatalytic Degradation of Methylene Blue under Sunlight

et al. 2023

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Fabrication of chitosan and ilmenite sand-based novel photocatalysts through the catalytic graphitization of chitosan is reported. Nanocomposites consisted of TiO2, Fe2O3 and Fe nanoparticles dispersed on a nitrogen-doped graphitic carbon framework. The surface area, pore volume and macropore structure of the carbon matrix is disturbed by the heterogeneously distributed nanoparticles. The extent of graphitization expanded with increasing metal loading as indicated by variation in the ID/IG ratio. The nanomaterial’s surface consists of Fe3+ and Ti4+, and graphitic, pyridinic and pyrrolic nitrogen were found in the carbon matrix. The band gap values of the composites varied in the 2.06–2.26 eV range. The photocatalytic activity of the synthesized nanomaterials was determined, and the highest rate constant for the photodegradation of methylene blue under sunlight was 4.4 × 10−3 min−1, which resulted with 10 mg/L MB and 25 mg of the best-performing catalyst. The rate constant rose with increasing concentrations of persulfate added to the medium. The rate constant greatly diminished with the addition of isopropyl alcohol as it scavenged hydroxyl radicals. The presence of co-pollutants including Pb2+, rhodamine B, PO43− and Cl− curtailed the rate of reaction. The activity reduced with an increasing number of uses of the catalyst.

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Section: Resultsmentioning

confidence: 99%

Fabrication of Naturally Derived Chitosan and Ilmenite Sand-Based TiO2/Fe2O3/Fe-N-Doped Graphitic Carbon Composite for Photocatalytic Degradation of Methylene Blue under Sunlight

et al. 2023

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“…The antibacterial activity of both chitosan and ZnO NPs has been individually investigated before [13,14]. For instance, ZnO nanoparticles on one hand were recently synthesized and showed noteworthy photocatalytic activity in degrading methylene blue [15]. More recently, polyethyleneglycol-coated ZnO NPs were hydrothermally developed, and their potential antibacterial activity, presented by MIC and MBC, was evaluated against a set of Gram-negative and Gram-positive strains.…”

Section: Introductionmentioning

confidence: 99%

Introducing the antibacterial and photocatalytic degradation potentials of biosynthesized chitosan, chitosan-ZnO, and chitosan-ZnO/PVP nanoparticles

Aouadi,

Saoud,

Rebiai

et al. 2024

Preprint

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The development of nanomaterials has been speedily established in recent years, yet nanoparticles synthesized by traditional methods suffer unacceptable toxicity and the sustainability of the procedure for synthesizing such nanoparticles is inadequate. Consequently, green biosynthesis, which employs biopolymers, is gaining attraction as an environmentally sound alternative to less sustainable approaches. Chitosan-encapsulated nanoparticles exhibit exceptional antibacterial properties, offering a wide range of uses. Chitosan, obtained from shrimp shells, aided in the environmentally friendly synthesis of high-purity zinc oxide nanoparticles (ZnO NPs) with desirable features such as the extraction yield (41%), the deacetylation (88%), and the crystallinity index (74.54%). The particle size of ZnO NPs was 12 nm, while that of chitosan-ZnO NPs was 21 nm, and the bandgap energies of these nanomaterials were 2.5 and 2.3, respectively. The strong antibacterial action was demonstrated by ZnO NPs, chitosan-ZnO NPs, and chitosan-ZnO/PVP, particularly against Gram-positive bacteria, making them appropriate for therapeutic use. The photocatalytic degradation abilities were also assessed for all nanoparticles. At a concentration of 6×10− 5 M, chitosan removed 90.5% of the methylene blue (MB) dye, ZnO NPs removed 97.4%, chitosan-coated ZnO NPs removed 99.6%, while chitosan-ZnO/PVP removed 100%. In the case of toluidine blue (TB), at a concentration of 4×10− 3 M, the respective efficiencies were 96.8%, 96.8%, 99.5%, and 100%, respectively. Moreover, in sillico toxicity studies were conducted to predict the organ-specific toxicity through ProTox II software. The results from the three tested samples were completely safe and showed no organ-specific toxicity.

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Effect of Co-pollutants on the Photocatalytic Activity of Fe doped ZnO Nanoparticles on the Degradation of Methylene Blue

Cited by 2 publications

References 19 publications

Fabrication of Naturally Derived Chitosan and Ilmenite Sand-Based TiO2/Fe2O3/Fe-N-Doped Graphitic Carbon Composite for Photocatalytic Degradation of Methylene Blue under Sunlight

Fabrication of Naturally Derived Chitosan and Ilmenite Sand-Based TiO2/Fe2O3/Fe-N-Doped Graphitic Carbon Composite for Photocatalytic Degradation of Methylene Blue under Sunlight

Introducing the antibacterial and photocatalytic degradation potentials of biosynthesized chitosan, chitosan-ZnO, and chitosan-ZnO/PVP nanoparticles

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