Ultraviolet light driven photocatalytic and antimicrobial activity of activated carbon-zirconium doped α-Fe2O3 nanocomposites

Sivakumari, G.; Rajarajan, Muttukrishnan; Naveenkumar, R; Senthilvelan, S.

doi:10.1007/s42247-023-00518-8

Cited by 4 publications

(2 citation statements)

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“…Figure 8(d) shows the 2p 3/2 state, which is found at 780.03 eV in Co2p state spectra, indicating the presence of oxidized cobalt species for Co O chemical bonding. The hexagonal ZnO matrixes substitutional Co doping is confirmed by the absence of metallic Co in the Co−ZnO nanocomposite and the presence of Co 2+ [41,42] . Together with many high‐binding energy shoulders of the C1s spectrum in Figure 8(e), the broad, symmetric signal located at about 285.77 eV provides a finger‐print for the position, broadening, and shape of the predicted disordered carbon [40] …”

Section: Resultsmentioning

confidence: 73%

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Photocatalytic Degradation of Toxic Rhodamine B Dye by Green‐Synthesised Activated Carbon‐Supported Cobalt Doped ZnO With Further Assessment of ZnO Nanoparticles in Antimicrobial Applications

Naveenkumar,

Karthikeyan,

Senthilvelan

2024

ChemistrySelect

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This work investigates the synthesis of ZnO nanoparticles, cobalt (Co)‐doped ZnO, and Activated Carbon (AC) ‐Co doped ZnO via green precipitation technique. AC developed from lotus stems and precipitated by lotus leaf extract. Comprehensive structural, optical, and morphological investigations by FT‐IR, XRD, FE‐SEM, EDX, HR‐TEM, UV‐DRS, PL, and XPS studies are used to characterize the photocatalysts. The ZnO nanoparticles are shown to have a hexagonal phase by XRD examination. The results of the FT‐IR analysis proved that specific chemical bonds exist in the ZnO, Co−ZnO, and AC−Co‐doped ZnO nanocomposites. FE‐SEM images revealed spherical morphology with aggregated, randomly distributed particles with an average size range of ZnO, Co−ZnO and AC−Co−ZnO are 59.55, 42.55, 41.16 nm. The band gap energies of ZnO, Co ‐ZnO, and AC−Co‐ ZnO, are found to be 3.10, 2.57, and 1.94 eV, respectively. Rhodamine B is used as a model contaminant to assess the samples under UV‐light driven photocatalytic effectiveness. The photocatalytic degradation efficiency (%) of the pristine ZnO, Co‐doped ZnO, and AC−Co‐doped ZnO catalysts are increased to 61.76, 74.86, and 91.46 % after 140 minutes of under UV‐light irradiation. Degradation rate constant (k) of the AC−Co−ZnO photocatalyst is found to be greater than that of pristine ZnO and Co−ZnO. Due to the synergistic effect of the AC and Co metal dopants and the spherical morphology of the AC−Co−ZnO sample, which boosted UV‐visible light absorption with reduced charge carrier recombination, resulting in outstanding photocatalytic activity. The study also investigated the bioactive effect of the samples on six bacterial species, revealing that the AC−Co‐doped ZnO nanocomposite has the most enhanced inhibitory effects against gram‐positive and gram‐negative bacteria. Consequently, medical wound dressing materials which helps to promote early healing by preventing microbial contamination.

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Section: Resultsmentioning

confidence: 73%

“…[42] . [41,42] Together with many high-binding energy shoulders of the C1s spectrum in Figure 8(e), the broad, symmetric signal located at about 285.77 eV provides a finger-print for the position, broadening, and shape of the predicted disordered carbon. [40] Photocatalytic Performance…”

Section: Xps Analysismentioning

confidence: 87%