Microwave-assisted synthesis and characterization of activated carbon–zirconium-incorporated CeO2 nanocomposites for photocatalytic and antimicrobial activity

Sivakumari, G.; Rajarajan, M.; Senthilvelan, S.

doi:10.1007/s11164-023-04968-x

Cited by 11 publications

(3 citation statements)

References 75 publications

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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%

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%

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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“…Figure 7a demonstrated the split-peak fitting of the XPS spectra of C 1s, resulting in three peaks situated at 284.8 eV, 286.5 eV, and 288.7 eV, corresponding to C-C bonded, C-O bonded, and C=O bonded, respectively [34]. The figure illustrated that the positions of the three C peaks remained unaltered before and after the adsorption of Hg 0 , regardless of the atmospheric conditions.…”

Section: Mechanism Analysismentioning

confidence: 93%

Application Study on the Activated Coke for Mercury Adsorption in the Nonferrous Smelting Industry

Zheng,

Li,

Jiang

et al. 2024

Sustainability

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The massive release of mercury undermines environmental sustainability, and with the official entry into force of the Minamata Convention, it is urgent to strengthen the control of mercury pollution. The effectiveness of activated coke (AC) in removing elemental mercury (Hg0) from high temperatures and sulfur nonferrous smelting flue gas before acid production was studied. Experimental results indicated that the optimal temperature for Hg0 adsorption by AC was 150 °C. And the adsorption of Hg0 by AC was predominantly attributed to physical adsorption. Flue gas components (SO2 and O2) impact studies indicated that O2 did not significantly affect Hg0 adsorption compared to pure N2. Conversely, SO2 suppressed the adsorption capacity, while the simultaneous presence of SO2 and O2 exhibited a synergistic effect in facilitating the removal of Hg0. The characterization results of X-ray photoelectron spectroscopy (XPS) indicated that the SO2 molecule favored to anchor at the Oα site, leading to the formation of SO3. This subsequently oxidized the mercury to HgSO4 instead of HgO. The study demonstrates that cheap and easily accessible AC applications in the adsorption of mercury technology may help improve the sustainability of the circular economy and positively impact various environmental aspects.

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“…Therefore, it is of positive signi cance to develop eco-friendly photocatalysts with high e ciency, low cost and high stability. Photocatalytic technology stands out as an ideal solution for treating water pollution, capable of degrading pollutants effectively while mitigating pollution sources [10][11][12][13]. Over the past few decades, eco-friendly semiconductor photocatalysis has attracted great attention for its ability to convert solar energy into chemical energy [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Synergistic enhancement of photocatalytic properties in ternary Cu2O/TiO2@Ti3C2Tx MXene composites

Fang,

Xu,

Tan

et al. 2024

Preprint

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Water pollution has always been an inescapable challenge in the development of human society. Photocatalytic technology is regarded to be a promising strategy for water pollution control. In this work, a novel Cu2O/TiO2@Ti3C2Tx MXene photocatalyst is constructed to obtain diverse electron transport pathways, thereby promoting charge separation and achieving superior photocatalytic performance. The synergistic effects of composite photocatalytic materials are instrumental in degrading organic dyes under visible light. The successful construction of a heterojunction structure between Cu2O and in situ generated TiO2 mitigates charge recombination post-separation, significantly extending the lifetime of photogenerated carriers. Additionally, the incorporation of Ti3C2Tx serves as an effective conductive medium, facilitating the separation and transfer of photogenerated charges within the material. Therefore, the Cu2O/TiO2@Ti3C2Tx MXene composites exhibit exceptional photocatalytic activity, showcasing the best performance, achieving a degradation rate of 71.5% after 3 h of visible light irradiation. These findings underscore the potential of this new compound in enhancing photocatalytic organic degradation, highlighting the promising application prospects of photocatalytic materials.

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Microwave-assisted synthesis and characterization of activated carbon–zirconium-incorporated CeO2 nanocomposites for photocatalytic and antimicrobial activity

Cited by 11 publications

References 75 publications

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

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

Application Study on the Activated Coke for Mercury Adsorption in the Nonferrous Smelting Industry

Synergistic enhancement of photocatalytic properties in ternary Cu2O/TiO2@Ti3C2Tx MXene composites

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