Vanadia as an electron-hole recombination inhibitor on fibrous silica-titania for selective hole oxidation of ciprofloxacin and Congo red photodegradation

Hassan, N.S.; Jalil, A.A.; Fei, I.C.M.; Razak, M.T.A.; Khusnun, N.F.; Bahari, M.B.; Riwayati, Y.I.; Suprapto, S.; Prasetyoko, D.; Firmansyah, M.L.; Salleh, N.F.M.; Rajendran, Saravanan

doi:10.1016/j.chemosphere.2023.139502

Cited by 11 publications

(3 citation statements)

References 53 publications

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“…During exposure to radiation, ferrites hardly get excited enough to create enough photogenerated charges. Because the band gap becomes narrower, the generated (e/h + ) pairs have tendency to recombine, resulting in reduced photocatalytic activity of pure ferrites. As previously discussed, Sm-doped spinel nanoferrites have a greater band gap value and surface area, which significantly improves their photocatalytic active sites for pollutant degradation .…”

Section: Resultsmentioning

confidence: 99%

Sm Doped Cu–Ni Spinel Ferrite Nanoparticles for Hyperthermia and Photocatalytic Applications

Ghosh,

Mondal,

Sonkar

et al. 2024

ACS Appl. Nano Mater.

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This work explored the versatility of nanocrystalline Smdoped Cu−Ni spinel ferrites in different applications, with a special emphasis on hyperthermia and photocatalytic activities. By incorporating Sm dopants at varied percentages in nanosized Cu−Ni spinel ferrites, the magnetic, electrical, and structural properties of the host ferrites were tailored to make them versatile materials with applications in various technological fields. Careful examination of the powder X-ray diffractograms (XRDs) ensured the presence of pure spinel cubic crystal structure for all of the synthesized ferrite samples. Obtained high-resolution transmission electron microscopy images also validated the XRD results along with mean size, morphology, and regularity in both shape and size were examined thoroughly. With increasing the Sm percentage, the average size of ferrite nanoparticles reduced, which is also verified by the gradual increase in bandgap as obtained from Tauc plots. Additionally, it is found that the hopping of electrons under an applied alternating electric field was the main process of charge conduction for all the ferrite samples, and effects of grain boundaries dominated over grains in determining the dielectric responses. The incorporation of Sm 3+ ions owning less magnetic moment compared to Fe 3+ ions reduced both the coercive field and saturation magnetization gradually as noticed in M(H) loops. The aroused superparamagnetic phenomenon at room temperature due to Sm doping favored the magnetic controlled hyperthermia through induction heating. Bare Sm doped Cu−Ni ferrite samples showed excellent induction heating, obeying clinical safety limits. In addition, photon-mediated degradation of the ciprofloxacin (CIP) antibiotic was conducted using the as-prepared samples and it was found that 15% Sm doped Cu−Ni ferrite sample was sufficient to remove 95.8% of the CIP from the solution in 60 min. Moreover, doped ferrite samples also displayed excellent antioxidant and antidiabetic properties. Hence, Sm-doped Cu−Ni spinel nanoferrites are versatile materials with applications, especially in hyperthermia and photocatalysis.

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Section: Resultsmentioning

confidence: 99%

Sm Doped Cu–Ni Spinel Ferrite Nanoparticles for Hyperthermia and Photocatalytic Applications

Ghosh,

Mondal,

Sonkar

et al. 2024

ACS Appl. Nano Mater.

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“…These powerful oxidizing agents attack adsorbed organic molecules non-selectively causing their mineralization [25]. Degradation of most organic compounds by photocatalysis may be described using a pseudo-first-order kinetic model for reactions that occur at the solid-liquid interface [26]. The ln (C/C 0 ) graph against time producing a linear line verifies that the reaction towards DNP and CIP follows the pseudo-first-order kinetic model.…”

Section: Photocatalytic Properties Of Zno Powdermentioning

confidence: 94%

Oxidation of Zinc Microparticles by Microwave Plasma to Form Effective Solar-Sensitive Photocatalysts

Muslimov,

Antipov,

Gadzhiev

et al. 2023

Applied Sciences

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The presented work studies the processes of synthesis of ZnO microstructures using atmospheric-pressure microwave nitrogen plasma and investigates their photocatalytic activity in the processes of degradation of 2,4-dinitrophenol and the antibiotic ciprofloxacin when irradiated with sunlight. The work proposes an effective method for formation of photosensitive ZnO powders. Due to the features of plasma treatment in the open atmosphere of zinc metal microparticles, ZnO structures are formed with sizes from hundreds of nanometers to several micrometers with various micromorphologies. The lattice parameters of ZnO structures are characteristic of a hexagonal unit with a = 3.258 Å and c = 5.21 Å, volume 47.95 Å3. The size of the crystallites is 48 nm. The plasma treatment was performed by means of a 2.45-GHz plasmatron at a power input of 1 kW in nitrogen flow at a rate of 1–10 L/min. Zn microparticles were injected into the microwave plasma at a mass rate of 20 g/min. High photoactivity was demonstrated (rate constants 0.036 min−1 and 0.051 min−1) of synthesized ZnO structures during photo-degradation of 2,4-dinitrophenol and ciprofloxacin, respectively, when exposed to solar radiation. Photo-active structures of ZnO synthesized using microwave plasma can find application in processes of mineralization of toxic organic compounds. Structures of ZnO synthesized using microwave plasma can find application in processes of mineralization of toxic organic compounds, and also in scintillation detectors, phosphors.

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“…The observed decrease in the maximum absorbance peaks is due to the photocatalytic removal of the organic pollutants. Degradation of most organic compounds by photocatalysis may be described using a pseudo-first-order kinetic model for reactions that occur at the solid-liquid interface [23]. The ln (C/C0) graph against time producing a linear line verifies that the reaction towards DNP and CIP follows the pseudo-first-order kinetic model.…”

Section: Photocatalytic Properties Of Zno Powdermentioning

confidence: 99%

Synthesis of Solar-Sensitive ZnO Photocatalysts Using Microwave Plasma for Effective Degradation of Phenols and Antibiotics

Muslimov,

Antipov,

Gadzhiev

et al. 2023

Preprint

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The presented work studies the processes of synthesis of nitrogen-containing structures of ZnO using atmospheric pressure microwave nitrogen plasma and investigates their photocatalytic activity in the processes of degradation of 2,4-dinitrophenol and the antibiotic ciprofloxacin when irradiated with sunlight. The work proposes an effective method for formation of photosensitive ZnO powders. Due to the features of plasma treatment in the open atmosphere of zinc metal microparticles, ZnO structures are formed with sizes from hundreds of nanometers to several micrometers with various micromorphologies. High photoactivity was demonstrated (rate constants 0.036 min-1 and 0.051 min-1) of synthesized ZnO structures during photo-degradation of 2,4-dinitrophenol and ciprofloxacin, respectively, when exposed to solar radiation. Photo-active structures of ZnO synthesized using microwave nitrogen plasma can find application in processes of mineralization of toxic organic compounds.

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Vanadia as an electron-hole recombination inhibitor on fibrous silica-titania for selective hole oxidation of ciprofloxacin and Congo red photodegradation

Cited by 11 publications

References 53 publications

Sm Doped Cu–Ni Spinel Ferrite Nanoparticles for Hyperthermia and Photocatalytic Applications

Sm Doped Cu–Ni Spinel Ferrite Nanoparticles for Hyperthermia and Photocatalytic Applications

Oxidation of Zinc Microparticles by Microwave Plasma to Form Effective Solar-Sensitive Photocatalysts

Synthesis of Solar-Sensitive ZnO Photocatalysts Using Microwave Plasma for Effective Degradation of Phenols and Antibiotics

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