Photocatalytic activity of ZrO 2 doped lead dioxide nanocomposites: Investigation of structural and optical microscopy of RhB organic dye

Kaviyarasu, K.; Kotsedi, L.; Simo, A.; Fuku, Xolile; Mola, Genene Tessema; Kennedy, J.; Mâaza, M.

doi:10.1016/j.apsusc.2016.11.149

Cited by 130 publications

(20 citation statements)

References 32 publications

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“…The photocatalytic degradation of organic dyes by tetragonal and monoclinic phases of zirconia either have been attributed to reduced particle size or oxygen vacancies or both. The band gap reduction due to doping with metal oxides and the synergistic effect of carbon has also been reported to aid the catalytic activity of zirconia in UV/visible light 5 – 15 .…”

Section: Introductionmentioning

confidence: 99%

Dominating role of crystal structure over defect chemistry in black and white zirconia on visible light photocatalytic activity

Teeparthi

Awin

Kumar

2018

Sci Rep

117

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Nanometric powder particles of white zirconia were synthesized through precursor route by the pyrolysis of zirconium (IV) butoxide at varied temperatures in air ranging from 900–1400 °C and were predominantly monoclinic in nature. To control the defect chemistry, the precursor was also pyrolyzed in a reduced atmosphere at 900 °C, eventually resulting in black zirconia. The stabilization of tetragonal phase and observed color change from white to black in samples pyrolyzed under reduced atmosphere was attributed to the creation of oxygen vacancies and disorder. The black and white zirconia produced delineated the influence of crystal structure and oxygen vacancies on the photocatalytic performance. Furthermore, zirconia synthesized at lower temperatures (600 and 800 °C) in air confirmed the detrimental role of tetragonal phase on the degradation behavior of methylene blue dye. High photocatalytic degradation rate for white zirconia was attributed to the presence of increased density of nano-sized pores and low recombination rate of electron-hole pairs as confirmed by PL measurements. Interestingly, black zirconia exemplified relatively limited activity albeit presence of oxygen vacancies. This negative effect was attributed to the presence of tetragonal phase and possibly, the insufficient creation of new energy states near valence and conduction band towards Fermi energy level.

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Section: Introductionmentioning

confidence: 99%

Dominating role of crystal structure over defect chemistry in black and white zirconia on visible light photocatalytic activity

Teeparthi

Awin

Kumar

2018

Sci Rep

117

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“…The semiconductor-metal oxide nanostructures have gained considerable attention from the scientists worldwide due to their promising applications in energy supply and environmental remediation for photoreversible color-switching materials (1)(2)(3)(4)(5). Nickel oxide nanocrystallites has a rock salt structure which exhibits the characteristics of a p-type semiconductor (6).…”

Section: Introductionmentioning

confidence: 99%

Structural, optical and photocatalytic applications of biosynthesized NiO nanocrystals

Diallo

Kaviyarasu

Ndiaye

et al. 2018

Green Chemistry Letters and Reviews

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NiO is one of the most important candidates for semiconductors metal oxide nanocrystals by the arrangement of photocatalytic application. However, the photocatalytic performance of biosynthesized nanocrystals using Aspalathus linearis (Burm.f.) R. Dahlgren has not been investigated yet. In this contribution, we synthesize α-Ni(OH) 2 using an A. linearis. A heat treatment of the α-Ni(OH) 2 is carried out at 300-400°C for 2 h at normal air yields. Furthermore, we have characterized the structural, optical and photocatalytic activity of the samples. The optical results indicate that biosynthesized nanocrystals exhibit UV-visible light absorption and a narrow range distribution of intense green light (518.95 nm) emission, which decreases significantly as annealing temperature increases. The bandgap energies of the sample annealed at 300-400°C shift to lower photon energy, compared to bulk NiO (∼ 4 eV). Moreover, the photocatalytic experimental results reveal that NiO nanocrystals enable color switching of methylene blue.

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“…In order to improve the mechanical properties of scaffolds based on those polymers and ensure better adherence and proliferation of cells, composites containing calcium phosphates, bioglass or other fillers are used. Recently, the development of a new generation of nanomaterials in the field of photonics and bioelectronics also helps in development of materials with unique biomedical properties …”

Section: Introductionmentioning

confidence: 99%

The studies of cytotoxicity and antibacterial activity of composites with ZnO‐doped bioglass

Ciołek

Biernat

Jaegermann

et al. 2018

Int J Applied Ceramic Tech

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The paper presents results of the studies on porous composites obtained using lyophilization method based on the solutions of the following polymers: chitosan, sodium alginate and polylactide, as well as ZnO-doped CaO-SiO 2 -P 2 O 5 bioglass.The researchers took the advantage of zinc ions demonstrating the bactericidal, immune-stimulating, and tissue-regenerating functions in the organism. The cytotoxicity of the composites was tested on L929 cells by means of the direct and the indirect contact method. The antibacterial properties were determined against the gram-negative bacteria Pseudomonas aeruginosa and the gram-positive bacteria Staphylococcus aureus at 24, 48 hours, and 7 days. The study demonstrated that changes due to cytotoxicity effect of the composites depend on the type of polymer and on the duration of contact with cells. The composite with polylactide was found to be the least toxic for L929 cells. ZnO added to the chemical composition of bioglass ensured bactericidal effects. The antibacterial properties of the composites depended on the ZnO content, bioglass grain size, polymer type, and composite microstructure. The composites presented in this paper are innovative as biomaterials for filling bone cavities because they can be a matrix for cells and have an antibacterial effect while supporting the regeneration of damaged tissue. K E Y W O R D Santibacterial activity, bioglass, composite, cytotoxicity

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Photocatalytic activity of ZrO 2 doped lead dioxide nanocomposites: Investigation of structural and optical microscopy of RhB organic dye

Cited by 130 publications

References 32 publications

Dominating role of crystal structure over defect chemistry in black and white zirconia on visible light photocatalytic activity

Dominating role of crystal structure over defect chemistry in black and white zirconia on visible light photocatalytic activity

Structural, optical and photocatalytic applications of biosynthesized NiO nanocrystals

The studies of cytotoxicity and antibacterial activity of composites with ZnO‐doped bioglass

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