Photoactivity of N-doped ZnO nanoparticles in oxidative and reductive reactions

Oliveira, Jéssica A.; Nogueira, André E.; Gonçalves, Maria Carolina Pereira; Paris, E. C.; Ribeiro, Cauê; Poirier, Gaël; Giraldi, Tania R.

doi:10.1016/j.apsusc.2017.10.110

Cited by 55 publications

(21 citation statements)

References 32 publications

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“…As shown in Figure , SiO 2 PP has a high degree of agglomeration, whereas SiO 2 SG has monodisperse particles. In fact, the literature reports particles obtained by the method of the polymer precursors are presented in agglomerated form . Besides, it was verified that SiO 2 PP was more effective in the adsorption than SiO 2 SG, roughly more than twice for most of the concentrations studied.…”

Section: Resultsmentioning

confidence: 82%

Evaluation of the Mn(II) adsorption potential of SiO₂ obtained by different wet chemical methods

Gonçalves

Barbosa

Oliveira

et al. 2019

Int J Applied Ceramic Tech

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This paper describes the development of SiO 2 by 2 different wet chemical methods: polymeric precursor (PP) and sol-gel (SG). These samples were used as adsorbents of Mn(II) metal ions. Physicochemical characteristics of the 2 adsorbents were established, while zeta potential, Scanning Electron Microscopy, and Brunauer-Emmett-Teller (BET) surface area methods were further employed for characterization.Efficiencies of the prepared adsorbents in the adsorption of Mn(II) from aqueous solutions were investigated. The BET surface areas of the prepared adsorbent were 171 and 7 m 2 g −1 for SiO 2 PP and SiO 2 SG, respectively. Optimal adsorption occurred at pH 8.5, 5g L −1 of adsorbent concentration, and 90 minutes of contact time for both adsorbents. The Langmuir and Freundlich isotherms models fitted the experimental data of SiO 2 PP and SiO 2 SG, respectively, and SiO 2 PP showed the highest adsorption capacity due, probably, to its greater specific area. K E Y W O R D Sadsorption, manganese (II), polymeric precursors, silicon oxide, sol-gel

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Section: Resultsmentioning

confidence: 82%

Evaluation of the Mn(II) adsorption potential of SiO₂ obtained by different wet chemical methods

Gonçalves

Barbosa

Oliveira

et al. 2019

Int J Applied Ceramic Tech

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“…C correlates the degradation time and the dye concentration assuming a pseudo-first order kinetics [41], where v is the reaction rate, [RhB] is the dye concentration, [AS] is the concentration of active sites, assumed as the total amount of independent points on the catalyst surface where the reaction takes place, and k is the velocity constant. This model has been applied satisfactorily in studies that address the degradation of Rhodamine B by photocatalysis [42,43]…”

Section: Methodsmentioning

confidence: 98%

Photodegradation of Rhodamine B catalyzed by ZnO pellets

et al. 2019

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This paper describes the development of ZnO semiconductors applied as photocatalysts for the degradation of water contaminants, with the shape of ceramic pellets thick enough to maintain their structures, prepared by slip casting and sintering. The samples presented porosities around 40% and densities around 3.4 g/cm 3 , which represented about 61% of the theoretical density of ZnO. After obtaining the ceramic samples, the degradation of Rhodamine B dye by photocatalysis was evaluated in six cycles of degradation. After the cycles, changes in the surface of the samples were verified, possibly due to leaching during photocatalysis since they presented mean grain sizes of 0.61 μm before and 0.36 μm after the photocatalysis. The ceramic ZnO samples were able to satisfactorily degrade Rhodamine B for several cycles, resulting in successful reuse of photocatalysts and increased facility of removing the photocatalysts from the medium after degradation compared to powders in suspensions.

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“…As illustrated in Figure 8, preparation of ZnO NPs coated cellulose via dispersion of ZnO NPs in aqueous NH 4 OH (pH=8) and remove of NH + 4 in next step was carried out with having antibacterial activity against E. coli 11634 (121). Photoactivity and oxidizing antibacterial mechanisms of ZnO NPs were reported by several studies (9,122,123). Figure 9.…”

Section: Zinc Oxide Npsmentioning

confidence: 99%

Modifications of microcrystalline cellulose (MCC), nanofibrillated cellulose (NFC), and nanocrystalline cellulose (NCC) for antimicrobial and wound healing applications

Alavi

2019

E-Polymers

101

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Recently, great attention has been paid to nano-composites of cellulose, due to their unique structure as a most abundant natural polymer with having exceptional properties such as renewable, biodegradable and high specific tensile strength, aspect ratio, and Young’s modulus. Prominent cellulose is naturally present in plant lignocellulosic biomass as a biocomposite made of cellulose, hemi-celluloses, lignin, etc. In addition, it can be extracted from other natural sources including bacteria, algae, and sea animals. Microcrystalline cellulose (MCC), nanocrystalline cellulose (NCC), and nanofibrillated cellulose (NFC) is an emerging renewable nanomaterial that has various applications, such as food, paper production, industrial and pharmaceutical biomaterials. The surface modification on NCC can improves its disperse ability in different solvents and its utilization in protein immobilization, tissue engineering, drug delivery, and inorganic reaction template. Therefore, based on recent studies, this review illustrated considerable progresses with addressing medicinal properties involving antimicrobial and biocompatibility of nano-cellulose (NC) in the case of wound healing.

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Photoactivity of N-doped ZnO nanoparticles in oxidative and reductive reactions

Cited by 55 publications

References 32 publications

Evaluation of the Mn(II) adsorption potential of SiO₂ obtained by different wet chemical methods

Evaluation of the Mn(II) adsorption potential of SiO₂ obtained by different wet chemical methods

Photodegradation of Rhodamine B catalyzed by ZnO pellets

Modifications of microcrystalline cellulose (MCC), nanofibrillated cellulose (NFC), and nanocrystalline cellulose (NCC) for antimicrobial and wound healing applications

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Photoactivity of N-doped ZnO nanoparticles in oxidative and reductive reactions

Cited by 55 publications

References 32 publications

Evaluation of the Mn(II) adsorption potential of SiO2 obtained by different wet chemical methods

Evaluation of the Mn(II) adsorption potential of SiO2 obtained by different wet chemical methods

Photodegradation of Rhodamine B catalyzed by ZnO pellets

Modifications of microcrystalline cellulose (MCC), nanofibrillated cellulose (NFC), and nanocrystalline cellulose (NCC) for antimicrobial and wound healing applications

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Evaluation of the Mn(II) adsorption potential of SiO₂ obtained by different wet chemical methods

Evaluation of the Mn(II) adsorption potential of SiO₂ obtained by different wet chemical methods