Template-free synthesis of CdS hollow nanospheres based on an ionic liquid assisted hydrothermal process and their application in photocatalysis

Mn 3 O 4 nanoparticles were synthesized from one-step reduction of KMnO 4 with glycerol at 80°C. The structural and surface morphological characterizations were carried out using FT-IR, XRD, and FESEM analyses. The elemental composition was evidenced from EDX analysis. XRD analysis showed the tetragonal crystal geometry of Mn 3 O 4 nanoparticles with an average crystallite size of ∼20 nm. The surface morphology of the Mn 3 O 4 nanoparticles was found to be spherical from the FESEM image. The Mn 3 O 4 nanoparticles were then tested as a potential oxidant for the decolorization of methylene blue (MB) and found to be capable of N-demethylation of MB forming thionine as the final product, and removing 80% of the dye in approximately 1 h. The decolorization of MB by Mn 3 O 4 occurred through a surface mechanism, i.e., formation of surface precursor complex between MB and surface-bound Mn (II, III), where, electron transfer occurs within the surface complex. The effect of suspension pH (3-4 < pH pzc ; 5-10 > pH pzc ) on MB decolorization was assessed. Suspension pH exerted double-edged effects on MB decolorization by influencing the formation of surface precursor complex, and reducing potential of the system.

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“…[34][35][36][37][38][39]. The results also showed that the degree of degradation was enhanced in lower pH medium.…”

Section: Effect Of Medium Ph On Mb Degradationmentioning

confidence: 83%

Oxidative Degradation of Methylene Blue Using Mn3O4 Nanoparticles

Ullah

Kibria

Akter

et al. 2017

Water Conserv Sci Eng

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“…Cadmium sulfide (CdS), a typical semiconductor of II-VI group with the band gap at 2.42 eV, owns outstanding photocatalytic property. Li et al [73] prepared hollow CdS nanospheres with a diameter of about 130 nm and controllable shell thickness through 1-butyl-3-methylimidazolium-bis(trifluoro-methylsulfonyl)-imide ionic liquids as the templates, polyvinylpyrrolidone adjusting the formation of spheres and hexamethylenetetramine regulating the size and shell thickness. The photodegradation rate for methylene blue by the hollow CdS spheres can achieve 81% under ultraviolet irradiation in 80 minutes.…”

Section: Single Metal Sulfidementioning

confidence: 99%

Research Advances in Photocatalysis of Inorganic Hollow Spheres

Tian¹,

Hu²,

Xiao³

2014

WJNSE

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Inorganic hollow spheres have shown their superiority in photocatalytic area due to the large specific surface area, controllable structure and their own special optical, electrical, magnetic properties. According to the classification of inorganic hollow spheres as photocatalysts, recent research progress and application status have been summarized in this paper. At last, the future developments of inorganic hollow spheres in photocatalytic field have been discussed.

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“…20 The mentioned research on VO 2 -based core-shell nanostructures represents examples of a huge endeavor to develop analogous structures of a vast range of materials, and representative recent work on hollow nanospheres-which will be shown below to have the most interesting properties for the case of VO 2 -has been presented for a multitude of other oxides including MgO, 21 SiO 2 , 22 c-MnO 2 , 23 NiO, 24 ZnO, 25 In 2 O 3 , 26,27 and SnO 2 . 28,29 Other recent investigations embrace hollow nanospheres of sulfides, [30][31][32] selenides, 33 phosphates, 34 carbides, 35 and metals in elemental 36,37 and composite 38,39 form.…”

Section: Introductionmentioning

confidence: 99%

Nanothermochromics with VO2-based core-shell structures: Calculated luminous and solar optical properties

Li¹,

Niklasson²,

Granqvist³

2011

Journal of Applied Physics

105

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Composites including VO 2 -based thermochromic nanoparticles are able to combine high luminous transmittance T lum with a significant modulation of the solar energy transmittance DT sol at a "critical" temperature in the vicinity of room temperature. Thus nanothermochromics is of much interest for energy efficient fenestration and offers advantages over thermochromic VO 2 -based thin films. This paper presents calculations based on effective medium theory applied to dilute suspensions of core-shell nanoparticles and demonstrates that, in particular, moderately thin-walled hollow spherical VO 2 nanoshells can give significantly higher values of DT sol than solid nanoparticles at the expense of a somewhat lowered T lum . This paper is a sequel to a recent publication [S.-Y. Li, G. A. Niklasson, and C. G. Granqvist, J. Appl. Phys. 108, 063525 (2010)].

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Template-free synthesis of CdS hollow nanospheres based on an ionic liquid assisted hydrothermal process and their application in photocatalysis

Cited by 43 publications

References 39 publications

Oxidative Degradation of Methylene Blue Using Mn3O4 Nanoparticles

Oxidative Degradation of Methylene Blue Using Mn3O4 Nanoparticles

Research Advances in Photocatalysis of Inorganic Hollow Spheres

Nanothermochromics with VO2-based core-shell structures: Calculated luminous and solar optical properties

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