Template-Free Synthesis of Uniform CdS Hollow Nanospheres and Their Photocatalytic Activities

Lin, Gui; Zheng, Jianwei; Xu, Rong

doi:10.1021/jp8006969

Cited by 181 publications

(102 citation statements)

References 85 publications

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“…Thus, we propose that thiourea plays two important roles in the formation of ZnS nanospheres: It acts as a complexing reagent by forming Zn 2 + -thiourea ligands and as the source of sulfur after breaking of the C=S double bond by the strong nucleophilic substitution of the oxygen atoms of H 2 O molecules. [33] The probable reaction processes for the formation of ZnS nanospheres can be summarized by Equations (2)-(4).…”

Section: Wwwchemeurjorgmentioning

confidence: 99%

One‐Pot Template‐Free Synthesis of Monodisperse Zinc Sulfide Hollow Spheres and Their Photocatalytic Properties

Huang

2009

Chemistry A European J

232

140

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Monodisperse wurtzite ZnS hollow spheres with diameters of about 200 nm and shells composed of nanoparticles have been successfully synthesized in high yield by a one-pot template-free hydrothermal route. The reaction duration, reactant species, and reaction temperature have been shown to play important roles in the formation of ZnS hollow spheres. X-ray diffraction, scanning and transmission electron microscopy, nitrogen adsorption/desorption, UV/Vis diffuse reflectance spectroscopy, and photoluminescence were used to characterize the products. The results show that all the prepared nanospheres have hexagonal wurtzite structures and exhibit good size uniformity and regularity. A mechanism for the formation of the ZnS hollow spherical structure by localized Ostwald ripening has been proposed based on experimental observations. In addition, studies of the photocatalytic properties of the ZnS hollow spheres by exposure to UV irradiation have demonstrated that they have potential photocatalytic applications. Hydroxyl radicals (*OH) were not detected on the surface of UV-illuminated ZnS by the photoluminescence technique, which suggests that *OH is not the dominant photo-oxidant and a photogenerated hole could instead directly participate in the photocatalytic reaction. The prepared ZnS hollow spheres are also of great interest for use in flat displays, sensors, lasers, catalysis, separation technology, biomedical engineering, and nanotechnology.

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Section: Wwwchemeurjorgmentioning

confidence: 99%

One‐Pot Template‐Free Synthesis of Monodisperse Zinc Sulfide Hollow Spheres and Their Photocatalytic Properties

Huang

2009

Chemistry A European J

232

140

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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: 81%

Oxidative Degradation of Methylene Blue Using Mn3O4 Nanoparticles

Ullah

Kibria

Akter

et al. 2017

Water Conserv Sci Eng

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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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“…Lin et al developed a template-free method for the fabrication of CdS hollow nanospheres. [12] The obtained hollow nanosphere catalyst demonstrated good photocatalytic activity for methylene blue degradation. However, most of the hollow nanostructured catalysts are for metal particles or their derivatives.…”

Section: Introductionmentioning

confidence: 92%

Chirally Functionalized Hollow Nanospheres Containing L‐Prolinamide: Synthesis and Asymmetric Catalysis

Gao

Liu

Tang

et al. 2010

Chemistry A European J

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Chirally functionalized hollow nanospheres with different surface properties were successfully synthesized by co-condensation of (2S,1'R,2'R)-N-tert-butyloxycarbonylpyrrolidine-2-carboxylic acid [2'-(4-trimethoxysilylbenzylamide)cyclohexyl] amide with 1,2-bis(trimethoxysilyl)ethane or tetramethoxysilane using F127 (EO(106)PO(70)EO(106)) as surfactant in water. The TEM and N(2) sorption characterizations show that the particle size of the hollow nanosphere is 15-21 nm with a core diameter of 10-16 nm. These L-prolinamide-functionalized hollow nanospheres are highly efficient solid catalysts for the direct asymmetric aldol reaction between cyclohexanone and aromatic aldehydes. It was found that the addition of water in the reaction system not only enhanced the catalytic activity but also increased the enantioselectivity, which is probably due to the enhanced hydrogen bond between the amide oxygen atom and the hydroxyl group of water. Moreover, the catalytic activity increases sharply as the surface hydrophobicity of the hollow nanospheres increases. These hollow nanospheres are quite stable and can be reused with almost the same enantioselectivity and only a slight decrease in catalytic activity.

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Template-Free Synthesis of Uniform CdS Hollow Nanospheres and Their Photocatalytic Activities

Cited by 181 publications

References 85 publications

One‐Pot Template‐Free Synthesis of Monodisperse Zinc Sulfide Hollow Spheres and Their Photocatalytic Properties

One‐Pot Template‐Free Synthesis of Monodisperse Zinc Sulfide Hollow Spheres and Their Photocatalytic Properties

Oxidative Degradation of Methylene Blue Using Mn3O4 Nanoparticles

Chirally Functionalized Hollow Nanospheres Containing L‐Prolinamide: Synthesis and Asymmetric Catalysis

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