Catalytic activity of mesoporous cobalt oxides with controlled porosity and crystallite sizes: Evaluation using the reduction of 4-nitrophenol

Mogudi, Batsile M.; Ncube, Phendukani; Meijboom, Reinout

doi:10.1016/j.apcatb.2016.05.051

Cited by 113 publications

(40 citation statements)

References 47 publications

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“…Moreover, for the fifth and tenth cycles, the calculated κ nor (0.64 and 0.54 min −1 g −1 L) are even higher than these catalysts [51–58]. All these results illustrate that the prepared SnO 2 /Ag microsphere can be taken as a potential efficient catalyst for the reduction of 4-NP.…”

Section: Resultsmentioning

confidence: 77%

One-Pot Green Synthesis of Ag-Decorated SnO2 Microsphere: an Efficient and Reusable Catalyst for Reduction of 4-Nitrophenol

Zhang

Luo

et al. 2017

Nanoscale Res Lett

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In this paper, hierarchical Ag-decorated SnO2 microspheres were synthesized by a facile one-pot hydrothermal method. The resulting composites were characterized by XRD, SEM, TEM, XPS, BET, and FTIR analysis. The catalytic performances of the samples were evaluated with the reduction of 4-nitrophenol to 4-aminophenol by potassium borohydride (KBH4) as a model reaction. Time-dependent experiments indicated that the hierarchical microspheres assembled from SnO2 and Ag nanoparticles can be formed when the react time is less than 10 h. With the increase of hydrothermal time, SnO2 nanoparticles will self-assemble into SnO2 nanosheets and Ag nanoparticles decorated SnO2 nanosheets were obtained. When evaluated as catalyst, the obtained Ag-decorated SnO2 microsphere prepared for 36 h exhibited excellent catalytic performance with normalized rate constant (κ nor) of 6.20 min−1g−1L, which is much better than that of some previous reported catalysts. Moreover, this Ag-decorated SnO2 microsphere demonstrates good reusability after the first five cycles. In addition, we speculate the formation mechanism of the hierarchical Ag-decorated SnO2 microsphere and discussed the possible origin of the excellent catalytic activity.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-017-2204-8) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 77%

One-Pot Green Synthesis of Ag-Decorated SnO2 Microsphere: an Efficient and Reusable Catalyst for Reduction of 4-Nitrophenol

Zhang

Luo

et al. 2017

Nanoscale Res Lett

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“…Furthering the supposition that samples D 1 and D 2 produce oxalates, the acido-basic properties of these compounds were focussed on. These can be determined by the ratio of HCl mols consumed while disolving and protonation of the precursors and the NaOH mols consumed for the Co(OH) 2 Figure 4 presents the conductometric curves for D1-D4. On the titration curves in Figure 4, two sets of data can be observed, the first corresponding to the ‚standard' titration, HCl with NaOH, formed by 2 lines with a single equivalence volume at ~ 10 cm 3 .…”

Section: Resultsmentioning

confidence: 99%

“…The reagents used in synthesis were: Co(NO 3 ) 2 The synthesis method consists in dissolving cobalt nitrate in the corresponding EG amount followed by controlled heating at temperatures higher than 100°C. At these temperatures, the redox reaction starts accompanied by nitrogen oxid emission (brown-reddish gas).…”

Section: Methodsmentioning

confidence: 99%

“…Due to their exceptional attributes and reduced dimensions, they can be exploited in a large range of fields [1]. Cobalt oxides are important materials with a wide array of applications, such as, catalysts [2,3,4,5,6], different kind of sensors [7,2,4,5], lithium ion batteries [8,7,5], optoelectronic devices [9,10], combustion of hydrocarbons at gas purification [11], supercapacitors [12,13], Fisher-Tropsh syntheses [14] and biomedical sciences [1,7,12]. Cobalt oxides obtained as nanoparticles present a particular interest due to their different properties compared to the bulk material.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the cobalt nitrate:ethylene glycol molar ratio on the formation of carboxylate precursors and cobalt oxides

Dippong¹,

Goga²,

Avram³

2017

Studia UBB Chemia

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This paper focuses on the obtaining of carboxylate precursors through the redox reaction of cobalt nitrate and ethylene glycol, in different stoechiometric ratios, as well as the decomposition of precursors into cobalt oxides. The influence of the NO3 − :C2H6O2 stoichiometric ratio on the formation of the precursors is studied through thermal analysis, FTIR spectroscopy and acido-basic analysis (conductometric/potentiometric titrimetry). Phase analysis by XRD and FTIR of the powders obtained at the decomposition of the precursors at 400°C has evidenced the formation of CoO for a high NO3 -:C2H6O2 synthesis ratio and of Co3O4 for a low NO3 − :C2H6O2 ratio. The Scherrer equation and scanning electron microscopy (SEM) were used to determine the dimensions of the nanoparticles obtained.

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“…The peak that appeared at 300 nm is assigned to the formation of 4-aminophenols. 36 The apparent rate (k aap ) constant and correlation constants (R 2 ) for Cu, Pd and Pd@Cu nanoparticles were calculated by plotting ln(C t /C o ) versus reaction time for the reduction of 4-NP ( Figure 6). The slopes of graph indicate pseudo first-order kinetics.…”

Section: Catalytic Activities Of Cu Pd and Their Bimetallic Pd@cu Namentioning

confidence: 99%

Synthesis, structural characterization and catalytic application of citrate-stabilized monometallic and bimetallic palladium@copper nanoparticles in microbial anti-activities

Ullah

Khan²,

Sohail³

et al. 2017

IJN

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In this research work, copper (Cu), palladium (Pd) and their bimetallic palladium@ copper (Pd@Cu) nanoparticles were synthesized using trisodium citrate as a stabilizing agent using the known chemical reduction method. The synthesized Cu, Pd and Pd@Cu nanoparticles were characterized by the ultraviolet–visible spectroscopy, scanning electron microscopy and X-ray diffraction spectroscopy, respectively. The different volumes of trisodium citrate were used for the stability of synthesized monometallic Cu, Pd and bimetallic Pd@Cu nanoparticles. The synthesized Cu, Pd and their bimetallic Pd@Cu nanoparticles were used as catalysts for the reduction of 4-nitrophenol in the presence of NaBH 4 . The bimetallic Pd@Cu nanoparticles had efficient catalytic activities with a high rate constant (1.812 min −1 ) as compared to monometallic Cu (0.3322 min −1 ) and Pd (0.2689 min −1 ) nanoparticles, respectively. The correlation coefficient ( R 2 ) was found to be 0.99 for these three nanoparticles. Meanwhile, the effect of Cu, Pd and bimetallic Pd@Cu nanoparticles was checked on the physiology of specific different micro-organism strains. The bimetallic Pd@Cu nanoparticles reported the maximum resistance at maximum level the growth of bacterial strain and had observed a smooth antibacterial graph than the monometallic analogs.

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Catalytic activity of mesoporous cobalt oxides with controlled porosity and crystallite sizes: Evaluation using the reduction of 4-nitrophenol

Cited by 113 publications

References 47 publications

One-Pot Green Synthesis of Ag-Decorated SnO2 Microsphere: an Efficient and Reusable Catalyst for Reduction of 4-Nitrophenol

One-Pot Green Synthesis of Ag-Decorated SnO2 Microsphere: an Efficient and Reusable Catalyst for Reduction of 4-Nitrophenol

Influence of the cobalt nitrate:ethylene glycol molar ratio on the formation of carboxylate precursors and cobalt oxides

Synthesis, structural characterization and catalytic application of citrate-stabilized monometallic and bimetallic palladium@copper nanoparticles in microbial anti-activities

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