Synthesis, characterization, and catalytic application of Au/ZnO nanocomposites prepared by coprecipitation

Donkova, B.; Vasileva, Penka; Nihtianova, D.; Velichkova, N.; Stefanov, P.; Mehandjiev, D.

doi:10.1007/s10853-011-5503-y

Cited by 39 publications

(17 citation statements)

References 37 publications

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“…The binding energy positions are much lower than that of bulk metallic Au (84.0 and 87.6 eV for Au 4f 7/2 and Au 4f 5/2 , respectively), indicating strong metal‐support interactions between the AuNPs and the ZNA 41. Similar binding energy was reported for AuNPs decorated on ZnO or TiO 2 nanoparticles 40, 42. One reason for such pronounced negative shift is the larger electronegativity of Au relative to Zn.…”

Section: Resultssupporting

confidence: 83%

“…Furthermore, the Au 4f and Zn 3p regions of the XPS spectrum of the ZNA‐AuNPs heterostructure are presented in Figure 5c, indicating that the AuNPs were bound to the ZNA with molecular linkers. It can be seen that the Au 4f peaks partially overlap with that of Zn 3p 40. The Au 4f 7/2 peak is clearly observed at binding energy of 82.9 eV, while part of Au 4f 5/2 peak (at 86.4 eV) is overlapped by the signal of Zn 3p.…”

Section: Resultsmentioning

confidence: 91%

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High Density Unaggregated Au Nanoparticles on ZnO Nanorod Arrays Function as Efficient and Recyclable Photocatalysts for Environmental Purification

Yang

Huang

Harn

et al. 2013

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114

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Photodegradation of organic pollutants in aqueous solution is a promising method for environmental purification. Photocatalysts capable of promoting this reaction are often composed of noble metal nanoparticles deposited on a semiconductor. Unfortunately, the separation of these semiconductor-metal nanopowders from the treated water is very difficult and energy consumptive, so their usefulness in practical applications is limited. Here, a precisely controlled synthesis of a large-scale and highly efficient photocatalyst composed of monolayered Au nanoparticles (AuNPs) chemically bound to vertically aligned ZnO nanorod arrays (ZNA) through a bifunctional surface molecular linker is demonstrated. Thioctic acid with sufficient steric stabilization is used as a molecular linker. High density unaggregated AuNPs bonding on entire surfaces of ZNA are successfully prepared on a conductive film/substrate, allowing easy recovery and reuse of the photocatalysts. Surprisingly, the ZNA-AuNPs heterostructures exhibit a photodegradation rate 8.1 times higher than that recorded for the bare ZNA under UV irradiation. High density AuNPs, dispersed perfectly on the ZNA surfaces, significantly improve the separation of the photogenerated electron-hole pairs, enlarge the reaction space, and consequently enhance the photocatalytic property for degradation of chemical pollutants. Photoelectron, photoluminescence and photoconductive measurements confirm the discussion on the charge carrier separation and photocatalytic experimental data. The demonstrated higher photodegradation rates demonstrated indicate that the ZNA-AuNPs heterostructures are candidates for the next-generation photocatalysts, replacing the conventional slurry photocatalysts.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 91%

High Density Unaggregated Au Nanoparticles on ZnO Nanorod Arrays Function as Efficient and Recyclable Photocatalysts for Environmental Purification

Yang

Huang

Harn

et al. 2013

Small

114

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“…The presence of AuNPs on amine functionalized ZnO NR surface was confirmed by the Au 4d 5/2 and Au 4d 3/2 peaks at 335 eV and 352 eV, respectively. The Au 4f 7/2 and Au 4f 5/2 peaks at 84 eV and 88 eV were not fully resolved due to the overlap with Zn 3d peaks(Figure 4(e), 5(e) & 6(e))[37,38].Comparison of Au 3d peaks showed that the amount of AuNP incorporated was higher in the case of APhS functionalized NR due to the tripod bonding and is consistent with the FESEM observations.…”

supporting

confidence: 76%

Gold nanoparticle immobilization on ZnO nanorods via bi-functional monolayers: A facile method to tune interface properties

et al. 2015

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“…Considering the high cost and limited supply of noble metals, recycle of these catalysts should be concerned. However, it is very difficult to desorb Au NPs from inorganic supports such as zeolites, 3 activated carbon, 4,5 and metal oxides 6,7 after catalysts getting deactivated due to their strong interaction. Aqua regia 8 is usually used to destroy the strong interaction for catalysts recycling.…”

Section: Introductionmentioning

confidence: 99%

Selective reduction of aromatic nitro compounds over recyclable hollow fiber membrane‐supported Au nanoparticles

Jin

et al. 2014

J of Applied Polymer Sci

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Guanidylated poly(2,6-dimethyl-1,4-phenylene oxide) (GPPO) hollow fiber membrane (HFM) supported Au nanoparticles are prepared by a simple adsorption-reduction of Au 31 with sodium borohydride as a reducing agent and polyvinyl pyrrolidone as a dispersant. The novel heterogeneous catalyst shows high catalytic activity for the reduction of various aromatic nitro compounds in an aqueous medium at room temperature and can be easily reused for several runs, for example, for the reduction of nitrobenzene, the yield reaches up to 92% even after 10 cycles, indicating the potential application of GPPO HFM as a catalysts support material for sustainable chemistry.

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Synthesis, characterization, and catalytic application of Au/ZnO nanocomposites prepared by coprecipitation

Cited by 39 publications

References 37 publications

High Density Unaggregated Au Nanoparticles on ZnO Nanorod Arrays Function as Efficient and Recyclable Photocatalysts for Environmental Purification

High Density Unaggregated Au Nanoparticles on ZnO Nanorod Arrays Function as Efficient and Recyclable Photocatalysts for Environmental Purification

Gold nanoparticle immobilization on ZnO nanorods via bi-functional monolayers: A facile method to tune interface properties

Selective reduction of aromatic nitro compounds over recyclable hollow fiber membrane‐supported Au nanoparticles

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