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Synthesis, growth mechanism, and photocatalytic activity of Zinc oxide nanostructures: porous microparticles versus nonporous nanoparticles

Barhoum A., Melcher J., Van Assche G., Rahier H., Bechelany M., Fleisch M. and Bahnemann DSynthesis, growth mechanism, and photocatalytic activity of Zinc oxide nanostructures: porous microparticles versus nonporous nanoparticles,JOURNAL OF MATERIALS SCIENC,52(5): 2746-2762,2017 (MAR).

doi: 10.1007/s10853-016-0567-3

A simple facile method, i.e., thermal decarbonation of ZnCO3 hydroxides, was used to prepare a series of pure ZnO photocatalysts with controlled crystallite sizes, particle sizes, and morphologies. The ZnCO3 precursor was synthesized by direct wet carbonation in the presence of growth-control additives, i.e., organic solvents, surfactants, and low molecular weight polymers. The thermal decarbonation allows for producing ZnO photocatalysts with sizes and shapes varying from 80 +/- 20 nm nonporous rhombohedral nanoparticles to 5 +/- 0.5 A mu m porous particles, for a constant crystallite size of 64 +/- 3 nm. The porous ZnO particles (5 +/- 0.5 A mu m) exhibit two times larger photocatalytic activity for methanol oxidation than the nonporous ZnO nanoparticles (similar to 180 +/- 30 nm). The reasons for the higher photocatalytic activity are further investigated in this work. A possible mechanism for the formation of ZnCO3 hydroxides and their transformation into porous microsized ZnO particles and nonporous nanoparticles are carefully discussed.

BibTeX

@article{,
    author  = "Barhoum, A.; Melcher, J.; Van Assche, G.; Rahier, H.; Bechelany, M.; Fleisch, M.; Bahnemann, D",
    title   = "Synthesis, growth mechanism, and photocatalytic activity of Zinc oxide nanostructures: porous microparticles versus nonporous nanoparticles",
    journal = "JOURNAL OF MATERIALS SCIENC",
    year    = "2017",
    volume  = "52",
    number  = "5",
    pages   = "2746-2762",
    month   = "MAR",
    doi     = "10.1007/s10853-016-0567-3",
    note    = "",
}