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Article Dans Une Revue Journal of Materials Science Année : 2017

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

Résumé

A simple facile method, i.e., thermal decarbonation of ZnCO3hydroxides, wasused to prepare a series of pure ZnO photocatalysts with controlled crystallitesizes, particle sizes, and morphologies. The ZnCO3precursor was synthesizedby direct wet carbonation in the presence of growth-control additives, i.e.,organic solvents, surfactants, and low molecular weight polymers. The thermaldecarbonation allows for producing ZnO photocatalysts with sizes and shapesvarying from 80±20 nm nonporous rhombohedral nanoparticles to 5±0.5lmporous particles, for a constant crystallite size of 64±3 nm. The porous ZnOparticles (5±0.5lm) exhibit two times larger photocatalytic activity formethanol oxidation than the nonporous ZnO nanoparticles (*180±30 nm).The reasons for the higher photocatalytic activity are further investigated in thiswork. A possible mechanism for the formation of ZnCO3hydroxides and theirtransformation into porous microsized ZnO particles and nonporous nanopar-ticles are carefully discussed.
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Dates et versions

hal-01674732 , version 1 (10-06-2021)

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Ahmed Barhoum, Johannes Melcher, Guy van Assche, Hubert Rahier, Mikhael Bechelany, et al.. Synthesis, growth mechanism, and photocatalytic activity of Zinc oxide nanostructures: porous microparticles versus nonporous nanoparticles. Journal of Materials Science, 2017, 52 (5), pp.2746 - 2762. ⟨10.1007/s10853-016-0567-3⟩. ⟨hal-01674732⟩
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