Resumo (PT):
Abstract (EN):
A simple urea-assisted hydrothermal synthesis method was used to tailor the physicochemical properties of
ZnO materials. The role of Pluronic P123 block copolymer in the crystal growth, morphology and specific
surface area of the as-prepared ZnO was studied. When Pluronic P123 is used, well-dispersed hierarchical
microspheres, with a flower-like morphology, are obtained, but in its absence large spherical agglomerated
clusters are formed. The polarity of the ZnO, measured as the ratio between plane (002) and plane (100), is
also significantly higher for the Pluronic P123 sample. The influence of zinc salt precursors was also
analysed. The use of zinc nitrate led to the formation of urchin-like ZnO structures, instead of the
microflowers that result from zinc acetate salt. Despite having similar surface areas, the polarity of the
zinc nitrate sample was much smaller. The decomposition of methylene blue corroborated the higher
photocatalytic activity of the ZnO materials with a higher proportion of polar planes (higher polarity). The
formation mechanism of the crystals is also suggested based on the observed gradual growth and
assembly of the hydrozincite during the initial steps of the synthesis for the samples with and without
Pluronic P123.
Idioma:
Inglês
Tipo (Avaliação Docente):
Científica
Notas:
Publicação abrangida pelo Journal Citation Reports 2015
Nº de páginas:
11