NDLI: Facile template-free hydrothermal synthesis of Co3O4 hollow microspheres constructed by nanoparticles using [Co(NH3)4CO3]NO3 and their photocatalytic activity

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Facile template-free hydrothermal synthesis of Co3O4 hollow microspheres constructed by nanoparticles using [Co(NH3)4CO3]NO3 and their photocatalytic activity

Content Provider	Semantic Scholar
Author	Farhadi, Saeed Heydari-Chegeni, Zahra Mousavi, Marzieh
Copyright Year	2017
Abstract	Abstract Co3O4 hollow microspheres were successfully prepared by a template-free facile hydrothermal route at 180 °C for 6 h, employing the [Co(NH3)4CO3]NO3 complex as a new precursor. Techniques of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), UV–visible spectroscopy, Raman spectroscopy, field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), and magnetic measurements were used to characterize the structure and morphology of the product. The FT-IR, XRD, Raman and EDX analyses confirmed that the obtained product is highly pure spinel-type Co3O4 phase. The SEM and TEM results showed that the obtained Co3O4 are hollow microspheres with diameter size of about 0.5–3.5 μm and an average shell thickness of approximately 50–100 nm which are composed of about 20–30 nm nanoparticles. The optical absorption spectrum of the Co3O4 hollow spheres showed two direct band gaps of 2.20 and 3.60 eV with a blue shift in comparison with previous reported values. The as-prepared Co3O4 nanostructure showed a weak ferromagnetic behaviour that could be attributed to uncompensated surface spins and/or finite-size effects. The results show that temperature and precursor play key roles on the final morphologies of Co3O4 crystals. A possible formation mechanism of Co3O4 hollow microspheres was proposed. Also, the as-prepared Co3O4 hollow microspheres show high photocatalytic activity for the degradation of methylene blue (MB) by H2O2.
Starting Page	923
Ending Page	933
Page Count	11
File Format	PDF HTM / HTML
DOI	10.1016/j.jallcom.2016.09.136
Volume Number	692
Alternate Webpage(s)	http://lu.ac.ir/usersfiles/171748978388150385.3246517.2.pdf
Alternate Webpage(s)	https://doi.org/10.1016/j.jallcom.2016.09.136
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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