Journal
CHEMICAL INDUSTRY & CHEMICAL ENGINEERING QUARTERLY
Volume 18, Issue 2, Pages 295-303Publisher
ASSOC CHEMICAL ENG
DOI: 10.2298/CICEQ110923006H
Keywords
ZnAl layered double hydroxides; ZnAl mixed oxides; UV irradiation; photocatalytic activity; methylene blue
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Funding
- Serbian Ministry of Education and Science [III 45008]
- Provincial Secretariat for Science and Technological Development of Vojvodina region [114-451-2084//2011]
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Layered double hydroxides (LDHs) have been studied to a great extent as environmental-friendly complex materials that can be used as photocatalysts or photocatalyst supports. ZnAl layered double hydroxides and their derived mixed oxides were chosen for the investigation of photocatalytic performances in correlation with the UV intensities measured in the South Pannonia region. The low supersaturation coprecipitation method was used for the ZnAl LDH synthesis. For the characterization of LDH and thermal treated samples powder X-ray diffraction (XRD), scanning electron microscopy (SEM), electron dispersive spectroscopy (EDS) and nitrogen adsorption-desorption were used. The decomposition of azodye, methylene blue was chosen as photocatalytic test reaction. The study showed that the ZnAl mixed oxide obtained by thermal decomposition of ZnAl LDH has stable activity in the broader UV light irradiation range characterizing the selected region. Photocatalytic activity could be mainly attributed to the ZnO phase, detected both in LDH and thermally treated samples. The study showed that the ZnAl mixed oxide obtained by the calcination of ZnAl LDH has a stable activity within the measured UV light irradiation range, whereas the parent ZnAl LDH catalyst did not perform satisfactory when low UV irradiation intensity is implied.
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