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- Title
Polyaniline/ZnO composites prepared via a green route for sunlight-driven photocatalytic efficient decolorization of methyl orange dye.
- Authors
Kadri, Yasmine; Srasra, Ezzeddine; Bekri-Abess, Imen
- Abstract
Hybrid composites formed by semi-conductor metal oxide (ZnO) and conducting polymer (PANI) were prepared by simple, efficient, low-cost and environmentally-friendly methods, namely mechano-chemical reaction and a solution combustion synthesis. X-ray diffraction, scanning electron microscopy, Fourier-transform infrared spectroscopy, UV-Visible, laser granulometry, Raman and photoluminescence (PL) spectroscopies were carried out to study the effect of both the grinding time and weight percent ratio of ZnO:PANI on the structure and morphology of ZnO/PANI composites. The X-ray diffraction results show that solution combustion synthesis gave a wurtzite hexagonal structure of pure ZnO and ZnO/x wt.% PANI composites contained zinc oxide with a semi-crystalline phase of polyaniline. Experimental findings demonstrate that the decrease of the grain size particles from 42.15 to 24.49 μm, for ZnO/60 wt.% PANI and the grinding time increase were accompanied by the reduction of PL intensity and electron-hole recombination. The effect of the percentage of polyaniline in the composites on the photodegradation reaction of methyl orange (MO) was also investigated. UV-Vis spectrophotometer findings reveal the adsorption of UV irradiation by all composites and, hence, the decomposition of MO. ZnO/60 wt.% PANI showed good photocatalytic behaviour towards MO dye with a decoloration percentage of 90% after being exposed to sunlight irradiation during 1 h. This rate is six times higher than ZnO in the same conditions. It was obvious that the prolongation of the charge-carrier recombination time, resulting from sensitizing by polymer and activation by grinding, improved the efficiency of the studied composites towards the photocatalytic degradation of MO.
- Publication
Desalination & Water Treatment, 2022, Vol 270, p245
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2022.28783