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Article
Author(s)
Bakari Chaka and Aloys Mosima Osano
Full-Text PDF XML 662 Views
DOI:10.17265/2328-7136/2019.04.008
Affiliation(s)
Department of Mathematics, and Physical Sciences, School of Science and Information Sciences, Maasai Mara University, Narok 20500, Kenya
ABSTRACT
Environmental pollution
especially in the form of effluent wastewater from industries has been a major
challenge. Carbonyl-containing organic standards and sewage sample were
effectively photo degraded. ZnO nanoparticles were prepared by emulsification
of zinc-carbamate solution using 1 N NaOH and grafted chemically by Molecular Layer
Doping method at 180 °C with β-carotene
extracted using methanol by refluxing at 50
°C at varying concentrations. Intrinsic and grafted
β-carotene ZnO were characterized using FTIR
(Fourier transform infrared spectroscopy)
and their spectra differed in an additional peak at around 1,435 nm corresponding to
the organ metallic bond Zn-C. UV-Vis spectra of the two composites indicated a
blue shift in the grafted samples. This translated to a reduced band gap from
3.5 eV to 3.4 eV. Comparison in the
rates of photodegradation of pure organic compounds, organic effluents and
color change of dyes was in the order 1% grafted, 0.5% grafted, intrinsic ZnO
and blank sample. When 10.0 mL of sewerage water was photo degraded using both
sunlight and UV-Lamp for 40 minutes, the amount of carbonyls present decreased
by 28.5% for β-carotene grafted ZnO, 24.5% for intrinsic ZnO and 0.6% for a
blank sample.
KEYWORDS
Intrinsic ZnO, β-carotene, organic effluents, carbonyls, photo-degradation.
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