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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 2, 2015, pp. 603-616
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Bioline Code: st15055
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 2, 2015, pp. 603-616
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Photocatalytic degradation of tetracycline using nanosized titanium dioxide in aqueous solution
Safari, G.H.; Hoseini, M.; Seyedsalehi, M.; Kamani, H.; Jaafari, J. & Mahvi, A.H.
Abstract
The aim of the study was to investigate the
degradation kinetics of tetracycline antibiotic by nanosized
titanium dioxide under ultraviolet irradiation.
Enhancement of photocatalysis by addition of Hydrogen
peroxide was also evaluated. Various experimental
parameters such as initial tetracycline concentrations,
initial titanium dioxide concentration, initial pH, reaction
times, initial Hydrogen peroxide concentrations, as well
as water matrix using ultrapure water, drinking water and
secondary effluent were investigated. The initial rate of
photocatalytic degradation of tetracycline well fitted the
Langmuir–Hinshelwood kinetic model (R2 = 0.9926)
with a reaction rate constant of 1.4 mg/L min. The
degradation rate depended on initial tetracycline concentration
and initial pH. The degradation rate also increased
with higher titanium dioxide density and reached a plateau
at titanium dioxide concentration of 1.0 g/L. The
tetracycline degradation rate was higher in drinking water
compared to ultrapure water. The addition of Hydrogen
peroxide to titanium dioxide suspension significantly
enhanced the tetracycline degradation rate and substantially
reduced the time required to degrade 100 % of
tetracycline. Changes of chemical oxygen demand values
during photolysis indicated that tetracycline transformed
into intermediate products without complete mineralization.
The ultraviolet visible spectra obtained before and
after ultraviolet irradiation in the presence of titanium
dioxide can indicate the formation of 4a,12a-anhydro-4-
oxo-4- dimethylaminotetracycline.
Keywords
Advanced oxidation process; Hydrogen peroxide; Kinetics; Photocatalysis; Ultraviolet radiation
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