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Degradation of polyvinyl alcohol in aqueous solutions using UV-365 nm/S2O8 2- process
Lin, Chia-Chang; Lee, Li-Ting & Hsu, Ling-Jung
Abstract
This investigation evaluates the effectiveness
of UV-365 nm/S2O8
2- process in degrading polyvinyl
alcohol in aqueous solutions. The effects of pH, Na2S2O8
dosage, and temperature on the degradation efficiency of
polyvinyl alcohol were studied. Under acidic conditions,
the degradation efficiency of polyvinyl alcohol exceeded
that under alkaline conditions. Additionally, a higher
Na2S2O8 dosage and a higher temperature were associated
with a higher degradation efficiency of polyvinyl alcohol.
The degradation rates of polyvinyl alcohol followed a
pseudo-first-order kinetic model. Moreover, the observed
degradation rate coefficient increased from 0.0078 to
0.4081 min-1 when the temperature was increased from 10
to 55 C. Also, the activation energy estimated using the
observed degradation rate coefficients and the Arrhenius
equation was 64 kJ/mol. At UV-365 nm, pH 3, an Na2S2O8
dosage of 0.06 g/L, a temperature of 55 oC, and an initial
polyvinyl alcohol concentration of 20 mg/L, around 100 %
of polyvinyl alcohol was degraded, indicating that UV-
365 nm/S2O8
2- process has great potential in degrading
polyvinyl alcohol in aqueous solutions.
Keywords
Degradation; Polyvinyl alcohol; UV irradiation; Persulfate
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