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Degradation of polyvinyl alcohol in aqueous solutions using UV-365 nm/S2O8 2− process

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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 °C, 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.

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Acknowledgments

The authors would like to thank the National Science Council of the Republic of China, Taiwan, for financially supporting this research under Contract No. NSC 100-2815-C-182-019-E.

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Authors and Affiliations

  1. Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan, Taiwan, ROC

    Chia-Chang Lin, Li-Ting Lee & Ling-Jung Hsu

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  1. Chia-Chang Lin
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  2. Li-Ting Lee
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Correspondence to Chia-Chang Lin.

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Lin, CC., Lee, LT. & Hsu, LJ. Degradation of polyvinyl alcohol in aqueous solutions using UV-365 nm/S2O8 2− process. Int. J. Environ. Sci. Technol. 11, 831–838 (2014). https://doi.org/10.1007/s13762-013-0280-6

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  • DOI: https://doi.org/10.1007/s13762-013-0280-6

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