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Journal of Radioanalytical and Nuclear Chemistry

, Volume 286, Issue 1, pp 287–293 | Cite as

Radiolysis of 1-naphthol in aqueous solutions

  • Thang M. Ngo
  • Nam M. Hoang
  • Tram T. M. Tran
Article

Abstract

The effects of absorbed doses, initial pH and 1-naphthol concentration onto its radiolysis in aqueous sulphuric and hydrochloric acids by gamma rays from 60Co were investigated. Under the experimental conditions, 1-naphthol degradation yields increased with increasing the absorbed doses (0.3–3.0 kGy) and with decreasing the initial 1-naphthol concentration (20–1 ppm). It was found out that the hydrated electrons did not play any significant roles in 1-naphthol radiolysis, as the degradation yields were higher at pH0 ~ 0.46 compared to those at pH0 ~ 2.0–5.0. The corresponding radiolytic yields G(−1-naphthol) were (6.13 ± 1.00)) × 10−2 and (5.11 ± 0.22) × 10−2 μmol/J in sulphuric acids, (15.61 ± 3.85) × 10−2 and (4.76 ± 0.48) × 10−2 μmol/J in hydrochloric acids. 1-Naphthol degradation rates could be described by the kinetic equations of pseudo-first-order reactions. An empirical relation between the observed reaction constants k D and the initial 1-naphthol concentrations was established, enabling to predict the absorbed doses required for a given treatment efficiency. Three products of 1-naphthol degradation were revealed using an HPLC/UV procedure.

Keywords

Gamma-radiolysis 1-Naphthol Water treatment 

Notes

Acknowledgements

This work was financially supported by the Department of Science and Technology (DOST)—Ho Chi Minh City’s People Committee.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2010

Authors and Affiliations

  • Thang M. Ngo
    • 1
  • Nam M. Hoang
    • 1
  • Tram T. M. Tran
    • 1
  1. 1.Faculty of Chemical EngineeringHo Chi Minh City University of TechnologyHo Chi Minh CityVietnam

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