Photocatalytic degradation of boscalid in aqueous titaium dioxide suspension: Identification of intermediates and degradation pthways

  1. Lagunas-Allué, L. 12
  2. Martínez-Soria, M.-T. 1
  3. Sanz-Asensio, J. 1
  4. Salvador, A. 2
  5. Ferronato, C. 2
  6. Chovelon, J.M. 2
  1. 1 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

  2. 2 Claude Bernard University Lyon 1
    info

    Claude Bernard University Lyon 1

    Villeurbanne, Francia

    ROR https://ror.org/029brtt94

Journal:
Applied Catalysis B: Environmental

ISSN: 0926-3373

Year of publication: 2010

Volume: 98

Issue: 3-4

Pages: 122-131

Type: Article

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DOI: 10.1016/J.APCATB.2010.05.020 SCOPUS: 2-s2.0-77954657657 WoS: WOS:000280541200003 GOOGLE SCHOLAR

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Abstract

The photocatalytic degradation of boscalid in aqueous suspensions was investigated by using titanium dioxide (TiO2) as a photocatalyst. Accordingly, a complete degradation of fungicide was achieved by applying the optimal operational conditions of 2.5gL-1 of catalyst, natural pH of 6.0 and the temperature at 20±1°C after 90min irradiation. Photodegradation of boscalid exhibited pseudo-first-order reaction kinetics. The rate of photodecomposition of boscalid was measured using high performance liquid chromatography-diode array detector (HPLC-DAD) while its mineralization was followed using total organic carbon (TOC) analysis. The influence of physicochemical parameters such as photonic flux, presence of inorganic cations and anions, pH and oxygen concentration on the kinetic process was studied. The identification of reaction intermediate products was carried out using coupled techniques HPLC-MS/MS after a SPE pre-concentration step and a degradation pathway was proposed. By this technique, 17 degradation products were identified. © 2010 Elsevier B.V.