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      Humic-like substances extracted from composts can promote the photodegradation of Irgarol 1051 in solar light.

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          Abstract

          Humic-like substances (HLS) were extracted from a mixture of sewage sludges and trimmings (70-30%, w/w) after different times of composting (0, 70 days and 130 days). HLS were analyzed by elemental analysis, UV-visible and fluorescence spectroscopy and also tested for their ability to photosensitize the degradation of Irgarol. The rate of Irgarol photodegradation in artificial solar light was found to be 2.5- to 4.3-fold higher in the presence of HLS than in buffered Milli-Q water. These results were confirmed by experiments in solar light that evidenced the photodegrading properties of HLS in a more striking way. Using 2-propanol as hydroxyl radical scavenger, we could show that hydroxyl radicals contributed to the photosensitized Irgarol degradation for about 25%. The photodegrading activity of HLS, their absorbance and their emissive properties were all found to increase between 0 and 70 days of composting and to remain quite constant between 70 and 130 days. The degree of humification varied in the same way, linking all these properties to the humification process.

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          Author and article information

          Journal
          Chemosphere
          Chemosphere
          Elsevier BV
          0045-6535
          0045-6535
          Feb 2006
          : 62
          : 6
          Affiliations
          [1 ] Laboratoire de Photochimie Moléculaire et Macromoléculaire, UMR CNRS-Université Blaise Pascal 6505, 63177 Aubière Cedex, France.
          Article
          S0045-6535(05)00841-6
          10.1016/j.chemosphere.2005.06.023
          16081135
          f588e1c4-f2ed-4bf4-a7d9-7902a3cb48d6
          History

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