| Autor: |
Rao NN; Wastewater Technology Division, National Environmental Engineering Research Institute, Nehru Marg, Nagpur, 440020, India. wwtdiv@nagpur.dot.net.in, Dubey AK, Mohanty S, Khare P, Jain R, Kaul SN |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of hazardous materials [J Hazard Mater] 2003 Aug 01; Vol. 101 (3), pp. 301-14. |
| DOI: |
10.1016/s0304-3894(03)00180-8 |
| Abstrakt: |
The kinetics of photocatalytic (TiO(2)/UV) degradation of 2-chlorophenol (2-CP), characterization of intermediates and induction of biodegradability in treated chlorophenol solutions is reported. Approximately 95% of the 2-CP is removed in approximately 2h at pH 5 and 0.2g TiO(2)l(-1) when the 2-CP concentration is < or =100mgl(-1); the pseudo-first-order rate constant (k) is estimated to be 0.0183 min(-1). GC-MS analyses detected phenol, catechol, hydroxyhydroquinone (HHQ), and chlorohydroquinone (CHQ) intermediates during the short irradiation time (<1h); however two other higher carbon intermediates 2-hydroxy-benzaldehyde (HB) and [1.1'-biphenyl]-2,2'-diol (BPD) are found as major intermediates over longer irradiation times. The biochemical oxygen demand (BOD) of treated 2-CP solutions improved substantially. A tentative mechanistic pathway to explain formation of higher carbon intermediates is presented. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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