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|Title:||Photocatalytic Oxidation of 2,4-Dinitrophenol in Aqueous Titanium Dioxide Slurries|
|Keywords:||Photocatalytic oxidation;Oxidation;2,4-Dinitrophenol;Titaniumdioxide slurries;Slurries|
|Abstract:||The heterogeneous photocatalytic oxidation of 2,4-dinitrophenol (2,4-DNP) was investigated in aqueous suspensions of TiO2 at the wavelength of 254nm by using an annular flow type photo-reactor with an 8W low-pressure mercury lamp as a UV -light source. For achieving higher photo-degradation efficiencies of 2,4-DNP, optimized conditions like, irradiation time, initial concentration of 2,4-dinitrophenol and catalyst load were established. The effect of oxygen supply and the optimum pH for achieving maximum degradation were also investigated. All the experiments were carried oul ill a batch recirculation mode. Experiments conducted at oxygenated and deoxygenated conditions indicate that the photo-degradation can be carried out through two different mechanisms. Optical density measurement (spectroscopy) was used to study the degradation. At a pH value of 3.5 and 10.5, maximum removal of 99 and 97 per cent was achieved within 3 h of irradiation time with an initial concentration of 4 x 10-4M.|
|ISSN:||0975-1084 (Online); 0022-4456 (Print)|
|Appears in Collections:||JSIR Vol.62(09) [September 2003]|
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