Singlet molecular oxygen application for 2-chlorophenol removal.
A special kind of photocatalysis-a photosensitized oxidation involving singlet molecular oxygen ((1)O(2)) was applied to decomposition of 2-chlorophenol (2-CP) in water solution. The photoprocess was carried out in a homo- and heterogeneous system using rose bengal (RB) as a sensitizer. In the homogeneous solution the influence of initial 2-CP concentration and pH on reaction rate was observed. Based on the kinetic model, the rate constants of (1)O(2) quenching and reaction with 2-CP and the rate constant of excited sensitizer quenching by 2-CP were determined. In the heterogeneous system, silane gel was a carrier for the immobilized sensitizer. In order to estimate kinetic parameters, an attempt was made to describe the process using Langmuir-Hinshelwood (L-H) type mechanism. The Langmuir equilibrium constants for oxygen and 2-CP adsorbed on the gel surface were also estimated.
Gryglik
D
D
Faculty of Civil Engineering, Architecture and Environmental Engineering, Technical University of Lodz, 90-924 Lodz, Al. Politechniki 6, Poland. dorota.gryglik@p.lodz.pl
Miller
J S
JS
Ledakowicz
S
S
D000327:Adsorption; D002733:Chlorophenols / Q000737:chemistry* / Q000528:radiation effects*; D005456:Fluorescent Dyes / Q000737:chemistry / Q000528:radiation effects; D010084:Oxidation-Reduction; D017319:Photosensitizing Agents / Q000737:chemistry / Q000528:radiation effects; D012395:Rose Bengal / Q000737:chemistry / Q000528:radiation effects; D012821:Silanes / Q000737:chemistry; D026082:Singlet Oxygen / Q000737:chemistry*; D013472:Sunlight; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000528:radiation effects*; D018508:Water Purification / Q000379:methods
D002733:Chlorophenols; D005456:Fluorescent Dyes; D017319:Photosensitizing Agents; D012821:Silanes; D014874:Water Pollutants, Chemical; D026082:Singlet Oxygen; D012395:Rose Bengal; C040733:tetraethoxysilane; C030683:2-chlorophenol