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Heterogeneous photocatalytic degradation of monochlorobenzene in water
- Source :
- Journal of Hazardous Materials. 156:186-193
- Publication Year :
- 2008
- Publisher :
- Elsevier BV, 2008.
-
Abstract
- This investigation evaluated the photocatalytic degradation of monochlorobenzene (MCB) in an aqueous TiO 2 suspension. In accordance with the experimental results, the degradation of MCB was a function of the initial substrate concentration, incident light intensity, and TiO 2 dosage. However, the solution pH had insignificant effect on the degradation efficiency. The heterogeneous photocatalytic degradation of MCB followed the Langmuir–Hinshelwood kinetics. The adsorption coefficient of MCB ( K ) and the observed degradation rate constant ( k ) were calculated as 13.4 mM −1 and 0.0054 mM min −1 , respectively. In addition, a 0.255 dependency of the initial degradation rate on the light intensity revealed the considerable adverse effect of e − –h + pair recombination. Both mineralization and dechlorination occurred during the photocatalytic degradation of MCB. Under the operating condition of initial MCB concentration of 0.1 mM, light intensity of 5.68 μEinstein s −1 , TiO 2 dosage of 1.0 g L −1 , and solution pH of 7, about 93.7% of MCB was mineralized after 240 min of irradiation. Nevertheless, 64.3% of the stoichiometric amount of Cl − ions was released into the bulk solution. The simulation results derived from the X-ray photoelectron spectroscopy (XPS) analysis was suggested that the interaction between Cl − ions and TiO 2 surface tended to lower the released amount of Cl − ions.
- Subjects :
- Environmental Engineering
Photochemistry
Ultraviolet Rays
Health, Toxicology and Mutagenesis
Inorganic chemistry
Kinetics
Chlorobenzenes
Catalysis
chemistry.chemical_compound
Adsorption
Reaction rate constant
Environmental Chemistry
Waste Management and Disposal
Titanium
Aqueous solution
Chemistry
Spectrum Analysis
X-Rays
Hydrogen-Ion Concentration
Pollution
Light intensity
Titanium dioxide
Degradation (geology)
Water Pollutants, Chemical
Subjects
Details
- ISSN :
- 03043894
- Volume :
- 156
- Database :
- OpenAIRE
- Journal :
- Journal of Hazardous Materials
- Accession number :
- edsair.doi.dedup.....f7a1bd485381b6613a92cb0dec2c609a