Catalytic ozonation of model organic compounds in aqueous solution promoted by metallic oxides
Mansouri, L; Sabelfeld, M; Geissen, S; Bousselmi, L
| HERO ID | 3537179 |
|---|---|
| In Press | No |
| Year | 2015 |
| Title | Catalytic ozonation of model organic compounds in aqueous solution promoted by metallic oxides |
| Authors | Mansouri, L; Sabelfeld, M; Geissen, S; Bousselmi, L |
| Journal | Desalination and Water Treatment |
| Volume | 53 |
| Issue | 4 |
| Page Numbers | 1089-1100 |
| Abstract | Removal of Diethyl phthalate (DEP) from water has been accomplished through catalytic ozonation promoted by TiO2 and Al2O3. A laboratory setup was designed to evaluate and select the optimal oxidation process. The degradation rate is strongly dependant on the pH, initial concentrations of the phthalate, catalyst dosage, and O-3 dosage. The effect of these parameters has been studied. Results show that the addition of Al2O3 was effective to achieve almost 95% degradation of DEP in about 30min using 2g L-1 as compared to over 50min with TiO2. It was also found that radical reactions were the main mechanism by which DEP was degraded and adsorption has a small contribution to the removal of DEP by O-3/TiO2 and Al2O3 processes. Indeed, after 60min, adsorption alone achieved only about 12.5 and 15.5% removal, respectively, in the presence of TiO2 and Al2O3. Under same conditions, the kinetics of degradation was found to follow first-order reaction rules for both systems. After 1h treatment, the rate constant of DEP removal were 0.0093 and 0.053min(-1) using O-3/AlO3 and O-3/TiO2 processes, respectively. The O-3/Al2O3 system proved to be the most efficient and occurs at a much higher oxidation rate than O-3/TiO2 system and allows achieving 100% degradation of DEP (100 mg L-1) in 25min of reaction time. The notable decrease of DEP removal rate observed in the presence of radical scavenger tert-butanol indicates that the reaction between DEP and OH center dot proceeds mainly in the bulk of the aqueous phase. The results of the study showed that O- 3/TiO2 and O-3/Al2O3 systems were effective and economic treatment processes for DEP under neutral conditions by producing higher mineralization efficiency in a relatively short ozonation time compared to ozone alone process. |
| Doi | 10.1080/19443994.2013.860630 |
| Wosid | WOS:000349083600001 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Scopus URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84922444528&doi=10.1080%2f19443994.2013.860630&partnerID=40&md5=769a7a1057716257a27c5800071fb248 |
| Is Public | Yes |
| Language Text | English |
| Keyword | Al2O3; TiO2; catalyst; Catalytic ozonation; Degradation; Diethyl phthalate |