| Autor: |
Tipayarom, Danutawat1,2, Wantala, Kitirote3, Grisdanurak, Nurak4 gnurak@engr.tu.ac.th |
| Předmět: |
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| Zdroj: |
Fresenius Environmental Bulletin. 2011, Vol. 20 Issue 6, p1425-1431. 7p. |
| Abstrakt: |
Experimental design was employed to identify the optimum operating conditions for sonophotocatalytic degradation of alachior using S-doped TiO2 under visible light. A response surface methodology based on the Box-Behnken design was used. Three operational variables of alachlor degradation were investigated: the initial alachior concentration, catalyst loading, and ultrasonic power intensity. Sonophotocatalysis, the combination of photocatalysis and sonolysis, was employed on the widely used herbicide alachlor in an aqueous solution with S-doped TiO2 under a wide range of visible light. The sonophotocatalytic degradation of alachlor was statistically investigated. The experimental design model predicted a quadratic model as a function of the relationship between the alachlor removal efficiency and the independent variables. The correlation coefficient (R2) between the experimental data and model data was 0.98. The obtained optimum operating conditions for achieving 85% alachlor removal were an alachlor concentration of I mg U-1, a catalyst loading of 1.785 g U-1, and an ultrasonic power intensity of 0.55 W mL-1 (44 W in 80 mL). In addition, the model results proposed that ultrasonic power increased the alachlor removal efficiency. It may be concluded that response surface methodology based on the Box-Behnken design can be a precise and reliable technique for optimizing the operating conditions of alachlor degradation using sonophotcatalytic activities. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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