1 Ocak 2018 Dergi makalesi Açık Erişim

Okcu, Gamze Dogdu; Pakdil, Nazli Baldan; Okten, Hatice Eser; Yalcuk, Arda

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    <subfield code="a">A Box-Behnken design (BBD) optimization of the photocatalytic degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) using TiO2/H2O</subfield>
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    <subfield code="a">2,4-Dichlorophenoxyacetic acid (2,4-D), a chlorinated phenoxy-alkanoic herbicide, is used extensively in agriculture. This work investigates TiO2/H2O2 mediated UV photocatalytic degradation of 2,4-D in a laboratory-scale photoreactor. Three levels of Box-Behnken design technique, combined with response surface methodology (RSM), were used to design the experiments. Two kinds of multivariate experimental design (pH, TiO2, and 2,4-D concentration) and (pH, TiO2, and H2O2 concentrations) were employed to establish two quadratic models (Model 1 and Model 2), showing the functional relationship between degradation rate of 2,4-D and three independent experimental parameters. Model 1 predicted optimum values for pH, TiO2, and 2,4-D concentrations to be 5.7, 1.20 g L-1, and 32 mg L-1, respectively. Model 2 predicted optimum values for pH, TiO2, and initial H2O2 concentrations to be 4.94, 1.34 g L-1, and 161 mg L-1. Degradation rate of 2,4-D approached 78.10% for Model 1 and 83.63% for Model 2. For both models, similar results were obtained through optimizing variables by RSM and using single factorial batch reactor operation. Regression analysis showed good agreement between experimental results and predictive values for Models 1 and 2, with R-2 values of 0.9958 and 0.9976, respectively.</subfield>
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    <subfield code="u">Abant Izzet Baysal Univ, Dept Environm Engn, Fac Engn &amp; Architecture, Golkoy Campus Bolu, Bolu, Turkey</subfield>
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