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Experimental design of 2,4-diclorophenol oxidation by Fenton's reaction
| Summary: | An experimental design methodology has been drawn regarding the model contaminant 2,4-dichlorophenol(2,4-DCP) oxidation using Fenton's reagent. This multivariable and multilevel approach allowed us toinvestigate the effects between the experimental variables (temperature and iron(II) and hydrogen peroxideconcentrations) in the process performance, with the minimum number of experiments. Response factorsconsidered were 2,4-DCP degradation after 5, 10, and 20 min of reaction time, for an initial 2,4-DCPconcentration of 100 mg/L. This approach provided statistically significant models, which allowed processoptimization. It was found that, within the range studied, the ferrous concentration has a positive effect onthe oxidation performance. However, for the peroxide load, and particularly for temperature, an optimal valueexists that must be taken into account in order to obtain the best results. Besides, the optimal conditionsdepend on the response considered, with it being advisable to use less-aggressive conditions if responses aretaken at longer reaction times. Finally, the kinetic model proposed was useful for predicting the evolution ofthe 2,4-DCP concentration within the batch reactor over time. Moreover, this kinetic analysis also allowed usto establish the reaction rate for 2,4-DCP degradation. |
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| Subject: | Ciências Tecnológicas Technological sciences |
| Country: | Portugal |
| Document type: | journal article |
| Access type: | Restricted |
| Associated institution: | Repositório Aberto da Universidade do Porto |
| Language: | English |
| Origin: | Repositório Aberto da Universidade do Porto |
| Summary: | An experimental design methodology has been drawn regarding the model contaminant 2,4-dichlorophenol(2,4-DCP) oxidation using Fenton's reagent. This multivariable and multilevel approach allowed us toinvestigate the effects between the experimental variables (temperature and iron(II) and hydrogen peroxideconcentrations) in the process performance, with the minimum number of experiments. Response factorsconsidered were 2,4-DCP degradation after 5, 10, and 20 min of reaction time, for an initial 2,4-DCPconcentration of 100 mg/L. This approach provided statistically significant models, which allowed processoptimization. It was found that, within the range studied, the ferrous concentration has a positive effect onthe oxidation performance. However, for the peroxide load, and particularly for temperature, an optimal valueexists that must be taken into account in order to obtain the best results. Besides, the optimal conditionsdepend on the response considered, with it being advisable to use less-aggressive conditions if responses aretaken at longer reaction times. Finally, the kinetic model proposed was useful for predicting the evolution ofthe 2,4-DCP concentration within the batch reactor over time. Moreover, this kinetic analysis also allowed usto establish the reaction rate for 2,4-DCP degradation. |
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