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Degradation and mineralization of phenol compounds with goethite catalyst and mineralization prediction using artificial intelligence.

Tisa F, Davoody M, Abdul Raman AA, Daud WM - PLoS ONE (2015)

Bottom Line: The efficiency of phenol degradation via Fenton reaction using mixture of heterogeneous goethite catalyst with homogeneous ferrous ion was analyzed as a function of three independent variables, initial concentration of phenol (60 to 100 mg /L), weight ratio of initial concentration of phenol to that of H2O2 (1: 6 to 1: 14) and, weight ratio of initial concentration of goethite catalyst to that of H2O2 (1: 0.3 to 1: 0.7).Two separate models were developed using artificial neural networks to predict degradation percentage by a combination of Fe3+ and Fe2+ catalyst.Satisfactory agreement was observed between testing data and the predicted values (R2Phenol = 0.9214 and R2TOC= 0.9082).

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical Engineering, Faculty of Engineering, University of Malaya,50603 Kuala Lumpur, Malaysia.

ABSTRACT
The efficiency of phenol degradation via Fenton reaction using mixture of heterogeneous goethite catalyst with homogeneous ferrous ion was analyzed as a function of three independent variables, initial concentration of phenol (60 to 100 mg /L), weight ratio of initial concentration of phenol to that of H2O2 (1: 6 to 1: 14) and, weight ratio of initial concentration of goethite catalyst to that of H2O2 (1: 0.3 to 1: 0.7). More than 90 % of phenol removal and more than 40% of TOC removal were achieved within 60 minutes of reaction. Two separate models were developed using artificial neural networks to predict degradation percentage by a combination of Fe3+ and Fe2+ catalyst. Five operational parameters were employed as inputs while phenol degradation and TOC removal were considered as outputs of the developed models. Satisfactory agreement was observed between testing data and the predicted values (R2Phenol = 0.9214 and R2TOC= 0.9082).

No MeSH data available.


Effect of initial phenol concentration on TOC removal and phenol oxidation at different Phenol conc.: Hydrogen peroxide conc. ratios (a),(d) [Phenol]0: [H2O2] = 1: 6, (b),(e) [Phenol]0: [H2O2] = 1: 10 and (c), (f) [Phenol]0: [H2O2] = 1: 14.
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pone.0119933.g003: Effect of initial phenol concentration on TOC removal and phenol oxidation at different Phenol conc.: Hydrogen peroxide conc. ratios (a),(d) [Phenol]0: [H2O2] = 1: 6, (b),(e) [Phenol]0: [H2O2] = 1: 10 and (c), (f) [Phenol]0: [H2O2] = 1: 14.

Mentions: A number of competing factors may possibly help acquire the best possible degradation and mineralization rate. Firstly, hydroxyl radicals produced for phenol mineralization are available with enhancement of total iron availability in the solution. The mechanism follows (equation 7) and (8). Secondly, the reaction between ferric ions and hydrogen peroxide that produces HO2 radical, which is comparatively much less reactive than hydroxyl radical, becomes vital at a higher total iron concentration [37]. Besides, the scavenging reactions which become predominant in presence of high amount of hydrogen peroxide and catalyst, affect the degradation and mineralization rate. In this study, phenol mineralization was not obtained in absence of iron which can be supported by the fact that no degradation takes place when there is only hydrogen peroxide. The degradation and mineralization rate could be observed over time in Fig. 3. Based on this figure, higher mineralization and degradation were observed for comparatively lower initial phenol concentration at the same ratio of phenol to hydrogen peroxide concentration.


Degradation and mineralization of phenol compounds with goethite catalyst and mineralization prediction using artificial intelligence.

Tisa F, Davoody M, Abdul Raman AA, Daud WM - PLoS ONE (2015)

Effect of initial phenol concentration on TOC removal and phenol oxidation at different Phenol conc.: Hydrogen peroxide conc. ratios (a),(d) [Phenol]0: [H2O2] = 1: 6, (b),(e) [Phenol]0: [H2O2] = 1: 10 and (c), (f) [Phenol]0: [H2O2] = 1: 14.
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Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4388832&req=5

pone.0119933.g003: Effect of initial phenol concentration on TOC removal and phenol oxidation at different Phenol conc.: Hydrogen peroxide conc. ratios (a),(d) [Phenol]0: [H2O2] = 1: 6, (b),(e) [Phenol]0: [H2O2] = 1: 10 and (c), (f) [Phenol]0: [H2O2] = 1: 14.
Mentions: A number of competing factors may possibly help acquire the best possible degradation and mineralization rate. Firstly, hydroxyl radicals produced for phenol mineralization are available with enhancement of total iron availability in the solution. The mechanism follows (equation 7) and (8). Secondly, the reaction between ferric ions and hydrogen peroxide that produces HO2 radical, which is comparatively much less reactive than hydroxyl radical, becomes vital at a higher total iron concentration [37]. Besides, the scavenging reactions which become predominant in presence of high amount of hydrogen peroxide and catalyst, affect the degradation and mineralization rate. In this study, phenol mineralization was not obtained in absence of iron which can be supported by the fact that no degradation takes place when there is only hydrogen peroxide. The degradation and mineralization rate could be observed over time in Fig. 3. Based on this figure, higher mineralization and degradation were observed for comparatively lower initial phenol concentration at the same ratio of phenol to hydrogen peroxide concentration.

Bottom Line: The efficiency of phenol degradation via Fenton reaction using mixture of heterogeneous goethite catalyst with homogeneous ferrous ion was analyzed as a function of three independent variables, initial concentration of phenol (60 to 100 mg /L), weight ratio of initial concentration of phenol to that of H2O2 (1: 6 to 1: 14) and, weight ratio of initial concentration of goethite catalyst to that of H2O2 (1: 0.3 to 1: 0.7).Two separate models were developed using artificial neural networks to predict degradation percentage by a combination of Fe3+ and Fe2+ catalyst.Satisfactory agreement was observed between testing data and the predicted values (R2Phenol = 0.9214 and R2TOC= 0.9082).

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical Engineering, Faculty of Engineering, University of Malaya,50603 Kuala Lumpur, Malaysia.

ABSTRACT
The efficiency of phenol degradation via Fenton reaction using mixture of heterogeneous goethite catalyst with homogeneous ferrous ion was analyzed as a function of three independent variables, initial concentration of phenol (60 to 100 mg /L), weight ratio of initial concentration of phenol to that of H2O2 (1: 6 to 1: 14) and, weight ratio of initial concentration of goethite catalyst to that of H2O2 (1: 0.3 to 1: 0.7). More than 90 % of phenol removal and more than 40% of TOC removal were achieved within 60 minutes of reaction. Two separate models were developed using artificial neural networks to predict degradation percentage by a combination of Fe3+ and Fe2+ catalyst. Five operational parameters were employed as inputs while phenol degradation and TOC removal were considered as outputs of the developed models. Satisfactory agreement was observed between testing data and the predicted values (R2Phenol = 0.9214 and R2TOC= 0.9082).

No MeSH data available.