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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 catalyst and Hydrogen peroxide ratios on TOC removal and phenol oxidation (a),(d) [Phenol]0 = 100 mg / L, (b),(e) [Phenol]0 = 80 mg / L and (c), (f) [Phenol]0 = 60 mg / L.
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pone.0119933.g005: Effect of initial catalyst and Hydrogen peroxide ratios on TOC removal and phenol oxidation (a),(d) [Phenol]0 = 100 mg / L, (b),(e) [Phenol]0 = 80 mg / L and (c), (f) [Phenol]0 = 60 mg / L.

Mentions: Phenol in concentration of 100 mg /L was degraded with various catalyst oxidant ratios to determine the effect of goethite catalyst. A constant ratio of ferrous ion to initial phenol concentration was maintained. However, different mineralization rates were observed with changes in goethite and oxidant ratio. It was observed that the degradation rate increased by increasing ratio from 1: 0.3 to 1: 0.7. However, surprisingly, the degradation rate decreased with more hydrogen peroxide. This can be explained from the fact that with increase in hydrogen peroxide to Fe3+ catalyst ratio, more hydrogen peroxide is consumed in production of Fe2+ from Fe3+ compared to from mineralization of phenol. It can also be assumed that scavenging effect is one of the causes for decreased degradation rate. [40,41]. In acidic condition, phenol mineralization is more expeditious in the existence of ferrous sulphate. Generally, decrease in solution pH usually leads to intermediates formation (i.e. carboxylic acid, oxalic acid and formic acid) [39]. Fig. 5 shows phenol degradation and mineralization rate for different catalyst and oxidant ratios.


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 catalyst and Hydrogen peroxide ratios on TOC removal and phenol oxidation (a),(d) [Phenol]0 = 100 mg / L, (b),(e) [Phenol]0 = 80 mg / L and (c), (f) [Phenol]0 = 60 mg / L.
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getmorefigures.php?uid=PMC4388832&req=5

pone.0119933.g005: Effect of initial catalyst and Hydrogen peroxide ratios on TOC removal and phenol oxidation (a),(d) [Phenol]0 = 100 mg / L, (b),(e) [Phenol]0 = 80 mg / L and (c), (f) [Phenol]0 = 60 mg / L.
Mentions: Phenol in concentration of 100 mg /L was degraded with various catalyst oxidant ratios to determine the effect of goethite catalyst. A constant ratio of ferrous ion to initial phenol concentration was maintained. However, different mineralization rates were observed with changes in goethite and oxidant ratio. It was observed that the degradation rate increased by increasing ratio from 1: 0.3 to 1: 0.7. However, surprisingly, the degradation rate decreased with more hydrogen peroxide. This can be explained from the fact that with increase in hydrogen peroxide to Fe3+ catalyst ratio, more hydrogen peroxide is consumed in production of Fe2+ from Fe3+ compared to from mineralization of phenol. It can also be assumed that scavenging effect is one of the causes for decreased degradation rate. [40,41]. In acidic condition, phenol mineralization is more expeditious in the existence of ferrous sulphate. Generally, decrease in solution pH usually leads to intermediates formation (i.e. carboxylic acid, oxalic acid and formic acid) [39]. Fig. 5 shows phenol degradation and mineralization rate for different catalyst and oxidant ratios.

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.