Modeling and optimization of photo-Fenton degradation of 2,4-D using ferrioxalate complex and response surface methodology (RSM)

Schenone, Agustina Violeta; Conte, Leandro; Botta, María Florencia; Alfano, Orlando Mario

doi:10.1016/j.jenvman.2015.03.028

Cited by 79 publications

(32 citation statements)

References 29 publications

(34 reference statements)

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“…The authors showed that under these conditions, Fe 3+ ions are not precipitated in the form of hydroxide, while Fe(C 2 O 4 ) 3 3− ions constitute the dominant form of ferro-silicate complexes. Similarly, studies Schenone et al (2015) indicated that the use of ferriooxalate complex as a source of iron enables effective degradation of 2,4-D at pH 5 (Table 3).…”

Section: Fe(oh) 3 and Other Insoluble Iron Species Can Bementioning

confidence: 95%

“…Loos et al (2009) Zertal et al 2004) exceeded the EU (European Union) limit, and mean concentrations were estimated at 0.022 μg L −1 and 0.015 μg L −1 , respectively (Loos et al 2009). In Poland (Krzyżanowski 2008;Sadowski et al 2009;Sadowski et al 2014 Glozier et al 2012), the USA (Ensminger et al 2013;DaSilva 2016), and Australia (Schult 2016).…”

Section: Phenoxy Acid Levels In Groundwater and Surface Watermentioning

confidence: 99%

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Occurrence and transformation of phenoxy acids in aquatic environment and photochemical methods of their removal: a review

Muszyński

Brodowska

Paszko

2019

Environ Sci Pollut Res

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The article presents the behavior of phenoxy acids in water, the levels in aquatic ecosystems, and their transformations in the water environment. Phenoxy acids are highly soluble in water and weakly absorbed in soil. These highly mobile compounds are readily transported to surface and groundwater. Monitoring studies conducted in Europe and in other parts of the world indicate that the predominant phenoxy acids in the aquatic environment are mecoprop, 4-chloro-2-methylphenoxyacetic acid (MCPA), dichlorprop, 2,4-dichlorophenoxyacetic acid (2,4-D), and their metabolites which are chlorophenol derivatives. In water, the concentrations of phenoxy acids are effectively lowered by hydrolysis, biodegradation, and photodegradation, and a key role is played by microbial decomposition. This process is determined by the qualitative and quantitative composition of microorganisms, oxygen levels in water, and the properties and concentrations of phenoxy acids. In shallow and highly insolated waters, phenoxy acids can be decomposed mainly by photodegradation whose efficiency is determined by the form of the degraded compound. Numerous studies are underway on the use of advanced oxidation processes (AOPs) to remove phenoxy acids. The efficiency of phenoxy acid degradation using AOPs varies depending on the choice of oxidizing system and the conditions optimizing the oxidation process. Most often, methods combining UV radiation with other reagents are used to oxidize phenoxy acids. It has been found that this solution is more effective compared with the oxidation process carried out using only UV.

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Section: Fe(oh) 3 and Other Insoluble Iron Species Can Bementioning

confidence: 95%

Section: Phenoxy Acid Levels In Groundwater and Surface Watermentioning

confidence: 99%

Occurrence and transformation of phenoxy acids in aquatic environment and photochemical methods of their removal: a review

Muszyński

Brodowska

Paszko

2019

Environ Sci Pollut Res

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“…That is to say, the test method to predict the separated efficiency between chalcopyrite and molybdenite was reliable in this research. The adequate precision ratio (AP, precision criterion) was 65.21/43.73 (>4), and the coefficient of variance (CV, precision criterion) was 0.84/4.60% (<10%), proving the high accuracy of the predictive model [30][31][32]. The multivariate correlation coefficient R 2 equal to 0.997/0.994 means that the model could explain the change of the response value to the extent of 99.7%/99.4% for chalcopyrite and molybdenite, respectively.…”

Section: Model Fittings and Statistical Analysismentioning

confidence: 96%

The Effect of Seaweed Glue in the Separation of Copper–Molybdenum Sulphide Ore by Flotation

Chen

et al. 2018

Minerals

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Flotation separation of chalcopyrite from molybdenite was studied using seaweed glue (SEG) as a depressant. Flotation process and mechanism were examined by response surface methodology, flotation tests, adsorption tests, zeta potential measurements and fourier transform infrared (FT-IR) spectra. Response surface methodology with a Box-Behnken design suggested the optimal reagent schedule: pH 4, depressant seaweed glue 197 mg/L, collector amyl xanthate 16 mg/L and frother (methyl isobutyl carbinol) 20 mg/L, and selective separation of chalcopyrite and molybdenite was achieved by flotation. Comparison of SEG and traditional depressants indicated that the SEG could achieve a similar separation efficiency, and exhibited the advantages of environmental compatibility and economic adaptability. Co-adsorption of seaweed glue and amyl xanthate occurred on the surface of molybdenite, and is explained to happen through distinct mechanisms due to the heterogeneous nature of the surface. It is likely that seaweed glue depresses molybdenite by covering the dixanthogen resulting from adsorption of xanthate ions. It is shown that seaweed glue is as effective a depressant of Cu/Mo separation as cyanide.

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“…Several experimental design approaches such as the 3k factorial [12,13], Doehlert [14], Box-Behnken and central composite designs (CCDs) [15][16][17] were applied to optimise the effective parameters in photoreactor systems. Also, chemometric methods such as SVD, EFA, and MCR-ALS [18,19] were recommended to determine kinetic of organic molecules degradation [20].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of crystal violet by thiourea-doped TiO2 thin film fixed bed photoreactors under visible irradiation: Optimisation using central composite designs and kinetics studies by multivariate curve resolution

Khalilian¹,

Semnani²,

Nekoeinia³

2018

Bull. Chem. Soc. Eth.

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ABSTRACT. In this study, optimisation of the photocatalytic behaviour of crystal violet (CV) by thiourea (Tu)-codoped TiO2 thin film in fixed bed photoreactor was investigated by central composite designs (CCDs). The effective variables were pH, the concentration of CV dye, flow rate and reaction time. The results of the CCD model showed a good agreement with experimental results, with R 2 = 0.9680 (p < 0.0001) and maximum degradation efficiency was obtained at the optimum conditions: dye concentration 8.5 mg/L, pH 9, flow rate 6 mL/min and reaction time 80 min. Subsequently, three absorbing chemical compounds presented in the degradation reaction were obtained by using singular value decomposition (SVD) method and evolving factor analysis (EFA). Then a multivariate curve resolution with alternating least squares (MCR-ALS) was performed to achieve the concentration and spectral profiles for each component. Finally, a hard modelling method was applied to determine the kinetic constants of distinct reactions occurred in the photocatalytic degradation process. The reaction rate constants were calculated for the first and second steps as k1 = 0.08327 (SD = ±0.0015) /min and k2 = 0.045 (SD = ±0.0006)/min, respectively.

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Modeling and optimization of photo-Fenton degradation of 2,4-D using ferrioxalate complex and response surface methodology (RSM)

Cited by 79 publications

References 29 publications

Occurrence and transformation of phenoxy acids in aquatic environment and photochemical methods of their removal: a review

Occurrence and transformation of phenoxy acids in aquatic environment and photochemical methods of their removal: a review

The Effect of Seaweed Glue in the Separation of Copper–Molybdenum Sulphide Ore by Flotation

Photocatalytic degradation of crystal violet by thiourea-doped TiO2 thin film fixed bed photoreactors under visible irradiation: Optimisation using central composite designs and kinetics studies by multivariate curve resolution

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