Degradation of the Commercial Herbicide Glyphosate by Photo-Fenton Process: Evaluation of Kinetic Parameters and Toxicity

Souza, Danilo Rodrigues de; Trovó, Alam G.; Filho, Nelson Roberto Antoniosi; Silva, Marcos A. A.; Machado, Antônio Eduardo da Hora

doi:10.5935/0103-5053.20130185

Cited by 18 publications

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“…, the best results were obtained when hydrogels were loaded with a mixture of Fe(II) and Fe(III), reaching higher rates of decolourization. These results are in accordance with those reported by Souza et al , in which the synergic effect of Fe(II) and Fe(III) was detected, use of this mixture allowing an increase in the photo‐Fenton degradation levels. Therefore, the polyacrylamide hydrogel loaded with a mixture of Fe(II) and Fe(III) (henceforth Fe‐PH) was characterized and studied in detail for the electro‐Fenton process.…”

Section: Resultssupporting

confidence: 93%

Electro‐Fenton decolourization of dyes in batch mode by the use of catalytic activity of iron loaded hydrogels

Bocos

Pazos

2014

J of Chemical Tech & Biotech

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BACKGROUND: Electro-Fenton technology has demonstrated great potential for the degradation of recalcitrant organic contaminants in polluted wastewaters. In this technology, the decomposition of hydrogen peroxide is catalysed by the presence of iron, and powerful oxidants, hydroxyl radicals, are generated. However, there is concern over the reduction of iron released in the treated effluent. Therefore, retention of catalyst is required, and advances in electro-Fenton heterogeneous catalysis are necessary. In this study, the use of polyacrylamide hydrogel was evaluated as a support for the iron, and the performance of the catalyst (Fe-PH) developed was assayed in the electro-Fenton degradation of two dyes, Reactive Black 5 and Blue Sella Solid. RESULTS: First, the synthesis of Fe-PH catalyst was studied. The results showed that the loaded hydrogel with a mixture of Fe(II) and Fe(III) in 1:2 molar ratio reached the highest decolourization efficiency. The performance of the optimized Fe-PH catalyst was evaluated in the decolourization of the selected dyes. These studies demonstrated the satisfactory performance of electro-Fenton using Fe-PH catalyst as well as its reusability. CONCLUSION: In summary, the Fe-PH catalyst developed gives the promise of wastewater treatment by means of an electro-Fenton process.

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Section: Resultssupporting

confidence: 93%

Electro‐Fenton decolourization of dyes in batch mode by the use of catalytic activity of iron loaded hydrogels

Bocos

Pazos

2014

J of Chemical Tech & Biotech

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“…[14][15][16] Good degradation efficiencies have been reported using iron complexes 10 when compared with the use of the classic photo-Fenton process. [17][18][19][20] One of the advantages of some of these complexes, such as oxalate and citrate, 17,18,21 lies in the ability to absorb radiation, particularly in the visible, with expressive quantum yields. 18,22 However, in some situations, the advantage of using iron complexes is limited by the fact that certain target compounds form stable complexes with iron, which however are less active from the photocatalytic point of view.…”

Section: Introductionmentioning

confidence: 99%

Strategy for Treating a Landfill Leachate by Integration of Physico-Chemical and Photo-Fenton Processes

Silva¹,

Júnior²,

Silva³

et al. 2017

J. Braz. Chem. Soc.

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This study reports a protocol for the treatment of a sanitary landfill leachate through integration between a stage of coagulation-flocculation, a step of filtration of the resulting suspension, and application of the photo-Fenton process using a ferrioxalate complex and solar irradiation. The best results for turbidity removal by coagulation-flocculation were reached using Al 3+ as nitrate salt mainly using concentrations up close 4.4 mmol L -1 , at the natural pH of the effluent (pH 7.9), when the removal of 66% of the turbidity was achieved. By using a ferrioxalate complex after adjusting the pH of the effluent to 5, it was possible to circumvent the classical limitations of the Fenton process (related to the pH of the medium limited to between 2.5 and 3.0), performing a removal of 68% of the remaining dissolved organic carbon. The global dissolved organic carbon removal in this process was of 86% after a membrane filtration step before the photo-Fenton process.

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“…Paracetamol (N-acetyl-p-aminophenol, PCT), Figure 1a, among other pharmaceutical products, their metabolites, pesticides, hormones and herbicides, 9,[16][17][18][19][20] is calling attention due to its persistence in the environment and the inability of the sewage treatment plants in removing this contaminant, which may result in bioaccumulation and harmful consequences for ecosystems. 17,[20][21][22] Although PCT is metabolized mainly by the liver, up to 68% of this drug tends to be excreted in the urine when ingested within permitted levels.…”

Section: Introductionmentioning

confidence: 99%

“…The photocatalytic reactions using the nanocomposite were run in the absence and in the presence of H 2 O 2 at seven different concentrations of H 2 O 2 (16,33,66, 99, 120, 166 and 332 mg L ), and the degradation in the dark in the presence of H 2 O 2 .…”

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“…All the reactions were limited to 120 min. Aliquots were withdrawn every 20 min of reaction, filtered to remove the solids in suspension, and used for DOC analyses and determination of residual H 2 O 2 .The photocatalytic reactions using the nanocomposite were run in the absence and in the presence of H 2 O 2 at seven different concentrations of H 2 O 2 (16,33,66, 99, 120, 166 and 332 mg L ), and the degradation in the dark in the presence of H 2 O 2 . …”

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Efficient Mineralization of Paracetamol Using the Nanocomposite TiO₂/Zn(II) Phthalocyanine as Photocatalyst

França¹,

Santos²,

Silva³

et al. 2016

Journal of the Brazilian Chemical Society

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The photocatalytic performance of a composite based on the association of TiO 2 and 2.5 wt.% of zinc(II) phthalocyanine (TiO 2 /ZnPc) was evaluated towards the mineralization of paracetamol and compared to that observed for the bare oxide in different pH and H 2 O 2 concentrations. The results show that the photocatalytic performances were influenced by the pH, with maximum efficiency around the isoelectric point. Mineralization efficiencies between 86-91% was obtained using TiO 2 /ZnPc in pH 5.5-6.8, with 33 mg L -1 of H 2 O 2 , ca. 15% higher than that observed with TiO 2 . The mineralization efficiencies using bare TiO 2 and TiO 2 /ZnPc were respectively 112 and 18% lower in the absence of H 2 O 2 . The better performance of TiO 2 /ZnPc is related to its extended light absorption and non-uniform coating of the TiO 2 surface by ZnPc aggregates. Above pH 6.8, the mineralization efficiencies decrease for both photocatalysts, although the consumption of H 2 O 2 remains above 90%, due to its decomposition in alkaline pH.Keywords: mineralization, paracetamol, heterogeneous photocatalysis, role of pH and hydrogen peroxide, TiO 2 /zinc(II) phthalocyanine nanocomposite IntroductionSince initial studies by Fujishima and Honda, 1 heterogeneous photocatalysis 2 has attracted considerable attention due to its many technological applications, such as H 2 production, 3-5 CO 2 reduction, 6-8 environmental remediation, 9-12 among others. TiO 2 has been widely used in heterogeneous photocatalysis due its low cost, low toxicity, chemical and photochemical stability, usually expressive photocatalytic activity and versatility. 2,10,12,13 Its main limitation as photocatalyst is related to the lack of absorption in the visible region, which limits its use under solar irradiation. Several strategies have been employed to overcome this limitation, including doping 3 and production of nanocomposites. 9,[12][13][14] TiO 2 -based photocatalysis has been specially used in environmental remediation for the removal of recalcitrant and hazardous organic pollutants in wastewater. 9,15 The radicals produced from its excitation by light are able to efficiently oxidize organic pollutants leading in some cases to a complete mineralization of the organic matter.Paracetamol (N-acetyl-p-aminophenol, PCT), Figure 1a, among other pharmaceutical products, their metabolites, pesticides, hormones and herbicides, 9,16-20 is calling attention due to its persistence in the environment and the inability of the sewage treatment plants in removing this contaminant, which may result in bioaccumulation and harmful consequences for ecosystems. 17,[20][21][22] Although PCT is metabolized mainly by the liver, up to 68% of this drug tends to be excreted in the urine when ingested within permitted levels. [21][22][23][24] It should be emphasized that one of the routes of paracetamol metabolism produces highly toxic metabolites able to bind covalently to cysteine present in proteins. 23,25Figure 1. Chemical structure of PCT (a) and Zn(II) phthalocyanine (b). França e...

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Degradation of the Commercial Herbicide Glyphosate by Photo-Fenton Process: Evaluation of Kinetic Parameters and Toxicity

Cited by 18 publications

References 0 publications

Electro‐Fenton decolourization of dyes in batch mode by the use of catalytic activity of iron loaded hydrogels

Electro‐Fenton decolourization of dyes in batch mode by the use of catalytic activity of iron loaded hydrogels

Strategy for Treating a Landfill Leachate by Integration of Physico-Chemical and Photo-Fenton Processes

Efficient Mineralization of Paracetamol Using the Nanocomposite TiO₂/Zn(II) Phthalocyanine as Photocatalyst

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Degradation of the Commercial Herbicide Glyphosate by Photo-Fenton Process: Evaluation of Kinetic Parameters and Toxicity

Cited by 18 publications

References 0 publications

Electro‐Fenton decolourization of dyes in batch mode by the use of catalytic activity of iron loaded hydrogels

Electro‐Fenton decolourization of dyes in batch mode by the use of catalytic activity of iron loaded hydrogels

Strategy for Treating a Landfill Leachate by Integration of Physico-Chemical and Photo-Fenton Processes

Efficient Mineralization of Paracetamol Using the Nanocomposite TiO2/Zn(II) Phthalocyanine as Photocatalyst

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Product

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Efficient Mineralization of Paracetamol Using the Nanocomposite TiO₂/Zn(II) Phthalocyanine as Photocatalyst