Degradation of atrazine by cobalt-mediated activation of peroxymonosulfate: Different cobalt counteranions in homogenous process and cobalt oxide catalysts in photolytic heterogeneous process

Chan, K. H.; Chu, Wei

doi:10.1016/j.watres.2009.02.029

Cited by 421 publications

(121 citation statements)

References 42 publications

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“…and Fe 2? as activators was in accordance with the following simplified reactions (Chan and Chu 2009;Anipsitakis et al 2006;Rastogi et al 2009): Figure 1 shows the influence of various operating parameters in the removal of DEET using PMS. A faster and more efficient method of DEET removal was observed when Co 2?…”

Section: Degradation Of Deet Using Pms Activated By Iron (Ii) and Cobmentioning

confidence: 74%

“…available for the activation of PMS (Chan and Chu 2009). The influence of counteranions for the DEET removal was performed using nitrate, sulfate and chloride salts of Co 2?…”

Section: Degradation Of Deet Using Pms Activated By Iron (Ii) and Cobmentioning

confidence: 99%

“…Since the degradation mechanisms of organic pollutants via SO 4 -Á -based oxidation are different from ÁOH-mediated oxidation, the effectiveness of SO 4 -Á -based oxidation in treating various organic pollutants with a great diversity of molecular structure and chemical properties should be evaluated (Nfodzo and Choi 2011). So far, the treatment of organic pollutants such as atrazine (Chan and Chu 2009), pharmaceuticals and personal care products (e.g. Chan et al 2010;Matta et al 2011;Nfodzo and Choi 2011;Rickman and Mezyk 2010), methyl tert-butyl ether (Liang et al 2010), polycyclic aromatic aromatic hydrocarbons (Wang et al 2008), phenols (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Chemical oxidation of N,N-diethyl-m-toluamide by sulfate radical-based oxidation: kinetics and mechanism of degradation

Tay

Rahman

Abas

2012

Int. J. Environ. Sci. Technol.

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A study was undertaken in order to understand the kinetics and mechanism of the chemical oxidation of N,N-diethyl-m-toluamide, an insect repellent, by sulfate radical. In this experiment, sulfate radical was generated using peroxymonosulfate with iron(II) and cobalt(II) as activator. The second-order rate constant for the reaction of the sulfate radical with N,N-diethyl-m-toluamide was found to be (1.9 ± 0.1) 9 10 9 M -1 s -1 at pH 7 and a temperature of 25°C. Experiments for the chemical oxidation of N,N-diethyl-m-toluamide in river water and secondary wastewater revealed that the percentage of the removal of N,N-diethyl-m-toluamide was slightly influenced by the water matrices. However, the selected oxidation systems are not effective for the removal of N,N-diethyl-mtoluamide in seawater. Transformation by-products of N,N-diethyl-m-toluamide generated using peroxymonosulfate/iron(II) sulfate, peroxymonosulfate/iron(II) chloride, peroxymonosulfate/cobalt(II) sulfate and peroxymonosulfate/cobalt(II) chloride systems were identified. The results indicated that there are slight differences in the distributions of the transformation by-products detected depending on the activator. The common transformation by-products detected in all selected oxidation systems areMonohydroxylated N,N-diethyl-m-toluamide were detected only when the peroxymonosulfate/iron(II) system was applied. For the peroxymonosulfate/cobalt(II) systems, additional isomers of monohydroxylated N-ethyl-m-toluamide were detected. Peroxymonosulfate/cobalt(II) also transformed 2-(diethylamino)-1-m-tolylethanone into N-ethyl-N-(2-oxo-2-m-tolylethyl)acetamide and monohydroxylated 2-(ethyl(vinyl)amino)-1-m-tolylethanone as transformation by-products.

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Section: Degradation Of Deet Using Pms Activated By Iron (Ii) and Cobmentioning

confidence: 74%

“…available for the activation of PMS (Chan and Chu 2009). The influence of counteranions for the DEET removal was performed using nitrate, sulfate and chloride salts of Co 2?…”

Section: Degradation Of Deet Using Pms Activated By Iron (Ii) and Cobmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chemical oxidation of N,N-diethyl-m-toluamide by sulfate radical-based oxidation: kinetics and mechanism of degradation

Tay

Rahman

Abas

2012

Int. J. Environ. Sci. Technol.

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“…− radicals were very effective in oxidizing and transforming organic compounds like atrazine (Chan & Chu, 2009). …”

Section: Advanced Oxidation Processesmentioning

confidence: 99%

Micropollutant Degradation Mechanism

Tepuš¹,

Petrinić²,

Simonič³

2011

Pesticides - Formulations, Effects, Fate

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“…Generation of sulfate radicals in the presence of a transition metal in a heterogeneous model can be reinforced and accelerated and also can be assumed as AOP [11]. Among the transition metals, Co 2+ can be a good candidate for sulfate radical to accelerate the AOP [12,13]. On the other hand, we can support Co 2+ on a heterogeneous surface like silica, titania, carbonaceous materials, etc.…”

Section: Introductionmentioning

confidence: 99%

Silica-Supported Co3O4 Nanoparticles as a Recyclable Catalyst for Rapid Degradation of Azodye

Baghban

Doustkhah

Rostamnia

et al. 2016

Bull. Chem. React. Eng. Catal.

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In this paper, silica nanoparticles with particle size of ~ 10-20 nm were selected as a support for the synthesis of Co3O4 nanoparticles by impregnation of silica nanoparticles in solution of Co(II) in a specific concentrations and then calcination to 800 o C. This nanocomposite was then, used as a catalyst for oxidative degradation of methyl orange (MO) with ammonium persulfate in aqueous media. Effect of pH, temperature, contact time, amount of oxidant and catalyst were studied in the presence of manuscript. Scanning electron microscope (SEM), electron dispersive spectroscopy (EDS), FT-IR, and ICP-AES analyses were used for analysis of silica-supported Co3O4 (Co3O4/SiO2). Treating MO with ammonium persulfate in the presence of Co3O4/SiO2 led to complete degradation of MO under the optimized conditions. Also, the catalyst exhibited recyclability at least over 10 consecutive runs.

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Degradation of atrazine by cobalt-mediated activation of peroxymonosulfate: Different cobalt counteranions in homogenous process and cobalt oxide catalysts in photolytic heterogeneous process

Cited by 421 publications

References 42 publications

Chemical oxidation of N,N-diethyl-m-toluamide by sulfate radical-based oxidation: kinetics and mechanism of degradation

Chemical oxidation of N,N-diethyl-m-toluamide by sulfate radical-based oxidation: kinetics and mechanism of degradation

Micropollutant Degradation Mechanism

Silica-Supported Co3O4 Nanoparticles as a Recyclable Catalyst for Rapid Degradation of Azodye

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