Model study on the aqueous-phase hydrodechlorination of clopyralid on noble metal catalysts

Teevs, Linda; Vorlop, Klaus‐Dieter; Prüße, Ulf

doi:10.1016/j.catcom.2011.07.023

“…Its hydrodechlorination led to the formation of less toxic pipecolinic acid. Pd and PdAu catalysts showed the highest catalytic activity, but Pt and PtAu catalysts were more selective to pipecolinic acid …”

Section: Au Nps For Water Purification By Catalytic Reactionmentioning

confidence: 99%

“…For example, Teevs et al . studied Au‐, Pd‐ and Pt‐based catalysts for the aqueous‐phase hydrodechlorination of clopyralid . Clopyralid is a herbicide widely used for controlling broadleaf weeds in lawns and many agricultural crops.…”

Section: Au Nps For Water Purification By Catalytic Reactionmentioning

confidence: 99%

Gold nanoparticles for cleaning contaminated water

Hu

¹

,

Pretzer

²

,

Velázquez

³

et al. 2013

J of Chemical Tech & Biotech

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Pollutants in the form of heavy metals, fertilizers, detergents, and pesticides have seriously reduced the supply of pure drinking water and usable water. Gold metal has intriguing potential to deal with the water pollution problem, as recent research on several fronts is advancing the concept of nanoscale gold as the basis for cost-effective nanotechnology-based water treatment. Nano-gold has special properties, such as enhanced catalytic activity, visible surface plasmon resonance color changes, and chemical stability, that make it more useful than other materials. This Perspective article highlights the current use of gold nanoparticles for the efficient removal and the selective and sensitive detection of a variety of pollutants in water. The challenges in further developing nano-gold to address water contamination are discussed, which should stimulate future research into improved removal and detection of undesirable chemical compounds.

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“…It is a synthetic plant growth hormone that has some structural characteristics similar to those of natural hormones called auxins but is more persistent than these in plant tissue. This popular auxin-mimic type herbicide binds to molecules that are normally used as receptors for natural growth hormones, interfering with the normal growth of the plant and leading to its death in a short period of time [ 12 , 13 , 14 ]. Clopyralid is one of the systemic pesticides frequently found in drinking water [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Stability of Fenclorim and Clopyralid

Almeida¹,

Pinheiro²,

Ferreira³

et al. 2021

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The present work reports an experimental thermodynamic study of two nitrogen heterocyclic organic compounds, fenclorim and clopyralid, that have been used as herbicides. The sublimation vapor pressures of fenclorim (4,6-dichloro-2-phenylpyrimidine) and of clopyralid (3,6-dichloro-2-pyridinecarboxylic acid) were measured, at different temperatures, using a Knudsen mass-loss effusion technique. The vapor pressures of both crystalline and liquid (including supercooled liquid) phases of fenclorim were also determined using a static method based on capacitance diaphragm manometers. The experimental results enabled accurate determination of the standard molar enthalpies, entropies and Gibbs energies of sublimation for both compounds and of vaporization for fenclorim, allowing a phase diagram representation of the (p,T) results, in the neighborhood of the triple point of this compound. The temperatures and molar enthalpies of fusion of the two compounds studied were determined using differential scanning calorimetry. The standard isobaric molar heat capacities of the two crystalline compounds were determined at 298.15 K, using drop calorimetry. The gas phase thermodynamic properties of the two compounds were estimated through ab initio calculations, at the G3(MP2)//B3LYP level, and their thermodynamic stability was evaluated in the gaseous and crystalline phases, considering the calculated values of the standard Gibbs energies of formation, at 298.15 K. All these data, together with other physical and chemical properties, will be useful to predict the mobility and environmental distribution of these two compounds.

show abstract

“…It is a synthetic plant growth hormone that has some structural characteristics similar to those of natural hormones called auxins but is more persistent than these in plant tissue. This popular auxinmimic type herbicide binds to molecules that are normally used as receptors for natural growth hormones, interfering with the normal growth of the plant and leading to its death in a short period of time [12][13][14]. Clopyralid is one of the systemic pesticides frequently found in drinking water [15].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Stability of Fenclorim and Clopyralid

Almeida¹,

Pinheiro²,

Ferreira³

et al. 2021

Preprint

1

0

View full text Add to dashboard Cite

The present work reports an experimental thermodynamic study of two nitrogen heterocyclic organic compounds, fenclorim and clopyralid, that have been used as herbicides. The sublimation vapor pressures of fenclorim (4,6-dichloro-2-phenylpyrimidine) and of clopyralid (3,6-dichloro-2-pyridinecarboxylic acid) were measured, at different temperatures, using a Knudsen mass-loss effusion technique. The vapor pressures of both crystalline and liquid (including supercooled liquid) phases of fenclorim were also determined using a static method based on capacitance diaphragm manometers. The experimental results enabled accurate determination of the standard molar enthalpies, entropies and Gibbs energies of sublimation for both compounds and of vaporization for fenclorim, allowing a phase diagram representation of the (p,T) results, in the neighborhood of the triple point of this compound. The temperatures and molar enthalpies of fusion of the two compounds studied were determined using differential scanning calorimetry. The standard isobaric molar heat capacities of the two crystalline compounds were determined at 298.15 K, using drop calorimetry. The gas phase thermodynamic properties of the two compounds were estimated through ab initio calculations, at the G3(MP2)//B3LYP level, and their thermodynamic stability was evaluated in the gaseous and crystalline phases, considering the calculated values of the standard Gibbs energies of formation, at 298.15 K.

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Model study on the aqueous-phase hydrodechlorination of clopyralid on noble metal catalysts

Cited by 16 publications

References 21 publications

Gold nanoparticles for cleaning contaminated water

Gold nanoparticles for cleaning contaminated water

Thermodynamic Stability of Fenclorim and Clopyralid

Thermodynamic Stability of Fenclorim and Clopyralid

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