2006
DOI: 10.1016/j.electacta.2005.12.010
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EC(EE) process in the reduction of the herbicide clopyralid on mercury electrodes

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Cited by 32 publications
(25 citation statements)
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“…1 shows the cyclic voltammograms of picloram in the absence and in the presence of Triton X-100. In the absence of the surfactant, and at concentrations higher than 2 · 10 À4 m, two prepeak systems were found in the voltammogram: in the potential range À 0.6 to À 0.8 V, close to the main reductions peak (in the following, peak 1), appears a system named system I, and in the potential range 0 to À 0.4 V, which is far from both peak 1 and system I, appears a system named system II [8]. Under these conditions, these prepeak systems can be attributed to the weak adsorption of reactant and the strong adsorption of the product at the electrode surface.…”
Section: Methodsmentioning
confidence: 97%
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“…1 shows the cyclic voltammograms of picloram in the absence and in the presence of Triton X-100. In the absence of the surfactant, and at concentrations higher than 2 · 10 À4 m, two prepeak systems were found in the voltammogram: in the potential range À 0.6 to À 0.8 V, close to the main reductions peak (in the following, peak 1), appears a system named system I, and in the potential range 0 to À 0.4 V, which is far from both peak 1 and system I, appears a system named system II [8]. Under these conditions, these prepeak systems can be attributed to the weak adsorption of reactant and the strong adsorption of the product at the electrode surface.…”
Section: Methodsmentioning
confidence: 97%
“…were purged with purified N 2 and the temp. was kept at 298 AE 0.1 K. All other experimental conditions are given in [8] [12].…”
Section: At Concentrations Higher Than 2 · 10mentioning
confidence: 99%
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“…Thus, the TiO 2 surface will be positively charged ( 2 TiOH  ) in acidic media (pH  pH pzc ) and negatively charged (TiO  ) in alkaline media (pH  pH pzc ). On the other hand, the pK a values for CLP are 1.4±0.1 and 4.4±0.1 (Corredor et al, 2006), so that at pH < 1.4 the herbicide is mainly present in its protonated form, and at pH > 4.4 in the anionic form. In the pH interval from 2.4 to 3.5, one can expect a great increase in the photodegradation rate, arising as a consequence of the dissociation of the carboxylic group and deprotonation of the pyridine nitrogen (to a significantly smaller extent).…”
Section: Effect Of the Initial Phmentioning
confidence: 99%
“…Namely, under the visible light, clopyralid is practically not degraded in the presence of any of the mentioned catalysts (Figure 6a), whereas under UV irradiation (Figure 6b) some degradation takes place, but at a rate which is by about three times lower than in the case of mecoprop. The photocatalytic degradation of mecoprop and clopyralid seems to be related to the difference in pK a values (for mecoprop pK a = 3.11-3.78 [20] and for clopyralid pK 1 = 1.4 and pK 2 = 4.4 [21]) [22] and to the difference in molecular structure of these compounds. The larger rate of clopyralid photodegradation under UV than under visible irradiation is in agreement with results of other authors [22], who explain it by the difference in the mechanism of the process.…”
Section: Photocatalytic Activitymentioning
confidence: 99%