Electrocatalytic oxidation of p-nitrophenol from aqueous solutions at Pb/PbO2 anodes

Quiróz, Marco A.; Reyna, Silvia; Martínez‐Huitle, Carlos A.; Ferro, Sergio; Battisti, Achille De

doi:10.1016/j.apcatb.2005.02.009

Cited by 127 publications

(57 citation statements)

References 36 publications

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“…The USEPA recommends restricting their concentration in natural waters to below 10 ng L -1 [30,31], as it takes a long time for NPs to break down in groundwater, as well as in deep soil. The destruction and mineralization of NPs in waste streams are now possible by utilizing advanced oxidation processes (AOPs), such as, Fenton [32], photocatalytic oxidation [33,34], sonochemical degradation [35] and electrochemical degradation [36][37][38][39][40], but satisfactory methods are still undeveloped and their degradation mechanism is not clear.…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic oxidation of nitrophenols in aqueous solution using modified PbO2 electrodes

Liu

Zhang

et al. 2007

J Appl Electrochem

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Various kinds of modified lead dioxide (PbO 2 ) electrodes, doped with bismuth oxides and cobalt oxides, were prepared by electrodeposition in acid solution, and were characterized in terms of their morphological (SEM) and structural (XRD) features. Mineralization experiments on o-nitrophenol (ONP) in an electrocatalytic oxidation system showed that the electrocatalytic activity of Ti/BiPbO 2 was superior to the traditional dimensionally stable anodes (DSAs) Ti/b-PbO 2 and other modified PbO 2 electrodes. The mineralization, reaction kinetics and nitrogroup transformation of nitrophenols (ONP, p-nitrophenol (PNP) and m-nitrophenol (MNP)) on Ti/Bi-PbO 2 electrodes were studied and compared. NPs were degraded completely under the present experimental conditions by applying a 30 mA cm -2 current density at pH 4.3 in 0.1 M Na 2 SO 4 and 0.01 M NaCl. The degradation of NPs lay in the order: ONP [ MNP [ PNP. A simple degradation mechanism model is proposed.

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Section: Introductionmentioning

confidence: 99%

Electrocatalytic oxidation of nitrophenols in aqueous solution using modified PbO2 electrodes

Liu

Zhang

et al. 2007

J Appl Electrochem

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“…1 We can find that, no matter how much the electrolysis voltage is, the peak at 270 nm decreases from 1 h to 12 h, which implies that phenol was degraded. 21 Detailed UV absorbance changes at 270 nm vs. time under different voltage are listed in Fig. 2.…”

Section: In Situ Uv-vis Scan Resultsmentioning

confidence: 99%

In Situ Cyclic Voltammogram and UV-vis Spectrum Monitoring of Phenol Oxidation on the Anode of Ti/Sb-SnO<sub>2</sub> under Different Electrolysis Potentials

et al. 2015

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The refractory organic pollutant (phenol) was electro-catalytic-oxidized on the Sb-doped SnO 2 anode prepared by coating pyrolysis method. The effect of electrolysis potential on phenol degradation has been studied. It is proved that the degradation rate has a parabola shape relationship with applied electrolysis potential, and 2 V is the most optimistic potential in our research. In situ cyclic voltammogram and Ultraviolet-visible spectrum were carried out to track the process of phenol oxidation and speculate the intermediate reaction process. All the results implied that phenol was oxidized through different pathways under different electrolysis potentials. The phenomena confirm the conclusion that when degradation voltage was 2 V, phenol was directly oxidized rather than through the process of benzoquinone intermediate, which happened under other potentials, and the direct oxidation pathway was more efficient. Based on experimental results and the previous reports by other researchers, reaction pathways proposed in our research are given.

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“…The contamination of pnp may induce blood disorders, kidney and liver damage, eye and skin irritation [22] and chronic poisoning [23]. As mentioned before, heterogeneous photocatalysis is found to be an effective process for complete mineralization [24] without any disadvantages such as complex design, special equipments and devices to be met with other advanced oxidation techniques [25]. Paola et al have reported photodegradation of pnp using TiO 2 (Degussa P25) [26].…”

Section: Introductionmentioning

confidence: 98%

Investigation of photocatalytic activity of pure strontium hydroxyapatite and its Ti-substituted and TiO2 loaded forms

Gangarajula

Kedharnath

Gopal

2015

Applied Catalysis A: General

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Electrocatalytic oxidation of p-nitrophenol from aqueous solutions at Pb/PbO2 anodes

Cited by 127 publications

References 36 publications

Electrocatalytic oxidation of nitrophenols in aqueous solution using modified PbO2 electrodes

Electrocatalytic oxidation of nitrophenols in aqueous solution using modified PbO2 electrodes

In Situ Cyclic Voltammogram and UV-vis Spectrum Monitoring of Phenol Oxidation on the Anode of Ti/Sb-SnO<sub>2</sub> under Different Electrolysis Potentials

Investigation of photocatalytic activity of pure strontium hydroxyapatite and its Ti-substituted and TiO2 loaded forms

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