Surface reactivity of hydroxyl radicals formed upon catalytic decomposition of H2O2 on ZrO2

Yang, Miao; Jönsson, Mats

doi:10.1016/j.molcata.2015.02.002

Cited by 18 publications

(25 citation statements)

References 33 publications

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“…In a previous paper, the tris concentration dependence on the formaldehyde production rate in a system where H 2 O 2 was catalytically decomposed on ZrO 2 was studied. [22] Interestingly, the concentration dependence paralleled the trend seen for TiO 2 -photocatalysis (the rate of formaldehyde formation becomes independent of tris-concentration above 100 mM) [23] indicating that the affinity of tris towards ZrO 2 is similar to the affinity towards TiO 2 . The difference in the amount of scavenged hydroxyl radicals between the tris and coumarin experiments in the present work is around a factor of 300 in favour of tris.…”

Section: Confirming the Formation Of Hydroxyl Radicals In The Catalytmentioning

confidence: 59%

Confirming the Formation of Hydroxyl Radicals in the Catalytic Decomposition of H₂O₂ on Metal Oxides Using Coumarin as a Probe

2019

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Hydrogen peroxide can be catalytically decomposed to O2 and H2O on metal oxide surfaces in contact with aqueous solutions containing H2O2. The initial step in this process has been proposed to be the formation of surface‐bound hydroxyl radicals which has recently been verified using tris as a radical scavenger. Here, we make use of the unique fluorescent product 7‐hydroxycoumarin formed in the reaction between hydroxyl radicals and coumarin to probe the formation of surface‐bound hydroxyl radicals. The experiments clearly show that 7‐hydroxycoumarin is formed upon catalytic decomposition of H2O2 in aqueous suspensions containing ZrO2‐particles and coumarin, thereby confirming the formation of surface‐bound hydroxyl radicals in this process. The results are quantitatively compared to results on the same system using tris as a probe for hydroxyl radicals. The effects of the two probes on the system under study are compared and it is concluded that coumarin has a significantly lower impact on the system.

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Section: Confirming the Formation Of Hydroxyl Radicals In The Catalytmentioning

confidence: 59%

Confirming the Formation of Hydroxyl Radicals in the Catalytic Decomposition of H₂O₂ on Metal Oxides Using Coumarin as a Probe

2019

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“…The other experimental conditions in the present study are in line with previous works. 43,44 The concentrations of H 2 O 2 and CH 2 O as a function of reaction time in the presence of different amounts of tungsten powder are shown in Figure 2.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Kinetics and Mechanism of the Reaction between H₂O₂ and Tungsten Powder in Water

et al. 2015

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In this work, the reaction between H 2 O 2 and tungsten powder in the presence of Tris(hydroxymethyl) aminomethane was studied experimentally. The production of hydroxyl radicals can be quantified indirectly by quantifying the scavenging product formaldehyde (CH 2 O). XRD, XPS, and SEM analysis shows that no significant structural or compositional changes occur after reaction. We compared H 2 O 2 consumption and CH 2 O formation in both heterogeneous W (s) /H 2 O 2 /Tris system and homogeneous W (aq) /H 2 O 2 /Tris system. Increasing the amount of W powder leads to the increase in dissolution rate of W species, insignificant increase of H 2 O 2 consumption rate and the decrease of final CH 2 O production. By contrast, the consumption rate of H 2 O 2 increases as increasing the concentration of dissolved W species. Based on the experimental results, a mechanism of H 2 O 2 reacting with W powder in the presence of Tris is proposed. The mechanism well explained the relationship between surface reactions and homogeneous Haber−Weiss peroxide chain breakdown.

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“…Thus, in this work the CDots/g-C 3 N 4 composite was fabricated with a fixed fraction of CDots (1.26 wt.%) selected by preliminary experiments. It is known that the surface reaction is dominating in the present heterogeneous system, therefore surface area to solution volume ratio (SA/V) is used to represent the dosage of the composites other than the mass concentration, which has been applied in many reported works [17,18,22,27,28,[54][55][56]. The SA/V value is obtained by combining the mass concentration (g/L) with specific surface area (m 2 /g) and can be normalized to m −1 .…”

Section: Kinetic Studymentioning

confidence: 99%

Kinetic and Mechanistic Study on Catalytic Decomposition of Hydrogen Peroxide on Carbon-Nanodots/Graphitic Carbon Nitride Composite

et al. 2018

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The metal-free CDots/g-C3N4 composite, normally used as the photocatalyst in H2 generation and organic degradation, can also be applied as an environmental catalyst by in-situ production of strong oxidant hydroxyl radical (HO·) via catalytic decomposition of hydrogen peroxide (H2O2) without light irradiation. In this work, CDots/g-C3N4 composite was synthesized via an electrochemical method preparing CDots followed by the thermal polymerization of urea. Transmission electron microscopy (TEM), X-Ray diffraction (XRD), Fourier Transform Infrared (FTIR), N2 adsorption/desorption isotherm and pore width distribution were carried out for characterization. The intrinsic catalytic performance, including kinetics and thermodynamic, was studied in terms of catalytic decomposition of H2O2 without light irradiation. The second-order rate constant of the reaction was calculated to be (1.42 ± 0.07) × 10−9 m·s−1 and the activation energy was calculated to be (29.05 ± 0.80) kJ·mol−1. Tris(hydroxymethyl) aminomethane (Tris) was selected to probe the produced HO· during the decomposing of H2O2 as well as to buffer the pH of the solution. The composite was shown to be base-catalyzed and the optimal performance was achieved at pH 8.0. A detailed mechanism involving the adsorb-catalyze double reaction site was proposed. Overall, CDots/g-C3N4 composite can be further applied in advanced oxidation technology in the presence of H2O2 and the instinct dynamics and the mechanism can be referred to further applications in related fields.

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Surface reactivity of hydroxyl radicals formed upon catalytic decomposition of H2O2 on ZrO2

Cited by 18 publications

References 33 publications

Confirming the Formation of Hydroxyl Radicals in the Catalytic Decomposition of H₂O₂ on Metal Oxides Using Coumarin as a Probe

Confirming the Formation of Hydroxyl Radicals in the Catalytic Decomposition of H₂O₂ on Metal Oxides Using Coumarin as a Probe

Kinetics and Mechanism of the Reaction between H₂O₂ and Tungsten Powder in Water

Kinetic and Mechanistic Study on Catalytic Decomposition of Hydrogen Peroxide on Carbon-Nanodots/Graphitic Carbon Nitride Composite

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Surface reactivity of hydroxyl radicals formed upon catalytic decomposition of H2O2 on ZrO2

Cited by 18 publications

References 33 publications

Confirming the Formation of Hydroxyl Radicals in the Catalytic Decomposition of H2O2 on Metal Oxides Using Coumarin as a Probe

Confirming the Formation of Hydroxyl Radicals in the Catalytic Decomposition of H2O2 on Metal Oxides Using Coumarin as a Probe

Kinetics and Mechanism of the Reaction between H2O2 and Tungsten Powder in Water

Kinetic and Mechanistic Study on Catalytic Decomposition of Hydrogen Peroxide on Carbon-Nanodots/Graphitic Carbon Nitride Composite

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Confirming the Formation of Hydroxyl Radicals in the Catalytic Decomposition of H₂O₂ on Metal Oxides Using Coumarin as a Probe

Confirming the Formation of Hydroxyl Radicals in the Catalytic Decomposition of H₂O₂ on Metal Oxides Using Coumarin as a Probe

Kinetics and Mechanism of the Reaction between H₂O₂ and Tungsten Powder in Water