Briggs-Rauscher reaction as a novel electrochemical detector for phosphate tungsten and phosphate molybdenum bronzes

Pagnacco, Maja C.; Maksimović, Jelena P.; Mudrinić, Tihana; Mojović, Zorica; Nedić, Zoran

doi:10.1016/j.jelechem.2019.113369

Cited by 6 publications

(9 citation statements)

References 30 publications

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“…6. In all cases the linear correlation has been obtained: The first two linear correlations can be used as calibration curve determining the unknown mass of bronzes and have been previously published [17,18]. Namely, comparing cation-free, PWB, Li + , and Ca 2+ doped PWB behavior (all in heterogeneous conditions) in BR chemical system, it can be concluded that PWB shows the highest slope of τ osc versus mass (Fig.…”

Section: Comparison Of Undoped Pwb Li-pwb and Ca-pwb Effects On Oscillatory Br Reaction Dynamicsmentioning

confidence: 96%

“…The reaction volume was 25.0 ± 0.1 ml. The initial concentrations of the reactants in the system were: [CH 2 (COOH) 2 ] 0 = 0.0789 mol dm -3 The experimental equipment and procedure were the same as described in reference [17], where the method for solid insoluble sample is established for the first time. After reaching of the desired temperature (37.0 o C) and stabilization of the potential of Pt working electrode, appropriated masses of calcium doped phosphate tungsten bronze (0.0138 g ± 0.0001 g; 0.0179 g ± 0.0001 g; 0.0268 g ± 0.0001 g; 0.0308 g ± 0.0001 g; 0.0558 g ± 0.0001 g; 0.0737 g ± 0.0001 g; 0.0956 g ± 0.0001 g; 0.1110 ± 0.0001 g), have been appended into the reaction system.…”

Section: Briggs-rauscher Reaction -Experimental Setupmentioning

confidence: 99%

“…Namely, it was shown that the conducting phases in tungsten-titaniumphosphate glass-ceramics system have been identified as phosphate tungsten bronzes, rather than tungsten suboxides. In general, PWB metallic properties and the high oxidation state of tungsten, make this material as a promising catalyst in the Briggs-Rauscher (abbreviated as BR) oscillatory reaction [17,18]. The BR reaction is one of the most interesting oscillatory reaction where the oxidation of malonic acid [CH 2 (COOH) 2 ], in the presence of hydrogen peroxide (H 2 O 2 ) and potassium iodate (KIO 3 ), is catalyzed by manganese ions (Mn 2+ ) in acidic medium [19]:…”

Section: Introductionmentioning

confidence: 99%

“…Our recent investigation shows that the BR reaction could be used for distinction of different types of bronzes (e.g. phosphate tungsten and phosphate molybdenum) based on their different catalytic activity [17].…”

Section: Introductionmentioning

confidence: 99%

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A possible connection between phosphate tungsten bronzes properties and Briggs-Rauscher oscillatory reaction response

Maksimović

Tančić³

et al. 2021

Sci Sintering

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The calcium phosphate tungsten bronze (Ca-PWB) has been synthesized and characterized (TGA, DSC, XRPD, FTIR, SEM). The influence of solid insoluble materials Ca- PWB, as well as lithium doped (Li-PWB) and cation free phosphate tungsten (PWB) bronzes on the oscillatory Briggs-Rauscher (BR) reaction dynamics, is compared. The results show that doping with Li and Ca reduces sensitivity of the BR reaction towards bronzes addition. These findings suggest the usage of the BR reaction as an innovative method for testing of different properties of bronze material. The behavior of PWB in the BR reaction is significantly changed with divalent cation (Ca2+) doping. The reasons for the different bronzes behavior were found in their calculated unit cell volumes. Namely, the compressed Ca-PWB unit cell volume indicates the difficult availability of the active site for heterogeneous catalysis. Hence, the linear correlation (slope) of the BR oscillogram?s length (?osc) vs. mass of bronze in BR reaction might be considered as a new parameter for the evaluation of the bronzes catalytic activity.

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Section: Comparison Of Undoped Pwb Li-pwb and Ca-pwb Effects On Oscillatory Br Reaction Dynamicsmentioning

confidence: 96%

Section: Briggs-rauscher Reaction -Experimental Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A possible connection between phosphate tungsten bronzes properties and Briggs-Rauscher oscillatory reaction response

Maksimović

Tančić³

et al. 2021

Sci Sintering

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“…Recently, our research group has successfully applied BR reaction as qualitative technique for distinguishing phosphate tungsten from phosphate molybdenum bronzes. [5] Therefore, in this work, a new methodology based on BR was tested on bentonite clays. Bentonite clays are reached in smectite minerals (for example montmorillonite and beidellite).…”

mentioning

confidence: 99%

Oscillatory Briggs‐Rauscher Reaction as “Fingerprint” for Bentonite Identification: The Fine‐Tuning of Oscillatory Dynamics with Addition of Clay

et al. 2020

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The oscillatory Briggs‐Rauscher (BR) reaction was applied on solid insoluble materials i. e. bentonite clays. Under the same BR experimental conditions, the addition of identical masses of bentonite of different origin resulted in different effects on oscillatory time duration (τ): no influence, quenching, or prolongation. It was found that the following bentonite properties: montmorillonite/beidellite ratio; cation exchange capacity; principal exchange cation; extent of iron leaching in acidic environment of BR reaction; and specific surface area of clay were not exclusively responsible for observed behavior. On the other hand, the influence of added mass, for all investigated clays, resulted in the same behavior pattern. The increase of the mass of added clay increased τ up to the certain maximal value (τmax, mmax) characteristic for each clay. Further increase of mass resulted in quenching. Therefore, (τmax, mmax) pair can be regarded as the “fingerprint” characteristic of bentonite useful for identification of its origin. Furthermore, the addition of naturally occurring and non‐toxic clay in an oscillatory reaction can offer a versatile approach to tune the oscillation dynamics of nonlinear chemical systems.

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Oscillatory chemical reaction as a sensor of Cu(II)–EDTA complex formation and ligand degradation in copper ion‐catalyzed oxidation of thiocyanate ions with hydrogen peroxide

Oliwa

Orlik

2021

Int J of Chemical Kinetics

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The complex dynamics of the homogeneous H2O2–NaSCN–CuSO4–NaOH oscillator is influenced by the addition of EDTA, which manifests itself in the modification or complete suppression of the oscillations. However, depending on EDTA concentration, this effect can be reversible or not. Potentiometric and spectroscopic studies of these phenomena, together with recent discoveries about possible chemical interactions and compound formation in the Cu(II)–H2O2–EDTA system, resulted in the development of a new kinetic mechanism of the complex interaction of EDTA with this oscillatory system. The model involves 13 intermediates and is an extension of our former, 10‐variable mechanism of the H2O2–NaSCN–CuSO4–NaOH oscillator. Reliability of the proposed reaction scheme has been confirmed by numerical calculations, enabling also the estimation of appropriate reaction rate constants. The work is an example of the application of the chemical oscillatory reaction to study qualitatively and quantitatively the interactions of foreign species with the components of positive and negative feedback loops of a chemical dynamical system.

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Briggs-Rauscher reaction as a novel electrochemical detector for phosphate tungsten and phosphate molybdenum bronzes

Cited by 6 publications

References 30 publications

A possible connection between phosphate tungsten bronzes properties and Briggs-Rauscher oscillatory reaction response

A possible connection between phosphate tungsten bronzes properties and Briggs-Rauscher oscillatory reaction response

Oscillatory Briggs‐Rauscher Reaction as “Fingerprint” for Bentonite Identification: The Fine‐Tuning of Oscillatory Dynamics with Addition of Clay

Oscillatory chemical reaction as a sensor of Cu(II)–EDTA complex formation and ligand degradation in copper ion‐catalyzed oxidation of thiocyanate ions with hydrogen peroxide

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