Electrochemical behavior and electrowinning of palladium in nitric acid media

Liu, Shengchu; Wei, Yuezhou; Liu, Rui‐Qin; Fang, Baizeng

doi:10.1007/s11426-013-4945-2

Cited by 9 publications

(3 citation statements)

References 17 publications

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“…where R is the gas constant, T is the absolute temperature (K), F is the Faraday constant, α is the transfer charge coefficient, and c is a constant. Based on Equation ( 5), the α value for Pd reduction at pH 5 is 0.19, while at pH 8, it is 0.21, which compares favorably with values reported in the literature during the Pd electrodeposition onto Pt from nitric acid media [55].…”

Section: Voltamperometric Studysupporting

confidence: 83%

The Effect of pH on the Electrodeposition of Pd Clusters onto Highly Ordered Pyrolytic Graphite—A Kinetic and Morphological Study

Bravo-Rodriguez,

Mendoza-Huizar,

Rivera

et al. 2024

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In this study, we carried out an electrochemical investigation of the palladium electrodeposition process at pH 5 and 8, evaluating the kinetic parameters related to its nucleation and growth processes on a Highly Oriented Pyrolytic Graphite (HOPG) electrode from a plating bath containing 1 mM of Pd and 1 M NH4Cl. The voltammetric study allowed us to identify the potential values at which palladium can be electrodeposited, along with the adsorption and desorption processes of hydrogen absorbed on the deposited Pd. Analysis of the peak currents of the deposited Pd indicated diffusional control at both pH values. The evaluation of kinetic parameters, such as the number of active nucleation sites (N0), the nucleation rate (A), and the rate constant of the proton reduction process (kPR), was determined via potentiostatic studies, revealing their dependence on the applied potential to the electrode. The number of active nucleation sites predicted by the nucleation model correlated well with the number of nuclei observed via Scanning Electron Microscopy (SEM). SEM images revealed that at pH 5, the Pd clusters had an average diameter of 27 nm and a height of 39 nm, while at pH 8, the clusters had an average diameter of 12.8 nm and a height of 16.6 nm. At pH 5, homogeneous and dispersed Pd clusters were obtained, while at pH 8, agglomeration of Pd clusters was observed.

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Section: Voltamperometric Studysupporting

confidence: 83%

The Effect of pH on the Electrodeposition of Pd Clusters onto Highly Ordered Pyrolytic Graphite—A Kinetic and Morphological Study

Bravo-Rodriguez,

Mendoza-Huizar,

Rivera

et al. 2024

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“…Employing cyclic voltammetry, after point-by-point background subtraction, the plot of peak current (Ip) vs. the square root of scan rate (υ 1/2 ) showed a linear relationship. According to the Randles-Sevcik equation, the diffusion coefficient of cilnidipine could then be estimated from the slope of the plot of peak current (Ip) vs. the square root of scan rate ( 1/2 ), given by the Randles-Sevcik equation [26][27][28] .…”

Section: Determination Of Diffusion Coefficient (D O CM 2 /S)mentioning

confidence: 99%

Electrochemical Determination of Cardiovascular Drug Cilnidipine at Glassy Carbon Electrode in Pharmaceutical Formulations

2019

Chem Sci Trans

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Electrochemical behaviour of cilnidipine at glassy carbon electrode was investigated using cyclic, square wave cathodic adsorptive stripping (SW-CAdS) and differential pulse cathodic adsorptive stripping (DP-CAdS) voltammetry under different experimental conditions. The voltammetric peak current and potential for the reduction of cilnidipine were analysed at different pH, scan rate and concentration. The voltammograms exhibited irreversible reduction of cilnidipine in B R buffer of pH 5.5. Cilnidipine gave one well-defined reduction peak at-0.821 potential versus Ag/AgCl reference electrode in BR buffer of pH 5.5. Reduction process was irreversible and diffusion controlled. Diffusion coefficients (7.45x10-4 cm 2 /s and 6.45x10-4 cm 2 /s), surface coverage (4.23x10-3 mol/cm 2 and 98.01x10-3 mol/cm 2) and heterogeneous rate constant (1.25x10 2 s-1) were calculated at bare GCE respectively. Based on CV, CPC and pH studies a reduction mechanism was proposed involving 6H + /6e-. The proposed square wave voltammetric method shows linearity over the concentration range (4.21x10-6-9.71x10-3 M) The achieved limits of detection (LOD) and quantification (LOQ) are 5.44x10-8 g/mL and 1.52x10-7 g/mL respectively.

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“…In order to remove the heavy metal and radioactive metal pollution, many processes like adsorption (Aslani et al, 1998;Kilincarslan and Akyil, 2005), precipitation (Bhanushali et al, 1999), coagulation (Tresintsi et al, 2013), ion exchange (Akyil et al, 1996(Akyil et al, , 2003, cementation (Sun et al, 2014), electro-dialysis (Inoue et al, 2004), electro-winning (Liu et al, 2013), electro-coagulation (Verma et al, 2013), and reverse osmosis (Khedr, 2013) have been developed. Of these, the adsorption is one of the most effective methods used in the purification of heavy metal and radioactive metals from contaminated wastewaters.…”

Section: Introductionmentioning

confidence: 99%

Assessment of reaction between thorium and polyelectrolyte nano-thin film using Box–Behnken design

Aslani

Celik

Mermer

et al. 2017

Adsorption Science & Technology

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Sandwich type polyelectrolyte nano-thin films (PENTFs) were prepared by using polyallylamine hydrochloride and polyacrylic acid from layer-by-layer assembly process with spin coating system. Their nanostructures have been studied by scanning electron microscope, atomic force microscope, and attenuated total reflectance Fourier transform infrared spectroscopy. In order to understand the effects of the initial concentration of thorium, initial solution pH, temperature, and contact time on the reaction between thorium and PENTF, an experiment data set was designed according to Box-Behnken model. The analysis of variance calculations for regression model were carried out in 95% confidence level and were checked for fitting experimental data and predicted values. The correlation coefficient value (R 2) obtained as 94% showed that there was a correlation between the predicted and the observed values. The optimum pH, temperature, initial concentration of thorium, and interaction time in studied ranges were found as 2.81, 35 C, 160 mgÁL À1 , and 120 min, respectively. At these conditions thorium (IV) ions adsorption yield was obtained as 89 AE 2%. The Freundlich, Langmuir, and Dubinin-Radushkevich isotherms were used to investigate the characteristics of the process. These characteristics data imply that the Freundlich model fits better than the Langmuir model for the Th (IV) sorption onto PENTFs with K F and n values were found to be 20.6 mgÁg À1 and 1.08 LÁmg À1 , respectively. The thermodynamic parameters were also computed as negative ÁH value suggest that adsorption of Th (IV) is exothermic nature. The calculated negative and positive values of ÁG indicate that the sorption process is favorable (energetically) while running below 40 C and over this point the process status change to non-spontaneous, respectively.

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Electrochemical behavior and electrowinning of palladium in nitric acid media

Cited by 9 publications

References 17 publications

The Effect of pH on the Electrodeposition of Pd Clusters onto Highly Ordered Pyrolytic Graphite—A Kinetic and Morphological Study

The Effect of pH on the Electrodeposition of Pd Clusters onto Highly Ordered Pyrolytic Graphite—A Kinetic and Morphological Study

Electrochemical Determination of Cardiovascular Drug Cilnidipine at Glassy Carbon Electrode in Pharmaceutical Formulations

Assessment of reaction between thorium and polyelectrolyte nano-thin film using Box–Behnken design

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