Kinetic studies of sorption and reduction of gold(III) chloride complex ions on activated carbon Norit ROX 0.8

Socha

Fitzner

2017

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In this paper, results showing the possibility of activated carbon application in platinum recovery from aqueous solution are presented. The studies were performed with the commercially available activated carbon, and the results can be easily transferred directly to the industry. The influence of pH, mixing rate, and amount of activated carbon as well as platinum(IV) initial concentration on the rate of adsorption was investigated. It was shown that after adsorption platinum is present on the surface of activated carbon in two oxidation states, ?2 and ?4, where shares of those forms are equal to 47 and 53%. Moreover, the enthalpy and entropy of activation were determined and are equal to 16.14 ± 075 kJ mol -1 and 42.19 ± 0.28 J mol -1 K -1 .

Section: Influence Of Temperature On the Process Ratesupporting

confidence: 63%

“…Our previous studies were focused on the application of this method to gold [27,28] and platinum [29] recovery using different types of activated carbons. Those studies were focused on the recovery of precious metals from acidic, chloride ion containing aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Kinetic studies of the removal of Pt(IV) chloride complex ions from acidic aqueous solutions using activated carbon

Socha

Fitzner

2017

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“…The BET analysis as well as mercury porosimetry of the activated carbon (AC) were performed and the results were shown in the previous paper [11]. Primarily, AC ROX 0.8 was designed for gas purification.…”

Section: Methodsmentioning

confidence: 99%

Kinetic studies of the sorption process of Pd(II) chloride complex ions from diluted aqua solutions using commercially available activated carbon

2017

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The kinetics of Pd(II) chloride complex ion recovery from diluted aqueous solutions was investigated using commercially available activated carbon. For this purpose, several different parameters as the influence of temperature, mixing rate, amount of activated carbon applied as well as initial concentrations of Pd(II) chloride complex ions were analyzed. The obtained results showed that the rate of the process is controlled by the mass transfer from the solution to the surface of AC. Therefore, a significant impact of the mixing rate was observed. The activation energy of each step was determined and it is found to be 23.5 ± 1.3, 52.7 ± 5.5 and 22.8 ± 9.5 kJ/mol for adsorption, desorption and reaction of Pd(II) chloride complex transformation. It was shown that commercially available activated carbon, initially designed for gas purification, can be also used for metal ions removal during water purification as well as for precious metal recovery.

“…There are two main application areas. The first one, related to recycling of metals [1][2][3][4][5][6][7][8][9][10][11] and the second one, related to the environmental protection [12][13][14][15][16][17]. Our work refers to the first area mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Kinetic modeling of the adsorption process of Pd(II) complex ions onto activated carbon

Fitzner

2018

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In this work, the results of kinetic studies of Pd(II) chloride complex ion adsorption process on activated carbon are presented. The experiments were conducted for different temperatures, initial concentrations of Pd(II) complex ions as well as for different amount of activated carbon. These results confirmed that the mechanism of the adsorption process is complex and can be described by two step reaction model. A new form of the adsorption isotherm based on kinetic mechanism is suggested and can describe the observed process. Moreover, it was shown that for specific conditions, the proposed isotherm can be transformed into the Freundlich's isotherm. The activation energies of the subsequent stages of the studied process were determined and are equal to E 1 = -9 ± 9, E 2 = -6 ± 1.4 and E 3 = -85 ± 8.9 J mol -1 , respectively. It is also suggested that the observed positive Gibbs energy change during adsorption can be related only to the first step of this process which does not lead to the final product.