Ruthenium adsorption and diffusion on the GaN(0001) surface

López, César Ortega; Pérez, W.; Rodríguez, Marcela

doi:10.1016/j.apsusc.2008.10.072

Cited by 11 publications

(3 citation statements)

References 36 publications

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“…Separation procedures including volatilization, coprecipitation, solvent extraction, sorption, and chromatography can be used to isolate and preconcentrate Ru from multicomponent samples containing noble and base metals (Balcerzak, 2002;Hong and Grubbs, 2007;Lopez et al, 2009;Knight et al, 2010;Kokate and Kuchekar, 2010). Separation of Ru has also been achieved by coprecipitation, sequential distillation, precipitation, and adsorption onto inorganic materials (Gandon et al, 1993;Granados et al, 2004;Rathore et al, 2004;ElAbsy et al, 2005).…”

Section: Introductionmentioning

confidence: 96%

Removal of Ruthenium from Aqueous Solution by Clinoptilolite

Kabiri-Tadi

Faghihian

2011

Clays and clay miner.

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Ruthenium compounds are highly toxic and carcinogenic. In the present study, clinoptilolite was used in the removal of Ru species from aqueous solutions. Clinoptilolite is a good choice of sorbents because it is naturally abundant and therefore cheap. After the process where Ru was removed from the aqueous solution, the clinoptilolite was characterized by X-ray diffraction, X-ray fluorescence, thermogravimetric analysis, and Fourier-transform infrared spectroscopy techniques. The influence of pH, contact time, and temperature on the adsorption of Ru was investigated and the optimum conditions were found to be 2 h of contact time and pH = 2. Pseudo first-order, pseudo second-order, Elovich, and intra-particle diffusion models were used to analyze the adsorption-rate data. The pseudo second-order model was found to be the best kinetics model in terms of matching the experimental results obtained. Adsorption isotherms were constructed to assess the maximum adsorption capacity of clinoptilolite. The Langmuir model fitted the data reasonably well in terms of regression coefficients. Adsorption studies were also performed at different temperatures to calculate the thermodynamic parameters. The numerical value of DG 0 decreased with increasing temperature, indicating that adsorption is favored at higher temperatures. The positive values of DH 0 corresponded to the endothermic nature of the adsorption processes. The proposed method of removal is applicable at an industrial scale.

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Section: Introductionmentioning

confidence: 96%

Removal of Ruthenium from Aqueous Solution by Clinoptilolite

Kabiri-Tadi

Faghihian

2011

Clays and clay miner.

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“…The surface phase diagram of the GaN (0001)‐(2 × 2) surface was investigated using ab initio calculations, which indicated the stability of the (2 × 2) surface in a certain temperature range . Ruthenium adsorption and diffusion on the GaN (0001) surface were investigated by first‐principles calculation, which found that Ru‐H 3 and Ru‐T 4 are the most energetically favored structures and the diffusion barrier from the H 3 site to T 4 site is 0.612 eV . There are a lot of studies focusing on investigating the characteristics of GaN‐based materials for sensors.…”

Section: Introductionmentioning

confidence: 99%

“…[28] Ruthenium adsorption and diffusion on the GaN (0001) surface were investigated by first-principles calculation, which found that Ru-H 3 and Ru-T 4 are the most energetically favored structures and the diffusion barrier from the H 3 site to T 4 site is 0.612 eV. [29] There are a lot of studies focusing on investigating the characteristics of GaN-based materials for sensors. Li et al investigated the adsorption of O 2 on the GaN (0001) surface using DFT.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Gas Adsorption on Pd‐ and Pt‐Decorated GaN (0001) Surface: A First‐Principles Study

Wang

Zhang

et al. 2019

Physica Status Solidi (b)

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Herein, density functional theory (DFT) calculations are carried out to investigate the hydrogen gas adsorption on the Pd(Pt)‐decorated GaN (0001) surface. It is found that the diffusion barrier of Pd (Pt) on the GaN (0001) surface is 0.3996 (0.602) eV. Hydrogen molecule adsorbed on the Pt‐decorated GaN (0001) surface can dissociate into hydrogen atoms. The comparison of the density of states and Mulliken charge analysis of the hydrogen molecule adsorption on the Pd(Pt)‐decorated GaN (0001) surface are analyzed in detail. The Pt‐decorated GaN (0001) surface is found to have a high sensing ability for hydrogen molecules from the theoretical point of view.

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