Analysis of experimental data on divalent cation diffusion kinetics in aluminosilicate garnets with application to timescales of peak Barrovian metamorphism, Scotland

2015 ◽  
Vol 170 (2) ◽  
Author(s):  
Xu Chu ◽  
Jay J. Ague
Keyword(s):  
Experimental Data ◽  
Divalent Cation ◽  
Diffusion Kinetics ◽  
Cation Diffusion

scholarly journals Divalent cation diffusion in calcium fluorapatite

2011 ◽  
Vol 46 (23) ◽  
pp. 7459-7465 ◽  
Author(s):  
Eleanor E. Jay ◽  
Phillip M. Mallinson ◽  
Shirley K. Fong ◽  
Brian L. Metcalfe ◽  
Robin W. Grimes
Keyword(s):  
Divalent Cation ◽  
Cation Diffusion

Monovalent versus Divalent Cation Diffusion in Thiospinel Ti2S4

2017 ◽  
Vol 8 (10) ◽  
pp. 2253-2257 ◽  
Author(s):  
Patrick Bonnick ◽  
Xiaoqi Sun ◽  
Ka-Cheong Lau ◽  
Chen Liao ◽  
Linda F. Nazar
Keyword(s):  
Divalent Cation ◽  
Cation Diffusion

scholarly journals Contribution to the Study of Phosphorus Adsorption Kinetics on the Superficial Sediments of a Recently Development Artificial Estuary: Vridi Channel (Côte d'Ivoire)

2021 ◽  
pp. 1-22
Author(s):  
N’da Samuel ◽  
Yao Marcel Konan ◽  
Trokourey Albert
Keyword(s):  
Experimental Data ◽  
Adsorption Kinetics ◽  
Molecular Diffusion ◽  
Cold Season ◽  
Kinetics Model ◽  
Diffusion Kinetics ◽  
Phosphorus Adsorption ◽  
External Diffusion ◽  
Us Epa ◽  
Superficial Sediments

The aim of this study is to characterize phosphates adsorption kinetics on the superficial sediments of Vridi channel from its new hydromorphology. So, three scenarios have been carried out taking account the different waters seasons of this estuary by using pH and temperature as relevant parameters. In the first scenario, the experiments carried out at pH = 8 and T = 20°C to simulate phosphates adsorption on these sediments in its great cold season. In the second, the experiments carried out at pH = 8 and T = 25° C to simulate phosphates adsorption on these substrates in its hot season and small cold season. In the third, the experiments carried out at pH = 7 and T = 30°C to simulate phosphates adsorption on these sediments in its flood season. The experiences were carried out according to US EPA/530/SW-87/006-F protocol. KH2PO4 solutions were used as phosphates synthetic solutions. The experimental data were modeling by Lagergeen kinetics model (pseudo-order 1), Blanchard kinetics model (pseudo-order 2), Elovich kinetics model, Weber and Morris kinetics model and, external diffusion kinetics model. The results have showed phosphates adsorption on these sediments increase in the experiments carried out at pH = 8 and T = 20°C to those carried out at pH = 7 and T = 30°C. All experimental data have been well modeling by Blanchard kinetics model. So, these phosphates adsorption kinetics are pseudo-order 2 and the chemisorption is the dominant mechanism. The results obtained by the experimental data modeling by Weber and Morris kinetics model and external diffusion kinetics model showed that this process is not limiting by the molecular diffusion process. The experimental data have been again well modeling by Elovich kinetics model. That has confirmed the chemisorption character of this adsorption, and showed this chemisorption is activated.

scholarly journals Diffusion Kinetics Analysis of Cation Diffusion in YSZ and LSGM

2008 ◽  
Vol 273-276 ◽  
pp. 445-454
Author(s):  
Irina V. Belova ◽  
Graeme E. Murch ◽  
D. Samuelis ◽  
Manfred Martin
Keyword(s):  
Monte Carlo ◽  
Cation Vacancy ◽  
Tracer Diffusion ◽  
Diffusion Kinetics ◽  
Kinetics Analysis ◽  
Cation Diffusion ◽  
Wide Range ◽  
Cluster Mechanism ◽  
Diffusion Mechanisms ◽  
Phenomenological Coefficients

In this paper, we discuss different possible cation diffusion mechanisms in YSZ and LSGM. Monte Carlo simulations are also reported of tracer diffusivities in LSGM for a postulated cluster mechanism. These simulations extend earlier simulations on un-doped material. The limits of the ratio of the diffusivities are consistent with experimental tracer diffusion findings over a wide range of cation-vacancy exchange frequencies. We also develop relationships between the phenomenological coefficients and use these relationships to predict possible demixing and interdiffusion experimental outcomes.

Role of Reverse Divalent Cation Diffusion in Forward Osmosis Biofouling

2015 ◽  
Vol 49 (22) ◽  
pp. 13222-13229 ◽  
Author(s):  
Ming Xie ◽  
Edo Bar-Zeev ◽  
Sara M. Hashmi ◽  
Long D. Nghiem ◽  
Menachem Elimelech
Keyword(s):  
Divalent Cation ◽  
Forward Osmosis ◽  
Cation Diffusion
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