Parallel transport by surface and pore diffusion in a porous membrane

Yoshida, Hiroyuki; Maekawa, Masako; Nango, Mamoru

doi:10.1016/0009-2509(91)80004-i

Cited by 38 publications

(27 citation statements)

References 14 publications

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“…They also studied an intraparticle mass transfer in a bidispersed porous ion exchanger by mutual ion exchange . To prove a parallel transport of surface and pore diffusions, extensive studies on the mass transport of various direct dyes through porous cellulose membranes were previously conducted (Gutsche and Yoshida, 1994;Maekawa et al, 1989;Nango et al, 1989;Yoshida et al, 1986Yoshida et al, , 1989Yoshida et al, , 1991. They measured not only uptake curves but also concentration profiles and theoretically proved the existence of a parallel transport by using the experimental uptake curves and concentration profiles.…”

Section: Introductionmentioning

confidence: 98%

Intraparticle diffusion of phosphates in OH‐type strongly basic ion exchanger

Galinada

Yoshida

2004

AIChE Journal

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Section: Introductionmentioning

confidence: 98%

Intraparticle diffusion of phosphates in OH‐type strongly basic ion exchanger

Galinada

Yoshida

2004

AIChE Journal

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“…Therefore, dp approaches ~1 nm because of swelling of the microsphere by water. Using ts = 2 -5, 5 Ds is estimated to be (1 -3)¥ 10 -10 cm 2 s -1 , which is close to the surface-diffusion coefficient (~10 -10 cm 2 s -1 ) of a dye (a ~1 nm) in a water-swollen cellulose membrane (dp = 1.19 nm), 24 similar to the microscopic structure of chitin.…”

Section: Analytical Sciences May 2008 Vol 24mentioning

confidence: 76%

“…[22][23][24][25][26][27] Pore diffusion is the diffusion in a solution phase of pores, and surface diffusion is the diffusion along the surface of the pore walls. In this model, Do is given as follows for R » 1: 12 Fig.…”

Section: Pore and Surface Diffusion In Microspheresmentioning

confidence: 99%

Release Mechanism from a Microsphere of a Silkworm Chitin Derivative Studied by Single Microparticle Injection and Absorption Microspectroscopy

2008

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The release process of phenol blue from a dibutyrylchitin microsphere, prepared with chitin from a silkworm, into an aqueous solution was kinetically analyzed by single microparticle injection/manipulation and absorption microspectroscopy. The distribution ratio and the release rate of phenol blue in the single microsphere/water system were significantly influenced by the pH of the solution. These results are discussed in terms of the protonation of phenol blue and dibutyrylchitin, and the pore and surface diffusion in the pores of the microsphere.

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“…Following the equilibrium content of sulfur, the sorption rate in the present work is simulated. According to the theory 22,23) for the adsorption rate of porous materials, diffusion of sulfur in porous reduced iron can proceed by means of the gas phase diffusion of H 2 S molecule through pores and the surface diffusion of atomic sulfur adsorbed on pore surface. As a precondition for the diffusion model, it was assumed that local equilibrium of adsorption reaction, Reaction (1), between in the gas phase and on the pore surface is established.…”

Section: Diffusion Modelmentioning

confidence: 99%

Sulfur Sorption Rate and Equilibrium Content of Reduced Iron in H2-H2S Mixtures

Iguchi

Itoh²

2004

ISIJ International

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Contents and rates of the sulfur sorption on the reduced iron from hematite and limonite were measured in the atmosphere of H 2 -H 2 S mixture of sulfur activity less than unity by combining the thermogravimetric method with the reaction interruption method. The sulfur content by the former was a half the content by the latter presumably owing to the sorbed sulfur exchanged with sorbed oxygen. In this study, the saturated content of sulfur, which is attained after enough long time, was estimated by the latter and the sorption rate was measured by the former. The equilibrium content was properly expressed by the Langmuir's isotherm. The simulation of the sorption rate by the parallel model, in which the diffusion of gas molecules in the pore and the diffusion of adsorbed species on the wall of the pore were taken into account, was tried. It was successful with the sulfur sorption of the reduced iron from limonite and the diffusion was mainly surface diffusion at 873 K, but it gradually shifted to the diffusion in pore with increasing temperature. But any trial was unsuccessful with that from the hematite. The reason may be attributed to, in the reduced iron from the hematite, the contribution of sulfur segregated on the grain boundary of reduced iron is significant relative to the total sorption content to the content of sulfur adsorbed on the surface pore.

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Parallel transport by surface and pore diffusion in a porous membrane

Cited by 38 publications

References 14 publications

Intraparticle diffusion of phosphates in OH‐type strongly basic ion exchanger

Intraparticle diffusion of phosphates in OH‐type strongly basic ion exchanger

Release Mechanism from a Microsphere of a Silkworm Chitin Derivative Studied by Single Microparticle Injection and Absorption Microspectroscopy

Sulfur Sorption Rate and Equilibrium Content of Reduced Iron in H2-H2S Mixtures

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