Role of the oxidation state of cerium on the ceria surfaces for silicate adsorption

Jihoon Seo; Jinok Moon; Joo Hyun Kim; Kangchun Lee; Junha Hwang; Heesung Yoon; Dong Kee Yi; Ungyu Paik

doi:10.1016/j.apsusc.2016.06.193

Role of the oxidation state of cerium on the ceria surfaces for silicate adsorption

Jihoon Seo
, Jinok Moon
, Joo Hyun Kim
, Kangchun Lee
, Junha Hwang
, Heesung Yoon
, Dong Kee Yi
, Ungyu Paik

Research output: Contribution to journal › Article › peer-review

65 Scopus citations

Abstract

In this study, we have investigated the role of the Ce oxidation state (Ce ³⁺ /Ce ⁴⁺ ) on the CeO ₂ surfaces for silicate adsorption. In aqueous medium, the Ce ³⁺ sites lead to the formation of −OH groups at the CeO ₂ surface through H ₂ O dissociation. Silicate ions can adsorb onto the CeO ₂ surface through interaction with the −OH groups (−Ce−OH− + −Si−O ⁻ ↔ −Ce−O−Si− + OH ⁻ ). As the Ce ³⁺ concentration increased from 19.3 to 27.6%, the surface density of −OH group increased from 0.34 to 0.72 OH/nm ² . To evaluate the adsorption behaviors of silicate ions onto CeO ₂ NPs, we carried out an adsorption isothermal analysis, and the adsorption isotherm data followed the Freundlich model. The Freundlich constant for the relative adsorption capacity (K _F ) and adsorption intensity (1/n) indicated that CeO ₂ NPs with high Ce ³⁺ concentration show higher adsorption affinity with silicate ions. As a result, we have demonstrated that the Ce oxidation state (Ce ³⁺ /Ce ⁴⁺ ) on the CeO ₂ surface can have a significant influence on the silicate adsorption.

Original language	English
Pages (from-to)	311-315
Number of pages	5
Journal	Applied Surface Science
Volume	389
DOIs	https://doi.org/10.1016/j.apsusc.2016.06.193
State	Published - 15 Dec 2016

Keywords

Adsorption isotherm
Ceria
Oxidation state
Particle size
Silicate ions

Access to Document

10.1016/j.apsusc.2016.06.193

Cite this

@article{ec2fcad94af442cd81f591138eebf1dc,

title = "Role of the oxidation state of cerium on the ceria surfaces for silicate adsorption",

abstract = " In this study, we have investigated the role of the Ce oxidation state (Ce 3+ /Ce 4+ ) on the CeO 2 surfaces for silicate adsorption. In aqueous medium, the Ce 3+ sites lead to the formation of −OH groups at the CeO 2 surface through H 2 O dissociation. Silicate ions can adsorb onto the CeO 2 surface through interaction with the −OH groups (−Ce−OH− + −Si−O − ↔ −Ce−O−Si− + OH − ). As the Ce 3+ concentration increased from 19.3 to 27.6\%, the surface density of −OH group increased from 0.34 to 0.72 OH/nm 2 . To evaluate the adsorption behaviors of silicate ions onto CeO 2 NPs, we carried out an adsorption isothermal analysis, and the adsorption isotherm data followed the Freundlich model. The Freundlich constant for the relative adsorption capacity (K F ) and adsorption intensity (1/n) indicated that CeO 2 NPs with high Ce 3+ concentration show higher adsorption affinity with silicate ions. As a result, we have demonstrated that the Ce oxidation state (Ce 3+ /Ce 4+ ) on the CeO 2 surface can have a significant influence on the silicate adsorption.",

keywords = "Adsorption isotherm, Ceria, Oxidation state, Particle size, Silicate ions",

author = "Jihoon Seo and Jinok Moon and Kim, \{Joo Hyun\} and Kangchun Lee and Junha Hwang and Heesung Yoon and Yi, \{Dong Kee\} and Ungyu Paik",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

year = "2016",

month = dec,

day = "15",

doi = "10.1016/j.apsusc.2016.06.193",

language = "English",

volume = "389",

pages = "311--315",

journal = "Applied Surface Science",

issn = "0169-4332",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Role of the oxidation state of cerium on the ceria surfaces for silicate adsorption

AU - Seo, Jihoon

AU - Moon, Jinok

AU - Kim, Joo Hyun

AU - Lee, Kangchun

AU - Hwang, Junha

AU - Yoon, Heesung

AU - Yi, Dong Kee

AU - Paik, Ungyu

PY - 2016/12/15

Y1 - 2016/12/15

N2 - In this study, we have investigated the role of the Ce oxidation state (Ce 3+ /Ce 4+ ) on the CeO 2 surfaces for silicate adsorption. In aqueous medium, the Ce 3+ sites lead to the formation of −OH groups at the CeO 2 surface through H 2 O dissociation. Silicate ions can adsorb onto the CeO 2 surface through interaction with the −OH groups (−Ce−OH− + −Si−O − ↔ −Ce−O−Si− + OH − ). As the Ce 3+ concentration increased from 19.3 to 27.6%, the surface density of −OH group increased from 0.34 to 0.72 OH/nm 2 . To evaluate the adsorption behaviors of silicate ions onto CeO 2 NPs, we carried out an adsorption isothermal analysis, and the adsorption isotherm data followed the Freundlich model. The Freundlich constant for the relative adsorption capacity (K F ) and adsorption intensity (1/n) indicated that CeO 2 NPs with high Ce 3+ concentration show higher adsorption affinity with silicate ions. As a result, we have demonstrated that the Ce oxidation state (Ce 3+ /Ce 4+ ) on the CeO 2 surface can have a significant influence on the silicate adsorption.

AB - In this study, we have investigated the role of the Ce oxidation state (Ce 3+ /Ce 4+ ) on the CeO 2 surfaces for silicate adsorption. In aqueous medium, the Ce 3+ sites lead to the formation of −OH groups at the CeO 2 surface through H 2 O dissociation. Silicate ions can adsorb onto the CeO 2 surface through interaction with the −OH groups (−Ce−OH− + −Si−O − ↔ −Ce−O−Si− + OH − ). As the Ce 3+ concentration increased from 19.3 to 27.6%, the surface density of −OH group increased from 0.34 to 0.72 OH/nm 2 . To evaluate the adsorption behaviors of silicate ions onto CeO 2 NPs, we carried out an adsorption isothermal analysis, and the adsorption isotherm data followed the Freundlich model. The Freundlich constant for the relative adsorption capacity (K F ) and adsorption intensity (1/n) indicated that CeO 2 NPs with high Ce 3+ concentration show higher adsorption affinity with silicate ions. As a result, we have demonstrated that the Ce oxidation state (Ce 3+ /Ce 4+ ) on the CeO 2 surface can have a significant influence on the silicate adsorption.

KW - Adsorption isotherm

KW - Ceria

KW - Oxidation state

KW - Particle size

KW - Silicate ions

UR - https://www.scopus.com/pages/publications/84979731588

U2 - 10.1016/j.apsusc.2016.06.193

DO - 10.1016/j.apsusc.2016.06.193

M3 - Article

AN - SCOPUS:84979731588

SN - 0169-4332

VL - 389

SP - 311

EP - 315

JO - Applied Surface Science

JF - Applied Surface Science

ER -

Role of the oxidation state of cerium on the ceria surfaces for silicate adsorption

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this