Sorption of H3BO3/B(OH)4 - on calcined LDHs including different divalent metals

Xinhong Qiu, Keiko Sasaki, Kwadwo Osseo-Asare, Tsuyoshi Hirajima, Keiko Ideta, Jin Miyawaki

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

LDHs with different divalent metals (Zn-LDH, Mg-LDH and Ca-LDH) have been synthesized and produced calcined LDHs (Zn-CLDH, Mg-CLDH and Ca-CLDH) for borate removal. Based on XRD, SEM, BET, 27Al NMR, CO2-TPD, and 11B NMR, detailed characterization of different CLDHs before and after reaction with the boron species was systematically performed. The surface area, basicity and the particle charge of the different CLDHs, which are related to the hydration and regeneration, were markably influenced by the nature of the divalent metals. Transformation of crystal phases and the types of boron species adsorbed by the different CLDHs varied as time changed. The regeneration of Ca-CLDH required the shortest time. However, Ca-LDH decomposed to release Ca2+ ions, forming ettringite with borate. Zn-CLDH also rapidly transformed into Zn-LDH. During this reconstruction, B(OH)4 - was intercalated into the interlayer of Zn-LDHs, which is the predominant mechanism of borate removal by Zn-CLDH. Increase in the initial pH caused a competition between borate and OH- so that the removal efficiency of borate by Zn-CLDH decreased. For Mg-CLDH, surface complexation and electrostatic attraction were included in the first stage, immobilizing boric acid into Mg(OH)2 and attracting borate as interlayer anionic species into the new forming Mg-LDHs in the second stage.

Original languageEnglish
Pages (from-to)183-194
Number of pages12
JournalJournal of Colloid And Interface Science
Volume445
DOIs
Publication statusPublished - May 1 2015

Fingerprint

Borates
Sorption
Metals
Boron
Nuclear magnetic resonance
Boric acid
Temperature programmed desorption
Alkalinity
Complexation
Hydration
Electrostatics
Ions
Crystals
Scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Cite this

Sorption of H3BO3/B(OH)4 - on calcined LDHs including different divalent metals. / Qiu, Xinhong; Sasaki, Keiko; Osseo-Asare, Kwadwo; Hirajima, Tsuyoshi; Ideta, Keiko; Miyawaki, Jin.

In: Journal of Colloid And Interface Science, Vol. 445, 01.05.2015, p. 183-194.

Research output: Contribution to journalArticle

Qiu, Xinhong ; Sasaki, Keiko ; Osseo-Asare, Kwadwo ; Hirajima, Tsuyoshi ; Ideta, Keiko ; Miyawaki, Jin. / Sorption of H3BO3/B(OH)4 - on calcined LDHs including different divalent metals. In: Journal of Colloid And Interface Science. 2015 ; Vol. 445. pp. 183-194.
@article{e668a0838afa4758a01b383370dc0449,
title = "Sorption of H3BO3/B(OH)4 - on calcined LDHs including different divalent metals",
abstract = "LDHs with different divalent metals (Zn-LDH, Mg-LDH and Ca-LDH) have been synthesized and produced calcined LDHs (Zn-CLDH, Mg-CLDH and Ca-CLDH) for borate removal. Based on XRD, SEM, BET, 27Al NMR, CO2-TPD, and 11B NMR, detailed characterization of different CLDHs before and after reaction with the boron species was systematically performed. The surface area, basicity and the particle charge of the different CLDHs, which are related to the hydration and regeneration, were markably influenced by the nature of the divalent metals. Transformation of crystal phases and the types of boron species adsorbed by the different CLDHs varied as time changed. The regeneration of Ca-CLDH required the shortest time. However, Ca-LDH decomposed to release Ca2+ ions, forming ettringite with borate. Zn-CLDH also rapidly transformed into Zn-LDH. During this reconstruction, B(OH)4 - was intercalated into the interlayer of Zn-LDHs, which is the predominant mechanism of borate removal by Zn-CLDH. Increase in the initial pH caused a competition between borate and OH- so that the removal efficiency of borate by Zn-CLDH decreased. For Mg-CLDH, surface complexation and electrostatic attraction were included in the first stage, immobilizing boric acid into Mg(OH)2 and attracting borate as interlayer anionic species into the new forming Mg-LDHs in the second stage.",
author = "Xinhong Qiu and Keiko Sasaki and Kwadwo Osseo-Asare and Tsuyoshi Hirajima and Keiko Ideta and Jin Miyawaki",
year = "2015",
month = "5",
day = "1",
doi = "10.1016/j.jcis.2014.12.093",
language = "English",
volume = "445",
pages = "183--194",
journal = "Journal of Colloid and Interface Science",
issn = "0021-9797",
publisher = "Academic Press Inc.",

}

TY - JOUR

T1 - Sorption of H3BO3/B(OH)4 - on calcined LDHs including different divalent metals

AU - Qiu, Xinhong

AU - Sasaki, Keiko

AU - Osseo-Asare, Kwadwo

AU - Hirajima, Tsuyoshi

AU - Ideta, Keiko

AU - Miyawaki, Jin

PY - 2015/5/1

Y1 - 2015/5/1

N2 - LDHs with different divalent metals (Zn-LDH, Mg-LDH and Ca-LDH) have been synthesized and produced calcined LDHs (Zn-CLDH, Mg-CLDH and Ca-CLDH) for borate removal. Based on XRD, SEM, BET, 27Al NMR, CO2-TPD, and 11B NMR, detailed characterization of different CLDHs before and after reaction with the boron species was systematically performed. The surface area, basicity and the particle charge of the different CLDHs, which are related to the hydration and regeneration, were markably influenced by the nature of the divalent metals. Transformation of crystal phases and the types of boron species adsorbed by the different CLDHs varied as time changed. The regeneration of Ca-CLDH required the shortest time. However, Ca-LDH decomposed to release Ca2+ ions, forming ettringite with borate. Zn-CLDH also rapidly transformed into Zn-LDH. During this reconstruction, B(OH)4 - was intercalated into the interlayer of Zn-LDHs, which is the predominant mechanism of borate removal by Zn-CLDH. Increase in the initial pH caused a competition between borate and OH- so that the removal efficiency of borate by Zn-CLDH decreased. For Mg-CLDH, surface complexation and electrostatic attraction were included in the first stage, immobilizing boric acid into Mg(OH)2 and attracting borate as interlayer anionic species into the new forming Mg-LDHs in the second stage.

AB - LDHs with different divalent metals (Zn-LDH, Mg-LDH and Ca-LDH) have been synthesized and produced calcined LDHs (Zn-CLDH, Mg-CLDH and Ca-CLDH) for borate removal. Based on XRD, SEM, BET, 27Al NMR, CO2-TPD, and 11B NMR, detailed characterization of different CLDHs before and after reaction with the boron species was systematically performed. The surface area, basicity and the particle charge of the different CLDHs, which are related to the hydration and regeneration, were markably influenced by the nature of the divalent metals. Transformation of crystal phases and the types of boron species adsorbed by the different CLDHs varied as time changed. The regeneration of Ca-CLDH required the shortest time. However, Ca-LDH decomposed to release Ca2+ ions, forming ettringite with borate. Zn-CLDH also rapidly transformed into Zn-LDH. During this reconstruction, B(OH)4 - was intercalated into the interlayer of Zn-LDHs, which is the predominant mechanism of borate removal by Zn-CLDH. Increase in the initial pH caused a competition between borate and OH- so that the removal efficiency of borate by Zn-CLDH decreased. For Mg-CLDH, surface complexation and electrostatic attraction were included in the first stage, immobilizing boric acid into Mg(OH)2 and attracting borate as interlayer anionic species into the new forming Mg-LDHs in the second stage.

UR - http://www.scopus.com/inward/record.url?scp=84921465560&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84921465560&partnerID=8YFLogxK

U2 - 10.1016/j.jcis.2014.12.093

DO - 10.1016/j.jcis.2014.12.093

M3 - Article

VL - 445

SP - 183

EP - 194

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

SN - 0021-9797

ER -