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Shaping hydrotalcite-like materials into microspheres and their use for sorption applications

Elena Mihaela Seftel, Yoran De Vos UGent, Judith Pype, Bart Michielsen, Vera Meynen, Steven Mullens and Pegie Cool (2016) Annual Meeting of the Belgian and French Ceramic Societies, Abstracts.
abstract
Hydrotalcite-type materials, also called layered double hydroxides (LDHs), are a family of naturally occurring anionic clays. They are represented by the empirical formula [M2+1-xM3+x(OH)2]x+ (An-x/n) · mH2O, where: M2+ are divalent cations (Mg2+, Zn2+, Ca2+, etc.), M3+ are trivalent cations (Al3+, Fe3+, Mn3+, etc) and An- are interlayer anions (CO32-, NO3-, etc). These materials can be used in sorption applications, e. g. sorption of phosphates, due to their large surface areas, high anion-exchange capacity, and flexible interlayer region accommodating various anionic species. Moreover, their chemical composition can be easily tuned allowing not only a high ion exchange capacity but also high selectivity towards phosphate ions. However, a powder form of these sorbent materials are not suitable in wastewater treatment systems due to the mass transfer limitations or difficulties in handling and recovery at the end of the process. The focus is on structuring the powder into an optimal architecture, e.g. porous microspheres. This study explores the added value of structuring the sorbent powders into porous microspheres, with controlled porosity and pore structure. These shaping efforts should lead to a decrease of the mass transfer limitations, a lower pressure drop and faster sorption kinetics. Pural MG63HT commercial Hydrotalcite-type clay material used in the present study was provided by Sasol Germany GmbH. The powder was processed into suspensions by mixing with sodium alginate polymer which was further cross-linked into a coagulation bath containing Ca2+ ions. The shaped products were obtained using both the gravitational as well as the vibrational drip casting technique using a BRACE GmbH device for microsphere production. The research combines physico-chemical characterization (XRD, SEM, porosity measurements), material shaping (zeta potential and viscosity measurements of the slurries and suspensions) and phosphate sorption testing by UV-vis Spectroscopy.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
Gravitational drip casting, Microspheres, Vibrational drip casting, Hydrotalcite, Sorption of phosphates
in
Annual Meeting of the Belgian and French Ceramic Societies, Abstracts
place of publication
Valenciennes, France
conference name
Annual Meeting of the Belgian and French Ceramic Societies
conference location
Valenciennes, France
conference start
2016-03-22
conference end
2016-03-24
language
English
UGent publication?
no
classification
C3
id
7178350
handle
http://hdl.handle.net/1854/LU-7178350
date created
2016-04-08 13:29:04
date last changed
2018-01-29 12:12:54
@inproceedings{7178350,
  abstract     = {Hydrotalcite-type materials, also called layered double hydroxides (LDHs), are a family of naturally occurring anionic clays. They are represented by the empirical formula [M2+1-xM3+x(OH)2]x+ (An-x/n) {\textperiodcentered} mH2O, where: M2+ are divalent cations (Mg2+, Zn2+, Ca2+, etc.), M3+ are trivalent cations (Al3+, Fe3+, Mn3+, etc) and An- are interlayer anions (CO32-, NO3-, etc).

These materials can be used in sorption applications, e. g. sorption of phosphates, due to their large surface areas, high anion-exchange capacity, and flexible interlayer region accommodating various anionic species. Moreover, their chemical composition can be easily tuned allowing not only a high ion exchange capacity but also high selectivity towards phosphate ions. 

However, a powder form of these sorbent materials are not suitable in wastewater treatment systems due to the mass transfer limitations or difficulties in handling and recovery at the end of the process. The focus is on structuring the powder into an optimal architecture, e.g. porous microspheres.

This study explores the added value of structuring the sorbent powders into porous microspheres, with controlled porosity and pore structure. These shaping efforts should lead to a decrease of the mass transfer limitations, a lower pressure drop and faster sorption kinetics.

Pural MG63HT commercial Hydrotalcite-type clay material used in the present study was provided by Sasol Germany GmbH. The powder was processed into suspensions by mixing with sodium alginate polymer which was further cross-linked into a coagulation bath containing Ca2+ ions. The shaped products were obtained using both the gravitational as well as the vibrational drip casting technique using a BRACE GmbH device for microsphere production. 

The research combines physico-chemical characterization (XRD, SEM, porosity measurements), material shaping (zeta potential and viscosity measurements of the slurries and suspensions) and phosphate sorption testing by UV-vis Spectroscopy.},
  author       = {Seftel, Elena Mihaela and De Vos, Yoran and Pype, Judith and Michielsen, Bart and Meynen, Vera and Mullens, Steven and Cool, Pegie},
  booktitle    = {Annual Meeting of the Belgian and French Ceramic Societies, Abstracts},
  keyword      = {Gravitational drip casting,Microspheres,Vibrational drip casting,Hydrotalcite,Sorption of phosphates},
  language     = {eng},
  location     = {Valenciennes, France},
  title        = {Shaping hydrotalcite-like materials into microspheres and their use for sorption applications},
  year         = {2016},
}

Chicago
Seftel, Elena Mihaela, Yoran De Vos, Judith Pype, Bart Michielsen, Vera Meynen, Steven Mullens, and Pegie Cool. 2016. “Shaping Hydrotalcite-like Materials into Microspheres and Their Use for Sorption Applications.” In Annual Meeting of the Belgian and French Ceramic Societies, Abstracts. Valenciennes, France.
APA
Seftel, E. M., De Vos, Y., Pype, J., Michielsen, B., Meynen, V., Mullens, S., & Cool, P. (2016). Shaping hydrotalcite-like materials into microspheres and their use for sorption applications. Annual Meeting of the Belgian and French Ceramic Societies, Abstracts. Presented at the Annual Meeting of the Belgian and French Ceramic Societies, Valenciennes, France.
Vancouver
1.
Seftel EM, De Vos Y, Pype J, Michielsen B, Meynen V, Mullens S, et al. Shaping hydrotalcite-like materials into microspheres and their use for sorption applications. Annual Meeting of the Belgian and French Ceramic Societies, Abstracts. Valenciennes, France; 2016.
MLA
Seftel, Elena Mihaela, Yoran De Vos, Judith Pype, et al. “Shaping Hydrotalcite-like Materials into Microspheres and Their Use for Sorption Applications.” Annual Meeting of the Belgian and French Ceramic Societies, Abstracts. Valenciennes, France, 2016. Print.