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Removal of ammonium from wastewater with geopolymer sorbents fabricated via additive manufacturing
- Source :
- Materials & Design, Vol 195, Iss, Pp 109006-(2020)
- Publication Year :
- 2020
- Publisher :
- Elsevier Ltd, 2020.
-
Abstract
- Geopolymers have been recently explored as sorbents for wastewater treatment, thanks to their mechanical and chemical stability and to their low-energy manufacturing process. One specific application could be the removal of ammonium (NH4+) through exchange with Na+ ions. Additive manufacturing (AM) represents an especially interesting option for fabrication, as it allows to tailor the size, distribution, shape, and interconnectivity of pores, and therefore the access to charge-bearing sites. The present study provides a proof of concept for NH4+ removal from wastewater using porous geopolymer components fabricated via direct ink writing (DIW) AM approach. A metakaolin-based ink was employed for the fabrication of a log-pile structure with 45° rotation between layers, producing continuous yet tortuous macropores which are responsible for the high permeability of the sorbents. The ink consolidates in an amorphous, mesoporous network, with the mesopores acting as preferential sites for ion exchange. The printed sorbents were characterized for their physicochemical and mechanical properties and the NH4+ removal capacity in continuous-flow column experiments by using a model effluent. The lattices present high permeability and high cation exchange capacity and maintained a high amount of active ions after four cycles, allowing to reuse them multiple times.
- Subjects :
- Fabrication
Materials science
Additive manufacturing
Nitrogen
02 engineering and technology
Ammonium removal
Direct ink writing
Geopolymer
Wastewater
010402 general chemistry
01 natural sciences
lcsh:TA401-492
Cation-exchange capacity
General Materials Science
Porosity
Metakaolin
Ion exchange
Mechanical Engineering
021001 nanoscience & nanotechnology
6. Clean water
0104 chemical sciences
Chemical engineering
Mechanics of Materials
lcsh:Materials of engineering and construction. Mechanics of materials
0210 nano-technology
Mesoporous material
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Materials & Design, Vol 195, Iss, Pp 109006-(2020)
- Accession number :
- edsair.doi.dedup.....f293534924138a8b24115ee789e12555