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Optimization of the metakaolin geopolymer preparation for maximized ammonium adsorption capacity
- Source :
- Journal of Materials Science. 52:9363-9376
- Publication Year :
- 2017
- Publisher :
- Springer Science and Business Media LLC, 2017.
-
Abstract
- Geopolymers are functional materials that can be used in various environmental applications such as adsorbents in pollutant removal from wastewaters. Metakaolin geopolymer (MK-GP) has been proven to be especially suitable for ammonium (NH4 +) removal. In this research, the optimal reagent and raw material ratios in the preparation of MK-GP in terms of NH4 + adsorption capacity were investigated. The response surface methodology based on the face-centered central composite design was used to optimize the levels of three factors: the amounts of hydroxide, silicate, and metakaolin. In addition, the effect of Na or K as the charge-balancing cation was studied. Empirical models were fitted to the experimental data using multiple linear regression. The significance of the models was confirmed by means of analysis of variance. Optimal NH4 + removal efficiency was achieved when the amounts of hydroxide and silicate were maximized, the amount of metakaolin was minimized, and Na-based reagents were used. These trends are most likely a result of optimized conversion of metakaolin into MK-GP.
- Subjects :
- Materials science
Central composite design
Mechanical Engineering
02 engineering and technology
Raw material
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Geopolymer
chemistry.chemical_compound
Adsorption
chemistry
Chemical engineering
Mechanics of Materials
Reagent
Hydroxide
General Materials Science
Response surface methodology
Composite material
0210 nano-technology
Metakaolin
Subjects
Details
- ISSN :
- 15734803 and 00222461
- Volume :
- 52
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Science
- Accession number :
- edsair.doi...........63814b6fa065b7959aed03903711919a