Ceramic-like membranes without sintering via alkali activation of metakaolin, blast furnace slag, or their mixture: Characterization and cation-exchange properties

Luukkonen, Tero; Olsen, Elisa; Turkki, Auli; Muurinen, Esa

doi:10.1016/j.ceramint.2022.11.252

Cited by 16 publications

(6 citation statements)

References 49 publications

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“…The measured shrinkage in high- and medium-Ca foams, BFS, and BFS–MK foams was higher than that in low-Ca foams. These results are similar to those reported in an earlier study . Based on the shrinkage results, the MK foam was selected for disinfection and further study.…”

Section: Resultssupporting

confidence: 88%

“…Shrinkage can be mitigated by decreasing the filter dimensions or by using fiber reinforcements. Drying shrinkage is the result of evaporation of weakly bound water molecules, whereas autogenous shrinkage is the result of water consumption during the formation of new mineral phases such as alkali or alkaline earth metal aluminosilicate gels . Therefore, shrinkage (i.e., length change) in AAFs using the optimum H 2 O 2 amount was studied at ambient conditions up to the point it reached a constant value [Figure b].…”

Section: Resultsmentioning

confidence: 99%

“…Drying shrinkage is the result of evaporation of weakly bound water molecules, whereas autogenous shrinkage is the result of water consumption during the formation of new mineral phases such as alkali or alkaline earth metal aluminosilicate gels. 58 Therefore, shrinkage (i.e., length change) in AAFs using the optimum H 2 O 2 amount was studied at ambient conditions up to the point it reached a constant value [Figure 1b]. For example, the porosity, composition, and curing conditions of the material affect the length change.…”

Section: Comparison Of Aluminosilicate Precursors Andmentioning

confidence: 99%

“…These results are similar to those reported in an earlier study. 58 Based on the shrinkage results, the MK foam was selected for disinfection and further study.…”

Section: Comparison Of Aluminosilicate Precursors Andmentioning

confidence: 99%

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Alkali-Activated Foams Coated with Colloidal Ag for Point-of-Use Water Disinfection

Bhuyan,

Karkman,

Prokkola

et al. 2024

ACS EST Water

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Alkali-activated foams are ceramic-like materials prepared at near-ambient temperature. This study investigates them for point-of-use water disinfection, thus providing an alternative to ceramic filters fired at a high temperature. Alkali-activated foams with different compositions were characterized for the porosity, mechanical strength, shrinkage, and microstructure. The optimized foam, employing metakaolin as the raw material, was coated with a colloidal Ag solution. The disinfection performance and leaching behavior of the foams was followed in a continuous 10 week experiment, where clean water with a weekly pulse of contaminated water was distributed through the foam. The average inactivation of Escherichia coli with the Ag-coated foam was 2.84 log10, which was 1.27 units higher compared to foam without Ag. A quantitative polymerase chain reaction analysis and metagenomic sequencing verified that foams with and without Ag were both capable of reducing the microbial load. Furthermore, the changes induced by the foam with Ag on the microbial community composition, antibiotic resistome, and metal and biocide resistomes were significant. The leached concentrations of Ag, Na, Si, and Al were in accordance with the drinking water guidelines. Finally, a life cycle assessment indicated the possibility of reducing the global warming potential and the total embodied energy in comparison with a conventional ceramic filter.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Comparison Of Aluminosilicate Precursors Andmentioning

confidence: 99%

“…These results are similar to those reported in an earlier study. 58 Based on the shrinkage results, the MK foam was selected for disinfection and further study.…”

Section: Comparison Of Aluminosilicate Precursors Andmentioning

confidence: 99%

See 2 more Smart Citations

Alkali-Activated Foams Coated with Colloidal Ag for Point-of-Use Water Disinfection

Bhuyan,

Karkman,

Prokkola

et al. 2024

ACS EST Water

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“…109 With geopolymer or alkali-activated membranes and membrane supports, the target is to obtain similar properties as with ceramic membranes (e.g., enhanced service life over organic polymer membranes) but with clearly reduced costs. 115 Promising results have been obtained when using geopolymer and AAMs in micro-or ultrafiltration pressure area to separate suspended or dissolved solids (e.g., 116,117 ). Another reported application is the pervaporation of water/ethanol.…”

Section: From Construction Materials To High-end Technical Applicationsmentioning

confidence: 99%

Why geopolymers and alkali‐activated materials are key components of a sustainable world: A perspective contribution

Kriven,

Leonelli,

Provis

et al. 2024

J Am Ceram Soc.

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This perspective article delves into the transformative potential of alkali‐activated materials, acid‐activated materials, and geopolymers in mitigating climate change and market challenges. To harness the benefits of these materials, a comprehensive strategy is proposed. This strategy aims to integrate these materials into existing construction regulations, facilitate certification, and promote market access. Emphasizing research and innovation, the article advocates for, increased funding to refine the chemistry and production of these materials, prioritizing low‐cost alternatives and local waste materials. Collaboration between academia and industry is encouraged to expedite technological advances and broaden applications. This article also underscores the need to develop economic and business models emphasizing the long‐term benefits of these materials, including lower life‐cycle costs and reduced environmental impact. Incentivizing adoption through financial mechanisms like tax credits and subsidies is suggested. The strategy also includes scaling up production technology, fostering industrial collaboration for commercial viability, and developing global supply chains. Educational programs for professionals and regulators are recommended to enhance awareness and adoption. Additionally, comprehensive life‐cycle assessments are proposed to demonstrate environmental benefits. The strategy culminates in expanding the applications of these materials beyond construction, fostering international collaboration for knowledge sharing, and thus positioning these materials as essential for sustainable construction and climate change mitigation.

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Optimization of ceramic membrane fabricated from coal flyash blended with natural clay for separation of kraft lignin from aqueous solutions

Saxena,

Soni,

Jayapal

2024

Biomass Conv. Bioref.

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Ceramic-like membranes without sintering via alkali activation of metakaolin, blast furnace slag, or their mixture: Characterization and cation-exchange properties

Cited by 16 publications

References 49 publications

Alkali-Activated Foams Coated with Colloidal Ag for Point-of-Use Water Disinfection

Alkali-Activated Foams Coated with Colloidal Ag for Point-of-Use Water Disinfection

Why geopolymers and alkali‐activated materials are key components of a sustainable world: A perspective contribution

Optimization of ceramic membrane fabricated from coal flyash blended with natural clay for separation of kraft lignin from aqueous solutions

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