Geopolymer Building Materials Based on Fly Ash in Terms of Removing SO2, CO2, and Water Vapor

Zarębska, Katarzyna; Szczurowski, Jakub; Gazda-Grzywacz, Magdalena; Wróbel, W.; Bator, Jakub; Baran, Paweł

doi:10.3390/en16135188

Cited by 4 publications

(2 citation statements)

References 36 publications

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“…The hydrothermal method for the synthesis of zeolites from fly ash uses aqueous solutions of sodium hydroxide and potassium hydroxide at a range of concentrations. In addition to the obtained zeolite, a large amount of highly alkaline liquid is produced [93][94][95]. The idea of a circular economy is about using all waste as much as possible.…”

Section: Synergy Of Zeolite and Geopolymer Synthesis Using Fly Ashmentioning

confidence: 99%

Management of Fly Ash to Synthesise Geopolymers and Zeolites

Baran,

Sobala,

Szczurowski

et al. 2023

Energies

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The purpose of the article was to conduct an in-depth literature review on the possibilities of managing combustion by-products (mainly fly ash) in the context of a closed-loop economy. First, information on the chemical composition of fly ash in Poland was collected and compared with the composition of fly ash in other European countries. The authors concentrated on describing methods for synthesizing geopolymers and zeolites using fly ash as a substrate. By-products of zeolite synthesis, which are strongly alkaline solutions, can be used as a substrate in the synthesis of geopolymers. A concept has been proposed to combine the synthesis of zeolites and geopolymers into a single process to close the material loop. The search for comprehensive technological solutions that take into account the ideas of a closed-loop economy is essential in an era of resource depletion, and this literature review encapsulates this topic area.

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Section: Synergy Of Zeolite and Geopolymer Synthesis Using Fly Ashmentioning

confidence: 99%

Management of Fly Ash to Synthesise Geopolymers and Zeolites

Baran,

Sobala,

Szczurowski

et al. 2023

Energies

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“…Their chemical composition involves high contents of CaO, SiO 2 , Cl (chlorides), K 2 O, Na 2 O, SO 3 , and heavy metal oxides. There are, however, limited data considering the effect of various alkali activation treatments on the mechanical properties of solid products, which is reported to not exceed 10 MPa (compressive strength) [ 28 , 29 ]. For example, in the work of Beaino et al [ 30 ], the addition of waste biomass (rice husk) to high-calcium fly ash did not significantly improve the compressive strength of the material, which was reported to be <3 MPa.…”

Section: Introductionmentioning

confidence: 99%

Decarbonatization of Energy Sector by CO2 Sequestration in Waste Incineration Fly Ash and Its Utilization as Raw Material for Alkali Activation

Mokrzycki,

Baran,

Gazda-Grzywacz

et al. 2023

Materials

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In this study, municipal solid waste incineration (MSWI) fly ash was subjected to mineral carbonation with the aim of investigating CO2 sequestration in waste material. The conducted study follows the trend of searching for alternatives to natural mineral materials with the ability to sequestrate CO2. The mineral carbonation of MSWI fly ash allowed for the storage of up to 0.25 mmol CO2 g−1. Next, both carbonated and uncarbonated MSWI fly ashes were activated using an alkaline activation method by means of two different activation agents, namely potassium hydroxide and potassium silicate or sodium hydroxide and sodium silicate. Mineral carbonation caused a drop in the compressive strength of alkali-activated materials, probably due to the formation of sodium and/or potassium carbonates. The maximum compressive strength obtained was 3.93 MPa after 28 days for uncarbonated fly ash activated using 8 mol dm−3 KOH and potassium hydroxide (ratio 3:1). The relative ratio of hydroxide:silicate also influenced the mechanical properties of the materials. Both carbonated and uncarbonated fly ashes, as well as their alkali-activated derivatives, were characterized in detail by means of XRD, XRF, and FTIR. Both uncarbonated and carbonated fly ashes were subjected to TG analysis. The obtained results have proved the importance of further research in terms of high-calcium fly ash (HCFA) utilization.

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