Preparation and characterization of porous and stable sodium- and potassium-based alkali activated material (AAM)

Christophliemk, M.P.; Pikkarainen, A.T.; Heponiemi, Anne; Tuomikoski, S.; Runtti, Hanna; Hu, Tao; Kantola, Anu M.; Lassi, U.

doi:10.1016/j.clay.2022.106697

Cited by 7 publications

(2 citation statements)

References 54 publications

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“…Alkali cations (Na + /K + ) and an anion of hydroxides make up an alkaline solution (MOH, where M = Na + or K + ) (OHions). The negative charge of the aluminate tetrahedral AlO 4 is stabilised by the presence of both cations and anions in an alkaline solution, which permits the breakdown of bonds on the surface of the raw materials [92,93]. A highly concentrated alkaline solution is needed to achieve the high SiO 2 dissolving rate from waste and the early gelation with minimal curing time [94].…”

Section: Concentration Of Alkaline Solutionsmentioning

confidence: 99%

Waste Glass Upcycling Supported by Alkali Activation: An Overview

Zafar,

Elsayed,

Bernardo

2024

Materials

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Alkali-activated materials are gaining much interest due to their outstanding performance, including their great resistance to chemical corrosion, good thermal characteristics, and ability to valorise industrial waste materials. Reusing waste glasses in creating alkali-activated materials appears to be a viable option for more effective solid waste utilisation and lower-cost products. However, very little research has been conducted on the suitability of waste glass as a prime precursor for alkali activation. This study examines the reuse of seven different types of waste glasses in the creation of geopolymeric and cementitious concretes as sustainable building materials, focusing in particular on how using waste glasses as the raw material in alkali-activated materials affects the durability, microstructures, hydration products, and fresh and hardened properties in comparison with using traditional raw materials. The impacts of several vital parameters, including the employment of a chemical activator, gel formation, post-fabrication curing procedures, and the distribution of source materials, are carefully considered. This review will offer insight into an in-depth understanding of the manufacturing and performance in promising applications of alkali-activated waste glass in light of future uses. The current study aims to provide a contemporary review of the chemical and structural properties of glasses and the state of research on the utilisation of waste glasses in the creation of alkali-activated materials.

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Section: Concentration Of Alkaline Solutionsmentioning

confidence: 99%

Waste Glass Upcycling Supported by Alkali Activation: An Overview

Zafar,

Elsayed,

Bernardo

2024

Materials

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“…In recent years, foamed materials have gained increased attention in water remediation due to their high thermal stability and porous structure [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. Numerous studied focused on utilizing alkali-activated foamed materials for the removal of contaminants from water [ 23 , 24 , 25 ]. Foamed materials produced from alkali-activated fly ash [ 26 ], volcanic tuffs [ 27 ], and hypergolic coal gangue were utilized in the removal of water contaminants.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Foamed Glass as an Effective Adsorbent for Methylene Blue: Insights into Physicochemical Properties and Theoretical Treatment

et al. 2023

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This study reports a potential approach for the valorization of glass waste (GW) that is mainly composed of amorphous silica to prepare lightweight foamed glass (FG). The preparation of FG was achieved by mixing sodium hydroxide with GW powder followed by sintering at a temperature of 800 °C. As-synthesized FG was characterized and applied as an effective adsorbent for the removal of hazardous organic water contaminants, in particular, methylene blue (MB) dye. FG exhibited porosity of 91%, bulk density of 0.65 g/cm3, compressive strength of 4 MPa, and thermal conductivity of 0.27 W/m·K. Theoretical treatment indicated that a monolayer model with one energy site was the best in fitting the removal of MB molecules. The number of MB molecules per active site (n) ranged from 2.20 to 1.70, suggesting vertical orientation and a multi-molecular adsorption mechanism. The density of FG receptor sites (DM) increased with the temperature, and this parameter played a vital role in the adsorption process. The adsorption capacity (Qsat) increased from 255.11 to 305.58 mg/g, which signifies endothermic interactions. MB adsorption on FG was controlled by physical forces such as electrostatic interactions (i.e., the adsorption energies were <20 kJ/mol). The results of this study prove the feasibility of glass waste as an effective and low-cost adsorbent for water remediation.

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