A review on the porous geopolymer preparation for structural and functional materials applications

Yu, Haoyang; Xu, Mengxue; Chen, Chaoni; He, Yan; Cui, Xuemin

doi:10.1111/ijac.14028

Cited by 36 publications

(33 citation statements)

References 264 publications

(733 reference statements)

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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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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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“…2. Incorporation of the foaming agent into a paste (in this case geopolymers called foamed or aerated geopolymers) regards the best method for the manufacture of lightweight geopolymers [7,[20][21][22]. Some techniques, such as mechanical, chemical, thermal, and irradiation approaches, can produce foamed geopolymers.…”

Section: Introductionmentioning

confidence: 99%

Physico-chemical and Mechanical Properties of Eco-friendly Ultra-lightweight Geopolymers Containing Silica Sand Fluor and Calcium Carbonate

Abbas

Soltan

Khater

et al. 2023

The Bulletin Tabbin Institute for Metallurgical Studies (TIMS)

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Low-cost lightweight geopolymer mortars based on ground granulated blast furnace slag, calcium carbonate, and silica sand flour were investigated as lightweight building materials. The effect of two chemical foaming agents such as hydrogen peroxide (H 2 O 2 ) and sodium perborate tetrahydrate (NaBO 3 .4H 2 O) on bulk density, porosity, and compressive strength was studied. FTIR, XRD, XRF, and SEM were used to investigate the raw materials and selected samples of prepared lightweight geopolymers. The use of grinding calcium carbonate and silica sand flour enhanced the compressive strength, workability, and homogeneity of the geopolymer.The lightweight geopolymer has given about 3.30 -17.60 and 1.70 -6 MPa of compressive strengths at 28 days of curing with bulk densities from 584 to 1340 kg/m 3 and 745 to 1770 kg/m 3 in the case of H 2 O 2 and NaBO 3 .4H 2 O, respectively. The images of morphology and microstructure results indicate that the porosity and pore size increase with the increase of the foaming agent due to the release of oxygen gas upon its decomposition. According to the results of bulk density MC-H1, MC-H1.25, and MC-B2.5 mixes can be considered ultra-lightweight geopolymers with proper compressive strength. The results show that hydrogen peroxide mixes have better performance in the physico-chemical and mechanical properties than sodium perborate mixes.

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“…Thus, they have a guiding significance for the resource utilization of solid waste in wastewater treatment. [4][5][6][7][8][9][10] Recently, solid wastes containing high content of aluminum and silicon (fly ash, steel slag, and so forth) are reported to be applied to be used as raw materials for the synthesis of geopolymers. 11,12 Fly ash mainly comes from thermal power plants or urban heating boilers.…”

Section: Introductionmentioning

confidence: 99%

“…Geopolymers as adsorbents have shown great development potential in the field of wastewater treatment in recent years. Thus, they have a guiding significance for the resource utilization of solid waste in wastewater treatment 4–10 …”

Section: Introductionmentioning

confidence: 99%

Synthesis and adsorption performance of fly ash/steel slag‐based geopolymer for removal of Cu (II) and methylene blue

Yan

Feng

Huang

et al. 2023

Int J Applied Ceramic Tech

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In order to realize the value-added resource utilization of solid waste, geopolymer particle adsorbents were prepared at low temperatures using silica-aluminumrich fly ash and steel slag powders as raw materials. In order to investigate the mechanism of their adsorption of dyes and heavy metal ions from wastewater, the effects of steel slag/fly ash ratio, adsorbent dosage, initial concentration of methylene blue (MB) and Cu 2+ solution, adsorption time and temperature on the adsorption performance of the fly ash/steel slag-based geopolymer adsorbents were investigated, systematically. Results presented that the adsorption capacities of MB and Cu 2+ were 33.30 and 24.15 mg/g, and the removal efficiencies were 99.90% and 96.59% with the dosages of 3 and 4 g/L geopolymer adsorbents (steel slag/fly ash ratio of 20 wt.%), respectively. The adsorption processes of MB and Cu 2+ on the adsorbents were in accordance with the proposed pseudo-second-order and Langmuir isotherm models, which mainly included physical and chemical adsorption mechanisms. The adsorption was a spontaneous endothermic process. The fly ash/steel slag-based geopolymer had good removal ability for dyes and heavy metal ions, and it could maintain good adsorption performance after three cycles of regeneration. It had potential application in wastewater treatment.

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A review on the porous geopolymer preparation for structural and functional materials applications

Cited by 36 publications

References 264 publications

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

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

Physico-chemical and Mechanical Properties of Eco-friendly Ultra-lightweight Geopolymers Containing Silica Sand Fluor and Calcium Carbonate

Synthesis and adsorption performance of fly ash/steel slag‐based geopolymer for removal of Cu (II) and methylene blue

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