Geopolymer/PEG Hybrid Materials Synthesis and Investigation of the Polymer Influence on Microstructure and Mechanical Behavior

Catauro, Michelina; Papale, Ferdinando; Lamanna, Giuseppe; Bollino, Flavia

doi:10.1590/1516-1439.342814

Cited by 79 publications

(22 citation statements)

References 36 publications

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“…The DRIFT method, which was used to determine the sample structure, showed only small differences between the natural zeolite and the prepared foam samples (Figure 3). Bands characteristic for aluminosilicates and alkali-activated materials are visible in the DRIFT spectra [19][20][21][22][23]. In the measured spectra, there was a typical broadband (3400-3700 cm −1 ) related to the stretching vibration of bridged hydroxyl groups (Si-OH) in zeolite channels [24].…”

Section: Influence Of Acid Leachingmentioning

confidence: 94%

Acid and Thermal Treatment of Alkali-Activated Zeolite Foams

et al. 2019

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The foamed alkali-activated zeolite materials have been studied primarily in terms of mechanical and structural properties as potential substitutes for concrete and other building materials. However, they also have interesting textural and acid properties that make them much more useful, especially in the chemical industry. The aim of the study is to map in detail the influence of post-synthesis modifications of alkali-activated natural zeolite foams on their chemical, mechanical, and textural properties for possible use in catalytic and adsorption applications. Alkali-activated natural zeolite foam pellets were prepared by activation with mixed potassium hydroxide and sodium silicate activator and foamed using H2O2 solution. The foam pellets were post-synthetic modified by leaching with mineral and organic acids and calcination. The properties of the modified materials were characterised on the basis of XRF, XRD, N2 physisorption, DRIFT, SEM, NH3-TPD analyses, and the strength measurements. Our data showed that the basic clinoptilolite structure remains unchanged in the material which is stable up to 600 °C after acid leaching. In two-step leaching, the specific surface area increases to 350 m2/g and the leaching process allows the acid properties of the materials to be varied.

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Section: Influence Of Acid Leachingmentioning

confidence: 94%

Acid and Thermal Treatment of Alkali-Activated Zeolite Foams

et al. 2019

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“…After calcination, the synthesized aluminosilicates were crushed in a mortar and then sieved. The powders with an average diameter <80 μm were activated according to a procedure reported elsewhere . An alkaline solution was used, previously prepared by mixing a sodium silicate solution (Sigma Aldrich), consisting of SiO 2 26.5 wt% and Na 2 O 10.6 wt%, and sodium hydroxide pellets (Sigma Aldrich).…”

Section: Methodsmentioning

confidence: 99%

“…The powders with an average diameter <80 lm were activated according to a procedure reported elsewhere. 32 An alkaline solution was used, previously prepared by mixing a sodium silicate solution (Sigma Aldrich), consisting of SiO 2 26.5 wt% and Na 2 O 10.6 wt%, and sodium hydroxide pellets (Sigma Aldrich). The composition of the obtained solution was Na 2 OÁ1.2SiO 2 Á9.4H 2 O.…”

Section: Geopolymer Preparationmentioning

confidence: 99%

Al₂O₃·2SiO₂ powders synthesized via sol–gel as pure raw material in geopolymer preparation

et al. 2017

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Geopolymers are inorganic aluminosilicates mainly proposed as environmentally friendly building materials, which are obtained by alkali activation of natural minerals, calcined clay (e.g., metakaolin) and other aluminosilicate sources. The wide range of chemical and mineralogical compositions of these raw materials influences several properties of the obtained geopolymers. In the present work, pure Al2O3·2SiO2 powders were synthesized via the sol–gel technique and proposed as pure aluminosilicate sources to prepare alkali activated geopolymers. Samples differing in the ratio between the SiO2 precursor and the H2O used in the sol–gel process were prepared, in order to study the effect of water content on the material structure and reactivity. The chemical structure of all the obtained Al2O3·2SiO2 powders were characterized by Fourier transform infrared (FT‐IR) and solid‐state nuclear magnetic resonance (27Al and 29Si MAS NMR) spectroscopies and compared to that of a reference metakaolin. Moreover, material reactivity was evaluated by alkali activation of the samples. After 28 days of ageing, 27Al and 29Si MAS NMR and FT‐IR spectra ascertained the formation of a geopolymeric network in the activated samples. The results showed that lower water content allows obtaining a homogeneous Al‐rich geopolymer similar to that obtained, using metakaolin as raw material.

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“…In order to be used in the geopolymerization, the oxide-aluminosilicate must present the aluminum cations in 4-fold coordination, occupying a tetrahedral position relative to the oxygen. Some examples of minerals that after calcination meet this basic requirement are tosudite, kaolinite, halloysite, amesite and chamosite 2,3,4 . Aluminum is responsible for the cross-linking between the polymeric chains, which results in the configuration of the 3-D network of the geopolymer.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical Characterization of Pulverized Phyllite Rock for Geopolymer Resin Synthesis

et al. 2017

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Geopolymeric materials have some unique properties such as early-high compressive strength, durability, resistance to acids and sulfates, ability to immobilize toxic and radioactive compounds, low porosity and high temperature resistance. These materials are strategic for sustainable development and are a suitable alternative to Portland cement. The use of phyllite as a geopolymer precursor is encouraged by its abundance, low cost, and the fact that it is already applied in ceramic industries as a kaolin substitute. The objective of this paper is the physicochemical characterization of geopolymeric resin using two pulverized phyllite rocks as precursors with STEM, XRD and XRF techniques. It was found that both phyllite rocks studied have a high quartz content of approximately 50% (weight), which have a "filler" function in the microstructure of the resin helping stabilize residual tensions after curing. Kaolinite and muscovite minerals are present in up to 40% (weight) and are responsible for the high compressive strength of the geopolymer resins.

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Geopolymer/PEG Hybrid Materials Synthesis and Investigation of the Polymer Influence on Microstructure and Mechanical Behavior

Cited by 79 publications

References 36 publications

Acid and Thermal Treatment of Alkali-Activated Zeolite Foams

Acid and Thermal Treatment of Alkali-Activated Zeolite Foams

Al₂O₃·2SiO₂ powders synthesized via sol–gel as pure raw material in geopolymer preparation

Physicochemical Characterization of Pulverized Phyllite Rock for Geopolymer Resin Synthesis

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Geopolymer/PEG Hybrid Materials Synthesis and Investigation of the Polymer Influence on Microstructure and Mechanical Behavior

Cited by 79 publications

References 36 publications

Acid and Thermal Treatment of Alkali-Activated Zeolite Foams

Acid and Thermal Treatment of Alkali-Activated Zeolite Foams

Al2O3·2SiO2 powders synthesized via sol–gel as pure raw material in geopolymer preparation

Physicochemical Characterization of Pulverized Phyllite Rock for Geopolymer Resin Synthesis

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Product

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Al₂O₃·2SiO₂ powders synthesized via sol–gel as pure raw material in geopolymer preparation