Preparation, structure and properties of hybrid materials based on geopolymers and polysiloxanes

Roviello, Giuseppina; Menna, Costantino; Tarallo, Oreste; Ricciotti, Laura; Ferone, Claudio; Colangelo, Francesco; Asprone, Domenico; Maggio, R. Di; Cappelletto, Elisa; Prota, Andrea; Cioffi, Raffaele

doi:10.1016/j.matdes.2015.08.006

Cited by 69 publications

(62 citation statements)

References 45 publications

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“…The advantage in the obtainment and use of hybrid geopolymer-based materials with respect to unmodified geopolymers relies in the fact that the homogeneous combination of inorganic and organic moieties in a single-phase material provides unique possibilities to obtain properties that are not found in the organic polymer or in the inorganic materials independently. In particular, the produced hybrid foams show significantly increased mechanical properties [33] with respect to the unmodified geopolymer reported in the literature [46][47][48][49][50].…”

Section: Porous Hybrid Geopolymeric Materials: Preparation and Microsmentioning

confidence: 88%

“…Hybrid polysiloxane-geopolymer slurries were prepared as described elsewhere [33,39]. In order to obtain a set of samples characterized by a different degree of porosity, silicon powder was added to two distinct aliquots of the hybrid suspensions in 0.03 wt% and 0.12 wt% ratios, and then the whole system was mixed for a further 5 min at 1000 rpm.…”

Section: Preparation Of Hybrid Geopolymer Foams (Gsil)mentioning

confidence: 99%

“…Therefore, the removal of heavy metal cations from the wastewater of industrial or agricultural activities, before they are released practical applications in aqueous environments than the unmodified geopolymers. As a matter of fact, geopolymeric hybrid foams combine (i) a tunable porosity and morphology with versatile rheological properties that make them easy to mold; (ii) good mechanical properties after the consolidation, which makes them useful for the production of reusable large filters or membranes that are capable of being recovered intact after use; and (iii) a simple, environmentally friendly, and cheap process of production [33,39].…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Geopolymeric Foams for the Removal of Metallic Ions from Aqueous Waste Solutions

et al. 2019

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For the first time, hybrid organic–inorganic geopolymeric foams were successfully used as monolithic adsorbents for the removal of metallic ions pollutants from wastewaters. The foams were realized by the in situ foaming of a hybrid geopolymer obtained by a reaction of metakaolin and polysiloxane oligomers under strong alkaline conditions and then cured at room temperature. In this way, porous materials with densities ranging from 0.4 to 0.7 g/cm3 and showing good mechanical properties were produced. With the aim of producing self-standing monolithic adsorbents for the removal of metallic ions pollutants from wastewaters, these porous hybrid geopolymers were subjected to a washing pretreatment with ultrapure water, dried, and then used for absorption tests by dipping them into an aqueous solution with an initial concentration of 20 ppm of Pb2+, Cd2+, Cu2+, and Zn2+ ions. Preliminary results indicated that all the tested materials are effective in the adsorption of the tested metal ions and do not release the removed metal ions upon sinking in ultrapure water, even for a very long time. Interestingly, compressive strength tests performed before and after the washing treatments show that the foamed samples remain intact and maintain their physical–mechanical characteristics, suggesting that these kinds of materials are promising candidates for the production of self-standing, monolithic adsorbent substrates that can be easily collected when exhausted, which is a major advantage in comparison with the use of powdered adsorbents. Moreover, since these materials can be obtained by a simple and versatile experimental procedure, they could be easily shaped or directly foamed into precast molds to be used in packed beds as membranes.

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Section: Porous Hybrid Geopolymeric Materials: Preparation and Microsmentioning

confidence: 88%

Section: Preparation Of Hybrid Geopolymer Foams (Gsil)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hybrid Geopolymeric Foams for the Removal of Metallic Ions from Aqueous Waste Solutions

et al. 2019

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“…Is it possible to observe that the addition of epoxy and siloxanic resins led to a decrease of the maximum tensile strength with respect to the metakaolin based geopolymer. This could be due to the different microstructures characterizing the different investigated materials [8,13]. In particular, GEO samples have a rather irregular microstructure with diffused nanopores due to the evaporation of the reaction water.…”

Section: Resultsmentioning

confidence: 99%

“…Hybrid-organic (Geo-Epoxy) and inorganic (Geo-SIL) samples were prepared by incorporating a commercial epoxy and siloxanic resin, according to the 10% of weight content, into the freshly prepared geopolymeric suspension under mechanical stirring, when the polycondensation reactions of the components were already started but far to be completed [8,13].…”

Section: Geopolymer-based Materialsmentioning

confidence: 99%

Tensile behaviour of geopolymer-based materials under medium and high strain rates

Menna

Asprone

Forni

et al. 2015

EPJ Web of Conferences

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Abstract. Geopolymers are a promising class of inorganic materials typically obtained from an alluminosilicate source and an alkaline solution, and characterized by an amorphous 3-D framework structure. These materials are particularly attractive for the construction industry due to mechanical and environmental advantages they exhibit compared to conventional systems. Indeed, geopolymer-based concretes represent a challenge for the large scale uses of such a binder material and many research studies currently focus on this topic. However, the behaviour of geopolymers under high dynamic loads is rarely investigated, even though it is of a fundamental concern for the integrity/vulnerability assessment under extreme dynamic events. The present study aims to investigate the effect of high dynamic loading conditions on the tensile behaviour of different geopolymer formulations. The dynamic tests were performed under different strain rates by using a Hydro-pneumatic machine and a modified Hopkinson bar at the DynaMat laboratory of the University of Applied Sciences of Southern Switzerland. The results are processed in terms of stress-strain relationships and strength dynamic increase factor at different strain-rate levels. The dynamic increase factor was also compared with CEB recommendations. The experimental outcomes can be used to assess the constitutive laws of geopolymers under dynamic load conditions and implemented into analytical models.

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Eco-design of geopolymer-based materials recycling porcelain stoneware wastes: a life cycle assessment study

Ricciotti¹,

Occhicone

Ferone

et al. 2023

Environ Dev Sustain

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Preparation, structure and properties of hybrid materials based on geopolymers and polysiloxanes

Cited by 69 publications

References 45 publications

Hybrid Geopolymeric Foams for the Removal of Metallic Ions from Aqueous Waste Solutions

Hybrid Geopolymeric Foams for the Removal of Metallic Ions from Aqueous Waste Solutions

Tensile behaviour of geopolymer-based materials under medium and high strain rates

Eco-design of geopolymer-based materials recycling porcelain stoneware wastes: a life cycle assessment study

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