The effect of natural zeolite on microstructure, mechanical and heavy metals adsorption properties of metakaolin based geopolymers

Andrejkovičová, S.; Sudagar, Alcina Johnson; Rocha, João; Patinha, Carla; Hajjaji, W.; Silva, Eduardo Ferreira da; Velosa, A. L.; Rocha, Fernando

doi:10.1016/j.clay.2016.03.009

Cited by 162 publications

(72 citation statements)

References 29 publications

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“…Geopolymers had interesting properties that are encouraged to investigated and developed. The major nature of geopolymers are tendency to drastically decrease the mobility of most heavy metals ions contained within the geopolymeric structure, quick compressive development of strength, resistance to acid and fire, fat setting, low permeability and good resistance to freeze-thaw cycles [18][19][20]. Theoretically, any alkali can be used in geopolymerization reactions; however most of the studies have focused on the effect of sodium (Na+) and potassium (K+) ions.…”

Section: Geopolymermentioning

confidence: 99%

Review on Adsorption of Heavy Metal in Wastewater by Using Geopolymer

et al. 2017

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Abstract. Rapid development of advanced technology in Malaysia gave impact increasing in the accumulation of heavy metal every day in our daily life through wastewater. Long term exposure of human bodies to heavy metals susceptible to receives various infections and diseases. From an environmental and economic perspective, adsorption is acceptable process that can be applied in wastewater treatment. However, usage of activated carbon most acknowledged and costly adsorbents lead people to find an alternative to activated carbon. Several studies of physical properties of geopolymer make them gain attention to replace an activated carbon in the treatment of heavy metal. This paper review adsorption of heavy metal by using geopolymer.

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Section: Geopolymermentioning

confidence: 99%

Review on Adsorption of Heavy Metal in Wastewater by Using Geopolymer

et al. 2017

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“…Several studies have been conducted using metakaolin as the geopolymer binder precursor [7][8][9]. These studies agree that metakaolin is a good precursor as a binder in the geopolymer reactions.…”

Section: Introductionmentioning

confidence: 68%

Mine Tailings Geopolymers as a Waste Management Solution for A More Sustainable Habitat

et al. 2019

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The demand for low environmental impact of materials in our habitat is one of the current societal challenges. Along with other solutions of waste valorisation, alkali activation as geopolymers can be one possible solution of waste valorisation because they may allow, for instance, an alternative solution for cement-based materials in some applications and it is one contribution for circular economy. This work has focused on the development and processing of geopolymers that incorporates as a fine aggregate a high-sulfidic mining waste (mine tailing), a difficult waste to process. Rheology analysis was applied as an important step to understand not only the geopolymers behaviour but also its transition from the fresh to the hardened state. The effect of precursor binder type (metakaolin or blast furnace slag), of mine tailing content and also the effect of temperature and curing conditions of different formulations were studied in this solution. It was possible to conclude that although this particular mine tailing is not a geopolymer binder precursor, it may be incorporated as an alternative fine aggregate in construction products. Furthermore, rheology could be used to follow up the geopolymer alkali-activation process and even to setup proper curing conditions and components contents in order to optimize the final mechanical strength of this material as a waste management solution. The final properties of these geopolymers compositions were adequate and after 28 days of curing, these geopolymers exhibit significant chemical resistance under severe test conditions.

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“…To date, to the best of our knowledge, good mechanical properties combined with interesting adsorption capacity have been reported in the literature only if zeolitic tuff is used as a fine aggregate in geopolymeric binders [52,53].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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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The effect of natural zeolite on microstructure, mechanical and heavy metals adsorption properties of metakaolin based geopolymers

Cited by 162 publications

References 29 publications

Review on Adsorption of Heavy Metal in Wastewater by Using Geopolymer

Review on Adsorption of Heavy Metal in Wastewater by Using Geopolymer

Mine Tailings Geopolymers as a Waste Management Solution for A More Sustainable Habitat

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

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