Synthesis of Geopolymers Using Local Resources for Construction and Water Purification

Hamaideh, Arwa; Al-Qarallah, Bassam; Hamdi, Moshrik R.; Mallouh, Saida Ali Abu; Al-Kafawein, Juma'a; Alshaaer, Mazen

doi:10.4236/jwarp.2014.65049

Cited by 12 publications

(5 citation statements)

References 15 publications

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“…It has been suggested that the adsorption properties of AAMs could be utilized in construction materials such as water tanks, pipes, and damns (Alshaaer et al 2012;Yousef et al 2009;Alshaaer et al 2010;Hamaideh et al 2014). Good mechanical properties combined with adsorption capacity could be obtained if zeolitic tuff is used as fine aggregate in AAM binder (Andrejkovicová et al 2016;Huang et al 2012).…”

Section: Preparationmentioning

confidence: 99%

Application of alkali-activated materials for water and wastewater treatment: a review

Luukkonen

Heponiemi

Runtti

et al. 2019

Rev Environ Sci Biotechnol

137

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Alkali-activation (or geopolymer) technology has gained a great deal of interest for its potential applications in water and wastewater treatment during the last decade. Alkali-activated materials can be prepared via a relatively simple and low-energy process, most commonly by treating aluminosilicate precursors with concentrated alkali hydroxide and/or silicate solutions at (near) ambient conditions. The resulting materials are, in general, amorphous, have good physical and chemical stability, ion-exchange properties, and a porous structure. Several of the precursors are industrial by-products or other readily available low-cost materials, which further enhances the environmental and economic feasibility. The application areas of alkali-activated materials in water and wastewater treatment are adsorbents/ion-exchangers, photocatalysts, high-pressure membranes, filter media, anti-microbial materials, pH buffers, carrier media in bioreactors, and solidification/stabilization of water treatment residues. The purpose of this review is to present a comprehensive evaluation of the rapidly growing prospects of alkali-activation technology in water and wastewater treatment.

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Section: Preparationmentioning

confidence: 99%

Application of alkali-activated materials for water and wastewater treatment: a review

Luukkonen

Heponiemi

Runtti

et al. 2019

Rev Environ Sci Biotechnol

137

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“…It is worthwhile to point out that the new hybrid material we propose combines good mechanical properties with the capacity to absorb pollutants, as advocated by several authors in the literature, who have recently advanced for other materials based on geopolymers, the possibility to use them also as non-structural construction materials for water tanks, pipes, and damns [54,55].…”

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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“…However, also materials obtained from a reaction between alumino-silicate precursors and phosphoric acid are sometimes referred to as acid-activated geopolymers [3]. Geopolymers have recently gained interest in several water and wastewater treatment applications such as adsorbents [4][5][6][7][8][9][10][11], membrane material [12], photocatalysts [13,14], functional construction materials [15,16], or substrate for biofilm reactors [17]. In many of the aforementioned applications, the use of geopolymers is based on their ion exchange capacity and porous structure.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the metakaolin geopolymer preparation for maximized ammonium adsorption capacity

et al. 2017

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Geopolymers are functional materials that can be used in various environmental applications such as adsorbents in pollutant removal from wastewaters. Metakaolin geopolymer (MK-GP) has been proven to be especially suitable for ammonium (NH4 +) removal from wastewater. In this research, the optimal reagent and raw material ratios in the preparation of MK-GP in terms of NH4 + adsorption capacity were investigated. The response surface methodology based on the face centered central composite design was used to optimize the levels of three factors: the amounts of hydroxide, silicate, and metakaolin. In addition, the effect of Na or K as the charge-balancing cation was studied. Empirical models were fitted to the experimental data using multiple linear regression. The significance of the models was confirmed by means of analysis of variance. Optimal NH4 + removal efficiency was achieved when the amount of hydroxide and silicate were maximized, the amount of metakaolin was minimized, and Na-based reagents were used. These trends are most likely a result of optimized conversion of metakaolin into MK-GP.

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Synthesis of Geopolymers Using Local Resources for Construction and Water Purification

Cited by 12 publications

References 15 publications

Application of alkali-activated materials for water and wastewater treatment: a review

Application of alkali-activated materials for water and wastewater treatment: a review

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

Optimization of the metakaolin geopolymer preparation for maximized ammonium adsorption capacity

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