CTAB modified large surface area nanoporous geopolymer with high adsorption capacity for copper ion removal

Singhal, Aditi; Gangwar, Bhanu P.; Gayathry, J.M.

doi:10.1016/j.clay.2017.09.013

Cited by 76 publications

(29 citation statements)

References 38 publications

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“…On the other hand, the average pore size of CG/KGP samples were mainly belonging to mesopores, which increased from 36.36 to 52.00 nm with the increasing of calcined temperature. A number of previous studies showed the BET surface area of the geopolymer materials was ~50 m 2 /g, which was in agreement with results in the present work. Porous geopolymer obtained by Naghsh et al showed that the BET surface area and total pore volume were 51.3 m 2 g −1 and 0.324 cm 3 g −1 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of novel low‐cost porous gangue microsphere/geopolymer composites and their adsorption properties for dyes

Yan

Jia

et al. 2018

Int J Applied Ceramic Tech

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A novel porous coal gangue microsphere/geopolymer (CG/KGP) composite was firstly synthesized by adding gangue microspheres into geopolymer matrix. Effects of precalcined temperature of CG microspheres on the microstructure and specific surface area of the porous CG/KGP particles were systematically investigated. Adsorption properties of the CG/KGP composites were also reported. Results showed that the CG/KGP composites contained mainly amorphous phase and many functional groups were on the particle surface. The precalcined CG microspheres were dispersed homogenously and bonded well with the KGP matrix. The CG900/KGP samples showed better adsorption properties than the pure KGP. As for the dosage of 4 g/L (starting concentration, 100 mg/L), adsorption capacity achieved the highest value of 24.6 mg/g and the removal efficiency reached 98%. Adsorption of MB onto CG900/KGP particles followed the pseudo‐second‐order kinetic model. The novel porous CG/KGP composite has potential application in wastewater filtration and adsorption treatment.

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Section: Resultsmentioning

confidence: 99%

Synthesis of novel low‐cost porous gangue microsphere/geopolymer composites and their adsorption properties for dyes

Yan

Jia

et al. 2018

Int J Applied Ceramic Tech

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“…Specific surface areas of the direct-foamed samples (≈22-37 m 2 /g) were in good agreement with earlier studies (≈17-22 m 2 /g) 9,30 , which indicates that the surfactants used did not clog the nanoscale pores. Singhal et al reported that the addition of CTAB to metakaolin and fumed silica-based geopolymers resulted in a substantial increase in surface area (from 137 to 216 m 2 /g) and suggested that CTAB could act as structure-directing agent during synthesis 31 . Nevertheless, in the present study, no improvement on surface area was observed as a result of using CTAB.…”

Section: Resultsmentioning

confidence: 99%

Ag- or Cu-modified geopolymer filters for water treatment manufactured by 3D printing, direct foaming, or granulation

Luukkonen

Sreenivasan

Ohenoja

et al. 2020

Sci Rep

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In this work, we compared the main characteristics of highly porous geopolymer components for water treatment applications manufactured by 3D printing, direct foaming, or granulation. Furthermore, different approaches to impregnate the materials with Ag or Cu were evaluated to obtain filters with disinfecting or catalytic properties. The results revealed that all of the investigated manufacturing methods enabled the fabrication of components that possessed mesoporosity, suitable mechanical strength, and water permeability, even though their morphologies were completely different. Total porosity and compressive strength values were 28 vol% and 16 MPa for 3D-printed, 70-79 vol% and 1 MPa for direct-foamed, and 27 vol% and 10 MPa for granule samples. Both the filter preparation and the metal impregnation method affected the amount, oxidation state, and stability of Ag and Cu in the filters. However, it was possible to prepare filters with low metal leaching between a pH of 3-7, so that the released Ag and Cu concentrations were within drinking water standards. Cellular ceramics have a high potential in water treatment applications, such as Ag impregnated point-of-use disinfecting filters 1 , slurry dewatering systems 2 , catalyst supports 3 , and micro-or ultrafiltration membranes 4. However, although ceramic materials have good chemical and physical stability, their higher price in comparison to organic polymers has hindered more widespread use in industrial water treatment 5,6. Geopolymers, on the other hand, are amorphous, low-calcium, aluminosilicate, ceramic-like materials with structural mesoporosity (i.e., pore diameter 2-50 nm) 7 ; good mechanical and chemical stability 8 ; and cation-exchange capacity 9. However, in contrast to conventional ceramics, geopolymers consolidate at (near) ambient conditions without high-temperature sintering. Consequently, geopolymer technology could offer a possibility for clean and low-cost production of ceramic-like filters, possessing better chemical stability, and a longer lifespan than polymeric components. In the context of water and wastewater treatment, geopolymers have already been investigated for a number of applications, such as adsorbents/ion exchangers, photocatalysts, and membranes, as summarized by Luukkonen et al. 10. Some of the outlined uses require modification of the geopolymers with metals. The proof-of-concept study for the use of geopolymers as antimicrobial materials was performed by O'Connor et al., who prepared an Ag +-exchanged, halloysite-based geopolymer and applied it successfully to inactivate Staphylococcus aureus on an agar plate 11. Metakaolin or fly ash geopolymers have also been modified with Ag-nanoparticles (AgNPs), and the resulting antimicrobial materials have been proposed to be used in construction 12,13. Furthermore, Cu 2+-exchanged metakaolin geopolymers have proved to be a promising antimicrobial material to be used against oyster mushroom hyphae 14. In (photo)catalytic water treatment applications, the successful impregnation of ca...

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“…However, specific surface areas up to 114 m 2 /g have been reported (Lee et al 2016a). With an addition of surfactant, the specific surface area can be further increased: for instance, from 137 to 216 m 2 /g by using cetyl trimethylammonium bromide (Singhal et al 2017). AAMs are usually mesoporous (i.e., pore size 2-50 nm), but also micro (\ 2 nm) and macro pores ([ 50 nm) are present (Bortnovsky et al 2008;Luukkonen et al 2016b).…”

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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CTAB modified large surface area nanoporous geopolymer with high adsorption capacity for copper ion removal

Cited by 76 publications

References 38 publications

Synthesis of novel low‐cost porous gangue microsphere/geopolymer composites and their adsorption properties for dyes

Synthesis of novel low‐cost porous gangue microsphere/geopolymer composites and their adsorption properties for dyes

Ag- or Cu-modified geopolymer filters for water treatment manufactured by 3D printing, direct foaming, or granulation

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

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