Stabilization of cesium in alkali-activated municipal solid waste incineration fly ash and a pyrophyllite-based system

Shiota, Kenji; Nakamura, Takakazu; Takaoka, Masaki; Aminuddin, Siti Fatimah; Oshita, Kazuyuki; Fujimori, Takashi

doi:10.1016/j.chemosphere.2017.08.114

Cited by 22 publications

(6 citation statements)

References 33 publications

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“…The potential use of FA-based geopolymers as immobilization matrices for heavy metals and radionuclides was previously studied by several research groups [6][7][8][9][10][11]. The negatively-charged alumina groups within the alumino-silicate backbone of the geopolymer serve as cation binding sites, facilitating their immobilization.…”

Section: Introductionmentioning

confidence: 99%

“…The negatively-charged alumina groups within the alumino-silicate backbone of the geopolymer serve as cation binding sites, facilitating their immobilization. More recent studies have shown that the formation of crystalline zeolite domains within the amorphous geopolymer matrix further enhances the immobilization of metal cations [9,[11][12][13]. Furthermore, the geopolymeric monolith serves as a strong and durable mechanical support for the desired zeolites, which also facilitates their handling and serves as an additional barrier between the toxic waste and the environment [10,14].…”

Section: Introductionmentioning

confidence: 99%

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Alkali Activation of Fly Ash in the Presence of Sodium Nitrate

Ofer-Rozovsky

Bar-Nes²,

Katz

et al. 2021

Preprint

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The use of fly ash as a precursor for geopolymer has been investigated during the last decades for various applications. The aim of this research was to study the effect of nitrate on the formation and evolution of fly ash-based geopolymers, in order to assess their applicability as waste immobilization matrices. These may be of interest in order to treat waste streams from agricultural runoff and various industries including the nuclear industry. Fly ash was alkali-activated using NaOH solutions of various alkalinities, to which nitrates were added as NaNO3. The samples were cured at 40֯C for different periods and characterized by X-Ray diffractometry, Fourier transform mid-Infrared spectroscopy, scanning electron microscopy (SEM), and compressive strength measurements. The content of neo-formed crystalline phases in fly ash-based geopolymers was found to be lower than in metakaolin-based systems studied previously. The nature of the minerals formed in nitrate-free samples differed from those obtained in corresponding metakaolin-based geopolymers. Nevertheless, the dominant phase formed in the presence of nitrate at sufficiently high alkalinity was nitrate-cancrinite, as reported for metakaolin-based geopolymers, regardless of the type of fly-ash used. Although the presence of nitrates was found to have a promoting effect on the geopolymerization process of metakaolin-based geopolymers, it was found to inhibit the processes in fly-ash-based geopolymers.The formation of crystalline phases in FA-based geopolymers suggests that these materials may be used for immobilizing various hazardous species, while FA-based geopolymers containing the nitrate-cancrinite can be considered as a promising candidate for immobilizing radionuclides from radioactive wastes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Alkali Activation of Fly Ash in the Presence of Sodium Nitrate

Ofer-Rozovsky

Bar-Nes²,

Katz

et al. 2021

Preprint

View full text Add to dashboard Cite

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Section: Introductionmentioning

confidence: 99%

Alkali Activation of Fly Ash in the Presence of Sodium Nitrate

Ofer-Rozovsky

Bar-Nes

Katz

et al. 2021

Waste Biomass Valor

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“…However, the use of biosorbents as sorbents based on dried or native biomass, to remove radiocesium revealed several disadvantages such as low adsorption capacity and stability of biomass in treated media. Therefore, more stable sorption materials based on clay minerals (zeolite, bentonite, montmorillonite) and waste materials (blast furnace slag and coal fly ash) have been recommended (Kurihara, Tsuchida, Takahashi, Kang, & Murakami, 2018;Park, Alessi, & Baek, 2019;Remenárová et al, 2014;Shiota et al, 2017). In the last decade several studies were conducted for the removal of Cs using activated carbon, carbon fibers, charcoal, or biochar-based sorbents (Hamilton et al, 2016;Khandaker et al, 2018;Yamauchi, Yamagishi, Kirikoshi, & Yatagai, 2014).…”

Section: Introductionmentioning

confidence: 99%

Potassium nickel(II) hexacyanoferrate(III)-functionalized biochar for selective separation of radiocesium from liquid wastes

Pipíška

Ballová

Frišták

et al. 2020

Journal of Radiation Research and Applied Sciences

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Biochar is a promising metal-immobilizing material, nevertheless the studies of its modification and application in the removal of radionuclides, especially 137 Cs from contaminated liquids remain rare. This research demonstrated that horticultural waste derived biochar (GWB) produced by slow pyrolysis process could be a suitable Cs adsorbent and also useful support to impregnate the potassium nickel(II) hexacyanoferrate(III) (KNi-HCF). Porous materials combining sorption properties of biochar carrier and KNi-HCF have been prepared using simple and efficient impregnation method. The obtained materials (GWB, KNi-HCF-GWB1, and KNi-HCF-GWB2) have been characterized using N 2 adsorption method, SEM-EDX, and FTIR analysis. Compared to GWB, both KNi-HCF biochars showed improved adsorption properties toward Cs + ions, e.g. rapid kinetics, high Cs adsorption capacities (140 ± 3 μmol g −1 for KNi-HCF-GWB1 and 290 ± 9 μmol g −1 for KNi-HCF-GWB2), and high K d values even in the presence of excess of monovalent (Na + + K + + NH 4 + ) and divalent (Ca 2+ + Mg 2+ + Sr 2+ ) cations. High adsorption capacities could be related to synergistic effects of Cs + ion-exchange with KNi[Fe(CN) 6 ] structure and other mechanisms described for unmodified GWB. Rapid adsorption kinetics and high Cs adsorption capacity indicate the suitability of KNi-HCF biochars to treat large volumes of 137 Cs contaminated liquids.

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Stabilization of cesium in alkali-activated municipal solid waste incineration fly ash and a pyrophyllite-based system

Cited by 22 publications

References 33 publications

Alkali Activation of Fly Ash in the Presence of Sodium Nitrate

Alkali Activation of Fly Ash in the Presence of Sodium Nitrate

Alkali Activation of Fly Ash in the Presence of Sodium Nitrate

Potassium nickel(II) hexacyanoferrate(III)-functionalized biochar for selective separation of radiocesium from liquid wastes

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