Synthesis of novel zeolites produced from fly ash by hydrothermal treatment in alkaline solution and its evaluation as an adsorbent for heavy metal removal

Kobayashi, Yuhei; Ogata, Fumihiko; Nakamura, Takehiro; Kawasaki, Nana

doi:10.1016/j.jece.2020.103687

Cited by 88 publications

(40 citation statements)

References 28 publications

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“…Finally, specific surface area and pore volume (d 20 Å) of FA48 (47.3 m 2 /g and 10 Å) was 34 and 100 times higher than CFA. Additionally, the value of FA48 (potassium-type zeolite) was greater than that of sodium-type zeolite [32]. Thus, these results indicate that potassium-type zeolite (FA48) can be prepared from coal fly ash by conventional hydrothermal treatment using potassium hydroxide.…”

Section: Properties Of Potassium-type Zeolitementioning

confidence: 78%

“…Additionally, in this study, FA48 was selected to evaluate the adsorption capability for Hg 2+ removal from aqueous solutions. A comparison of the Hg 2+ adsorption capability of FA48 with that of the other adsorbents is listed in Table 2 [24,26,[32][33][34][35]. FA48 exhibited potential in Hg 2+ adsorption from aqueous solutions compared to other reported adsorbents (except for coal gangue and multifunctional mesoporous material).…”

Section: Adsorption Of Hg 2+mentioning

confidence: 99%

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Adsorption/Desorption Capability of Potassium-Type Zeolite Prepared from Coal Fly Ash for Removing of Hg2+

et al. 2021

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The feasibility of using potassium-type zeolite (K-type zeolite) prepared from coal fly ash (CFA) for the removal of Hg2+ from aqueous media and the adsorption/desorption capabilities of various potassium-type zeolites were assessed in this study. Potassium-type zeolite samples were synthesized by hydrothermal treatment of CFA at different intervals (designated CFA, FA1, FA3, FA6, FA12, FA24, and FA48, based on the hours of treatment) using potassium hydroxide solution, and their physicochemical characteristics were evaluated. Additionally, the quantity of Hg2+ adsorbed was in the order CFA, FA1 < FA3 < FA6 < FA12 < FA24 < FA48, in the current experimental design. Therefore, the hydrothermal treatment time is important to enhance the adsorption capability of K-type zeolite. Moreover, the effects of pH, temperature, contact time, and coexistence on the adsorption of Hg2+ were elucidated. In addition, Hg2+ adsorption mechanism using FA48 was demonstrated. Our results indicated that Hg2+ was exchanged with K+ in the interlayer of FA48 (correlation coefficient = 0.946). Finally, adsorbed Hg2+ onto FA48 could be desorbed using a sodium hydroxide solution (desorption percentage was approximately 70%). Our results revealed that FA48 could be a potential adsorbent for the removal of Hg2+ from aqueous media.

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Section: Properties Of Potassium-type Zeolitementioning

confidence: 78%

Section: Adsorption Of Hg 2+mentioning

confidence: 99%

Adsorption/Desorption Capability of Potassium-Type Zeolite Prepared from Coal Fly Ash for Removing of Hg2+

et al. 2021

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“…The specification of fly ash has a significant influence on the range of the specific surface area of zeolites obtained by alkaline-hydrothermal modification. In the literature, there can be found information about zeolites which are characterized by low specific surface area, below 45 m 2 /g (Kobayashi et al, 2020;Koshy and Singh, 2016) and very large, above 250 m 2 /g (Kyzioł-Komosińska et al, 2015;Ojha et al al., al., 2004). Commercial zeolite 13X is characterized by a specific surface area of about 478 m 2 /g.…”

Section: Characteristics Of Zeolite Materialsmentioning

confidence: 99%

“…The possibility of using fly ashes has recently met with increased interest among researchers. Fly ash, which due to its mineral composition could easily be transformed into synthetic zeolites, can be successfully used in heavy metal sorption (Sprynskyy et al, 2006;Koshy, 2016;Bai, 2019;Kobayashi, 2020;Chen, 2020). It fulfils the objectives of sustainable waste management because problematic waste becomes a product that can be used in wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Use of synthetic zeolite materials from fly ash to remove copper(II) ions from aqueous solutions

Ulatowska¹,

Stala²,

Nowakowska³

et al. 2020

Physicochem. Probl. Miner. Process.

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Water quality and waste management are two chief problems that the modern world is struggling with. Intensified development of the industry not only leads to the production of large amounts of solid waste that must be stored in landfills but can also result in contaminant emissions into the environment. Enormous quantities of ash produced from coal combustion have been a long-term problem of the industry. Literature studies show that fly ash can be used as a material to produce cheap and efficient zeolite-type adsorbents due to abundance of alumina-silicates in their composition. Fly ashes which were processed into zeolites as a result of alkaline hydrothermal treatment were obtained from two power plants in Poland (in Turów and Zgierz). The obtained zeolite materials and raw fly ash samples were characterised in terms of specific surface area, particle size distribution and density. The structure was also investigated using Fourier transform infrared spectroscopy (FTIR) in the midinfrared wavenumber range. Two raw fly ashes and two zeolite materials were examined for their ability to remove Cu(II) ions from aqueous solutions. The results showed that the amount of adsorbed copper ions by alkaline-modified fly ash was higher than for unmodified fly ash. The ion removal efficiency is high and exceeds 95%.

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“…Common treatments for industrial effluents include ion exchange [6,7], flotation [8], filtration [9], adsorption [10,11] and coagulation and flocculation [12]. Among these methods, adsorption provides a direct and economical route for removing both organic and inorganic contaminants.…”

Section: Introductionmentioning

confidence: 99%

Thermally grown Zn-doped hematite (α-Fe2O3) nanostructures for efficient adsorption of Cr(VI) and Fenton-assisted degradation of methyl orange

Aquino

Balela

2020

SN Appl. Sci.

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This work presents a facile method of growing zinc-doped α-hematite (Zn-doped α-Fe 2 O 3) nanostructures via thermal oxidation of Fe sheet in the presence of Zn 2+ mist. Both undoped and Zn-doped α-Fe 2 O 3 nanostructures exhibit blade-like morphology mixed with some nanowires. In general, smaller yet denser nanostructures are formed at higher oxidation temperatures. On the other hand, misting (water vapor) enhances the oxidation rate, leading to larger nanoblades. Raman and energy dispersive X-ray spectroscopy reveal the successful incorporation of Zn in the α-Fe 2 O 3 lattice. However, excessive Zn 2+ (0.01 M) promotes the formation of large Zn hydroxide chloride particles on top of the α-Fe 2 O 3 nanoblades. The undoped α-Fe 2 O 3 nanostructures prepared at 650 °C in water vapor effectively adsorb hexavalent chromium [Cr(VI)] in aqueous solution with about 95% removal efficiency. The sample oxidized in 0.005 M Zn 2+ mist is also efficient in the Fenton-assisted photodegradation of methyl orange with > 90% removal even after five degradation cycles.

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Synthesis of novel zeolites produced from fly ash by hydrothermal treatment in alkaline solution and its evaluation as an adsorbent for heavy metal removal

Cited by 88 publications

References 28 publications

Adsorption/Desorption Capability of Potassium-Type Zeolite Prepared from Coal Fly Ash for Removing of Hg2+

Adsorption/Desorption Capability of Potassium-Type Zeolite Prepared from Coal Fly Ash for Removing of Hg2+

Use of synthetic zeolite materials from fly ash to remove copper(II) ions from aqueous solutions

Thermally grown Zn-doped hematite (α-Fe2O3) nanostructures for efficient adsorption of Cr(VI) and Fenton-assisted degradation of methyl orange

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