Synthesis of faujasite (FAU) and tschernichite (LTA) type zeolites as a potential direction of the development of lime Class C fly ash

Kunecki, Piotr; Panek, Rafał; Wdowin, Magdalena; Franus, Wojciech

doi:10.1016/j.minpro.2017.07.007

Cited by 52 publications

(29 citation statements)

References 28 publications

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“…Specific surface areas and pore size properties of the synthesized zeolites were determined by an N 2 adsorption-desorption analyzer (NOVA, Quantachrome Instruments, Boynton Beach, FL, USA). Samples were outgassed using nitrogen (99.99%) for 3 h at 350 • C. The adsorption/desorption data were treated using standard multi-point Brunauer-Emmett-Teller (BET), Dubinin-Radushkevich (DR) and Barrett-Joyner-Halenda (BJH) models [27,43].…”

Section: Characterization Of the Synthesized Zeolitesmentioning

confidence: 99%

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Synthesis of Hydroxy-Sodalite/Cancrinite Zeolites from Calcite-Bearing Kaolin for the Removal of Heavy Metal Ions in Aqueous Media

et al. 2019

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A hydroxy-sodalite/cancrinite zeolite composite was synthesized from low-grade calcite-bearing kaolin by hydrothermal alkali-activation method at 160 • C for 6 h. The effect of calcite addition on the formation of the hydroxy-sodalite/cancrinite composite was investigated using artificial mixtures. The chemical composition and crystal morphology of the synthesized zeolite composite were characterized by X-ray powder diffraction, infrared spectroscopy, scanning electron microscopy, and N 2 adsorption/desorption analyses. The average specific surface area is around 17-20 m 2 ·g −1 , whereas the average pore size lies in the mesoporous range (19-21 nm). The synthesized zeolite composite was used as an adsorbent for the removal of heavy metals in aqueous solutions. Batch experiments were employed to study the influence of adsorbent dosage on heavy metal removal efficiency. Results demonstrate the effective removal of significant quantities of Cu, Pb, Ni, and Zn from aqueous media. A comparative study of synthesized hydroxy-sodalite and hydroxy-sodalite/cancrinite composites revealed the latter was 16-24% more efficient at removing heavy metals from water. The order of metal uptake efficiency for these zeolites was determined to be Pb > Cu > Zn > Ni. These results indicate that zeolite composites synthesized from natural calcite-bearing kaolin materials could represent effective and low-cost adsorbents for heavy metal removal using water treatment devices in regions of water shortage.

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Section: Characterization Of the Synthesized Zeolitesmentioning

confidence: 99%

“…Among these parameters, the alkalinity is known to be a key factor that determines the type of synthesized zeolite [24]. In addition to kaolinite/metakaolinite materials, industrial waste such as coal fly ash has also been used to produce Na-A, Na-X, and Na-P1 zeolites [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Hydroxy-Sodalite/Cancrinite Zeolites from Calcite-Bearing Kaolin for the Removal of Heavy Metal Ions in Aqueous Media

et al. 2019

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“…With the further increase of NaOH/fly ash ratio, the extra NaOH reacted with soluble silicate and aluminate salts which resulted in the formation of hydroxysodalite during both alkali fusion and hydrothermal treatment processes. Because of the larger pore size and specific surface area of zeolite X than hydroxysodalite, products rich in zeolite X have a better performance in cation exchange capacity test [11,13] …”

Section: Adsorption Experimentsmentioning

confidence: 99%

“…Molina et al [12] reported a further improvement of the cation exchange capacities of synthetic zeolite from coal fly ash by introducing an alkali fusion stage prior to the conventional zeolite synthesis process. The synthesis and character of different type zeolites from coal fly ash under various operation conditions were studied by Kunecki et al [13]. Wdowin et al [14] and Querol et al [15] reported the synthesis of zeolite from coal fly ash at sub-pilot and pilot scales.…”

Section: Introductionmentioning

confidence: 99%

Zeolite Synthesized from Coal Fly Ash Produced by a Gasification Process for Ni2+ Removal from Water

et al. 2018

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There are increasing demands and great potential of coal gasification in China, but there is a lack of studies focused on the disposal and utilization of coal fly ash produced by the gasification process. In this study, a coal fly ash sample derived from a gasifier in Jincheng, China, was utilized as raw material for the synthesis of zeolite by alkali fusion followed by hydrothermal treatments. The effects of operation conditions on the cation exchange capacity (CEC) of synthesized zeolite were investigated. The synthesized zeolite with the highest CEC (270.4 meq/100 g), with abundant zeolite X and small amount of zeolite A, was produced by 1.5 h alkali fusion under 550 • C with NaOH/coal fly ash ratio 1.2 g/g followed by 15 h hydrothermal treatment under 90 • C with liquid/solid ratio 5 mL/g and applied in Ni 2+ removal from water. The removal rate and the adsorption capacity of Ni 2+ from water by the synthesized zeolite were determined at the different pH, contact time, adsorbent dose and initial Ni 2+ concentration. The experimental data of adsorption were interpreted in terms of Freundlich and Langmuir equations. The adsorption of Ni 2+ by the synthesized zeolite was found to fit sufficient using the Langmuir isotherm. More than 90% of Ni 2+ in water could be removed by synthesized zeolite under the proper conditions. We show that the coal fly ash produced by the gasification process has great potential to be used as an alternative and cheap source in the production of adsorbents.

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“…A large number of variables can affect the synthetic zeolites crystallinity and phases' purity, i. e., synthesis procedure, SiO 2 /Al 2 O 3 molar ratio, synthesis solution alkalinity (H 2 O/Na 2 O) and water content (H 2 O/Al 2 O 3 ), synthesis temperature (T R ,°C) and time (t R , h), aging time (t A , h), template (if any) and seeding [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Preparation of 13X zeolite powder and membrane: investigation of synthesis parameters impacts using experimental design

Pourazar¹,

Mohammadi²,

Nasr³

et al. 2020

Mater. Res. Express

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The Plackett-Burman method was used to identify and rank most affective parameters on hydrothermal synthesis and properties of the 13X zeolite powder with gel composition of Al 2 O 3 :aSiO 2 :bNa 2 O:cH 2 O. The affective parameters of SiO 2 /Al 2 O 3 ratio, synthesis mixture alkalinity, synthesis temperature, and water content were selected for further study of their impacts and gel composition optimization using the Taguchi method. The synthesized powders were characterized by XRD and SEM analysis. Synthesis temperature and mixture alkalinity were found as the most affecting parameters on the 13X zeolite synthesis at the best gel composition of Al 2 O 3 :5.4SiO 2 : 13Na 2 O: 840H 2 O. Then 13X zeolite membranes were synthesized on the seeded supports using the optimum gel composition and impacts of synthesis temperature and time and coating layer number on their H 2 and CO 2 permeances and ideal H 2 /CO 2 selectivity were studied. The optimum 13X zeolite membrane for H 2 /CO 2 separation was obtained by three layer coatings at 80°C for 16 h with H 2 permeance of 2.88 cm 3 cm −2 .Pa.s and ideal H 2 /CO 2 selectivity of 4.72.

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Synthesis of faujasite (FAU) and tschernichite (LTA) type zeolites as a potential direction of the development of lime Class C fly ash

Cited by 52 publications

References 28 publications

Synthesis of Hydroxy-Sodalite/Cancrinite Zeolites from Calcite-Bearing Kaolin for the Removal of Heavy Metal Ions in Aqueous Media

Synthesis of Hydroxy-Sodalite/Cancrinite Zeolites from Calcite-Bearing Kaolin for the Removal of Heavy Metal Ions in Aqueous Media

Zeolite Synthesized from Coal Fly Ash Produced by a Gasification Process for Ni2+ Removal from Water

Preparation of 13X zeolite powder and membrane: investigation of synthesis parameters impacts using experimental design

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