Hydrothermal synthesis of zeolite production from coal fly ash: A heuristic approach and its optimization for system identification of conversion

Tauanov, Zhandos; Shah, Dhawal; Inglezakis, Vassilis J.; Jamwal, Prashant K.

doi:10.1016/j.jclepro.2018.02.047

Cited by 70 publications

(24 citation statements)

References 37 publications

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“…In the last few years, CFA usage as a cheap source of aluminosilicate has attracted scientists who have shown the successful transformation of this waste material into zeolites [110]. These synthetic fly ashbased zeolites are synthesized by various chemical processes (hydrothermal, alkaline fusion-assisted hydrothermal process, multi-step treatment method, microwave irradiation and sonication approach) resulting in a more uniform and cleaner state than natural types in terms of their lattice structures, pore size, and cages in their aluminosilicate frameworks [111][112][113][114][115][116].…”

Section: Chemical Composition and Loss On Ignition (%)mentioning

confidence: 99%

Solid Green Biodiesel Catalysts Derived from Coal Fly Ash

Stanković¹,

Pavlović²,

Marinković³

et al. 2020

Renewable Energy - Resources, Challenges and Applications

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Coal fly ash (CFA) is generated during the combustion of coal for energy production. Many studies are based on its utilization as the most abundant, cheap aluminosilicate industrial residue, which is recognized as a risk for the environment and human health. The present review is focused on CFA origin, chemical properties, and its catalytic application for biodiesel production. The aluminosilicate nature and the presence of rare earth elements make CFA suitable for different adsorption, catalytic, and extraction processes for obtaining valuable products including alternative fuels and pure elements. However, the presence of toxic elements is a potential environmental problem, which should be solved in order to avoid soil, water, and air pollution. The most used modification methods are alkali activation, hydrothermal, and thermal treatment that improve the structural, morphological, and textural properties. The active catalytic form could be obtained by impregnation or ion exchange method. It was found that such synthesized materials have significant catalytic potential in the biofuel chemistry. In the case of biodiesel production, the high values of conversion or yield can be achieved under mild low-energy reaction conditions in the presence of low-cost waste-based catalysts.

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Section: Chemical Composition and Loss On Ignition (%)mentioning

confidence: 99%

Solid Green Biodiesel Catalysts Derived from Coal Fly Ash

Stanković¹,

Pavlović²,

Marinković³

et al. 2020

Renewable Energy - Resources, Challenges and Applications

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show abstract

“…The reaction time was set at 48 hours to produce synthetic sodalite (SOD) with substantial yield. The synthesis of sodalite underwent a similar protocol as the synthesis of CFA-derived zeolite produced in our previous work [2,30,31] .…”

Section: Materials and Synthesis Proceduresmentioning

confidence: 99%

Synthetic sodalite doped with silver nanoparticles: Characterization and mercury (II) removal from aqueous solutions

Tauanov

Tsakiridis

Shah

et al. 2019

Journal of Environmental Science and Health, Part A

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In this work, a novel silver-doped synthetic sodalitic composite was synthesized and characterized using advanced characterization methods, namely TEM-EDS, XRD, SEM, XRF, BET, zeta potential and particle size analysis. The synthesized nanocomposite was used for the removal of Hg 2+ from 10 ppm aqueous solutions of initial pH equal to 2. The results showed that the sodalitic nanocomposites removed up to 98.65% of Hg 2+ , which is approximately 16% and 70% higher than the removal achieved by sodalite and parent coal fly ash, respectively. The findings revealed that the Hg 2+ retention in nanocomposite microstructure is a multifaceted mechanism that predominantly involves adsorption, precipitation and Hg-Ag amalgamation. The study of the anions effect (Cl-, NO3-, C2H3O2and SO4 2-) indicated that the Hg 2+ uptake is comparatively higher when Clanions co-exist with Hg 2+ in the solution.

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“…At present, CFA is primarily used for concrete production, metal extraction, and zeolite synthesis, however, lower utilization efficiency severely restricts its availability. Chen et al employed efficient utilization of CFA to prepare various zeolites such as NaA, NaX, NaY, NaP, and others . Table summarizes various zeolites synthesized from different CFA, Si/Al, and the disposal methods .…”

Section: Introductionmentioning

confidence: 99%

In‐situ synthesis of NaP zeolite doped with transition metals using fly ash

et al. 2019

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Here, a novel approach has been proposed to synthesize NaP zeolite adsorbents doped with transition metals (M‐NaP) using the Na2SiO3 and NaAlO2 compounds extracted from fly ash via activation and stage treatment. The preparation process of M‐NaP employed the in‐situ synthesis in combination with organic complexation method. The effects of the addition amounts and valence state of transition metals on the zeolite products were investigated. The crystalline phase, morphology, and particle size of M‐NaP were characterized using X‐ray diffractometry (XRD), Scanning electron microscopy (SEM), and Laser particle size analyzer (PSD). The doping process was investigated using X‐ray photoelectron spectroscopy (XPS) and Materials Studio. The adsorption performance of M‐NaP was tested by the adsorption of Zn2+. The optimal molar ratio of n(Al2O3)/n(M) was identified as 8:1 for Co–NaP, Ni–NaP, and Fe–NaP, compared with 6:1 for Ti–NaP. The influence of transition metals on adsorption was: Co–NaP > Ni–NaP > Ti–NaP > Fe‐NaP. Due to largest surface area of Co–NaP (162.5 m2/g, five times than that of NaP‐RAW), the maximum removal rate of Zn2+ was above 99.50% at 25°C. The existence state of transition metals in M‐NaP primarily included: isomorphous substitution and balance of the skeletal charge, with the latter in majority. The simulation of Materials Studio indicates that Si at T4 was first substituted and then, Si at T3 opposite T4 was replaced when the replacement of Si in different sites occurred.

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Hydrothermal synthesis of zeolite production from coal fly ash: A heuristic approach and its optimization for system identification of conversion

Abstract: Highlights: 1. Production of synthetic zeolites derived from coal fly ash 2. Effect of the process parameters on conversion into zeolites 3. Heuristic approach of production optimization 4. Fuzzy modeling as an effective system architecture

Cited by 70 publications

References 37 publications

Solid Green Biodiesel Catalysts Derived from Coal Fly Ash

Solid Green Biodiesel Catalysts Derived from Coal Fly Ash

Synthetic sodalite doped with silver nanoparticles: Characterization and mercury (II) removal from aqueous solutions

In‐situ synthesis of NaP zeolite doped with transition metals using fly ash

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