A simple thermogravimetric method for the evaluation of the degree of fly ash conversion into zeolite material

Majchrzak‐Kucęba, Izabela

doi:10.1007/s10934-012-9610-1

Cited by 30 publications

(12 citation statements)

References 18 publications

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“…where Z is the yield of the zeolite Na-X phase from the aluminosilicate part of the raw FA, wt.%, S BET,exp and S BET,ref are the BET specific surface areas for FAZ and the referent zeolite Na-X, correspondingly and SiO 2 and Al 2 O 3 are the contents of the corresponding components in the FA composition, wt.%/100. The evaluation of zeolitization extent based on specific surface values is one of the reliable methods applied, as discussed by Majchrzak-Kuceba [40].…”

Section: Coal Fly Ash Zeolitesmentioning

confidence: 99%

Progress in the Utilization of Coal Fly Ash by Conversion to Zeolites with Green Energy Applications

et al. 2020

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Fly ash (FA) from lignite coal combusted in different Thermal Power Plants (TPPs) was used for the synthesis of zeolites (FAZs) of the Na-X type by alkaline activation via three laboratory procedures. FAZs were characterized with respect to their morphology, phase composition and surface properties, which predetermine their suitability for applications as catalysts and adsorbents. FAZs were subsequently modified with metal oxides (CuO) to improve their catalytic properties. The catalytic activity of non-modified and CuO-modified FAZs in the total oxidation of volatile organic compounds was investigated. FAZs were studied for their potential to retain CO2, as their favorable surface characteristics and the presence of iron oxides make them suitable for carbon capture technologies. Thin films of FAZs were deposited by in situ crystallization, and investigated for their morphology and optical sensitivity when exposed to pollutants in the gas phase, e.g., acetone. This study contributes to the development of novel technological solutions for the smart and valuable utilization of FA in the context of the circular economy and green energy production.

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Section: Coal Fly Ash Zeolitesmentioning

confidence: 99%

Progress in the Utilization of Coal Fly Ash by Conversion to Zeolites with Green Energy Applications

et al. 2020

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“…There is no unified approach to estimate the zeolitic yield in the products of FA conversion. In the literature, data from thermogravimetric analyses, water vapor adsorption and release, XRD deconvolution, and SSA comparison have been applied for the estimation of the zeolitization extent [40]. In this study, the SSA of the synthesized samples was used to evaluate the influence of the raw fly ashes properties onto the crystallization of zeolite FAU.…”

Section: Surface Properties Of Coal Fly Ash Zeolitesmentioning

confidence: 99%

Quasi Natural Approach for Crystallization of Zeolites from Different Fly Ashes and Their Application as Adsorbent Media for Malachite Green Removal from Polluted Waters

et al. 2020

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Worldwide disposal of multi-tonnage solid waste from coal-burning thermal power plants (TPPs) creates serious environmental and economic problems, which necessitate the recovery of industrial waste in large quantities and at commercial prices. Fly ashes (FAs) and slag from seven Bulgarian TPPs have been successfully converted into valuable zeolite-like composites with various applications, including as adsorbents for capturing CO2 from gases and for removal of contaminants from water. The starting materials generated from different types of coal are characterized by a wide range of SiO2/Al2O3 ratio, heterogeneous structure and a complex chemical composition. The applied synthesis procedure resembles the formation of natural zeolites, as the raw FAs undergo long-term self-crystallization in an alkaline aqueous solution at ambient temperature. The phase and chemical composition, morphology and N2 adsorption of the final zeolite products were studied by scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), X-Ray Diffraction (XRD) and Brunauer–Emmett–Teller (BET) analyses. The growth of faujasite (FAU) crystals as the main zeolite phase was established in all samples after 7 and 14 months of alkaline treatment. Phillipsite (PHI) crystals were also observed in several samples as an accompanying phase. The final products possess specific surface area over 400 m2/g. The relationships between the surface properties of the investigated samples and the characteristics of the raw FAs were discussed. All of the obtained zeolite-like composites were able to remove the highly toxic dye (malachite green, MG) from water solutions with efficiency over 96%. The experimental data were fitted with high correlation to the second-order kinetics.

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“…Zeolites could often be hydrated at non-elevated temperatures, and water molecules and other volatiles could often be found on the surface and in the cavities. The adsorbed water content reflects the free volume in the zeolite cavities which could be accessible to adsorbates (Usachev et al 2003;Majchrzak-Kuceba 2013). Therefore, the quantification of desorbed volatiles from an adsorbent of zeolitic nature could be used as a measure of porosity, especially when a comparison is involved.…”

Section: Moisture and Ash Contentmentioning

confidence: 99%

Microwave and fusion techniques for the synthesis of mesoporous zeolitic composite adsorbents from bagasse fly ash: sorption of p-nitroaniline and nitrobenzene

Oluyinka

Patel²,

Shah

et al. 2020

Appl Water Sci

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Abstractp-Nitroaniline (PNAN) and nitrobenzene (NB) being important raw materials and intermediates for the production of a wide range of chemical products have the potential of constituting water pollutants. Hence, the development of the means of removing these chemicals from water would go a long way to safeguard the health of the environment. The goal of this research was to transform bagasse fly ash (BFA), solid waste from the sugar industry into porous zeolitic adsorbents MgFZBFA and MgMZBFA and examine them for their adsorptive removal of PNAN and NB from aqueous solutions. The syntheses of the sorbents involve alkali fusion technique and microwave hydrothermal treatment for the desired properties. Advanced characterization techniques such as FTIR (Fourier transform infrared spectroscopy), XRF (X-ray fluorescence spectroscopy), XRD (X-ray diffraction spectroscopy), SEM (scanning electron microscopy), Brunauer–Emmett–Teller (BET)/Barrett–Joyner–Halenda (BJH) Method, and TGA (thermogravimetric analysis) were used for the characterization and evaluation of the sorbents’ properties. The adsorptive removal of PNAN and NB from aqueous solutions by MgFZBFA and MgMZBFA were investigated. Various parameters such as pH, adsorbent dosage, initial sorbate concentration were optimized during the adsorption experiment to achieve best performance. Adsorption isotherm, kinetics and dynamics were studied. It was found that Langmuir adsorption isotherm model better represents the adsorption processes and that the processes follow pseudo-second-order kinetics. More so, the sorption processes were most possibly completed by both surface sorption (liquid-film diffusion) and intra-particle diffusion. The maximum sorption capacities observed with MgFZBFA for PNAN and NB are 30.86 mg g−1 and 19.92 mg g−1, while with MgMZBFA the values are 12.72 mg g−1 and 10.20 mg g−1, respectively. The performances of MgFZBFA and MgMZBFA for the sorption of PNAN and NB were compared with some adsorbents previously studied for the same purpose, and results show that the adsorbents in the present study exhibit better performances. The application as materials of cheap source for the removal of PNAN and NB from contaminated water could be considered.

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A simple thermogravimetric method for the evaluation of the degree of fly ash conversion into zeolite material

Cited by 30 publications

References 18 publications

Progress in the Utilization of Coal Fly Ash by Conversion to Zeolites with Green Energy Applications

Progress in the Utilization of Coal Fly Ash by Conversion to Zeolites with Green Energy Applications

Quasi Natural Approach for Crystallization of Zeolites from Different Fly Ashes and Their Application as Adsorbent Media for Malachite Green Removal from Polluted Waters

Microwave and fusion techniques for the synthesis of mesoporous zeolitic composite adsorbents from bagasse fly ash: sorption of p-nitroaniline and nitrobenzene

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