scholarly journals In situ ultrasonic monitoring of zeolite A crystallization from coal fly ash

2012 ◽  
Vol 190 (1) ◽  
pp. 38-46 ◽  
Author(s):  
Nicholas M. Musyoka ◽  
Leslie F. Petrik ◽  
Eric Hums ◽  
Hasan Baser ◽  
Wilhelm Schwieger
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Zeolite A ◽  
Ultrasonic Monitoring

scholarly journals Characterization of the Physical, Chemical, and Adsorption Properties of Coal-Fly-Ash–Hydroxyapatite Composites

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 774
Author(s):  
Eleonora Sočo ◽  
Dorota Papciak ◽  
Magdalena M. Michel ◽  
Dariusz Pająk ◽  
Andżelika Domoń ◽  
...  
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Thermal Power ◽  
Synthesis Conditions ◽  
High Calcium ◽  
Ft Ir ◽  
Ir Analysis ◽  
Wet Synthesis

(1) Hydroxyapatite (Hap), which can be obtained by several methods, is known to be a good adsorbent. Coal fly ash (CFA) is a commonly reused byproduct also used in environmental applications as an adsorbent. We sought to answer the following question: Can CFA be included in the method of Hap wet synthesis to produce a composite capable of adsorbing both heavy metals and dyes? (2) High calcium lignite CFA from the thermal power plant in Bełchatów (Poland) was used as the base to prepare CFA–Hap composites. Four types designated CFA–Hap1–4 were synthesized via the wet method of in situ precipitation. The synthesis conditions differed in terms of the calcium reactants used, pH, and temperature. We also investigated the equilibrium adsorption of Cu(II) and rhodamine B (RB) on CFA–Hap1–4. The data were fitted using the Langmuir, Freundlich, and Redlich–Peterson models and validated using R2 and χ2/DoF. Surface changes in CFA–Hap2 following Cu(II) and RB adsorption were assessed using SEM, SE, and FT-IR analysis. (3) The obtained composites contained hydroxyapatite (Ca/P 1.67) and aluminosilicates. The mode of Cu(II) and RB adsorption could be explained by the Redlich–Peterson model. The CFA–Hap2 obtained using CFA, Ca(NO3)2, and (NH4)2HPO4 at RT and pH 11 exhibited the highest maximal adsorption capacity: 73.6 mg Cu/g and 87.0 mg RB/g. (4) The clear advantage of chemisorption over physisorption was indicated by the Cu(II)–CFA–Hap system. The RB molecules present in the form of uncharged lactone were favorably adsorbed even on strongly deprotonated CFA–Hap surfaces.

In-situ ultrasound study of the kinetics of formation of zeolites Na–A and Na–X from coal fly ash

2014 ◽  
Vol 41 (7) ◽  
pp. 4311-4326 ◽  
Author(s):  
Eric Hums ◽  
Nicholas M. Musyoka ◽  
Hasan Baser ◽  
Alexandra Inayat ◽  
Wilhelm Schwieger
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Ultrasound Study ◽  
Kinetics Of Formation ◽  
Kinetics Of

scholarly journals Hybrid Fly Ash-Based Geopolymeric Foams: Microstructural, Thermal and Mechanical Properties

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2919 ◽  
Author(s):  
Giuseppina Roviello ◽  
Laura Ricciotti ◽  
Antonio Jacopo Molino ◽  
Costantino Menna ◽  
Claudio Ferone ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Circular Economy ◽  
Coal Fly Ash ◽  
Silicate Solution ◽  
Thermal And Mechanical Properties ◽  
Blowing Agent ◽  
Materials Used

This research investigates the preparation and characterization of new organic–inorganic geopolymeric foams obtained by simultaneously reacting coal fly ash and an alkali silicate solution with polysiloxane oligomers. Foaming was realized in situ using Si0 as a blowing agent. Samples with density ranging from 0.3 to 0.7 g/cm3 that show good mechanical properties (with compressive strength up to ≈5 MPa for a density of 0.7 g/cm3) along with thermal performances (λ = 0.145 ± 0.001 W/m·K for the foamed sample with density 0.330 g/cm3) comparable to commercial lightweight materials used in the field of thermal insulation were prepared. Since these foams were obtained by valorizing waste byproducts, they could be considered as low environmental impact materials and, hence, with promising perspectives towards the circular economy.

scholarly journals Comparison of CO2 capture by ex-situ accelerated carbonation and in in-situ naturally weathered coal fly ash

2013 ◽  
Vol 127 ◽  
pp. 212-220 ◽  
Author(s):  
Grace N. Muriithi ◽  
Leslie F. Petrik ◽  
Olanrewaju Fatoba ◽  
Wilson M. Gitari ◽  
Frédéric J. Doucet ◽  
...  
Keyword(s):  
Fly Ash ◽  
Co2 Capture ◽  
Coal Fly Ash ◽  
Ex Situ ◽  
Accelerated Carbonation ◽  
Weathered Coal

Adsorption of Chromium in Aqueous Solution by Using Zeolite A Prepared from Fly Ash

2018 ◽  
Vol 792 ◽  
pp. 140-144
Author(s):  
Jumaeri ◽  
Eko Sri Kunarti
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Contact Time ◽  
Direct Contact ◽  
Adsorption Process ◽  
Coal Fly Ash ◽  
Hydrothermal Process ◽  
Zeolite A ◽  
Adsorption Ability ◽  
Ph Conditions

Adsorption of Cr(III) and Cr(VI) in aqueous solution by the zeolite A from coal fly ash at various conditions has been carried out. Zeolite A was synthesized from fly ash through modified alkaline fusion hydrothermal process in a reactor stainless steel. Adsorption is carried out by direct contact between the adsorbent and adsorbate in an adsorption batch. Zeolite A from fly ash (ZA-FA) of 0.01 g was mixed with 20 mL both Cr(III) and Cr(VI) at various pH, contact time and initial concentration, in a flask Erlenmeyer 50 mL. The result showed that pH conditions of adsorption process, affect the adsorption ability of zeolite A to Cr(III) and Cr(VI) in aqueous solution. The adsorption of Cr(III) and Cr(VI) on zeolite A reached a maximum at pH 6 and time contact 120 minutes. The adsorption of Cr(III) on zeolite A increased from 3.4 mg/g at pH 3 and achieved a maximum adsorption of 42.67 mg/g at pH 6. At higher pH (7-8) the Cr(III) adsorption tends decreases. The adsorption ability of ZA-FA to Cr(III) is higher than that of Cr(VI) in aqueous solution. The Cr(III) adsorption process on ZA-FA follows the pseudo-order 2 kinetics model.

In situ ultrasonic diagnostic of zeolite X crystallization with novel (hierarchical) morphology from coal fly ash

Ultrasonics ◽  
2014 ◽  
Vol 54 (2) ◽  
pp. 537-543 ◽  
Author(s):  
Nicholas M. Musyoka ◽  
Leslie F. Petrik ◽  
Eric Hums ◽  
Hasan Baser ◽  
Wilhelm Schwieger
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Zeolite X ◽  
Hierarchical Morphology

scholarly journals Synthesis of zeolite A from coal fly ash using ultrasonic treatment – A replacement for fusion step

2016 ◽  
Vol 31 ◽  
pp. 342-349 ◽  
Author(s):  
Tunde V. Ojumu ◽  
Pieter W. Du Plessis ◽  
Leslie F. Petrik
Keyword(s):  
Fly Ash ◽  
Ultrasonic Treatment ◽  
Coal Fly Ash ◽  
Zeolite A
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