Comparative studies of carbon capture onto coal fly ash zeolites Na-X and Na–Ca-X

Boycheva, Silviya; Zgureva, Denitza; Lazarova, Hristina; Popova, Margarita

doi:10.1016/j.chemosphere.2020.129505

Cited by 40 publications

(39 citation statements)

References 30 publications

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“…The fly ash produced by coal combustion is a mixture of oxides with negative surface charge. The chemical composition of fly ash produced from different types of coal has been listed in the literature [22,23]. In accordance with ASTM C618, fly ash can be classified into two classes, depending on the sum of SiO 2 , Al 2 O 3 and Fe 2 O 3 [24].…”

Section: Introductionmentioning

confidence: 99%

Removal of Toxic Copper Ion from Aqueous Media by Adsorption on Fly Ash-Derived Zeolites: Kinetic and Equilibrium Studies

2021

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This study investigated the adsorption capacity of one material based on the treatment of fly ash with sodium hydroxide as a novel adsorbent for toxic Cu2+ ion removal from aqueous media. The adsorbent was obtained through direct activation of fly ash with 2M NaOH at 90 °C and 6 h of contact time. The adsorbent was characterized by recognized techniques for solid samples. The influence of adsorption parameters such as adsorbent dose, copper initial concentration and contact time was analyzed in order to establish the best adsorption conditions. The results revealed that the Langmuir model fitted with the copper adsorption data. The maximum copper adsorption capacity was 53.5 mg/g. The adsorption process followed the pseudo-second-order kinetic model. The results indicated that the mechanism of adsorption was chemisorption. The results also showed the copper ion removal efficiencies of the synthesized adsorbents. The proposed procedure is an innovative and economical method, which can be used for toxicity reduction by capitalizing on abundant solid waste and treatment wastewater.

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Section: Introductionmentioning

confidence: 99%

Removal of Toxic Copper Ion from Aqueous Media by Adsorption on Fly Ash-Derived Zeolites: Kinetic and Equilibrium Studies

2021

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“…Recent literature reports the application of FA in construction: as raw material in Portland cement clinker [4] and belite-sulfoaluminate clinkers [5], as pozzolanic addition in cement [6], concrete [6,7], light weight aggregate [6], bricks [8], glass-ceramics [9] etc. Also, other uses are being developed, like adsorbents [6,10], zeolites [11], macro and micro nutrients in agriculture [10]. Nowadays its potential utilization due to the new technologies is much wider in the sense of its green transformation.…”

Section: Introductionmentioning

confidence: 99%

Technical and radiological characterisation of fly ash and bottom ash from thermal power plant

Fidanchevski

Angjusheva

Jovanov

et al. 2021

J Radioanal Nucl Chem

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Huge quantities of fly ash and bottom ash are generated from thermal power plants and it presents great concern for country, mainly due to the environmental effects. In this study, fly ashes and bottom ash were characterized from technical and radiological aspects. Health effect due to the activity of radionuclides 226Ra, 232Th and 40K was estimated via radium equivalent activity (Raeq), external hazards index (Hex), the external absorbed dose rate (D) and annual effective dose rate (EDR). The specific surface area (40.25 m2 g−1), particle density (1.88 g cm−3) and LOI (23.49%) were typical for bottom ash. Siliceous fly ash contained 32% reactive silica. The annual effective dose rate for all ashes is ≤ 0.2 mSv y−1. Both, fly ash and bottom ash present potential secondary raw materials to be used for building purposes as result of their technological and radiological assessment.

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“…The BFA has been extensively characterised by Scanning Electron Microscopy (SEM, LEO 1455VP), Energy Dispersive X-Ray Spectroscopy (EDS, Edax International Ltd.), Fourier Transform Infrared spectrometry (FTIR, Perkin Elmer Spectrum One), X-Ray Diffraction (XRD, Bruker D8) and Particle Size Analysis (PSA, Beckman-Coulter LS230). The nanoporous zeolites were synthesized using a fusionassisted, hydrothermal procedure [16], [17] to increase the solubility of the complex Si and Al species [14] in the BFA reducing the synthesis time whilst simultaneously increasing crystallinity and yield [14], [18] when compared to the conventional hydrothermal method [19].…”

Section: Materials and Methodologymentioning

confidence: 99%

“…The spherical particles or cenospheres are typical of fly ash and can be attributed to their amorphous coating formed as a result of relatively abrupt cooling post-combustion [20]. It has also been observed that the cenospheres present hollow microspheres of aluminosilicate glass shells that possess inclusions of various crystalline phases such as quartz or mullite [16], [21].…”

Section: A Biomass Fly Ash Characterizationmentioning

confidence: 99%

Biomass Combustion Fly Ash-Derived Nanoporous Zeolites for Post-Combustion Carbon Capture

Petrovic

Gorbounov

Lahiri

et al. 2021

2021 IEEE 21st International Conference on Nanotechnology (NANO)

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Achieving negative CO2 emissions via the combustion of sustainable biomass -known as bioenergy with carbon capture and storage -is inherently linked to the coproduction of a significant amount of potentially hazardous waste combustion fly ash. Valorisation of this solid waste stream presents obvious economic, social, and environmental incentives within the context of waste utilisation and environmental protection. However, the origin of the biomass (the regional plantation) used during the combustion, dictates the physicochemical properties of this solid residue, making it suitable for specific applications while rendering it less favourable for others.In this study, a nanoporous zeolite as a CO2 adsorbent has been synthesised from industrial-grade biomass combustion fly ash generated in one of the largest biomass combustion power plants in the UK. The method of nanoporous zeolite synthesis follows a fusion-assisted hydrothermal procedure and the produced nanoporous zeolite has been characterised by X-ray diffraction. The CO2 adsorption investigations were conducted via thermogravimetric analysis to estimate the uptake capacity of the prepared adsorbents. TGA studies suggest that the nanoporous adsorbent, run under 100 mol% CO2 at atmospheric pressure, has an equilibrium capacity of over 0.8 mmolCO2/g at 50 °C. The characterisation results are in good agreement with our CO2 adsorption data, demonstrating the nanoporous structure of our synthesised waste-derived zeolites.

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Comparative studies of carbon capture onto coal fly ash zeolites Na-X and Na–Ca-X

Cited by 40 publications

References 30 publications

Removal of Toxic Copper Ion from Aqueous Media by Adsorption on Fly Ash-Derived Zeolites: Kinetic and Equilibrium Studies

Removal of Toxic Copper Ion from Aqueous Media by Adsorption on Fly Ash-Derived Zeolites: Kinetic and Equilibrium Studies

Technical and radiological characterisation of fly ash and bottom ash from thermal power plant

Biomass Combustion Fly Ash-Derived Nanoporous Zeolites for Post-Combustion Carbon Capture

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