The crystallisation of zeolite (X- and A-type) from fly ash at 25°C in artificial sea water

Belviso, Claudia; Cavalcante, Francesco; Huertas, F. Javier; Lettino, Antonio; Ragone, Pietro; Fiore, Saverio

doi:10.1016/j.micromeso.2012.06.028

Cited by 61 publications

(46 citation statements)

References 35 publications

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“…In the last decade, fly ash was used as raw materials for obtaining zeolites X (FAU framework type) [8,9], Y (FAU) [10], A (LTA) [8,9,11] or ZSM-5 (MFI) [12]. Furthermore, the synthesis of mesoporous silica from fly ash has also attracted interest due to the resulting material characteristics [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Fly Ash, from Recycling to Potential Raw Material for Mesoporous Silica Synthesis

Miricioiu

Niculescu

2020

Nanomaterials

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In order to meet the increasing energy demand and to decrease the dependency on coal, environmentally friendly methods for fly ash utilization are required. In this respect, the priority is to identify the fly ash properties and to consider its potential as raw material in the obtaining of high-value materials. The physico-chemical and structural characteristics of the fly ash coming from various worldwide power plants are briefly presented. The fly ash was sampled from power plants where the combustion of lignite and hard coal in pulverized-fuel boilers (PC) and circulating fluidized bed (CFB) boilers was applied. The fly ash has high silica content. Due to this, the fly ash can be considered a potential raw material for the synthesis of nanoporous materials, such as zeolites or mesoporous silica. The samples with the highest content of SiO2 can be used to obtain mesoporous silica materials, such as MCM-41 or SBA-15. The resulting mesoporous silica can be used for removing/capture of CO2 from emissions or for wastewater treatment. The synthesis of various porous materials using wastes would allow a high level of recycling for a sustainable society with low environmental impact.

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Section: Introductionmentioning

confidence: 99%

Fly Ash, from Recycling to Potential Raw Material for Mesoporous Silica Synthesis

Miricioiu

Niculescu

2020

Nanomaterials

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“…Due to the abundant presence of amorphous aluminosilicate glass fly ash has also been used in the synthesis of zeolites [12][13][14][15][16]. Zeolites are crystalline hydrated aluminosilicates characterised by a three-dimensional network of tetrahedral (Si,Al)O 4 units that form a system of interconnected pores, which makes these minerals very useful in many applications [17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…The two samples of fly ash were chosen based on the strong differences in their chemical composition regarding both major and trace elements. The samples of zeolitic fly ash that were used were obtained at two temperatures (25°C and 60°C) -in accordance with the results obtained in previous experiments [12,13,15] -with the goal of investigating on the role of zeolitised fly ash on the mobility of some trace elements.…”

Section: Introductionmentioning

confidence: 99%

Mobility of trace elements in fly ash and in zeolitised coal fly ash

Belviso

Cavalcante

Gennaro³

et al. 2015

Fuel

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“…These elements are the main constituents of the basic structure of zeolites, which are tetrahedral aluminosilicates with extensive industrial applications, especially in catalysis and as additives in detergents. 6,[10][11][12][13][14][15] Holler and Wirsching 16 performed the first study on the conversion of coal fly ash into zeolites; since then, numerous publications and patents have been reported, 1,6,13,14,[17][18][19] including reviews. 20,21 In this scenario, other wastes have also been studied as alternative sources of Si and Al to obtain zeolites.…”

Section: Introductionmentioning

confidence: 99%

“…22,23 Conventional zeolite synthesis methods using coal fly ash involve hydrothermal dissolution of the Si and Al source in alkaline solution, as well as the nucleation and growth of crystals. 12,15,17 Despite the large number of studies on fly ash conversion into zeolites, few report on the efficiency of the proposed processes from an economic or ecological perspective. Cardoso et al 13 optimized an integrated method of zeolite Na-P1 and 4A synthesis, referred to here as process B.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Sustainability of Integrated Hydrothermal Synthesis of Zeolites Obtained from Waste

Ferrarini¹,

Cardoso²,

Alban³

et al. 2018

J. Braz. Chem. Soc.

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The high Si and Al contents in the amorphous phase of coal fly ash have been used for its conversion into zeolites. This process converts a toxic low-value by-product into a product used in a number of environmental applications, but has the disadvantage of introducing contaminants. Despite the large number of studies on the conversion of fly ash into zeolites, few report this drawback or discuss the efficiency of the proposed processes from a technical or ecological perspective. In this respect, the present study conducts a detailed assessment of two routes for integrated hydrothermal synthesis of zeolites 4A and Na-P1 obtained from coal fly ash. The processes are evaluated and compared in relation to the presence of undesirable metals and elements in the different steps of synthesis, as well as the feedstock and final product. Different performance parameters are presented and applied in the assessment of both processes and the most sustainable is recommended.

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The crystallisation of zeolite (X- and A-type) from fly ash at 25°C in artificial sea water

Cited by 61 publications

References 35 publications

Fly Ash, from Recycling to Potential Raw Material for Mesoporous Silica Synthesis

Fly Ash, from Recycling to Potential Raw Material for Mesoporous Silica Synthesis

Mobility of trace elements in fly ash and in zeolitised coal fly ash

Evaluation of the Sustainability of Integrated Hydrothermal Synthesis of Zeolites Obtained from Waste

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