Optimized Production of Coal Fly Ash Derived Synthetic Zeolites for Mercury Removal from Wastewater

Tauanov, Zhandos; Shah, Dhawal; Itskos, Grigorios; Inglezakis, Vassilis J.

doi:10.1088/1757-899x/230/1/012044

Cited by 15 publications

(24 citation statements)

References 29 publications

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“…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%

“…Fly ash-derived porous materials have attracted the interest with recent progress and expanding range of applications, particularly as cost effective and easy-to-process adsorbent for wastewater and gaseous emmisions purification [1][2][3][4][5] . Depending on the reaction conditions, the coal fly ash (CFA) can be converted into useful and stable porous materials, such as zeolites [1,6,7] and sodalites [8,9] .…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Materials and Synthesis Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Sodium hydroxide was selected as an activation agent based on previous experience in synthesis of zeolite [7,14]. The detailed synthesis procedure is explained in our previous work elsewhere [15].…”

Section: Synthesis Of Zeolites and Nanocompositesmentioning

confidence: 99%

“…All adsorption experiments were carried out in duplication without stirring and at room temperature. The detailed description of mercury analysis and experimental conditions are written in our previous work elsewhere [15].…”

Section: Batch Adsorption Kineticsmentioning

confidence: 99%

Silver Nanoparticles Impregnated Zeolites Derived from Coal Fly Ash: Effect of the Silver Loading on Adsorption of Mercury (II)

2018

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Removal of mercury (II) from aqueous phase is of utmost importance, as it is highly toxic and hazardous to the environment and human health. A promising method for the removal of mercury (II) ions from aqueous solutions is by using adsorbents derived from coal fly ash (CFA), such as synthetic zeolites. In this work we present the hydrothermal production of synthetic zeolites from CFA followed by a modification for impregnation of silver nanoparticles, in solid concentrations from 0.15 to 4.71 wt.%. All produced zeolites and parent materials are characterized by XRD, XRF, BET and PSA to obtain morphological and microstructural data. Moreover, mercury (II) ions removal from aqueous solutions with initial concentration of 10 ppm is studied. According to results, zeolites and Ag-nanocomposites demonstrate much higher removal than parent CFA (up to 98%). In addition to this, we could observe a distinct adsorption behavior depending on the loading of Ag NPs in nanocomposites. A possible removal mechanism for both zeolites and Ag-nanocomposites is discussed.

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“…7 In addition to the huge area needed to store or dispose of CFA, 8 this waste includes a significant amount of potentially toxic trace elements (PTE) [9][10][11] which may limit its recycling capability and make CFA spilling or leaching a hazard resulting in contamination of soils, water bodies and groundwater. [12][13][14][15][16] Reutilization processes for CFA waste other than its use in construction include: (i) synthesis of zeolites [17][18][19] , which are microporous crystalline aluminosilicates formed by cornersharing tetrahedral groups conforming voids and channels that allow the adsorption of gases, metal ions and organic molecules. 9,18,[20][21][22] Due to their pore characteristics and high ion exchange capacity, 23 CFA-derived zeolites are employed for CO 2 (and other pollutant gases) capture, removal of toxic metals, water decontamination, and soil improvement.…”

Section: Introductionmentioning

confidence: 99%

CO2 sequestration and simultaneous zeolite production by carbonation of coal fly ash: Impact on the trapping of toxic elements

Monasterio-Guillot

Álvarez‐Lloret²,

Ibáñez-Velasco³

et al. 2020

Journal of CO2 Utilization

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Coal-fired power plants are main contributors to atmospheric CO 2 emissions. They also produce huge amounts of coal fly ash (CFA) waste, which is typically landfilled, posing significant environmental risks due to its high content of potentially toxic elements (PTE). However, CFA is an alkaline aluminosilicate-rich waste, which offers the possibility of CO 2 mineral capture and the production of economically-relevant mineral by-products such as zeolites. Yet, the combined carbonation and zeolite production from CFA resulting in PTE trapping has never been explored. Here we show that under mild hydrothermal conditions (150 °C) and depending of process parameters such as pH and background alkali metal ion in alkaline (bi)carbonate solutions, a carbonation efficiency of up to 79%, with a net CO 2 mineral capture of 0.045 g/kg CFA can be achieved, even when using a low Ca and Mg (3.72 wt% CaO, 1.74 wt% MgO) Class F fly ash. Moreover, amorphous zeolitic precursors and different crystalline zeolites (yield 1 up to 60 wt%) are simultaneously obtained, and PTE in CFA are effectively trapped into the newly formed calcite, zeolitic precursors, and zeolite phases. These results have important implications for carbon capture and storage, as well as for the safe reutilization and disposal of CFA waste.

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Optimized Production of Coal Fly Ash Derived Synthetic Zeolites for Mercury Removal from Wastewater

Cited by 15 publications

References 29 publications

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

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

Silver Nanoparticles Impregnated Zeolites Derived from Coal Fly Ash: Effect of the Silver Loading on Adsorption of Mercury (II)

CO2 sequestration and simultaneous zeolite production by carbonation of coal fly ash: Impact on the trapping of toxic elements

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