Preparation and Properties of Ceramic Materials from Coal Fly Ash

Kotova, O. B.; Ignatiev, G. V.; Шушков, Д. А.; Harja, Maria; Broekmans, Maarten A. T. M.

doi:10.1007/978-3-030-00925-0_16

Cited by 14 publications

(8 citation statements)

References 10 publications

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“…The ashes from thermo-electrical plants represent the main industrial waste which, due to its chemical composition and physical properties, can be sources of new raw materials that can be used in various fields of environmental protection [7,[39][40][41][42]:…”

Section: Adsorbents For Pollutant Removalmentioning

confidence: 99%

Eco-friendly Nano-adsorbents for Pollutant Removal from Wastewaters

Harja¹,

Ciobanu²

2020

Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications

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Major changes of the environment are caused by the presence of pollutants in air, soil, and wastewaters. From these, a major attention is accorded to the industrial wastewaters, because can contain simultaneous different types of pollutants such as heavy metals, anions, dyes, phenols, pesticides, drugs, etc. For wastewater treatment, consecrated methods such as adsorption, photocatalysis, membrane separation, etc. can be used, adsorption being considered one of the most favorable techniques. In the last years, an increase in interest was observed in nanoadsorbent materials with low cost. Ecofriendly nano-adsorbents include the materials obtained from industrial wastes, agricultural sources, and by-products, recognized as low-cost sources. These nano-adsorbents, obtained by "green technologies," have adsorption capacities, comparable to the expensive adsorbents (modified chitosan, activated carbon, complex inorganic composites, etc.).

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Section: Adsorbents For Pollutant Removalmentioning

confidence: 99%

Eco-friendly Nano-adsorbents for Pollutant Removal from Wastewaters

Harja¹,

Ciobanu²

2020

Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications

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“…Fly ashes could work as precursors for new building materials, this process being a smart route for their convenient recycling, in the meantime with the production of new materials with good durability and high mechanical strength [13,14]. Fly ashes are a major industrial waste, which, due to its chemical composition and hydraulic properties, can be a source of new raw materials useful in various fields, such as concrete fillers, geopolymers, cement substitutes, catalysts, adsorbents, land stabilizers, ceramics, heavy metal removal from wastewaters and zeolites [15][16][17]. The chemical and physical properties of fly ash vary according to the coal source and burning conditions.…”

Section: Introductionmentioning

confidence: 99%

Using Fly Ash Wastes for the Development of New Building Materials with Improved Compressive Strength

et al. 2022

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Fly ash wastes (silica, aluminum and iron-rich materials) could be smartly valorized by their incorporation in concrete formulation, partly replacing the cement. The necessary binding properties can be accomplished by a simple procedure: an alkali activation process, involving partial hydrolysis, followed by gel formation and polycondensation. The correlations between the experimental fly ash processing conditions, particle characteristics (size and morphology) and the compressive strength values of the concrete prepared using this material were investigated by performing a parametric optimization study to deduce the optimal processing set of conditions. The alkali activation procedure included the variation of the NaOH solutions concentration (8–12 M), temperature values (25–65 °C) and the liquid/solid ratio (1–3). The activation led to important modifications of the crystallography of the samples (shown by powder XRD analysis), their morphologies (seen by SEM), particle size distribution and Blaine surface values. The values of the compressive strength of concrete prepared using fly ash derivatives were between 16.8–22.6 MPa. Thus, the processed fly ash qualifies as a proper potential building material, solving disposal-associated problems, as well as saving significant amounts of cement consumed in concrete formulation.

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“…This type of material contains principally SiO 2 and Al 2 O 3 [1], elements that recommend the use of ash in a large spectrum of applications. For example, it is used for zeolite synthesis [2,3], as catalysts [4], in construction as filler or as a precursor for geopolymers [5][6][7], as an adsorbent [8][9][10][11], for ceramics [12,13], etc. Thus, many studies were involved in order to find a solution that would allow its utilization.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Performance of Modified Fly Ash for Copper Ion Removal from Aqueous Solution

Buema

Harja

Lupu

et al. 2021

Water

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The initial characteristics of Romanian fly ash from the CET II Holboca power plant show the feasibility of its application for the production of a new material with applicability in environmental decontamination. The material obtained was characterized using standard techniques: scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), instrumental neutron activation analysis (INAA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), the Brunauer–Emmett–Teller (BET) surface area, and thermogravimetric differential thermal analysis (TG-DTA). The adsorption capacity of the obtained material was evaluated in batch systems with different values of the initial Cu(II) ion concentration, pH, adsorbent dose, and contact time in order to optimize the adsorption process. According to the experimental data presented in this study, the adsorbent synthesized has a high adsorption capacity for copper ions (qmax = 27.32–58.48 mg/g). The alkali treatment of fly ash with NaOH improved the adsorption capacity of the obtained material compared to that of the untreated fly ash. Based on the kinetics results, the adsorption of copper ions onto synthesized material indicated the chemisorption mechanism. Notably, fly ash can be considered an important beginning in obtaining new materials with applicability to wastewater treatment.

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Preparation and Properties of Ceramic Materials from Coal Fly Ash

Cited by 14 publications

References 10 publications

Eco-friendly Nano-adsorbents for Pollutant Removal from Wastewaters

Eco-friendly Nano-adsorbents for Pollutant Removal from Wastewaters

Using Fly Ash Wastes for the Development of New Building Materials with Improved Compressive Strength

Adsorption Performance of Modified Fly Ash for Copper Ion Removal from Aqueous Solution

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