Performance assessment of five adsorbents based on fly ash for removal of cadmium ions

Buema, Gabriela; Lupu, Nicoleta; Chiriac, H.; Ciobanu, Gabriela; Bucur, Roxana-Dana; Bucur, Daniel; Favier, Lidia; Harja, Maria

doi:10.1016/j.molliq.2021.115932

Cited by 45 publications

(18 citation statements)

References 64 publications

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“…The experimental procedure consisted of mixing the fly ash with the alkali solutions and stirring for 4 h, at either 25 or 65 • C. The solid was subsequently filtered, washed and dried. The structural investigation of the initial solid revealed that it was a class F fly ash (Fe-rich clay), the same as we found in some previous studies [13,25]. The solid-to-liquid ratios optimization meant choosing the minimum necessary alkali solution for the thorough wetting of the ash and the proper feedstock transformation, with a minimum amount of solution.…”

Section: Materials Synthesissupporting

confidence: 63%

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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Section: Materials Synthesissupporting

confidence: 63%

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

et al. 2022

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“…Adsorption can be explained as a separation process in which the components of a fluid phase are transferred to the surface of a solid material [4,5]. The adsorption process is the most used technique due to its efficiency and simplicity [6][7][8]. Several adsorbents have been tested in order to remove copper ion, such as activated carbon [8][9][10], clays [11], apatite [12], composite carbon-silica [13], magnetic materials [14][15][16], silica gel [17], hydroxyapatite [18], zeolites [19] and fly ash [5,20].…”

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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“… 17 Adsorption is however considered a promising and effective purification technique for heavy metal ions due to its simplicity, low cost, and high efficiency. 18 …”

Section: Introductionmentioning

confidence: 99%

Kinetics, thermodynamics, equilibrium, surface modelling, and atomic absorption analysis of selective Cu(ii) removal from aqueous solutions and rivers water using silica-2-(pyridin-2-ylmethoxy)ethan-1-ol hybrid material

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Performance assessment of five adsorbents based on fly ash for removal of cadmium ions

Cited by 45 publications

References 64 publications

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

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

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

Kinetics, thermodynamics, equilibrium, surface modelling, and atomic absorption analysis of selective Cu(ii) removal from aqueous solutions and rivers water using silica-2-(pyridin-2-ylmethoxy)ethan-1-ol hybrid material

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