Coal bottom ash processing for capitalization according to circular economy concept

Predeanu, Georgeta; Slăvescu, Valerica; Bălănescu, Mihaela; Mihalache, Romina Dorina; Mihaly, Maria; Marin, Andreea; Meghea, Aurelia; Valentim, Bruno; Guedes, Alexandra; Abagiu, Alexandru Traian; Popescu, Luminiţa; Manea‐Saghin, Ana‐Maria; Vasile, Bogdan Ştefan; Drăgoescu, Marius Florin

doi:10.1016/j.mineng.2021.107055

Cited by 9 publications

(5 citation statements)

References 38 publications

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“…Fly ash, as an adsorbent, is associated with some problems, such as a small surface area (which leads to low adsorption capacities) and low storage [20]. On the other hand, the production of fly ash is an environmental problem; there are on-going efforts to find a use for this waste [27].…”

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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“…The key difference between biological systems and contemporary technologies [89] lies within the energy efficiency of the biological systems that are used for industrial purposes. Converting traditional mining areas into pollution-free areas can be achieved using biotechnologies that allow for remediation [90,91] and economic profit [92] simultaneously from the extraction of useful and/or dangerous substances [93,94]. We must not forget that one of the reasons for the slow development of lithium-based batteries in modern cars is the limited resources of lithium, including the poor technologies employed to recover it from used products and its association with increased brain toxicity.…”

Section: Possible Non-medical Applicationsmentioning

confidence: 99%

Perspectives on Scaffold Designs with Roles in Liver Cell Asymmetry and Medical and Industrial Applications by Using a New Type of Specialized 3D Bioprinter

Harbuz,

Banciu,

David

et al. 2023

IJMS

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Cellular asymmetry is an important element of efficiency in the compartmentalization of intracellular chemical reactions that ensure efficient tissue function. Improving the current 3D printing methods by using cellular asymmetry is essential in producing complex tissues and organs such as the liver. The use of cell spots containing at least two cells and basement membrane-like bio support materials allows cells to be tethered at two points on the basement membrane and with another cell in order to maintain cell asymmetry. Our model is a new type of 3D bioprinter that uses oriented multicellular complexes with cellular asymmetry. This novel approach is necessary to replace the sequential and slow processes of organogenesis with rapid methods of growth and 3D organ printing. The use of the extracellular matrix in the process of bioprinting with cells allows one to preserve the cellular asymmetry in the 3D printing process and thus preserve the compartmentalization of biological processes and metabolic efficiency.

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“…While Winsor I microemulsions have found their applicability, for example, as mobile phases in liquid chromatography [ 53 , 54 ], it is the latter type, Winsor II, that is of particular interest for the removal of contaminants from wastewater in environmental science. In particular, nonionic surfactant and ester-based Winsor II microemulsions have been recently applied successfully for the removal of diverse contaminants from real or simulated wastewater, including heavy metal ions, like cobalt [ 27 , 38 , 55 ], copper [ 27 , 29 , 55 ], nickel [ 39 , 50 , 55 ], chromium [ 55 ], iron, zinc, lead [ 29 ], and a series of lanthanides [ 56 ] as well as organic dyes such as crystal violet [ 27 , 30 , 31 ], methyl orange [ 30 , 31 ], and rhodamine B [ 27 , 30 , 31 ]. Although pharmaceutical drugs are another important class of micropollutants of wastewater and natural water, with severe impacts on both aquatic life and human health, like chronic toxicity, disruptions of the endocrine system, or increase of resistant bacterial strains [ 57 , 58 ], to our knowledge, there are no reports in the literature about the application of microemulsion extraction for the removal of such contaminants of emerging concern.…”

Section: Introductionmentioning

confidence: 99%

Microemulsions of Nonionic Surfactant with Water and Various Homologous Esters: Preparation, Phase Transitions, Physical Property Measurements, and Application for Extraction of Tricyclic Antidepressant Drugs from Aqueous Media

Racovita,

Ciuca,

Catana

et al. 2023

Nanomaterials

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Microemulsions are nanocolloidal systems composed of water, an oil, and a surfactant, sometimes with an additional co-surfactant, which have found a wide range of practical applications, including the extractive removal of contaminants from polluted water. In this study, microemulsion systems, including a nonionic surfactant (Brij 30), water, and esters selected from two homologous series of C1–C6 alkyl acetates and ethyl C1–C4 carboxylates, respectively, were prepared by the surfactant titration method. Phase transitions leading to the formation of Winsor II and Winsor IV microemulsions were observed and phase diagrams were constructed. The dependences of phase transitions on the salinity and pH and the addition of isopropanol as a co-surfactant were also investigated. Some physical properties, namely density, refractive index, electrical conductivity, dynamic viscosity, and particle size, were measured for a selection of Winsor IV microemulsions, providing further insight into some other phase transitions occurring in the monophasic domains of phase diagrams. Finally, Winsor II microemulsions were tested as extraction solvents for the removal of four tricyclic antidepressant drugs from aqueous media. Propyl acetate/Brij 30/H2O microemulsions provided the best extraction yields (>90%), the highest Nernst distribution coefficients (~40–88), and a large volumetric ratio of almost 3 between the recovered purified water and the resulting microemulsion extract. Increasing the ionic strength (salinity) or the pH of the aqueous antidepressant solutions led to an improvement in extraction efficiencies, approaching 100%. These results could be extrapolated to other classes of pharmaceutical contaminants and suggest ester- and nonionic surfactant-based microemulsions are a promising tool for environmental remediation.

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Coal bottom ash processing for capitalization according to circular economy concept

Cited by 9 publications

References 38 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

Perspectives on Scaffold Designs with Roles in Liver Cell Asymmetry and Medical and Industrial Applications by Using a New Type of Specialized 3D Bioprinter

Microemulsions of Nonionic Surfactant with Water and Various Homologous Esters: Preparation, Phase Transitions, Physical Property Measurements, and Application for Extraction of Tricyclic Antidepressant Drugs from Aqueous Media

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