PEG-assisted controlled precipitation of calcium hydroxide and calcium carbonate nanostructures for cement reinforcement

Hasanova, I.; Hasanova, Ulviyya; Gasimov, Eldar; Rzayev, Fuad; Hajiyev, É. Sh.; Eyvazova, Goncha M.; Shaliyev, Meherrem; Mehdiyeva, Aytaj; Aliyeva, Nushaba; Yusifov, Yusif; Ismayilov, Hikmat; Akhundzada, Haji Vahid; Aghamaliyev, Z. A.; Hajiyeva, S.R.; Huseynova, Pervane

doi:10.1016/j.matchemphys.2021.124865

Cited by 14 publications

(8 citation statements)

References 37 publications

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“…Further, the easy synthesis of calcium hydroxide by simple chemical methods with varying synthesis conditions makes it even more appealing to work on this material. Calcium hydroxide is extensively used in several applications e. g., Portland cement production, [1,2] cultural heritage conservations, [3,4] and vaterite blocks fabrication, [5] which is important for advanced bio applications. Similarly, a very important emerging area of research is its utilization for nano‐priming action on seed embryos e. g., Indian Gram seeds [6] .…”

Section: Introductionmentioning

confidence: 99%

“…There is a singular report on the usage of Ag‐doped calcium hydroxide for MB dye removal from wastewater [16] . The aforesaid literature survey clearly points out that the systematic studies on how a change of molarity of chemical reactants in the chemical precipitation process of calcium hydroxide affects the physical and especially, the wastewater treatment efficacy are far from well‐studied [1–21] . This gap of information in literature creates the scope of this study.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Molarity on Methylene Blue Dye Removal Efficacy of Nano Ca(OH)₂

et al. 2022

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With the increase in demand of textiles products, the polluted groundwater problem in the world is increasing proportionally and leading to environmental and health problems. Hence in this present work, we report on the dye removal efficacy of nano Ca(OH) 2 by changing the molarity of the reactants. In the process, the chemical precipitation technique is used to synthesize the phase pure nano Ca(OH) 2 powders using equimolar concentrations (e. g., 0.4 M, 0.6 M, 0.8 M and 1 M) of [Ca(NO 3 ) 2 ⋅ 4H 2 O] and NaOH solutions. The prepared material was characterized using XRD, FTIR, and UV-Vis spectroscopy. The results from the characterization study show, that the dye removal behaviour is complex and is sensitive to a simultaneous combination of many factors e. g., the molarities of the reactants, the resultant nanocrystallite size, band gap energy, the concentration of the dye and, the temperature of adsorption. Therefore, these results are discussed in terms of relative variations in the microstructure, lattice strain, band gap energy, defect structure, and the amount of (OH À ) ions. Further, the probable mechanism of dye removal behaviour is suggested. Finally, the consequences of these results in terms of microstructurally tuned nano Ca(OH) 2 materials development for prospective futuristic applications are highlighted.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Molarity on Methylene Blue Dye Removal Efficacy of Nano Ca(OH)₂

et al. 2022

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“…After all retention periods, remaining solutions were drained, collected, and frozen and bio-cemented soils were rinsed twice with absolute ethanol to remove soluble reaction byproducts and then oven-dried at 110 °C for 48 h. After drying, all bio-cemented soil specimens were stored in a vacuum desiccator at room temperature and a relative humidity of less than 10% and were stored for no more than 2 weeks before completing material analyses intended to mitigate the potential for subsequent mineralogical changes. Similar mineral preservation processes have been used successfully in other past studies involving CaCO 3 minerals 72 , 73 .…”

Section: Methodsmentioning

confidence: 88%

Mineralogy, morphology, and reaction kinetics of ureolytic bio-cementation in the presence of seawater ions and varying soil materials

Burdalski

Ribeiro

Gomez

et al. 2022

Sci Rep

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Microbially-induced calcium carbonate precipitation (MICP) is a bio-cementation process that can improve the engineering properties of granular soils through the precipitation of calcium carbonate (CaCO3) minerals on soil particle surfaces and contacts. The technology has advanced rapidly as an environmentally conscious soil improvement method, however, our understanding of the effect of changes in field-representative environmental conditions on the physical and chemical properties of resulting precipitates has remained limited. An improved understanding of the effect of subsurface geochemical and soil conditions on process reaction kinetics and the morphology and mineralogy of bio-cementation may be critical towards enabling successful field-scale deployment of the technology and improving our understanding of the long-term chemical permanence of bio-cemented soils in different environments. In this study, thirty-five batch experiments were performed to specifically investigate the influence of seawater ions and varying soil materials on the mineralogy, morphology, and reaction kinetics of ureolytic bio-cementation. During experiments, differences in reaction kinetics were quantified to identify conditions inhibiting CaCO3 precipitation and ureolysis. Following experiments, scanning electron microscopy, x-ray diffraction, and chemical composition analyses were employed to quantify differences in mineralogical compositions and material morphology. Ions present in seawater and variations in soil materials were shown to significantly influence ureolytic activity and precipitate mineralogy and morphology, however, calcite remained the predominant CaCO3 polymorph in all experiments with relative percentages exceeding 80% by mass in all precipitates.

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“…It possesses several advantages including abundant raw material sources, low prices, and a straightforward production process. [1][2][3][4][5] The current methods for preparing calcium hydroxide include the lime digestion method, precipitation method, alcoholic calcium salt method, calcium carbide method, [6][7][8][9][10] and others. Among them, the lime digestion method is widely employed worldwide for calcium hydroxide production due to its low investment cost, simple process, high yield, uncomplicated equipment, and stable operation.…”

Section: Introductionmentioning

confidence: 99%

Particle Size of Calcium Hydroxide Prepared by Wet Digestion: Influencing Factors and Mechanism

Wang,

Wei,

Liu

et al. 2024

Cryst. Res. Technol.

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The wet dissolution process of lime is an effective approach for synthesizing calcium hydroxide. Process parameters and additives exert influence on the product particle. Among the process parameters, lime particle size, reaction temperature, and time have a significant impact on product particle size, followed by liquid‐solid ratio and stirring speed. The experiment proved that reaction time affects product particle size by affecting the crystal growth, while other process parameters affect the particle size by affecting the ion diffusion behavior. In terms of inorganic additives, Ca(OH)2 has minimal effect on product particle size; however, NaOH and CaCl2 can significantly enhance it with a greater dose leading to a larger increase. The experiment proved that Ca(OH)2, NaOH, and CaCl2 influence particle size through their impact on ion diffusion behavior. Regarding organic additives, soluble starch exhibits the greatest effect on product size followed by triethanolamine and polyvinylpyrrolidone K30. The experiment proved that soluble starch, triethanolamine, and polyvinylpyrrolidone K30 affect product particle size by influencing its crystallization position. Finally, an ultrafine slurry of calcium hydroxide was prepared using the lime wet digestion method based on the aforementioned research, with particle size distribution characterized by D10, D50, and D90 values of 0.303, 1.750, and 4.534 µm respectively.

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PEG-assisted controlled precipitation of calcium hydroxide and calcium carbonate nanostructures for cement reinforcement

Cited by 14 publications

References 37 publications

Effect of Molarity on Methylene Blue Dye Removal Efficacy of Nano Ca(OH)₂

Effect of Molarity on Methylene Blue Dye Removal Efficacy of Nano Ca(OH)₂

Mineralogy, morphology, and reaction kinetics of ureolytic bio-cementation in the presence of seawater ions and varying soil materials

Particle Size of Calcium Hydroxide Prepared by Wet Digestion: Influencing Factors and Mechanism

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PEG-assisted controlled precipitation of calcium hydroxide and calcium carbonate nanostructures for cement reinforcement

Cited by 14 publications

References 37 publications

Effect of Molarity on Methylene Blue Dye Removal Efficacy of Nano Ca(OH)2

Effect of Molarity on Methylene Blue Dye Removal Efficacy of Nano Ca(OH)2

Mineralogy, morphology, and reaction kinetics of ureolytic bio-cementation in the presence of seawater ions and varying soil materials

Particle Size of Calcium Hydroxide Prepared by Wet Digestion: Influencing Factors and Mechanism

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Product

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About

Effect of Molarity on Methylene Blue Dye Removal Efficacy of Nano Ca(OH)₂

Effect of Molarity on Methylene Blue Dye Removal Efficacy of Nano Ca(OH)₂