Stability of CaCO3 in Ca(OH)2 solution

Kilic, Sevgi; Toprak, Gorkem; Ozdemir, Ekrem

doi:10.1016/j.minpro.2015.12.006

Cited by 40 publications

(42 citation statements)

References 34 publications

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“…As shown in the figure, before the crystallization, the average particle size was about 530 nm and the zeta potential was measured to be 40 mV. These particles were mostly CaCO 3 particles distributed in the Ca(OH) 2 solution as the impurity, which are in good agreement with our previous report [29]. As soon as CO 2 was injected into the solution, the average particle size was measured to be about 250 nm and zeta potential values were increased to 55 mV.…”

Section: Resultssupporting

confidence: 91%

“…As soon as the CO 2 was injected into the system in bubble form, almost a linear decrease in the conductivity and a slight decrease in pH were observed at the early stage of crystallization. The decrease in conductivity was related to the consumption of Ca þ þ ions in the solution [29]. As can be seen from the conductivity values, the crystallization rate seems to be higher at the earlier stages of crystallization and it was relatively slower during the late stages of the crystallization.…”

Section: Resultsmentioning

confidence: 90%

“…As soon as the CO 2 bubbles were injected in the solution, rice-like CaCO 3 particles formed with an average particle size of about 250 nm. Not much aggregation was seen due to the stability effect of Ca(OH) 2 solution [29], where the zeta potential values were higher than þ30 mV [20]. As the crystallization progress, the particles was shown to grow slightly as their number increased due to newly formed nano-CaCO 3 particles.…”

Section: Resultsmentioning

confidence: 98%

“…In order to understand the phenomena occurring in CaCO 3 crystallization in Ca(OH) 2 as in the carbonization method, the zeta potential values of CaCO 3 particles in Ca(OH) 2 solution were investigated and reported recently in our previous paper [29]. The dissolution of CaCO 3 and Ca(OH) 2 powders both produced ions such as Ca þ þ , , OH À , and Ca(OH) þ as well as newly synthesized nano-CaCO 3 particles in the solution.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous paper [29], we have reported that the zeta potential for CaCO 3 particles was more than þ 30 mV in Ca(OH) 2 solution and the Ca(OH) 2 solution is indeed a natural stabilizer for the newly produced CaCO 3 particles. We now propose that nano-CaCO 3 particles could be produced in homogenous size distribution when the stability of the clusters could be achieved in the colloidal solution.…”

Section: Introductionmentioning

confidence: 83%

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Rice-like hollow nano-CaCO 3 synthesis

Ulkeryildiz¹,

Kilic²,

Ozdemir³

2016

Journal of Crystal Growth

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a b s t r a c tWe have shown that Ca(OH) 2 solution is a natural stabilizer for CaCO 3 particles. We designed a CO 2 bubbling crystallization reactor to produce nano-CaCO 3 particles in homogenous size distribution without aggregation. In the experimental set-up, the crystallization region was separated from the stabilization region. The produced nanoparticles were removed from the crystallization region into the stabilization region before aggregation or crystal growth. It was shown that rice-like hollow nano-CaCO 3 particles in about 250 nm in size were produced with almost monodispersed size distribution. The particles started to dissolve through their edges as CO 2 bubbles were injected, which opened-up the pores inside the particles. At the late stages of crystallization, the open pores were closed as a result of dissolution-recrystallization of the newly synthesized CaCO 3 particles. These particles were stable in Ca(OH) 2 solution and no aggregation was detected. The present methodology can be used in drug encapsulation into inorganic CaCO 3 particles for cancer treatment with some modifications.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 83%

See 3 more Smart Citations

Rice-like hollow nano-CaCO 3 synthesis

Ulkeryildiz¹,

Kilic²,

Ozdemir³

2016

Journal of Crystal Growth

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Ca(OH)₂ Pre‐Treated Bentonite for Phosphorus Removal and Recovery From Synthetic and Real Wastewater

Μάρκου

Mitrogiannis

Inglezakis

et al. 2018

CLEAN Soil Air Water

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The performance of chemically pre‐treated bentonite with Ca(OH)2 toward ortho‐phosphate phosphorus (OPP) removal efficiency in synthetic (inorganic) and real (anaerobically digested effluents) wastewater (WW) is evaluated. The Ca(OH)2 pre‐treated bentonite displays a significant increase of OPP uptake (qe; mg P g−1 bentonite) of 40 and 15 times, reaching about 14 and 5.5 mg P g−1 for synthetic and real WW, respectively. The optimum pH for OPP sorption is 7, while at higher pH values, although OPP removal is high due to the precipitation in the liquid phase, the OPP removal in solid phase, that is, sorption onto bentonite surface is less compared to pH 7. Scanning electron microscopy (SEM) and X‐ray diffraction (XRD) analysis shows that OPP forms various complexes with co‐existing ions in WW, such as apatite (with Ca2+) and struvite (with NH4+ and Mg2+). The most influential parameter of the pre‐treatment is the dosage of Ca(OH)2. Concentration of 0.5 M Ca(OH)2 or higher is necessary for an efficient pre‐treatment. In contrast, the concentration of bentonite does not affect the pre‐treatment efficiency, and a mass of 500 g L−1 bentonite is found to be sufficient. The chemical pre‐treatment with Ca(OH)2 renders bentonite a promising low‐cost sorbent for OPP removal and recovery from WW.

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The effect of four calcium‐based amendments on soil aggregate stability of two sandy topsoils

Vargas

Verdejo

Rivera

et al. 2018

J. Plant Nutr. Soil Sci.

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The structural stability of soil is a physical characteristic that affects soil degradation processes. Calcium‐based amendments, such as calcium carbonate, calcium sulfate, and calcium oxide/hydroxide, have been shown to improve the stability of soil aggregates. This study seeks to determine which calcium‐based soil amendments, and at what concentration, are the most efficient in improving aggregate stability of sandy topsoils derived from granitic and metamorphic parent materials, and to analyze the mechanisms involved. In the pot experiment, soils amended with CaCO3, CaCl2, and CaSO4 did not present significant differences in aggregate stability compared to the control or among each other. In contrast, Ca(OH)2 soil amendment brought the greatest stability to the soil aggregates. A dose of 1% Ca(OH)2 significantly increased the stability of soil aggregates. This effect is due to the reaction of Ca(OH)2 with atmospheric CO2 which leads to the formation of CaCO3, a delayed reaction not showed by the other soil amendments tested. Likewise, the greater solubility of Ca(OH)2 compared to CaCO3 exerts a greater aggregation effect on soil. Thus, the mechanism of action of Ca(OH)2 is related to cementation, rather than flocculation. Future studies should be carried out to demonstrate the effectiveness of Ca(OH)2 under field conditions.

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Stability of CaCO3 in Ca(OH)2 solution

Cited by 40 publications

References 34 publications

Rice-like hollow nano-CaCO 3 synthesis

Rice-like hollow nano-CaCO 3 synthesis

Ca(OH)₂ Pre‐Treated Bentonite for Phosphorus Removal and Recovery From Synthetic and Real Wastewater

The effect of four calcium‐based amendments on soil aggregate stability of two sandy topsoils

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Stability of CaCO3 in Ca(OH)2 solution

Cited by 40 publications

References 34 publications

Rice-like hollow nano-CaCO 3 synthesis

Rice-like hollow nano-CaCO 3 synthesis

Ca(OH)2 Pre‐Treated Bentonite for Phosphorus Removal and Recovery From Synthetic and Real Wastewater

The effect of four calcium‐based amendments on soil aggregate stability of two sandy topsoils

Contact Info

Product

Resources

About

Ca(OH)₂ Pre‐Treated Bentonite for Phosphorus Removal and Recovery From Synthetic and Real Wastewater