Polymorphism in CaCO3 — Effect of temperature under the influence of EDTA (di sodium salt)

Gopi, Shanmukha Prasad; Subramanian, V.

doi:10.1016/j.desal.2012.04.015

Cited by 63 publications

(31 citation statements)

References 22 publications

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“…5b). It is well known that calcite, aragonite and vaterite have rhomboidal, needle/rod and spherical structures, respectively (Gopi and Subramanian, 2012). So we could conclude that the main crystal structure of CaCO 3 had changed from calcite to aragonite after adding the scale inhibitor.…”

Section: Sem Micrographs Of Caco 3 Crystals In the Absence And Presenmentioning

confidence: 93%

Effect of six kinds of scale inhibitors on calcium carbonate precipitation in high salinity wastewater at high temperatures

Gao

Yue

et al. 2015

Journal of Environmental Sciences

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Section: Sem Micrographs Of Caco 3 Crystals In the Absence And Presenmentioning

confidence: 93%

Effect of six kinds of scale inhibitors on calcium carbonate precipitation in high salinity wastewater at high temperatures

Gao

Yue

et al. 2015

Journal of Environmental Sciences

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“…In our earlier studies, we have reported that in the absence of any chelating agents, formation of calcite is predominant at higher temperatures above 170˚C [28]. FTIR spectra of samples prepared in the presence of NTA are presented in Fig 1(a).…”

Section: Polymorphic Identification and Phase Confirmation By Ftir Spmentioning

confidence: 95%

“…CaCO 3 was crystallized by a modified method from a described one [28]. A typical procedure is as follows: 50 ml 0.1 M CaCl 2 , 20 ml of 0.1 M NTA, and 60 ml 0.1 N Na 2 CO 3 were consecutively added in a Buchner flask, closed tightly with a glass lid to avoid any contamination and kept inside the autoclave.…”

Section: Preparation Of Cacomentioning

confidence: 99%

Effect of NTA and temperature on crystal growth and phase transformations of CaCO₃

Gopi

Kumaravel

Subramanian

2014

Desalination and Water Treatment

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A B S T R A C TPhase transition from vaterite to calcite is a general behavior of CaCO 3 materials. The effect of nitrilotriacetic acid disodium salt (NTA) on the crystallization behavior and polymorphism of CaCO 3 was studied at different temperatures between 60 and 230˚C. The morphologies and the structure of the precipitates were characterized using scanning electron microscope, field emission scanning electron microscopy, powder X-ray diffraction, Raman spectroscopy, and Fourier transform infrared spectroscopy. It was observed that NTA could change the morphologies and crystal structures of CaCO 3 with temperature and stabilize least stable vaterite at high temperature. An anomalous conversion of calcite to vaterite in the presence of NTA was observed. The effect of amount of NTA added on the crystallization behavior at selected temperatures is reported.

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“…Calcite is the thermodynamically stable phase of CaCO 3 (14), whereas veterite is a crystal formed in the supersaturated solution [3] and considered as unstable phase [15]. In the presence of 10 ppm Cu 2+ additive and at a temperature of 45 O C, it is shown in Figure 3b that crystal morphology is aragonite (needle) and calcite (cube).…”

Section: Characterisation Of the Crystal Scalementioning

confidence: 99%

“…Principally, calcium carbonate have three crystalline phases, namely calcite, vaterite and aragonite. The stability and formation of these phases are very temperature and concentration dependent [3]. Here calcite is particularly stable at room temperature, while aragonite can be formed at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Crystallization of calcium carbonate (CaCO3) in a flowing system: Influence of Cu2+ additives on induction time and crystalline phase transformation

Usmany¹,

Putranto²,

Bayuseno³

et al. 2016

AIP Conference Proceedings

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The Raman spectrum of CaCO 3 polymorphs calcite and aragonite: A combined experimental and computational study The Journal of Chemical Physics 140, 164509 (2014) Abstract. Scaling of calcium carbonate (CaCO 3 ) is commonly found in piping systems in oil, gas, desalination and other chemical processes. The scale may create technical problems, leading to the reduction of heat transfer, increase of energy consumption and unscheduled equipment shutdown. This paper presents crystallization scaling experiments and evaluation of the effect of Cu 2+ additives on the induction time and calcium carbonate transformation. The crystals precursors were prepared using equimolar of CaCl 2 and Na 2 CO 3 resulted in concentrations of 3000 ppm Ca 2+ in the solution. The Cu 2+ in amounts of 0, 1 and 10 ppm was separately added in the solution. The flow rates (20, 35, and 60 mL/min) and elevated temperatures (27, 35 and 45 0 C) were selected in the study. The induction time for crystallization of CaCO 3 was observed by measuring the solution conductivity over time, while the phase transformation of calcium carbonate was examined by XRD method and SEM/EDX. It was found that the conductivity remained steady for a certain period reflecting to the induction time of crystal formation, and then decreased sharply afterwards,. The induction time was increased from 34 and 48 minutes in the presence of Cu additives (1 and 10 ppm), depending on the flow rates and temperature observed. In all the experiments, the Cu 2+ addition leads to the reduction of mass of crystals. Apparently, the presence of Cu 2+ could inhibit the CaCO 3 crystallization. In the absence of Cu 2+ and at elevated temperature, the crystals obtained were a mixture of vaterite and calcite. In the presence of Cu 2+ and at elevated temperature, the crystals formed were aragonite and calcite. Here, the presence of Cu 2+ additives might have controlled the crystal transformation of CaCO 3 .

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Polymorphism in CaCO3 — Effect of temperature under the influence of EDTA (di sodium salt)

Cited by 63 publications

References 22 publications

Effect of six kinds of scale inhibitors on calcium carbonate precipitation in high salinity wastewater at high temperatures

Effect of six kinds of scale inhibitors on calcium carbonate precipitation in high salinity wastewater at high temperatures

Effect of NTA and temperature on crystal growth and phase transformations of CaCO₃

Crystallization of calcium carbonate (CaCO3) in a flowing system: Influence of Cu2+ additives on induction time and crystalline phase transformation

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Polymorphism in CaCO3 — Effect of temperature under the influence of EDTA (di sodium salt)

Cited by 63 publications

References 22 publications

Effect of six kinds of scale inhibitors on calcium carbonate precipitation in high salinity wastewater at high temperatures

Effect of six kinds of scale inhibitors on calcium carbonate precipitation in high salinity wastewater at high temperatures

Effect of NTA and temperature on crystal growth and phase transformations of CaCO3

Crystallization of calcium carbonate (CaCO3) in a flowing system: Influence of Cu2+ additives on induction time and crystalline phase transformation

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Effect of NTA and temperature on crystal growth and phase transformations of CaCO₃