Vaterite calcium carbonate for the adsorption of Congo red from aqueous solutions

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Abstract

The present study describes the evaluation of vaterite calcium carbonate (CaCO3) for the adsorption of Congo red (CR) from aqueous solution. Vaterite CaCO3 is produced via a precipitation method assisted by ethylene glycol (EG), which acts as stabilizer to prevent transformation of vaterite to others polymorphs of CaCO3. The crystal structure of vaterite CaCO3 formed was proven by SEM, XRD and FTIR. The highest zeta potential of the vaterite CaCO3 was 15.2 mV, which was obtained at pH 5. Batch adsorption studies illustrated that the adsorption of CR to the vaterite CaCO3 was dependent on different parameters, such as pH, initial dye concentration and temperature. The adsorption isotherm data were highly consistent with Langmuir isotherm model, while the adsorption kinetics data fitted better to the pseudo-second-order model. The maximum adsorption capacity of the CaCO3, 32.60 mg/g, was obtained from the adsorption kinetic experiment under adsorption conditions, pH 5, adsorbent dose 0.2 g, adsorbate concentration 100 mg/L and temperature 25 °C. The adsorption of CR on the CaCO3 was proven to be endothermic and non-spontaneous in nature.

Original languageEnglish
Pages (from-to)2156-2161
Number of pages6
JournalJournal of Environmental Chemical Engineering
Volume2
Issue number4
DOIs
Publication statusPublished - 2015

Fingerprint

vaterite
Congo Red
Calcium Carbonate
Calcium carbonate
calcium carbonate
aqueous solution
adsorption
Adsorption
isotherm
Kinetics
Ethylene Glycol
kinetics
Zeta potential
Adsorbates
Ethylene glycol
Polymorphism
Adsorption isotherms
Adsorbents
Isotherms
crystal structure

Keywords

  • Adsorption
  • Calcium carbonate
  • Congo red
  • Ethylene glycol
  • Vaterite

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Process Chemistry and Technology
  • Pollution
  • Waste Management and Disposal

Cite this

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title = "Vaterite calcium carbonate for the adsorption of Congo red from aqueous solutions",
abstract = "The present study describes the evaluation of vaterite calcium carbonate (CaCO3) for the adsorption of Congo red (CR) from aqueous solution. Vaterite CaCO3 is produced via a precipitation method assisted by ethylene glycol (EG), which acts as stabilizer to prevent transformation of vaterite to others polymorphs of CaCO3. The crystal structure of vaterite CaCO3 formed was proven by SEM, XRD and FTIR. The highest zeta potential of the vaterite CaCO3 was 15.2 mV, which was obtained at pH 5. Batch adsorption studies illustrated that the adsorption of CR to the vaterite CaCO3 was dependent on different parameters, such as pH, initial dye concentration and temperature. The adsorption isotherm data were highly consistent with Langmuir isotherm model, while the adsorption kinetics data fitted better to the pseudo-second-order model. The maximum adsorption capacity of the CaCO3, 32.60 mg/g, was obtained from the adsorption kinetic experiment under adsorption conditions, pH 5, adsorbent dose 0.2 g, adsorbate concentration 100 mg/L and temperature 25 °C. The adsorption of CR on the CaCO3 was proven to be endothermic and non-spontaneous in nature.",
keywords = "Adsorption, Calcium carbonate, Congo red, Ethylene glycol, Vaterite",
author = "Chong, {Kai Yin} and Chia, {Chin Hua} and Sarani Zakaria and {Mohd Shaiful}, Sajab",
year = "2015",
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T1 - Vaterite calcium carbonate for the adsorption of Congo red from aqueous solutions

AU - Chong, Kai Yin

AU - Chia, Chin Hua

AU - Zakaria, Sarani

AU - Mohd Shaiful, Sajab

PY - 2015

Y1 - 2015

N2 - The present study describes the evaluation of vaterite calcium carbonate (CaCO3) for the adsorption of Congo red (CR) from aqueous solution. Vaterite CaCO3 is produced via a precipitation method assisted by ethylene glycol (EG), which acts as stabilizer to prevent transformation of vaterite to others polymorphs of CaCO3. The crystal structure of vaterite CaCO3 formed was proven by SEM, XRD and FTIR. The highest zeta potential of the vaterite CaCO3 was 15.2 mV, which was obtained at pH 5. Batch adsorption studies illustrated that the adsorption of CR to the vaterite CaCO3 was dependent on different parameters, such as pH, initial dye concentration and temperature. The adsorption isotherm data were highly consistent with Langmuir isotherm model, while the adsorption kinetics data fitted better to the pseudo-second-order model. The maximum adsorption capacity of the CaCO3, 32.60 mg/g, was obtained from the adsorption kinetic experiment under adsorption conditions, pH 5, adsorbent dose 0.2 g, adsorbate concentration 100 mg/L and temperature 25 °C. The adsorption of CR on the CaCO3 was proven to be endothermic and non-spontaneous in nature.

AB - The present study describes the evaluation of vaterite calcium carbonate (CaCO3) for the adsorption of Congo red (CR) from aqueous solution. Vaterite CaCO3 is produced via a precipitation method assisted by ethylene glycol (EG), which acts as stabilizer to prevent transformation of vaterite to others polymorphs of CaCO3. The crystal structure of vaterite CaCO3 formed was proven by SEM, XRD and FTIR. The highest zeta potential of the vaterite CaCO3 was 15.2 mV, which was obtained at pH 5. Batch adsorption studies illustrated that the adsorption of CR to the vaterite CaCO3 was dependent on different parameters, such as pH, initial dye concentration and temperature. The adsorption isotherm data were highly consistent with Langmuir isotherm model, while the adsorption kinetics data fitted better to the pseudo-second-order model. The maximum adsorption capacity of the CaCO3, 32.60 mg/g, was obtained from the adsorption kinetic experiment under adsorption conditions, pH 5, adsorbent dose 0.2 g, adsorbate concentration 100 mg/L and temperature 25 °C. The adsorption of CR on the CaCO3 was proven to be endothermic and non-spontaneous in nature.

KW - Adsorption

KW - Calcium carbonate

KW - Congo red

KW - Ethylene glycol

KW - Vaterite

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