Influence of Sodium Dodecyl Benzene Sulfonate on Crystallization Behavior of Calcium Carbonate†

doi:10.7503/cjcu20180020

Abstract

Abstract:

CaCO₃ particles were prepared by gas diffusion method with CaCl₂ and (NH₄)₂CO₃ as raw materials and sodium dodecyl benzene sulfonate(SDBS) as the template. The effect of SDBS of different concentrations on the crystallization behavior and morphology of CaCO₃ in solution was studies. The results of scanning electron microscopy(SEM), X-ray diffraction(XRD) and Fourier transform infrared spectroscopy(FTIR) show that the CaCO₃ sample was mainly calcite crystal with regular rhombic hexahedron morphology when SDBS was not added to the solution, and vaterite crystals with spherical morphology when SDBS was added to the solution, indicating that adding SDBS to the solution could change the crystal growth mode of CaCO₃. With the increase of SDBS concentration in the solution, the relative content of vaterite crystals in the CaCO₃ samples increased gradually. When the concentration of SDBS was 1.2 mmol/L, almost all the samples were vaterite crystals. With the further increase of SDBS concentration in the solution, due to the change of micelle morphology and the deterioration of stability, the metastable vaterite crystal in the sample changed to the stable calcite crystal, the relative content of the vaterite crystal gradually decreased, and the crystal presented flower, hexagonal, spindle shapes and other morphological features.

Key words: Calcium carbonate, Gas diffusion method, Vaterite, Calcite

CLC Number:

O614
O647.3

TrendMD:

LI Mengwei, ZHAO Changming, CHENG Tiexin, ZHOU Guangdong. Influence of Sodium Dodecyl Benzene Sulfonate on Crystallization Behavior of Calcium Carbonate^†[J]. Chem. J. Chinese Universities, 2018, 39(11): 2380.

Figures/Tables 4

Fig.1 SEM images of CaCO3 prepared in SDBS solution with different concentrationsc(SDBS)/(mmol·L-1): (A) 0; (B) 0.8; (C) 1.2; (D) 1.4; (E) 1.6. The insets are the amplified images of the corresponding samples.

Fig.2 Powder XRD patterns of CaCO3 prepared in solution with different SDBS concentrationscSDBS/(mmol·L-1): a. 0; b. 0.8; c. 1.2; d. 1.4; e. 1.6.

Table 1 Relative content of calcium and vaterite prepared in solution with different SDBS concentrations

c(SDBS)/(mmol·L^-1)	Vaterite content(%)	Calcium content(%)
0	0	100
0.8	71.5	28.5
1.2	98.0	2.0
1.4	81.4	18.6
1.6	75.4	24.6

Fig.3 FTIR spectra of CaCO3 prepared in solution with different SDBS concentrationsc(SDBS)/(mmol·L-1): a. 0; b. 0.8; c. 1.2; d. 1.4; e. 1.6. *: Calcium carbonate; V: vaterite; C: calcite.

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