十二烷基苯磺酸钠对碳酸钙结晶行为的影响

doi:10.7503/cjcu20180020

摘要/Abstract

摘要：

以CaCl₂和(NH₄)₂CO₃为原料, 以十二烷基苯磺酸钠(SDBS)为模板剂, 采用气体扩散法制备了CaCO₃颗粒, 研究了溶液中不同浓度SDBS对CaCO₃结晶行为及形貌特征的影响. 扫描电子显微镜(SEM)、 X射线衍射(XRD)和傅里叶变换红外光谱(FTIR)表征结果表明, 当溶液中不添加SDBS时, CaCO₃样品主要为方解石型晶体, 呈规则菱形六面体形貌; 当溶液中添加SDBS时, CaCO₃样品主要以球霰石型晶体存在, 呈球形. 这说明在溶液中添加SDBS可以改变CaCO₃的结晶生长方式. 随着溶液中SDBS浓度增加, 所生成的CaCO₃样品中球霰石型晶体相对含量逐渐增加. 当SDBS浓度为1.2×10^-3 mol/L时, 样品中几乎全部为球霰石型晶体. 继续增加溶液中SDBS浓度, 由于胶束形态改变和稳定性变差, 样品中亚稳态的球霰石型晶体向稳定的方解石型晶体转变, 球霰石型晶体相对含量逐渐减少, 并呈现花形、六边形和纺锤形等多种形貌特征.

关键词: 碳酸钙, 气体扩散法, 球霰石, 方解石

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

中图分类号:

O614
O647.3

TrendMD:

李梦维, 赵昌明, 程铁欣, 周广栋. 十二烷基苯磺酸钠对碳酸钙结晶行为的影响. 高等学校化学学报, 2018, 39(11): 2380.

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

图/表 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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