One-step Preparation and Characterization of Broccoli-like Calcium Carbonate †

doi:10.7503/cjcu20190291

Abstract

Abstract:

Strontium nitrate as an additive was added in the system to prepare uniform distributed broccoli-like calcium carbonate particles. The one-step synthetic method was used which is safe and environment-friendly. The resulting calcium carbonate was characterized through scanning electron microscope(SEM), X-ray diffraction(XRD) and energy dispersive X-ray analysis(EDAX). Meanwile, the possible reaction mechanism of calcium carbonate was put forward.

Key words: Calcium carbonate, In situ preparation, Precipitation reaction, Broccoli-like

CLC Number:

O614
O647

TrendMD:

SONG Yunchao,ZHAO Lina,ZHAO Fangwei,CAO Yang,WANG Jiku. One-step Preparation and Characterization of Broccoli-like Calcium Carbonate ^†[J]. Chem. J. Chinese Universities, 2019, 40(10): 2046.

Figures/Tables 8

Fig.1 SEM images of broccoli-like CaCO3 obtained in the presence of Sr(NO3)2 with low(A) and high(B) magnifications

Fig.2 XRD patterns of unmodified CaCO3(A) and broccoli-like CaCO3 obtained in the presence of Sr(NO3)2(B)

Fig.3 SEM images of CaCO3 obtained in the presence of Sr(NO3)2 at 20 ℃(A), 40 ℃(B), 60 ℃(C) and 80 ℃(D)

Fig.4 SEM images of CaCO3 obtained in the presence of Sr(NO3)2 at 1 h(A), 2 h(B) and 3 h(C)

Fig.5 XRD patterns of CaCO3 obtained in the presence of Sr(NO3)2 at 1 h(a), 2 h(b) and 3 h(c)

Fig.6 EDAX patterns of CaCO3 obtained in the presence of Sr(NO3)2 at 1 h(A), 2 h(B) and 3 h(C)

Reaction time/h	Element	Mass ratio(%)	Atomic ratio(%)	Reaction time/h	Element	Mass ratio(%)	Atomic ratio(%)
1	N	1.38	1.96	2	Sr	0.45	0.11
	O	66.09	82.03		Ca	41.08	21.79
	Sr	0.42	0.09	3	N	0.19	0.29
	Ca	32.11	15.91		O	60.63	79.40
2	N	2.16	3.28		Sr	0.61	0.15
	O	56.32	74.83		Ca	38.57	20.16

Scheme 1 Mechanism of broccoli-like CaCO3 modulated by Sr(NO3)2

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