Effect of Graphene Oxide on the Crystallization of Calcium Carbonate by C3S Carbonation.

Dapeng Zheng,Bo Zhang,Hongzhi Cui,Haibin Yang,Feng Yu

doi:10.3390/ma12132045

Dapeng Zheng, Bo Zhang + Show 3 more

Open Access

https://doi.org/10.3390/ma12132045

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Journal: Materials	Publication Date: Jun 26, 2019
Citations: 9	License type: CC BY 4.0

Affiliation: City University of Hong Kong, Shenzhen University

Abstract

The effect of graphene oxide (GO) on the crystallization of calcium carbonate (CaCO3) is explored in this paper. Precipitation of CaCO3 was carried out by bubbling carbon dioxide (CO2) through tricalcium silicate (C3S) hydration solution with different graphene oxide admixture contents (0.2%, 1% and 2% mass ratios based on C3S). The polymorph, morphology, crystal size and particle size of CaCO3 were evaluated using X-ray diffraction (XRD), an environmental scanning electronic microscope (ESEM), and laser particle size analysis. The results showed that addition of GO was able to promote the conversion of CaCO3 to a calcite crystal phase with higher thermal stability and crystallinity than the control. However, as the dosage of GO increased, the growth of the calcite crystal particles was somewhat suppressed, resulting in a decrease in the crystal particle size and a narrow particle size distribution. When the amount of GO was 0.2%, 1% and 2%, the crystal size of the calcite was 5.49%, 12.38%, and 24.61% lower than that of the sample without GO, respectively, while the particle size of the calcite also decreased by 17.21%, 39.26%, 58.03%, respectively.

Highlights

In recent years, the application of graphene oxide (GO) has been widely studied because of its unique physicochemical and structural properties [1,2]
A GO dispersion (6.4 g/L, Laboratory synthesis) synthesis) was used in this experiment, along with pure CO2 supplied by Shente company was used in this experiment, along with pure CO2 supplied by Shente company (Shenzhen, China)
The CaCO3 crystals formed by carbonization of the C3 S hydration products—with different mass ratios of GO—were measured by X-ray diffraction (XRD)

Summary

Introduction

The application of graphene oxide (GO) has been widely studied because of its unique physicochemical and structural properties [1,2]. Some studies [3,4,5,6,7,8] have reported that GO, as a reinforcing material, can improve the mechanical properties and microstructure of cementitious composites because of its high specific strength, high toughness, large specific surface area and low weight. Researchers usually use a variety of additives, such as surfactants, metallic ions, and GO, to control the crystallization, nucleation and crystal growth process of CaCO3 [23,24,25,26,27,28]

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Results

Conclusion