Abstract
Homogeneous CaCO3 microspheres were controllably synthesized via a simple hydrothermal method without using extraneous additives by Ca(OH)2 saturated solution reacted with CO2 storage material (CO2SM), which was obtained by absorbing CO2 gas in a system containing equimolar ethylenediamine (EDA) and polyethylene glycol 400 (PEG). Specifically, homogeneous pure vaterite spheres were obtained by using 160 g/L CO2SM solution at 100 °C and a reaction time of two hours. It is noteworthy that the EDA and PEG, which are released from CO2SM, have dual functions as a CO2 absorber and crystal regulator in the process of controlling the crystallization of CaCO3 crystals.
Highlights
Climate change, one of the most disturbing global environmental issues, primarily relates to continuously increasing CO2 emission from burning fossil fuels [1,2,3]
CO2 SM was obtained by compressed CO2 was 99.999%, which was provided by the China Standard Things Center, Beijing, capturing via the equimolar EDA + PEG400 system according to the previous study
CO2 storage material (CO2SM) was obtained by capturing via the equimolar EDA + PEG400 system according to the previous study
Summary
One of the most disturbing global environmental issues, primarily relates to continuously increasing CO2 emission from burning fossil fuels [1,2,3]. The pure vaterite phase CaCO3 crystals is studied most widely because it has a larger specific surface and porous nature that could improve mechanical properties when they are used as filler [24,25,26]. It is challenging for the synthesis of stable vaterite when CO2 is used as a direct raw chemical because the process is more dependent on the calcium source. The morphology of CaCO3 powders prepared by carbonization is disordered and the particle size is not uniform [27,28]. Solution, and CaCO33 particles particleswith with the the same same crystal crystal phase phase were were recycled recycled to to obtain obtain the same reaction conditions
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