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Issue 47, 2017
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Controllable synthesis of two CaO crystal generations: precursors' synthesis and formation mechanisms

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Abstract

In this study, novel rod-like and block-like CaO crystals were prepared after calcinating three types of CaCO3 precursors containing dumbbell-like, wheat spike-like and microsphere-like morphologies at 1000 °C for 3 h. The CaCO3 precursors were synthesized via the hydrothermal reaction of a CO2 storage-material (CO2SM) with Ca(OH)2 without additional additives. In the preparation process, CO2SM was not only used as a raw material but it also played the role of a directing agent. Moreover, as the major influence factors, CO2SM dosage, reaction temperature, reaction time and Ca2+ concentration were systemically investigated. Subsequently, the possible formation mechanism of the CaCO3 precursors was proposed. Finally, the as-obtained CaO crystals exhibit the adsorption amounts of 14.67, 16.32 and 7.50 mg g−1 for an 8% CO2/N2 mixture at 25 °C.

Graphical abstract: Controllable synthesis of two CaO crystal generations: precursors' synthesis and formation mechanisms

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Supplementary files

Article information


Submitted
28 Aug 2017
Accepted
02 Nov 2017
First published
14 Nov 2017

CrystEngComm, 2017,19, 7132-7145
Article type
Paper

Controllable synthesis of two CaO crystal generations: precursors' synthesis and formation mechanisms

L. Ma, B. Zhao, H. Shi, F. Sha, C. Liu, H. Du and J. Zhang, CrystEngComm, 2017, 19, 7132
DOI: 10.1039/C7CE01561E

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