Controllable synthesis of two CaO crystal generations: precursors' synthesis and formation mechanisms. Issue 47 (14th November 2017)

• Record Type: Journal Article
• Authors: Ma, Liang; Zhao, Bosheng; Shi, Huihu; Sha, Feng; Liu, Chang; Du, Hong; Zhang, Jianbin
• Is Part Of: CrystEngComm. Volume 19:Issue 47(2017)
• Page Start: 7132
• Page End: 7145
• Publication Date: 2017-11-14
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c7ce01561e
• Languages: English
• ISSNs: 1466-8033

Abstract

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. 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 (CO2 SM) with Ca(OH)2 without additional additives. In the preparation process, CO2 SM was not only used as a raw material but it also played the role of a directing agent. Moreover, as the major influence factors, CO2 SM dosage, reaction temperature, reaction time and Ca 2+ 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.