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Vol. 30 No. 12 (2018): Vol 30 Issue 12

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Nanoscale Phenomena During Crystal Growth of CaxCd1-xCO3 Solid Solution at Calcite Surface Exposed to Cadmium Bearing Aqueous Solution

https://doi.org/10.14233/ajchem.2018.21543
Wenlei Wang
College of Science, Central South University of Forestry and Technology, Changsha 410004, Hunan Province, P.R. China
Tianli Yang
College of Science, Central South University of Forestry and Technology, Changsha 410004, Hunan Province, P.R. China
Jiao Shi
Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South University, Changsha 410083, Hunan Province, P.R. China
Ren He
College of Science, Central South University of Forestry and Technology, Changsha 410004, Hunan Province, P.R. China
Han Huang
Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South University, Changsha 410083, Hunan Province, P.R. China
Yunchu Hu
College of Science, Central South University of Forestry and Technology, Changsha 410004, Hunan Province, P.R. China
LichaoWu
Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees, Ministry of Education, Central South University of Forestry and Technology, Changsha 410004, Hunan Province, P.R. China

Corresponding Author(s) : Wenlei Wang

wenlei_wang@hotmail.com

Asian Journal of Chemistry, Vol. 30 No. 12 (2018): Vol 30 Issue 12

Abstract

The crystal growth of CaxCd1-xCO3 solid solution play an important role in understanding the transformation relationship of the calcite surface exposed to cadmium-bearing aqueous solution. in situ AFM measurements were used to perform the real-time tracking of surface precipitates that are generated on the surface of calcite single crystals reacted with Cd2+ solution. As evidenced by changes in the height, shape and growth behaviour, two-dimensional epitaxial island was detected to form and grow on the surfaces. These detections of the generated crystals by SEM, EDS and TEM have demonstrated the formation of an epitaxial CaxCd1-xCO3 solid solution. The epitaxial solid solution within nanometers was first rich in caelement and the content of cadmium increased with the distance from the original calcite surface, culminating almost pure CdCO3 in the topmost region. A low-cadmium solid solution with thermodynamic instability could be transformed into a cadmium-rich solid solution and form continuous solid solution in the process of maturation. This study aims to provide a better understanding of nanoscale features of the surface precipitation process at calcite surface in the presence of cadmium.

Keywords

Crystal growth Solid solution CaxCd1-xCO3 Calcite
Wang, W., Yang, T., Shi, J., He, R., Huang, H., Hu, Y., & LichaoWu, . (2018). Nanoscale Phenomena During Crystal Growth of CaxCd1-xCO3 Solid Solution at Calcite Surface Exposed to Cadmium Bearing Aqueous Solution. Asian Journal of Chemistry, 30(12), 2671–2676. https://doi.org/10.14233/ajchem.2018.21543
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