Next Article in Journal
The Influence of Common Monovalent and Divalent Chlorides on Chalcopyrite Flotation
Next Article in Special Issue
Desiccator Volume: A Vital Yet Ignored Parameter in CaCO3 Crystallization by the Ammonium Carbonate Diffusion Method
Previous Article in Journal
Discrete Element Modelling of Footwall Rock Mass Damage Induced by Sub-Level Caving at the Kiirunavaara Mine
Previous Article in Special Issue
Crystallization of Jarosite with Variable Al3+ Content: The Transition to Alunite
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessArticle
Minerals 2017, 7(7), 110; https://doi.org/10.3390/min7070110

Ammonium-Carbamate-Rich Organogels for the Preparation of Amorphous Calcium Carbonates

Department of Materials and Environmental Chemistry, Stockholm University, SE 106 91 Stockholm, Sweden
*
Author to whom correspondence should be addressed.
Received: 31 May 2017 / Revised: 17 June 2017 / Accepted: 18 June 2017 / Published: 27 June 2017
View Full-Text   |   Download PDF [6414 KB, uploaded 27 June 2017]   |  

Abstract

Amine-CO2 chemistry is important for a range of different chemical processes, including carbon dioxide capture. Here, we studied how aspects of this chemistry could be used to prepare calcium carbonates. Chemically crosslinked organogels were first prepared by reacting hyperbranched polyethylene imine (PEI) dissolved in DMSO with carbon dioxide. The crosslinks of the organogel consisted of ammonium-carbamate ion pairs as was shown by IR spectroscopy. These carbamate-rich organogels were subsequently subjected to aqueous solutions of calcium acetate, and amorphous calcium carbonate (ACC) precipitated. The ACC did not crystalize during the mixing for up to 20 h, as was shown by a combination of IR spectroscopy, X-ray diffraction, scanning electron microscopy, and thermal analysis. Some PEI had been included or adsorbed on the ACC particles. Traces of calcite were observed in one sample that had been subjected to water in a work-up procedure. View Full-Text
Keywords: amine; carbon dioxide; ammonium-carbamate ion pairs; organogel; amorphous calcium carbonate (ACC) amine; carbon dioxide; ammonium-carbamate ion pairs; organogel; amorphous calcium carbonate (ACC)
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Bacsik, Z.; Zhang, P.; Hedin, N. Ammonium-Carbamate-Rich Organogels for the Preparation of Amorphous Calcium Carbonates. Minerals 2017, 7, 110.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Minerals EISSN 2075-163X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top