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Investigating the hydration of C3A in the presence of the potentially toxic element chromium–a route to remediation?

DOI: 10.1039/D2RA04497H DOI Help

Authors: Rebecca Rae (University of Edinburgh) , Margaret C. Graham (University of Edinburgh) , Caroline A. Kirk (University of Edinburgh)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Rsc Advances , VOL 12 , PAGES 29329 - 29337

State: Published (Approved)
Published: October 2022
Diamond Proposal Number(s): 23914

Open Access Open Access

Abstract: Pollution by hexavalent chromium is a growing, global problem. Its presence in public water systems is often the result of industrial activities, both past and present. In this study, tricalcium aluminate (C3A, Ca3Al2O6) is added to solutions of varying concentrations of potassium chromate (K2CrO4) and samples of both the solid and liquid are taken at various time intervals to monitor the removal of chromium from the solutions. Solution concentrations of 0.2 M, 0.1 M, 0.02 M, and 0.01 M are used, and the chromium concentration is found to reduce in all cases. For the 0.02 M solution the chromium concentration is reduced from 1040 ppm to 3.1 ppm in 1 week, and the chromium concentration of the 0.01 M solution is reduced from 520 ppm to 0.26 ppm in only one day of reaction with the C3A. The chromium removed from solution is identified in the solid products, which were fully characterised as being a mixture of ettringite (Ca6[Al(OH)6]2(CrO4)3·26H2O) and monochromate (Ca4[Al(OH)6]2CrO4·8H2O) phases from analysis of Powder X-ray Diffraction and Fourier Transform Infrared Spectroscopy data. The work presented here is a proof of concept study to investigate C3A as a potential material for the removal of hexavalent chromium from solution. The results from this study are initial steps towards development of this as a technology for hexavalent chromium remediation.

Subject Areas: Chemistry, Environment


Instruments: I11-High Resolution Powder Diffraction

Added On: 17/10/2022 10:28

Documents:
d2ra04497h.pdf

Discipline Tags:

Desertification & Pollution Earth Sciences & Environment Chemistry Chemical Engineering Engineering & Technology Inorganic Chemistry

Technical Tags:

Diffraction X-ray Powder Diffraction