Formation and Transformation Trends of Metal Carbonates With Cation Ratio and Ion Interaction in Post-treatment Process of Desalination Brine

BackgroundTo address the negative effects of desalination plants, CO2 emissions, and discharge of desalination brine, we studied the carbon capture utilization (CCU) process based on metal carbonation via the reuse of desalination brine. In this study, we converted CO2 and simulated desalination brine into metal carbonate using monoethanolamine as an aqueous absorbent. The produced metal carbonate varied according to the cation component of the simulated desalination brine. We focused on ion interactions in the aqueous system, occurred by cation ratio, and other phenomena caused by the interactions.ResultsWe determined that the common ion effect, which occurred owing to the ion interactions of the system, was the main reason for the various carbonation trends. Ionic atmospheres that were changed by the ionic components significantly affected the trends. The high salinity of the desalination brine also affected the metal carbonation. We further deduced that the variation in the results was derived from interactions between the abovementioned effects. And we also found that Na+, which was overlooked in former studies about polymorph transformation, also affects polymorph transformation.ConclusionsAll the phenomena in the metal carbonation interrupt desalination brine post-treatment because of their unpredictability. However, we suggest ambient estimation of its cation components, which would help future studies and demonstrate desalination brine post-treatment.

Investigating the Stable Operating Voltage for MnFe2O4 Li-ion Battery Anode

Template-free synthesis of MnFe2O4 nanopowder is carried out by co-precipitation in a basic medium, evaluating the effects of cation ratio and reaction temperature on the phase composition and crystallinity of...

Application of geothermal thermometric scale in the study of deep reservoir temperature

The aim of this work is to determine the thermal storage temperature of a deep thermal reservoir, which has a great significance for the effective utilization of geothermal resources. The temperature of the reservoir was estimated by the cation ratio geothermometer and SiO2 geothermometer methods. The results indicate that the K–Mg geothermometer is the best method of the cation ratio methods, with the calculated temperature of 108°C. The average value calculated by the SiO2 method was 107°C. The measured temperature of the GRY1 drilling water sample in the Cangxian arch belt was 108°C. Because the calculated results of the geothermometers were consistent with the measured value of the borehole water, the K–Mg and SiO2 geothermometers are suitable for the estimation of deep heat storage temperatures.