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CO2 sequestration: high conversion of gypsum into CaCO3 by ultrasonic carbonation

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Abstract

Offsetting global warming requires rapid methods to sequester atmospheric carbon dioxide (CO2), a major greenhouse gas. For instance, mineral carbonation of gypsum from flue gas desulfurization (FGD) is a potential technology for CO2 sequestration, yet reaction conditions are not actually optimized to produce a recyclable product. Here, we transformed gypsum, CaSO4·2H2O, into vaterite, CaCO3, by sonication. We studied conversion, phase compositions and morphologies of carbonation products, and sulfate (SO42−) concentrations during carbonation. Results show that the conversion of CaSO4·2H2O increased from 60 to 98% with ultrasonic amplitude. Pure vaterite was obtained at 50% ultrasonic amplitude in 30 min. Low Ca2+/CO32− ratio, high concentration of SO42− and their synergistic effects appear as key factors to form vaterite. Overall, findings reveal the feasibility of gypsum carbonation to produce high-value vaterite by sonication.

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Acknowledgements

This work was supported by the National Key R&D Program of China (2018YFB0605804).

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Correspondence to Zihe Pan or Fangqin Cheng.

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Wang, B., Pan, Z., Cheng, H. et al. CO2 sequestration: high conversion of gypsum into CaCO3 by ultrasonic carbonation. Environ Chem Lett 18, 1369–1377 (2020). https://doi.org/10.1007/s10311-020-00997-9

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  • DOI: https://doi.org/10.1007/s10311-020-00997-9

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