Microbial Carbonation of Monocalcium Silicate.

Autor: Guzman MS; Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, United States., Iyer J; Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, United States., Kim P; Department of Materials Science & Engineering, Rutgers-The State University of New Jersey, Piscataway, New Jersey 08854, United States., Kopp D; Department of Materials Science & Engineering, Rutgers-The State University of New Jersey, Piscataway, New Jersey 08854, United States., Dong Z; Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, United States., Foroughi P; Department of Materials Science & Engineering, Rutgers-The State University of New Jersey, Piscataway, New Jersey 08854, United States., Yung MC; Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, United States., Riman RE; Department of Materials Science & Engineering, Rutgers-The State University of New Jersey, Piscataway, New Jersey 08854, United States., Jiao Y; Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, United States.
Jazyk: angličtina
Zdroj: ACS omega [ACS Omega] 2022 Apr 06; Vol. 7 (15), pp. 12524-12535. Date of Electronic Publication: 2022 Apr 06 (Print Publication: 2022).
DOI: 10.1021/acsomega.1c05264
Abstrakt: Biocement formed through microbially induced calcium carbonate precipitation (MICP) is an emerging biotechnology focused on reducing the environmental impact of concrete production. In this system, CO 2 species are provided via ureolysis by Sporosarcina pasteurii ( S. pasteurii ) to carbonate monocalcium silicate for MICP. This is one of the first studies of its kind that uses a solid-state calcium source, while prior work has used highly soluble forms. Our study focuses on microbial physiological, chemical thermodynamic, and kinetic studies of MICP. Monocalcium silicate incongruently dissolves to form soluble calcium, which must be coupled with CO 2 release to form calcium carbonate. Chemical kinetic modeling shows that calcium solubility is the rate-limiting step, but the addition of organic acids significantly increases the solubility, enabling extensive carbonation to proceed up to 37 mol %. The microbial urease activity by S. pasteurii is active up to pH 11, 70 °C, and 1 mol L -1 CaCl 2 , producing calcite as a means of solidification. Cell-free extracts are also effective albeit less robust at extreme pH, producing calcite with different physical properties. Together, these data help determine the chemical, biological, and thermodynamic parameters critical for scaling microbial carbonation of monocalcium silicate to high-density cement and concrete.
Competing Interests: The authors declare no competing financial interest.
(© 2022 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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