Is there a nonliving (wood does not count) substance or process that accretes a solid material by withdrawing carbon from the air, in a manner analogous to calcium carbonate being accreted from seawater in biorock/seacrete?
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1$\begingroup$ The alteration of concrete is an example. $\endgroup$– KarlSep 25, 2022 at 20:02
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1 Answer
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There is no carbon in the air. Air contains some carbon dioxide, but carbon is not carbon dioxide. Carbon is a solid stuff. Carbon dioxide is a gas. Carbon dioxide can be removed from air by bubbling in a suspension of (insoluble) calcium carbonate in water. The reaction occurs according to the equation : $$\ce{CaCO3 + CO2 + H2O -> Ca^{2+} + 2 HCO3^-}$$
