Researchers have discovered that a by-product of splitting seawater to make hydrogen -- by itself not a bad thing -- might be used as sand to make concrete and in the process absorb CO2 from the atmosphere.
Haven't seen a downside to this process yet.
Judge for yourself -- read the article:
Carbon-Negative Building Material Made From Seawater and CO2
The material can hold up to half its weight in trapped CO2 and replace sand in concrete.(That's what I said.)
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"During this electrochemical process [seawater splitting], mineral deposits of calcium carbonate (CaCO3) and magnesium hydroxide (Mg(OH)2) also slowly build up at the cathode – especially when there is a high amount of dissolved CO2 present in the water. These deposits have generally been dismissed as an energy-intensive byproduct by those who produce green hydrogen. However, some believe that these minerals could have untapped potential for carbon sequestration."
" “These factors collectively influence the precipitation process in a highly complex manner, as it strongly depends on local pH, ionic availability and type, temperature and other variables,” [lead author Dr. Alessandro] Rotta Loria explained. “Through our work, we have developed an understanding of how to simultaneously control all these variables to achieve mineral precipitations with desired properties while also optimizing the energy input required to obtain the intended outcomes.” "
"Depending on these factors and the resultant ratio of minerals produced, the deposited material can trap approximately half its weight in CO2."The diagram below shows different ways to do the splitting process.
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