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https://cris.pucp.edu.pe/en/publications/nitrate-removal-using-natural-clays-modified-by-acid-thermoactiva/ Nitrate removal using natural clays modified by acid thermoactivation - Pontificia Universidad... nitrate removal natural clays using modified acid https://pure.ikiam.edu.ec/en/publications/iron-doped-natural-clays-low-cost-inorganic-adsorbents-for-phosph/ Iron-doped natural clays: Low-cost inorganic adsorbents for phosphate recovering from simulated... natural clays low cost iron inorganic adsorbents