Research has been carried out on the modification and characterization of Polyvinyl Alcohol/Alginate/Glutaraldehyde (PVA/Alg/GA) impregnated with activated carbon using CaCO3 into cryogel as a Cu(II) metal ion adsorbent. This research aims to determine the morphology of PVA/Alg/GA cryogel containing activated carbon, the effect of pH on the absorption of Cu(II) metal ions and the effect of H2SO…