Maredan natural clay is one of the natural clay sources from Desa Maredan, Kecamatan Tualang, Kabupaten Siak, Provinsi Riau. Previous research had successfully demonstrated that Maredan natural clay has the potential to be applied as an adsorbent for various adsorbates, particularly heavy metal ions such as lead(II) ions. The adsorption capacity of the clay can be enhanced through activation. C…