Studi pengaruh penambahan nanographen platelets dan perak terhadap peningkatan aktivitas photo-, sono-, sonophoto- catalytic dari Fe3O4/CuO/TiO2 nanocomposites = Study of influence of the addition nanographene platetlets and silver on improve photo-, sono-, sonophoto-catalytic of Fe3O4/CuO/TiO2 nanocomposites