Briefly, the 100 ml solution of Rhoda mine 6G of (0.0596 × 10 -3 M) conc. were prepared separately in a 250 ml beaker using double distilled water. Accurately weighed 5.0 mg iron oxide nanoparticles (100mg/L) were added to the dye solutions (50 ml in part); and were sonicated for 10 min to reach adsorption-desorption equilibrium in dark condition, and then, 1.0 ml of solution was withdrawn for initial measurement of absorption before exposing the solution to sunlight.