Effect of nanoabsorbent on removal of cadmium heavy metal from water and study of maize growth

The effect of magnetic nanoparticles Fe_3 O_4 on removal of cadmium heavy metal from aqueous solution and then plant treatment with this solution and effect on growth and some physiological responses of maize plant were studied. Three concentrations of cadmium (10, 80 and 220 mg) as cadmium chloride and a constant concentration of nano-adsorbent Fe_3 O_4 (4 g/l) were used. Cadmium heavy metal in high concentrations is toxic for maize plant and the magnetic nanoparticle successfully absorbs the cadmium metal up to 99 percent and reduces its toxic effects. Increasing of cadmium concentration, decreased length and fresh weight of maize but proline, antioxidant and the heavy metal of plant increase. Magnetic nanoparticles treatment Fe_3 O_4 showed a significant reduction in cadmium concentrations in the maize plant and significant amelioration of growth and physiological characteristics. Irrigation of maize with treated water by nanoabsorbent and optimum growth and physiological characteristics showed that this method is ideal for refining of agricultural water.