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Background and purpose: Lead is a toxic compound which causes variety of health problems in water environments. This study investigated the efficiency of Tio2/Sio2 hybrid nanoparticles in removal of lead from paint industry effluents. Materials and methods: This experimental study was done in samples of synthetic and real wastewater from Binalood paint factory within six months. The chemical quality of crude sample and its lead was determined and then the influence of PH, absorbent amount and time on the removal of lead was evaluated. Then, the optimal conditions for each of these parameters were determined. The same experiments were done for samples of real wastewater. In order to understand the process of adsorption, kinetics of absorption isotherms equilibrium was also studied. SPSS ver.16 was used to analyze the data. Results: The highest percentage of lead absorption was observed at pH=9, Retention time of 120 minutes, absorbent amount of 0.5g for synthetic solution with removal efficiency of 99.99% and for synthetic solution with the efficiency of 95.56%.The findings revealed that the removal of lead followed the freundlich isotherm (R2=9822%) and the second order synthetic model (R2=9994%). Conclusion: Hybrid nanoparticles had a remarkable effect on the removal of lead (99.99%), so it could be used as an efficient method in removal of lead from industrial effluents.

Keywords: Heavy metal, lead, absorption

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