Photocatalytic Degradation of Pb(II) By Using Different Semiconducting Materials

Abstract

A various processes are used for removal of metals from industrial wastewaters. The relatively newest technology of which is photocatalysis. The removal of hazardous metals Pb (II) by using semiconducting materials as Titanium dioxide, Zinc oxide as well as Cadmium sulphide from wastewater. In this study, photocatalysis processes had been employed for the removal of lead at different pH from 2 to 11, the detention time was kept constant (180 min). Results indicated that the removal were 98.8% for Pb (II) at pH 6 and shows optimum efficiencies. These results were all obtained best in the use of UV irradiation and 0.6 g/L TiO2. These results are considered for all industrial treatment plants which have experienced the problem of this hazardous metal in their effluents. The kinetic studies were used to interpret the data of this investigated system. The semiconducting materials TiO2 had higher degradation capacity than the ZnO and CdS. Results indicate that Lagergrin second order fits better for the removal of Pb (II).