Photocatalytic removal of cadmium (II) and lead (II) from simulated wastewater at continuous and batch system

Document Type : Original Article

Authors
Sajad Rahimi 1
Mohammad Ahmadian 1
Reza Barati 2
Nader Yousefi 3
Seyedeh Parvin Moussavi 4
Kamran Rahimi 5
Sohyla Reshadat 1
Seyed Ramin Ghasemi 1
Nader Rajabi Gilan 1
Ali Fatehizadeh 6
1 Social Development & Health Promotion Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
2 Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran
3 Departments of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
4 Environmental Health Engineering, Faculty of Public Health, International Branch of Shahid Sadoughi University of Medical Sciences, Yazd, Iran
5 Geophysics, Hamedan Branch, Islamic Azad University, Hamedan, Iran
6 Environment Research Center, Isfahan University of Medical Sciences (IUMS), and Department of Environmental Health Engineering, School of Health, Student Research Center, IUMS, Isfahan, Iran
10.4103/2277-9183.139756
Abstract
Aims: The aim of this study was to evaluate the photocatalytic processes for cadmium (Cd 2+ ) and lead (Pb 2+ ) removal at continuous and batch system. Materials and Methods: This study was performed at laboratory scale. The reactors used in this study consisted of three parts: Ultraviolet (UV) source, reaction cell, and mixing chamber. The experiments were carried out in a batch and continuous reactor for synthetic wastewater. The concentration of Cd 2+ and Pb 2+ was constant (25 mg/L) in all experiments and effect of titanium dioxide (TiO 2 ) dose, pH, and air dispersion was investigated on the removal efficiency. Results: The results showed that with increasing TiO 2 dose and pH, the cadmium and lead removal increase. The maximum removal of cadmium and lead was obtained in TiO 2 dose 0.9 g/L and pH: 11 that were equal to 99.8 and 99.2% respectively. Furthermore, when air dispersion increased, the removal efficiency increased; while in the air dispersion 2 cm 3 /L the removal efficiency was maximum (88 and 93.2% at the contact time 56 min for Cd 2+ and Pb 2+ , respectively). Conclusion: According to these results the TiO 2 has been considered as photocatalyst is the separable and recyclable, so UV/TiO 2 process is an environment friendly process for toxic metal removal.
Keywords
Advanced oxidation
batch and continuous system
heavy metals
titanium dioxide nanoparticle
International Journal of Environmental Health Engineering (IJEHE)
Volume 3, August
Summer 2014
Pages 90-94

  • Receive Date 02 February 2023