Feasibility of Macroporous CeO2 Photocatalysts for Removal of Lead Ions from Water

Takuya Nozaki (Department of Chemical Science and Engineering, National Institute of Technology, Tokyo College, Tokyo)
Ryo Shoji (Department of Chemical Science and Engineering, National Institute of Technology, Tokyo College, Tokyo)
Yasukazu Kobayashi (Materials Research Center for Element Strategy, Tokyo Institute of Technology, Kanagawa)
Kazunori Sato (Department of Materials Science and Technology, Nagaoka University of Technology, Niigata)

Bulletin of Chemical Reaction Engineering & Catalysis
2018: BCREC Volume 13 Issue 2 Year 2018 (August 2018)

Removal of lead ions from water was conducted by a coupling approach of adsorption and photoelectrodeposition over a macroporous CeO2 photocatalyst loaded with ZnO. The photocatalyst was prepared by the hard template method and the impregnation method. The various size of silica spheres (0.05-0.4 µm) were used as a template for the photocatalyst, and the highest BET surface area (73.8 m2/g) was given in the sample prepared with the smallest silica sphere (0.05 µm). In the removal of lead ions, the porous sample showed a large amount of removal of lead ions. In addition, the ZnO loaded catalysts showed a larger amount of removal for lead ions than an unloaded catalyst under the UV light irradiation. In the reaction, since zinc ions were simultaneously dissolved to the solution, it was suggested that this reaction was the ion-exchange reaction between lead ions and zinc ions and was promoted by the UV light irradiation.