Pb(¶) removal by CeO2-TiO2 aqueous environment
Teoh Wah Tzu,Kazunori Sato
Sol-gel synthesize of CeO2 (0 to 0.15 mol%) doped TiO2 was used for Pb(¶) removal by photocatalytic activity. Photocatalyst is known for its capability to remove heavy metal ion. TiO2 is low cost and environmental friendly photocatalyst. CeO2 was able to enhance photocatalyst activity by preventing recombination of photo-irradiated electrons and holes.
In this research, we found that CeO2-TiO2 had higher Pb(¶) removal than TiO2 fabricated. CeO2-TiO2 could remove Pb(II) by photocatalytic effect and 10 mol%CeO2-TiO2 calcined by 873 K has highest performance in this research. This result indicated that CeO2 was well dispersed in TiO2 anatase phase, therefore CeO2 could inhibited hole-electron recombination. Doped CeO2 could shift surface potential to negatively-charged, Pb(¶) was accumulated to CeO2-TiO2 surface by adsorption too.
The results of surface analysis of CeO2-TiO2 after Pb(¶) removal test showed that lead oxide existed on surface and CeO2-TiO2 after Pb(¶) removal test changed black. That indicate Pb(¶) was reduced to PbO2 by photocatalyst effect
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