Radiolysis of aqueous phenol solutions with nanoparticles. 1. Phenol degradation and TOC removal in solutions containing TiO2 induced by UV, gamma-ray and electron beams.
Aqueous phenol solutions containing TiO(2) nanoparticles were irradiated with ultraviolet (UV), gamma-ray and electron beams. Organic compounds were fully removed by each type of radiation in the presence of the particles. The absorbed energy of the ionizing radiation (gamma-ray and electron beams) needed for removal was much lower than that of UV photocatalysis. Phenol was decomposed by the ionizing radiation in the absence of the nanoparticles and the addition of TiO(2) had no significant effect on phenol decomposition rate. Instead, total organic carbon (TOC) removal using the ionizing radiation was accelerated drastically by TiO(2). It is suggested that TiO(2) particles affect the intermediate compounds produced through the decomposition of phenol. The amount of removed TOC per absorbed energy were compared in the absence and the presence of TiO(2) nanoparticles. Radiolysis with the nanoparticles showed consistently high rate and high efficiency of TOC removal.
Chitose
Norihisa
N
Central Research Institute, Naka Research Center, Mitsubishi Materials Corporation, 1002-14 Mukohyama, Naka-machi, Naka-gun, Ibaraki 311-0102, Japan. chitose@mmc.co.jp
Ueta
Shinzo
S
Seino
Satoshi
S
Yamamoto
Takao A
TA
D000042:Absorption; D004396:Coloring Agents / Q000737:chemistry*; D004583:Electrons; D010636:Phenols / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
D004396:Coloring Agents; D010636:Phenols; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D014025:Titanium