Photocatalytic paper from colloidal TiO(2)--fact or fantasy.
Photocatalytic paper encompasses a range of materials based on paper and nonwoven fabrics which performs a function based on the light-activated catalytic activity of colloidal TiO(2). The literature describing photocatalytic paper is surveyed, including mechanisms, applications, limitations and future opportunities. The technology is in its infancy with less than 10 patents and as many scientific publications appearing over the last decade. The main applications described are the destruction of organic molecules (mineralization) and photo-disinfection (sterilization). These disclosures build upon a much larger literature describing photochemical properties of TiO(2) both supported on non-cellulose substrates or simply as suspended particles in water or air. Current photocatalytic paper developments include methods to fix TiO(2) to cellulose substrates to minimize photochemical damage to the paper. Another theme is the use of multiple approaches, such as zeolites, for enhanced mineralization, and metals, such as silver and copper, for enhanced photocatalytic disinfection.
Pelton
Robert
R
McMaster University, Department of Chemical Engineering, 1280 Main St. W., Hamilton, Ontario, Canada L8S 4L7. peltonrh@mcmaster.ca
Geng
Xinglian
X
Brook
Michael
M
D002384:Catalysis; D002627:Chemistry, Physical / Q000379:methods; D003102:Colloids / Q000737:chemistry; D004203:Disinfection / Q000295:instrumentation / Q000379:methods; D006863:Hydrogen-Ion Concentration; D008027:Light; D008956:Models, Chemical; D010209:Paper; D010777:Photochemistry / Q000295:instrumentation* / Q000379:methods; D013242:Sterilization / Q000295:instrumentation / Q000379:methods; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays
D003102:Colloids; C009495:titanium dioxide; D014025:Titanium