Novel immobilization of titanium dioxide (TiO2) on the fluidizing carrier and its application to the degradation of azo-dye.
A photocatalyst was prepared by attaching TiO(2) powder (diameter, 50nm) in the sol state to fluidizing spherical ceramic carriers using a silicon binder. A high initial photocatalytic activity and strong attachment was obtained at a sintering temperature of 500 degrees C. An azo-dye (Orange-G) was used as the test contaminant to examine the photocatalytic effect of the new photocatalyst. The initial pseudo-first order degradation rate constant for Orange-G was 0.11min(-1). However, the photocatalytic activity doubled when boric acid was added to the silicon binder at a B to Si ratio of 106.5%. When sodium ethoxide was added to the silicon binder at a sodium ion to Si ratio of 15.0%, as much as 80% of the initial photocatalytic activity was maintained after the photocatalyst had been agitated at 180rpm for 300min. Adding both boric acid at a B/Si ratio of 106.5% and sodium ethoxide at a Na/Si ratio of 15% increased the photocatalytic activity and stability by three and four times, respectively.
Kwon
Jung Mi
JM
Korea Research Institute of Chemical Technology, Korea.
Kim
Yong Hwan
YH
Song
Bong Keun
BK
Yeom
Sung Ho
SH
Kim
Beom Soo
BS
Im
Jeong Bin
JB
D001391:Azo Compounds / Q000737:chemistry*; D001888:Boric Acids; D002384:Catalysis; D002516:Ceramics / Q000737:chemistry; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D000431:Ethanol / Q000031:analogs & derivatives; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D015394:Molecular Structure; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
D001391:Azo Compounds; D001888:Boric Acids; C098088:sodium ethoxide; C009495:titanium dioxide; D000431:Ethanol; D014025:Titanium; C032688:boric acid