title: Novel immobilization of titanium dioxide (TiO2) on the fluidizing carrier and its application to the degradation of azo-dye.
abstract: 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.
authors.affiliation: Korea Research Institute of Chemical Technology, Korea.
authors.forename: Jung Mi
authors.initials: JM
authors.lastname: Kwon
authors.forename: Yong Hwan
authors.initials: YH
authors.lastname: Kim
authors.forename: Bong Keun
authors.initials: BK
authors.lastname: Song
authors.forename: Sung Ho
authors.initials: SH
authors.lastname: Yeom
authors.forename: Beom Soo
authors.initials: BS
authors.lastname: Kim
authors.forename: Jeong Bin
authors.initials: JB
authors.lastname: Im
mesh_terms: 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
chemical_list: D001391:Azo Compounds; D001888:Boric Acids; C098088:sodium ethoxide; C009495:titanium dioxide; D000431:Ethanol; D014025:Titanium; C032688:boric acid