title: [Synthesis, characterization and photo degradation application for dye-rhodamine B of nano-iron oxide/bentonite].
abstract: The iron oxide/bentonite was prepared through a reaction of a solution of OH-Fe salt with bentonite clay dispersion. BET, XRD an d HRTEM were used t o study i ts surface area, microstructure, and average particle size. The iron oxide/bentonite nano composite was developed as the heterogeneous catalyst for successful discoloration and mineralization of dye rhodamine B And the effects of solution pH, H2O2 molar concentration, catalyst loading and initial rhodamine B concentration were studied in detail by photometric method. The process of degradation was traced by UV-Visible spectrum. Besides, the comparison between the heterogeneous photo-Fenton process and homogeneous photo-Fenton process was performed. The result shows that, it has large surface area and mainly consists of high catalytic activity alpha-Fe2O3. The discoloration ratio is up to 97% and the COD(Cr), removal ratio is 71% after 4 h in the presence of pH 3.0, 2.5 x 10(-5) mol x L(-1) rhodamine B 100 mL, 0.3 g x L(-1) catalyst, 10 mmol x L(-1) H2O2 and UV. The rhodamine B degradating speed of heterogeneous photo-Fenton process is much faster than that of homogeneous photo-Fenton process. The catalyst can be reused after being treated.
authors.affiliation: Key Lab of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.forename: Yi-min
authors.initials: YM
authors.lastname: Li
authors.forename: Li-hua
authors.initials: LH
authors.lastname: Wen
authors.forename: Ke-yong
authors.initials: KY
authors.lastname: Hou
authors.forename: Hai-yang
authors.initials: HY
authors.lastname: Li