0 0 50-54 Water Vol. Purification 0, No. Technology, 0,,. 50090. 0040 TiO TiO TiO + [] + + TiO TiO TiO TiO TiO TiO TiO TiO TU99 B 009-077 0 0-0050-05 Degradation of Methyl Orange with Metal Ion Modified TiO Hydrosol under Visible Light Irradiation Chen Chao, Long Mingce, Cai Weimin,, Zhou Mulin, Zhou Baoxue, (.School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 50090, China;.School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 0040, China) Abstract TiO was synthesized via precipitation-gelation method by using tetrabutyl titanate as reactants. Effect of synthesis method on photocatalytic activity of TiO was studied. TiO was used to prepare thin film. Metal ions ( +, +, and + ) were used to modify TiO, and the corresponding photoabsorption performance was analyzed. ordination compounds were formed between metal ion and TiO. Effect of metal ion under visible light photocatalytic activity of TiO in degradation of methyl orange was studied. The results show that metal ion modified TiO has higher photocatalytic activity on methyl orange. Degradation of methyl orange with TiO and metal ion modified TiO is a self-catalysis reaction. Key words TiO metal ion autocatalysis visible light methyl orange TiO [6] TiO TiO [-] [7] TiO [4-5] TiO TiO TiO - TiO TiO TiO [ ] [ ] 09070 [ ] 0-5474747 (98-) TiO E-mail chenchao0456@yahoo.com.cn [ ] 0-5474754 E-mail long_mc@sjtu.edu.cn - 50 - [8] TiO. ev %~5 %
WATER PURIFICATION TECHNOLOGY April 5th, 0.4 TiO TiO UV-0PC UNICO [0] TiO TiO TiO HNO 00 W TiO TiO TiO >40 nm TiO 0 ml 0 mg / L -. TiO 6 ml 40 ml 60 ml 75~80 C. TiO 45 min TiO ml TiO ml 5 mol / L 0 ml 0 ml TiO 75~80 C 4 h [] TiO 4. ml TiO 0 ml 0 min 50 ml.8 ml 5 mol / L TiO 4 h. TiO ml 0 ml TiO Tab. Species and ncentrations of Metal Salts NO Cl (NO ) (NO ) (NO ) / mol L - / mol L - / mol L - / mol L - / mol L - 0.05 8 0.05 8 0.0 5 0.04 0.04. TiO 0. 0 0 60 90 0 Fig. Effect of Different Kinds of TiO Hydrosols on Methyl Orange Degradation 0 min 0. mol / L NaOH TiO ph=.4 TiO TiO TiO C / C0.0 0.8 0.6 0.4 TiO ml TiO - 5 -
. E=hc / λ E g = 4 / λ Fig. Digital Picture of TiO Hydrosol 0 F / R 00 40 80 0 60 400 440 00 400 600 800 4 TiO Fig.4 Uv-vis Absorption Spectra of TiO Hydrosol and Magnified Spectra Orange Degradation Fig. Dispersion of Water Vapor on Different Kinds of Glass Slides. TiO TiO TiO - Kubelka- Munk F(R ) 0 4 4 F / R 00 00 400 500 TiO 5 4 Fig.5 Uv-vis Absorption Spectra of Metal lon Solutions TiO 8 4 5 nm TiO 00~50 nm E h c λ Bordiga [] + 5 nm 4 nm + TiO E g TiO.6 ev 5 TiO - 5 -
WATER PURIFICATION TECHNOLOGY April 5th, 0 TiO.0 00~5 nm Tab. Absorption Peaks of Metal Ion Modified TiO Hydrosols under Wavelength Ranging from 00 to 5 nm + /nm TiO 6 TiO 60 min 95 % 0. TiO TiO 0.0 TiO dye + hv dye* 0 5 dye* + TiO dye + + TiO e - 4 TiO e - + O TiO + O - 5 O - + TiO e - +H + H O + TiO 6 O - + H+ O + H O + 06 7 7 H O + TiO e - OH + OH - + TiO 8 dye + + O - or OH 9 TiO TiO O 0.0 TiO 0.5 O TiO TiO 0.0 TiO 0.05 [0] dye* + TiO -OH(M) n+ dye + +TiO + M n+ + OH 0 + 0 40 80 0 60 [] ml TiO TiO Orange Degradation TiO C / C0 / mg L - min - 0.8 0.6 0.4 0.00 6 TiO Fig. Effect of TiO Hydrosols on Methyl Orange Degradation 0 40 80 0 TiO 7 TiO Fig. Reaction Rate of TiO Hydrosols on Methyl 6 7 TiO TiO TiO 7 + + + TiO TiO TiO - 5 -
0 mg/l 0 ml ml TiO TiO TiO TiO degradation of azo dye using Ln n + -TiO neering B,005,7():5-.. 7 Xie, Y, Yuan, C. Transparent TiO sol nanocrystallites mediated homogeneous-like photocatalytic reaction and recycling process[j]. J. Mater. sci.,005,40(4):675-68. 8 Xie, Y, Yuan, C, Li, X. Photosensitized and photocatalyzed sol in aqueous solution under visible light irradiation[j]. Materials Bcience and Engi - 9 Chen C, Li X, Ma W, et al. Effect of Transition Metal Ions on the TiO -Assisted Photodegradation of Dyes under Visible Irradiation: A Probe for the Interfacial Electron Transfer Process and Reaction Mechanism [J]. Journal of Physical Chemistry,00,06 ():,,. TiO [J].,005,4():59-6. 8-4.,,,. N F TiO 0 Wang J, Liu Z, Cai, R. A new role for + in TiO : Accelerated photodegradation of dyes under visible light [J]. Envi- [J].,009,8 (4):55-59. ronmental Science and Technology, 008,4(5):5759-5764.. TiO [D]. :, Wang J-y, Yu J-x., Liu Z.-h, et al. A simple new way to prepare 009. anatase TiO with high photocatalytic activity. Semicond 4 Hu, X, Li, G, Yu, J C. Design, Fabrication, and Modification of [J]. Semiconductor Science and Technology, 005,0(8):L6-L9. Nanostructured Semiconductor Materials for Environmental and Bordiga, S, Buzzoni, R, Geobaldo, F, et al. Structure and Reactivity of Framework and Extraframework Iron in -Silicalite as In- Energy Applications[J]. Langmuir,00,6(5):0-09. 5 Linsebigler, A. L, Lu, G. Yates, J T. Photocatalysis on TiO surfaces: principles, mechanisms, and selected results[j]. Chemical vestigated by Spectroscopic and Physicochemical Methods [J]. Journal of Catalysis, 996,58():486-50. Reviews, 995,95():75-758. Sun Y, Brown G. M, Moyer B. A. TiO mediated photooxidation of 6 Xie, Y, Yuan, C. Photocatalytic and photoelectrochemical performance of crystallized titanium dioxide sol with neodymium ion trichloroethylene and toluene dissolved in fluorocarbon solvents [J]. Chemosphere,995,(6):575-584. modification[j]. J. Chem. Technol. Biotechnol.,005,80(8):954-96....... 65 5, " 65 "... - 54 -...