活性炭复合材料.pdf

?21?5?Vol.21 No.52 0 0 7?10?CHINESE JOURNAL OF MATERIALS RESEARCHOctober 2 0 0 7?TiO2/?(?350002)?,?TiO2/?.?,?,?,TiO2?TiO2?,?,?.?,?,TiO2/?,?,?TB332?1005-3093(2007)05-0506-05Characteristics of TiO2/activated carbon composites preparedby supercritical isopropanolCHEN XuerongHUANG BiaoJIANG Maosheng(College of Material Engineering,Fujian Agriculture and Forestry University,Fuzhou 350002)*Supported by National Natural Science Foundation of China No.30371140.Manuscript received November 13,2006;in revised form March 21,2007.*To whom correspondence should be addressed,Tel:(0591)87694115,Email:ABSTRACTThe supercritical treatment can be effective for preparing the photo-catalytic compositespossessing high synergetic effects of adsorption and photo-catalytic decomposition.When the synergeticeffects come into being,the pollutants can be adsorbed and decomposed effectively by the composites,thephoto-catalytic decomposition rate can be accelerated.The photo-catalytic activity of TiO2crystallitesimpels adsorbing of the pollutants by activated carbon(AC)on the surface of TiO2crystallites,thus theadsorbility of the AC adsorbent can be recovered,and the in-situ regeneration of the adsorbent is achieved.KEY WORDScomposites,supercritical isopropanol,TiO2/activated carbon composites,photo-catalytic activity,adsorptivity?1.?,?.?TiO2?,?,?24.TiO2?NOX?SOX?5,6.?,?.?,?TiO2?*?30371140?.2006?11?13?;2007?3?21?.?:?,?,?2.?TiO2?,?,?711.?TiO2?12,?TiO2?TiO2/?13.?,?;?TiO2?,TiO2?.?,?TiO2?.Courtecuisse V G?14,15?(RESS)?(GAS)?,?TiO2?.?TiO2/?,?.5?:?TiO2/?5075?:?TiO2/?5075?:?TiO2/?5071?1.1?(SCT)?.?5 mL,?200 MPa,?500?,?,?,?,?,?,?.?.?(?)?(?)?(?)?(?).?1 g?4 mL?,?1 h?,?,?TiO2?.?,?(AC)?ScTiO2?,?ScTiO2?.?4 g?15 mL?,?0.2 g?,?1 h?,?,?,?TiO2/?.?,?450,400,350,300?,?1 min?,?(Pc=5.37 MPa)?(Tc=235?).?450,400,350,300?,?,?250?.?Rigaku RINT2000?(Rigaku DenkiCo.,Inc.)?TiO2/?XRD?.1.2TiO2/?,?.?,?(UV)?.?(UV)?CO2?.?CO2?,CO2?,?.?,?,?,?,?,?,?UV?,?CO2?.?TiO2/?,?CO2?,?,?HCHO400 mg/L?,?.2?2.1TiO2?/?1?,?(SCT)?,?(101,2=25.2),?TiO2?TiO2?.?2?.?,?,?UV?,?,?.?,?,?.?CO2?1TiO2?/?X?A:?TiO2?Fig.1 XraydiffractogramsofScTiO2ACA:Anataseform crystallite?2?UV?HCHO?CO2?Fig.2 Changes in HCHO and CO2concentrationsagainst the treatment time before and afterUV irradiation over AC508?21?508?21?508?21?,?,?HCHO?CO2,HCHO?.?3?ScTiO2?.?,?,?CO2?,?ScTiO2?.?,?,?CO2?,?UV?ScTiO2?,HCHO?TiO2?,?CO2.?4?ScTiO2?.?,?,?TiO2?CO2?.?HCHO?CO2?ScTiO2?.?,?,?TiO2?,?TiO2?HCHO?,CO2?.?ScTiO2?TiO2?.?5?TiO2/?.?,?.UV?,?TiO2?,?ScTiO2?,?300 min?,?,?CO2,?CO2?,?CO2?.?,TiO2/?TiO2?.?3ScTiO2?UV?HCHO?CO2?Fig.3 Changes in HCHO and CO2concentrationsagainst the treatment time before and afterUV irradiation over ScTiO2granulesTiO2?1416.?,?TiO2?4?ScTiO2?UV?HCHO?CO2?Fig.4 Changes in HCHO and CO2concentrationsagainst the treatment time before and afterUV irradiation over a sample mixture of ACand ScTiO2granules?5TiO2/?UV?HCHO?CO2?Fig.5 Changes in HCHO and CO2concentrationsagainst the treatment time before and afterUV irradiation over ScTiO2/AC composite?1?Table 1 Supercritical and subcritical conditions ofisopropanol at various temperatures andpressuresTin bathReactortemperatureTemperaturePressureCondition/?/?/MPa2502258Subcritical30029512Supercritical35034516Supercritical40039520Supercritical45044523Supercritical5?:?TiO2/?5095?:?TiO2/?5095?:?TiO2/?509?,?,?,?,?.?250?,?(500 min?),?,?TiO2,?.?350,300?,?(290300 min?),?400?,?,(340 min?);?450?,?,(360 min?).?(?1),?TiO2,?.2.2TiO2?/?TiO2/?,?CO2?,?,?HCHO400 mg/L?,?,?5?,?,?TiO2/?(c)?,?.?,?TiO2?e,?h+.?e?h+?OH.?OH?,?CO2?H2O.?OH?,?TiO2?,?OH?,?.?,TiO2?TiO2?,?,?.3?TiO2?,?,?TiO2?,?TiO2?,?/?.?TiO2?/?.?TiO2?,?,?,?.?1G.Wieslander,D.Norb ack,E.Bj ornsson,C.Janson,G.Boman,Asthma and the indoor environment:thesignificance of emission of formaldehyde and volatileorganic compounds from newly painted indoor surfaces,Int.Arch Occup.Environ.Health.,69,115(1997)2F.Fujishima,K.Hashimoto,T.Watanabe,TiO2photo-catalysis fundamentals and applications,In:A Revolutionin Cleaning 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