3期 孙奉玉等:二氧化钛的尺寸与光催化活性的关 氢反应,发现锐钛矿型和金红石型TD2的晶粒尺寸分别减小到小于约10m和约20mm的 范围时,光催化活性随晶粒尺寸的减小由平缓变为陡峭升高!虽然体系不尽相同但Anpo 的实验结果和我们的实验结果以及由此得到的看法相一致 在焙烧温度高于73K时,由于半导体晶粒的增大和相变产生的金红石相的增多,导致了 TD2光催化活性的逐渐降低,并最终几乎完全失去了活性 参考文献 1孙奉玉,吴鸣,李文钊等催化学报,1998,19121 2 A M, Shima T, Kodama S et al J Phys Chen, 1987, 91: 4305 3李新勇[博士学位论文↓兰州:中国科学院兰州化学物理研究所,1996168,97 4 Giuseppe P, L angford C, V ichova J et al J Photochen P hotobiol A: Chen, 1993, 75: 67 5 Lee w, Gao YM, Dw ight K et al M ater Res B ull, 1992, 27: 685 6 Ko m ann C, Bahnam ann D W, Hofm annM R. J PIs Chen, 1988, 92: 5196 7 Serpone N, L aw less D, Khairutd inov R. J Phys Chen, 1995, 99: 16646 8 Brus L. A pp/ PhysA, 1991, 53: 465 9 Weller H, Koch U, GutierrezM et al J Phys Chen, 1984, 88: 649 10 Hofm annA. Mills G. YeeH et al J Phvs Chen. 1992. 96: 5546 I1 Hoffm ann A J, Yee H, M ills G et al J Phys Chen, 1992, 96: 5540 RELATONSH IP BETW EEN CRY STALL ITE S IZE AND PHOTOCATALYTIC ACTⅣ TY OF TTANIUM DOXDE Sun Fengyu, WuM ing, L iW enzhao, L iX inyong, Gu W anzhen, W ang Fudong d alian Institu te df Chen ical Physics, T he Chinese A cadeny of Sciences, D alian 116023) Abstract Some T o2 nanoparticle sam p les w ith size range from 10.8 nm to 81.7 nm were p rep ared by sol-gel m ethod w ith Ti(OBu)4 as the precursor. The influ- ence of the p reparat on conditions on the size and the cry stalline phase of the T O2 cry stallite w as stud ied by m eans of X-ray d iffract ion(XRD )techn ique, and the op tical p roperties of the To2 sam p les were character ized by d infuse re- flectance spectro scopy(DRS) and fluo re scence spectro scopy (FS).Quantum size effect w as observed for the t o 2 sam p les w ith cry stallite size less than ca 16 nm w hich was detem ined by drs and fs these t o2 sam p les were also per- fo m ed as a pho to ca taly st in degradation of phenol In the size range 10 nm 30 nm, the pho to ca taly t ic act iv ity increases drastically w ith the decreasing of the crystallite size, ind icat ing that quantum size effect p lays a very m portant ro le in m p rov ing the pho tocataly t ic act ity of the T o2 sam p les w ith m all crystallite sIze Key words T itan ium dioxide, Crystallite size, Q uantum size effect, Pheno l Pho tocataly sis, Degradation (Ed wwQ) C1995-2004 Tsinghua Tongfang Optical Disc Co, Ltd. All rights reserved.氢反应, 发现锐钛矿型和金红石型 T iO 2 的晶粒尺寸分别减小到小于约 10 nm 和约 20 nm 的 范围时, 光催化活性随晶粒尺寸的减小由平缓变为陡峭升高[ 2 ] . 虽然体系不尽相同, 但A npo 的实验结果和我们的实验结果以及由此得到的看法相一致. 在焙烧温度高于 773 K 时, 由于半导体晶粒的增大和相变产生的金红石相的增多, 导致了 T iO 2 光催化活性的逐渐降低, 并最终几乎完全失去了活性. 参 考 文 献 1 孙奉玉, 吴鸣, 李文钊 等. 催化学报, 1998, 19: 121 2 A npo M , Sh im a T , Kodam a S et al. J P hy s Chem , 1987, 91: 4305 3 李新勇. [博士学位论文]. 兰州: 中国科学院兰州化学物理研究所, 1996. 168; 97 4 Giuseppe P, L angfo rd C, V ichova J et al. J P hotochem P hotobiol A : Chem , 1993, 75: 67 5 L eeW , Gao Y2M , Dw igh t K et al. M ater R es B u ll, 1992, 27: 685 6 Ko rm ann C, Bahnem ann D W , Hoffm ann M R. J P hy s Chem , 1988, 92: 5196 7 Serpone N , L aw less D , Khairutdinov R. J P hy s Chem , 1995, 99: 16646 8 B rus L. A pp l P hy s A , 1991, 53: 465 9 W eller H , Koch U , GutierrezM et al. J P hy s Chem , 1984, 88: 649 10 Hoffm ann A J, M ills G, Yee H et al. J P hy s Chem , 1992, 96: 5546 11 Hoffm ann A J, Yee H , M ills G et al. J P hy s Chem , 1992, 96: 5540 RELATIONSH IP BETW EEN CRY STALL ITE SIZE AND PHOTOCATALY TIC ACTIV ITY OF TITAN IUM D IOX ID E Sun Fengyu, W u M ing, L iW enzhao, L i X inyong, Gu W anzhen, W ang Fudong (D alian Institu te of Chem ical P hy sics, T he Ch inese A cad em y of S ciences, D alian 116023) Abstract Som e T iO 2 nanoparticle sam p les w ith size range from 1018 nm to 8117 nm w ere p repared by so l2gelm ethod w ith T i(OBu) 4 as the p recu rso r. T he influ2 ence of the p reparation condition s on the size and the crystalline phase of the T iO 2 crystallite w as studied by m ean s of X2ray diffraction (XRD ) techn ique, and the op tical p roperties of the T iO 2 sam p les w ere characterized by diffu se re2 flectance spectro scopy (DR S) and fluo rescence spectro scopy (FS). Q uan tum size effect w as ob served fo r the T iO 2 sam p les w ith crystallite size less than ca. 16 nm w h ich w as determ ined by DR S and FS. T hese T iO 2 sam p les w ere also per2 fo rm ed as a pho tocatalyst in degradation of pheno l. In the size range 10 nm～ 30 nm , the pho tocatalytic activity increases drastically w ith the decreasing of the crystallite size, indicating that quan tum size effect p lays a very im po rtan t ro le in im p roving the pho tocatalytic activity of the T iO 2 sam p les w ith sm all crystallite size. Key words T itan ium diox ide, C rystallite size, Q uan tum size effect, Pheno l, Pho tocatalysis, D egradation (Ed WW Q ) 3 期 孙奉玉 等: 二氧化钛的尺寸与光催化活性的关系 332 © 1995-2004 Tsinghua Tongfang Optical Disc Co., Ltd. All rights reserved