以纳米四针状氧化锌晶须(T-ZnOw)为光催化剂,以甲基橙为染料模型化合物,研究了T-ZnOw的光催化氧化降解性能.考察了甲基橙溶液的初始浓度、催化剂用量和粒径等因素对光催化氧化降解反应的影响.研究结果表明,纳米T-ZnOw光催化氧化降解甲基橙的反应遵循一级反应动力学规律;光催化剂纳米T-ZnOw的最佳用量为2g/L,此时经60min光催化降解后,甲基橙溶液的色度剩余率仅为8%;T-ZnOw粒子直径越小,光催化活性越高,效果越好.对比实验和重复实验结果表明,纳米T-ZnOw的光催化氧化降解效果比纳米TiO2和普通球形纳米ZnO粉体更好,是一种高效、长寿的光催化剂材料.
参考文献
[1] | Carey J H;Lawrence J;Tosine H M .Photodechlorination of PCBs in the presence of TiO2 in aqueous suspensions[J].Bulletin of Environmental Contamination and Toxicology,1976,16:697-700. |
[2] | Keiichi Tanaka;Mario F;V Capule;Teruaki Hisanaga .Effect of crystallinity of TiO2 on its photocatalytic action[J].Chemical Physics Leters,1991,187(1-2):73-76. |
[3] | Chen L C;Chou T C .Photodecolorization of Methyl Orange Using Silver Ion Modified TiO2 as Photocatalyst[J].Industrial and Engineering Chemistry Research,1994,33(06):1436-1443. |
[4] | Choi W;Hoffmann R .Kinetics and Mechanism of CCh Photoreductive Degradation on TiO2:The Role of Trichloromethyl Radical and Dichlorocarbene[J].Journal of Physical Chemistry,1996,100(06):2161-2169. |
[5] | Paz Y;Heller A .Photo-oxidatively self-cleaning transparent titanium dioxide films on soda lime glass:The deleterious efect of sodium contamination and its prevention[J].Journal of Materials Research,1997,12(10):2759-2766. |
[6] | M. Machida;K. Norimoto .The effect of SiO2 addition in super-hydrophilic property of TiO2 photocatalyst[J].Journal of Materials Science,1999(11):2569-2574. |
[7] | Toshiya Watanabe;Shigemichi Fukayama;Masahiro Miyauchi;Akira Fujishima;Kazuhito Hashimoto .Photocatalytic Activity and Photo-Induced Wettability Conversion of TiO_2 Thin Film Prepared by Sol-Gel Process on a Soda-Lime Glass[J].Journal of Sol-Gel Science and Technology,2000(1/3):71-76. |
[8] | Iwasaki M.;Kawada H.;Tada H.;Ito S.;Hara M. .Cobalt ion-doped TiO2 photocatalyst response to visible light[J].Journal of Colloid and Interface Science,2000(1):202-204. |
[9] | Tetsu Tatsuma;Shuichi Saitoh;Yoshihisa Ohko .TiO_2-WO_3 Photoelectrochemical Anticorrosion System with an Energy Storage Ability[J].Chemistry of Materials,2001(9):2838-2842. |
[10] | 周建萍,丘克强,傅万里,杨素文.纳米T-ZnOW的制备及其生长机理研究[J].功能材料与器件学报,2005(04):406-410. |
[11] | Bagnall DM.;Shen MY.;Zhu Z.;Goto T.;Yao T.;Chen YF. .Room temperature excitonic stimulated emission from zinc oxide epilayers grown by plasma-assisted MBE[J].Journal of Crystal Growth,1998(0):605-609. |
[12] | S. A. M. Lima;F. A. Sigoli;M. Jafelicci Jr;M. R. Davolos .Luminescent properties and lattice defects correlation on zinc oxide[J].International journal of inorganic materials,2001(7):749-754. |
[13] | Zhang J.;Yu WY.;Zhang LD. .Fabrication of semiconducting ZnO nanobelts using a halide source and their photoluminescence properties[J].Physics Letters, A,2002(2/3):276-281. |
[14] | Vanheusden K;Seager CH;Warren WL;Tallant DR;Caruso J;HampdenSmith MJ;Kodas TT .Green photoluminescence efficiency and free-carrier density in ZnO phosphor powders prepared by spray pyrolysis[J].Journal of Luminescence: An Interdisciplinary Journal of Research on Excited State Processes in Condensed Matter,1997(1):11-16. |
[15] | 尚汴卿,陆兆仁,袁琴华.纳米氧化锌晶体的制备与光催化性质[J].东华大学学报(自然科学版),2004(05):29-33. |
[16] | 傅献彩;沈文霞;姚天扬.物理化学[M].北京:高等教育出版社,1992:1008-1009. |
[17] | 吴润 .ZnO/Zn纳米晶须的热物理形成及其特征的研究[D].华中科技大学,2001. |
[18] | 井立强,徐自力,孙晓君,尚静,蔡伟民,杜尧国,傅宏刚.ZnO和TiO2粒子的光催化活性及其失活与再生[J].催化学报,2003(03):175-180. |
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