采用溶胶-凝胶法制备了不同铕(Eu)掺杂量的TiO2纳米颗粒(Eu-TiO2),利用透射电镜(TEM),X射线光电子能谱(XPS),X射线衍射(XRD)及紫外可见漫反射(UV-Vis DRS)等方法对Eu-TiO2进行了物理特性的初步表征.结果表明:与未掺杂纳米TiO2比较,Eu-TiO2禁带宽度变窄,具有可见光光催化活性.在可见光下(λ≥420 nm)照射下,以光催化降解染料罗丹明B(Rho-damine B,RhB)为目标反应,探讨了Eu-TiO2不同制备条件对RhB降解光催化活性的影响,优化得到制备高活性Eu-TiO2最佳pH为3、掺杂比例(nEu/nTi)为0.05％、煅烧温度为500℃.研究了可见光照射下Eu-TiO2降解RhB和无色有机小分子水杨酸(SA)光催化反应条件及降解特性,RhB的12 h深度氧化矿化率为60.2％,SA的8h降解率达到100％.通过跟踪测定可见光下Eu-TiO2光催化反应过程中氧化物种的变化,研究了可见光激发Eu-TiO2光催化反应机理,表明其光催化反应主要涉及羟基自由基(·OH)历程.
参考文献
| [1] | Ying Yang;Xin-jun Li;Jun-tao Chen;Liang-yan Wang .Effect of doping mode on the photocatalytic activities of Mo/TiO_2[J].Journal of Photochemistry and Photobiology, A. Chemistry,2004(3):517-522. |
| [2] | Jeffrey C.-S. Wu;Chih-Hsien Chen .A visible-light response vanadium-doped titania nanocatalyst by sol–gel method[J].Journal of Photochemistry and Photobiology, A. Chemistry,2004(3):509-515. |
| [3] | Ping Yang;Cheng Lu;Nanping Hua;Yukou Du .Titanium dioxide nanoparticles co-doped with Fe~(3+) and Eu~(3+) ions for photocatalysis[J].Materials Letters,2002(4):794-801. |
| [4] | 梁金生,金宗哲,王静.稀土/纳米TiO2的表面电子结构[J].中国稀土学报,2002(01):74-76. |
| [5] | JIAN CHEN;DAVID F. OLLIS;WIM H. RULKENS .PHOTOCATALYZED OXIDATION OF ALCOHOLS AND ORGANOCHLORIDES IN THE PRESENCE OF NATIVE TiO2 AND METALLIZED TiO2 SUSPENSIONS. PART (II) PHOTOCATALYTIC MECHANISMS[J].Water research: A journal of the international water association,1999(3):669-676. |
| [6] | Ken-ichi Ishibashi;Akira Fujishima;Toshiya Watanabe;Kazuhito Hashimoto .Detection of active oxidative species in TiO_2 photocatalysis using the fluorescence technique[J].Electrochemistry communications,2000(3):207-210. |
| [7] | Bader H;Sturzenegger V;Hoigne J .Photometric method for the determination of low concentrations of hydrogen peroxide by the peroxidase catalyzed oxidation of N,N-diethyl-p-phenylenediamine (DPD)[J].Water Research,1988,22(09):1109-1115. |
| [8] | Allen W. Burton;Kenneth Ong;Thomas Rea .On the estimation of average crystallite size of zeolites from the Scherrer equation: A critical evaluation of its application to zeolites with one-dimensional pore systems[J].Microporous and Mesoporous Materials,2009(1/2):75-90. |
| [9] | 安筱莎,陈德俊,周志有,汪强,樊友军,孙世刚.稀土Eu掺杂PtRu/C催化剂及其对甲醇电氧化的性能[J].物理化学学报,2010(05):1207-1213. |
| [10] | 李金环,康万利,闫文华,郭伊荇,高洪峰,刘忠和.Eu3+掺杂TiO2纳米晶的制备及光催化降解部分水解聚丙烯酰胺[J].物理化学学报,2008(06):1030-1034. |
| [11] | BIAN Liang,SONG Mianxin,ZHOU Tianliang,ZHAO Xiaoyong,DAI Qingqing.Band gap calculation and photo catalytic activity of rare earths doped rutile TiO2[J].稀土学报（英文版）,2009(03):461-468. |
| [12] | 杨秋景,徐自力,谢超,薛宝永,杜尧国,张家骅.铕掺杂对纳米TiO2的光催化活性的影响[J].高等学校化学学报,2004(09):1711-1714. |
| [13] | Rengaraj S;Li XZ .Enhanced photocatalytic reduction reaction over Bi3+-TiO2 nanoparticles in presence of formic acid as a hole scavenger[J].Chemosphere: Environmental toxicology and risk assessment,2007(2):930-938. |
| [14] | 徐占霞,崔冠军,张敏,杨建军.新型CdS/TiO2纳米复合材料的制备及其可见光催化性能研究[J].影像科学与光化学,2008(06):489-498. |
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