采用溶胶-凝胶法制备纯的及掺杂不同量Ce的TiO2纳米粒子,利用UV-Vis漫反射光谱及XRD等对所制备样品进行表征和解释,以高压汞灯为光源,甲基橙水溶液的脱色为模型反应,研究了CeO2/TiO2的光催化降解反应活性.实验发现:掺杂Ce的TiO2纳米粒子反射光谱特性向可见光方向红移到了500 nm;掺杂Ce的TiO2纳米粒子比纯的TiO2纳米粒子对光的吸收率高、吸收能力强;掺杂的Ce4+仅有少量进入TiO2晶格中,而大部分的Ce4+没有进入TiO2晶格中,而是以小团簇的CeO2形态均匀地分散在TiO2纳米粒子中或者是覆盖在其表面上,说明掺杂Ce能提高TiO2光催化反应活性,且掺杂Ce量有最佳值.实验结果表明:在TiO2中掺杂Ce的摩尔百分含量为2%,甲基橙起始浓度为20 mg·L-1,CeO2/TiO2用量为0.400 g,双氧水用量为5.88 mmol·L-1,pH值为6.4时,光照8 h,甲基橙的脱色率可达96.8%.
参考文献
| [1] | 崔玉民,韩金霞.光催化降解水中有机污染物研究现状与展望[J].燃料化学学报,2004(01):123-128. |
| [2] | Wang C Y;Ronald P;Detlef W B et al.Quantum yield of formaldehyde formation in the presence of colloidal TiO2-based photocatalysts:effect of intermittent illumination,platinization,and deoxygenation[J].Journal of Physical Chemistry B,2004,108:14082. |
| [3] | GAO Yuan,YU Wei,Chen Baohua,Ma Yongxiang,LI Hulin.Photocatalytic performance of TiO2 immobilized on polystyrene (PS) thin film for mineralization of pollutants[J].稀有金属(英文版),2003(02):137-143. |
| [4] | Ozkan A;Ozkan M H;Gurkan R et al.Photocatalytic degradation of textile azo dye,sirius gelb Gcon TiO2 or Ag/TiO2 particles in the absence and presence of UV irradiation:the effects of some inorganic anions on the photocatalysis[J].Journal of Photochemistry and Photobiology A:Chemistry,2004,163(1-2):29. |
| [5] | 任成军,钟本和,周大利,刘恒,李大成,龚家竹.水热法制备高活性TiO2光催化剂的研究进展[J].稀有金属,2004(05):903-906. |
| [6] | 郭家秀,袁书华,龚茂初,沈美,钟俊波,陈耀强.CeO2-ZrO2-Y2O3对Pt-Rh型三效催化剂性能的影响[J].中国稀土学报,2006(02):174-178. |
| [7] | Wei Zhao;Wanhong Ma;Chuncheng Chen;Jincai Zhao;Zhigang Shuai .Efficient Degradation of Toxic Organic Pollutants with Ni_2O_3/TiO_(2-x)B_x under Visible Irradiation[J].Journal of the American Chemical Society,2004(15):4782-4783. |
| [8] | Bo S;Alexander V V;Panagiotis G S .Role of platinum deposited on TiO2 in phenol photocatalytic oxidation[J].Langmuir,2003,19:3151. |
| [9] | Selcuk H.;Zaltner W.;Sene JJ.;Bekbolet M.;Anderson MA. .Photocatalytic and photoelectrocatalytic performance of 1% Pt doped TiO2 for the detoxification of water[J].Journal of Applied Electrochemistry,2004(6):653-658. |
| [10] | Subramanian V.;Wolf EE.;Kamat PV. .Influence of metal/metal ion concentration on the photocatalytic activity of TiO2-Au composite nanoparticles[J].Langmuir: The ACS Journal of Surfaces and Colloids,2003(2):469-474. |
| [11] | XIE Yibing,YUAN Chunwei.Rare earth ion modified TiO2 sols for photocatalysis application under visible light excitation[J].稀有金属(英文版),2004(01):20-26. |
| [12] | 水淼,岳林海,徐铸德.稀土镧掺杂二氧化钛的光催化特性[J].物理化学学报,2000(05):459-463. |
| [13] | 张前程,张凤宝,张国亮,王祖鹓.超细Co/TiO2和Ce/TiO2的制备及光催化性能[J].精细化工,2003(04):227-229. |
| [14] | 潭小萍.光催化氧化法用于垃圾渗滤液深度处理主要影响因素的试验研究[J].环境科学动态,1999(01):28-30. |
| [15] | 施利毅;李春忠;房鼎业 等.二氧化钛超细粒子的制备及其光催化降解含酚溶液[J].华东理工大学学报(自然科学版),1998,24(03):292. |
| [16] | Amalric L;Guillard C;Pichat P .Use of catalase and superoxide dismutase to assess the roles of hydrogfen peroxide and superoxide in the TiO2 or ZnO photocatalytic destruction of 1,2-dimethoxybenzene in water[J].Research on Chemical Intermediates,1994,20:579. |
| [17] | Cornish B J P A;Lawton L A;Robertson P K J .Hydrogen peroxide enhanced photocatalytic oxidation of microcystin-LR using titanium dioxide[J].Applied Catalysis B:Environmental,2000,25:59. |
| [18] | Siffert B .Study on the interaction of titanium dioxide with cellulose fibers in an aqueous medium[J].Colloids and Surfaces,1991,53:79. |
| [19] | Wei T Y;Wan C C .Heterogeneous photocatalytic oxidation of phenol with titanium dioxide particles[J].Industrial and Engineering Chemistry,1991,30:1293. |
| [20] | Matthews R W .Photooxidation of organic impurities in water using thin films of titanium dioxide[J].Journal of Physical Chemistry,1987,91:3328. |
| [21] | Subramanian V;Wolf E E;Kamat P V .Catalysis with TiO2/Au nanocomposites.Effect of metal particle size on the fermi level equilibration[J].Journal of the American Chemical Society,2004,126:4943. |
| [22] | 崔玉民,朱亦仁.光催化氧化脱除硫化物[J].燃料化学学报,2000(05):468-472. |
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