采用溶胶-凝胶法制备 Ce 掺杂 TiO2(Ce-TiO2)纳米颗粒,借助 XRD、XPS、UV-Vis、DRS 等手段对催化剂的结构和理化性质进行分析表征,并以酸性红染料作为模型污染物,考察 Ce-TiO2在可见光作用下的催化活性。实验结果表明,在 CeO2和 TiO2界面形成了Ce-O-Ti键,从而抑制了催化剂的晶化和相转变过程,并在 TiO2的禁带中引入了 Ce4f 掺杂能级。Ce-TiO2在可见光区具有显著吸收,且光生载流子的复合受到有效抑制,因此,Ce 掺杂明显提高了TiO2降解污染物的效率。当 Ce 掺杂量为20%(摩尔分数),煅烧温度为400℃时,催化剂的活性达到最佳。
Ce-doped TiO2 nanoparticles were prepared by sol-gel method.The structure and physicochemical properties of the catalysts were investigated by means of XRD,FT-IR,XPS,UV-Vis DRS,etc.The photocat-alytic activities of Ce-doped TiO2 were evaluated by the degradation of acid red under visible light irradiation. The experiment results show that Ce-O-Ti bonds are formed on the interface of cerium oxide and TiO2 ,so that the crystallization and phase transition processes of the catalyst are impeded.Ce-TiO2 has a significant ab-sorption in the visible region and the recombination of the photo-generated electron and hole pairs was greatly inhibited.Hence,the visible-light-driven photocatalytic efficiency of Ce-TiO2 was significantly enhanced.The catalyst doped with 20% Ce presents the best activity when calcinated at 400 ℃.
参考文献
| [1] | Gr?tzel M .Photoelectrochemical cell[J].NATURE,2001,414:338-344. |
| [2] | 柳清菊,吴兴惠,刘强.热处理温度对TiO2薄膜光催化及亲水性的影响[J].功能材料,2003(02):189-191. |
| [3] | Jiefang Zhu;Zhigang Deng;Feng Chen;Jinlong Zhang;Haijun Chen .Hydrothermal doping method for preparation of Cr~(3+)-TiO_2 photocatalysts with concentration gradient distribution of Cr~(3+)[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2006(3/4):329-335. |
| [4] | 燕宁宁,张莹,龚昌杰,朱忠其,柳清菊.Ce-TiO2光催化剂的制备与性能研究[J].功能材料,2012(01):92-95. |
| [5] | Jakob M;Levanon H;Kamat P V .Charge distribution between UV-irradiated TiO2 and gold nanoparticles:de-termination of shift in the Fermi level[J].Nano Letters,2003,3:353-358. |
| [6] | Li XZ.;Li FB. .Study of Au/Au3+-TiO2 photocatalysts toward visible photooxidation for water and wastewater treatment[J].Environmental Science & Technology: ES&T,2001(11):2381-2387. |
| [7] | Bingham S;Daoud W A .Recent advances in making nano-sized TiO2 visible-light active through rare-earth metal doping[J].Journal of Materials Chemistry,2010,21:2041-2050. |
| [8] | N.R. Khalid;E. Ahmed;Zhanglian Hong;M. Ahmad.Synthesis and photocatalytic properties of visible light responsive La/TiO_2-graphene composites[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2012:254-259. |
| [9] | 张俊平,王艳,戚慧心.CeO2-TiO2复合催化剂的制备、表征和性能[J].北京师范大学学报(自然科学版),2001(05):667-670. |
| [10] | Xie, J.;Jiang, D.;Chen, M.;Li, D.;Zhu, J.;Lü, X.;Yan, C. .Preparation and characterization of monodisperse Ce-doped TiO_2 microspheres with visible light photocatalytic activity[J].Colloids and Surfaces, A. Physicochemical and Engineering Aspects,2010(1/3):107-114. |
| [11] | Weiliang Xue;Guowen Zhang;Xiongfa Xu .Preparation of titania nanotubes doped with cerium and their photocatalytic activity for glyphosate[J].Chemical engineering journal,2011(1):397-402. |
| [12] | Fang J;Bi XZ;Si DJ;Jiang ZQ;Huang WX .Spectroscopic studies of interfacial structures of CeO2-TiO2 mixed oxides[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2007(22):8952-8961. |
| [13] | Magdalena Palacio;Paula I. Villabrille;Gustavo P. Romanelli .Ecofriendly liquid phase oxidation with hydrogen peroxide of 2,6-dimethylphenol to 2,6-dimethyl-1,4-benzoquinone catalyzed by TiO2-CeO2 mixed xerogels[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2009(1/2):62-68. |
| [14] | Chen Q F;Jiang D;Shi W M et al.Visible-light-acti-vated Ce-Si co-doped TiO2 photocatalyst[J].Applied Surface Sinence,2009,255:7918-7924. |
| [15] | Bifen Gao;Tuti Mariana Lim;Dewi Puspitaningrum Subagio .Zr-doped TiO2 for enhanced photocatalytic degradation of bisphenol A[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2010(1):107-115. |
| [16] | Tianzhong Tong;Jinlong Zhang;Baozhu Tian .Preparation of Ce-TiO2 catalysts by controlled hydrolysis of titanium alkoxide based on esterification reaction and study on its photocatalytic activity[J].Journal of Colloid and Interface Science,2007(1):382-388. |
| [17] | Choudhury, B.;Borah, B.;Choudhury, A. .Extending photocatalytic activity of TiO _2 nanoparticles to visible region of illumination by doping of cerium[J].Photochemistry and Photobiology: An International Journal,2012(2):257-264. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%