以尿素为氮源，采用简单的酸催化溶胶-凝胶法制备了氮掺杂TiO2纳米光催化剂，以甲基橙在可见光照射下的光催化降解为探针反应，评价了其光催化活性。运用XRD、XPS和UV—visDRS光谱表征技术考察了氮掺杂TiO2样品的微晶尺寸、晶相结构、表面组成及其吸光特性。结果表明氮掺杂减小了TiO2的带能隙，氮掺杂TiO2纳米微晶对400～530nm的可见光有较强的吸收，在降解甲基橙的实验中表现出良好的可见光催化活性。其中，400℃焙烧制得的具有单一锐钛矿相型，晶粒尺寸为14．94nm的TiO1.9904 N0.0096样品的可见光催化活性最佳。
Nitrogen-doped TiO2 nano-sized photocatalysts were prepared by a simple acid-catalyzed sol-gel method using urea as nitrogen raw material. The photocatalytic decomposition of methyl orange in aqueous solution was used as a probe reaction to evaluate their photocatalytic activities under visible light irradiation. The prepared ni- trogen-doped TiO2 samples on the crystallite sizes, cystal pattern, suface composition and optical absorption property were characterized by means of the techniques such as XRD,XPS and UV-Vis DRS spectra. The re- sults showed that doping nitrogen in TiO2 reduces its band gap energy,which makes nitrogen-doped TiO2 nano- crystallites have a stronger visible light absorption from 400 to 530nm. Also they have high visible light photo- catalytic activities in the degradation of methyl orange. The crystallite size of single anatase TiO1.9904 N0.0096 calcined at 400℃ was 14.94nm and exhibited the highest visible light photocatalytic activity.
参考文献
| [1] | CAI Heshan,LIU Guoguang,Lü Wenying,LI Xiaoxia,YU Lin,LI Daguang.Effect of Ho-doping on photocatalytic activity of nanosized TiO2 catalyst[J].稀土学报（英文版）,2008(01):71-75. |
| [2] | C.A. Castro-Lopez;A. Centeno;S.A. Giraldo .Fe-modified TiO2 photocatalysts for the oxidative degradation of recalcitrant water contaminants[J].Catalysis Today,2010(1/4):119-124. |
| [3] | M. Hussain;R. Ceccarelli;D.L. Marchisio .Synthesis, characterization, and photocatalytic application of novel TiO2 nanoparticles[J].Chemical engineering journal,2010(1):45-51. |
| [4] | 蔡河山,黎晓霞,刘国光,吕文英,余林,黄伟涛,吴义华.Gd掺杂TiO2纳米晶的酸催化Sol-gel法制备与表征[J].材料工程,2009(03):32-36. |
| [5] | Ma Y F;Zhang J L;Tian B Z et al.Synthesis and characterization of thermally stable Sin,N co-doped TiO2 with highly visible light activity[J].Journal of Hazardous Materials,2010,182(1-3):386-393. |
| [6] | 蔡河山,刘国光,黎晓霞.模拟太阳光下Ho掺杂TiO2纳米晶的光催化性能[J].硅酸盐学报,2008(05):700-703. |
| [7] | S. Bangkedphol;H.E. Keenan;C.M.Davidson;A.Sakultantimetha;W. Sirisaksoontorn;A. Songsasen .Enhancement of tributyltin degradation under natural light by N-doped TiO_2 photocatalyst[J].Journal of hazardous materials,2010(1/3):533-537. |
| [8] | Asahi R;Morikawa T;Ohwaki T et al.Visible-light photocatalysis in nitrogen-doped titanium oxides[J].Science,2001,293:269-271. |
| [9] | Mozia S;Tomaszewska M;Kosowska B et al.Decompositon of nonionic surfacant on a nitrigen-doped photocatalyst under visible-light irradiation[J].Applied Catalysis B:Environmental,2004,56:285-290. |
| [10] | Shu Yin;Qiwu Zhang;Fumio Saito;Tsugio Sato .Preparation of visible light-activated titania photocatalyst by mechanochemical method[J].Chemistry Letters,2003(4):358-359. |
| [11] | Shu Y;Yamaki H;Zhang QW;Komatsu M;Wang JS;Qing T;Saito F;Sato T .Mechanochemical synthesis of nitrogen-doped titania and its visible light induced NOx destruction ability[J].Solid state ionics,2004(1/4):205-209. |
| [12] | Morikawa T;Asahi R;Ohwaki T et al.Bandgap narrowing of titanium dioxide by nitrogen doping[J].Journal of Applied Physics,2001,40(6A):561-563. |
| [13] | Mitsuhashi T;Kepplar O J .Trans-formation enthalpies for TiO2 polymorphs[J].Journal of the American Ceramic Society,1979,62:356-362. |
| [14] | Ihara T;Miyoshi M;Iriyama Y et al.Visible-light-active titanium oxide photo-catalyst realized by an oxygen-deft-cient structure and by nitrogen doping[J].Applied Catalysis,2003,42(04):403-409. |
| [15] | Saha N C;Tompkins H G .Titanium nitride oxidation chemistry:an X-ray photoelectron spectroscopy study[J].Journal of Applied Physics,1992,72:3072-3079. |
| [16] | Irie H;Watanabe Y;Hashimoto K .Nitrogen-concentra-tion dependence on photo-catalytic activity of TiO2-x Nx powders[J].Journal of Physical Chemistry B,2003,107(23):5483-5486. |
| [17] | Yin S;Aita Y;Komatsu M;Wang JS;Tang Q;Sato T .Synthesis of excellent visible-light responsive TiO2-xNy photocatalyst by a homogeneous precipitation-solvothermal process[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,2005(6):674-682. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%