以钛酸四丁酯（TBT）为原料，采用溶胶-凝胶法制备了纯TiO2和La^3＋-Pr^3＋共掺杂复合粉体（La^3＋-Pr^3＋／TiO2），采用XRD、UV—Vis和TEM等测试手段分析了在紫外光照射下，以降解甲基橙为探针反应研究其可见光催化性能。结果显示：所有样品均为锐钛矿相纳米TiO2，稀土元素镧和镨掺杂后TiO2特征衍射峰宽化，强度降低；与纯TiO2、镧掺杂TiO2与镨掺杂TiO2相比，光催化剂La^3＋-Pr^3＋共掺杂TiO2颗粒的粒径更小，比表面积更大，光吸收边红移程度更显著；与未掺杂和单一掺杂的TiO2相比较，共掺杂的TiO2具有更高的可见光催化性能。当La^3＋与TiO2和Pr^3＋与TiO2的摩尔比分别为1．0％和0．2％时，可见光催化性能最好。可见光催化性能的提高归因于镧和镨的协同作用。
Abstract: Pure nano TiO2 and La^3+- Pr^3+ co-doped nano-TiO2 (La^3+- Pr^3+/TiO2) catalyst were prepared by a sol-gel method with TBT and distilled water as forerunner body, ethanol as solvent and glacial acetic acid as inhibitor. The prepared samples were characterized by XRD, TEM and UV - Vis. The UV- light photocatalytic performance of the obtained materials was evaluated by methylene orange decomposition. The results show that the prepared samples are all pure anatase phase nano-TiO2 and their diffraction peak broadens obviously after La^3+ - Pr^3+ co-doped. Compared with pure TiO2, the particle sizes of La^3+- Pr^3+ co-doped TiO2 are smaller, its specific surface area is larger, and its absorption edge shifts more remarkably towards longer wavelength. The photocatalytic activity of La^3+- Pr^3+ co-doped TiO2 is higher than that of TiO2 or La^3+ (Pr^3+) -doped TiO2, which is enhanced with the La^3+ and Pr^3+ contents, reaching the maximum at the La^3+/TiOz and Pr^3+/TiO2 molar ratios of 1.0% and 0.2%, respectively. The enhanced visible photocatalytic performance is attributed to the synergetic effect of La^3+ and Pr^3+ co-doped.
参考文献
| [1] | Stromberg J R, Wnuk J D,Meyer G J, et al. Multielectrontransfer at heme - functionalized nanocrystalline T1O2 :Reductive dechlorination of DDT and CCI4 forms stable carbenecompounds [J]. Nano Lett, 2006,6(6) : 1284-1286. |
| [2] | 付乌有,杨海滨,刘冰冰,等.锐钛矿型Ti02/MnFe204核壳结构复合纳米颗粒的制备及其光催化特性[J].复合材料学报,2007, 24(3): 136-140. |
| [3] | Catanzaro I,Avellone G, Marc G,et al. Palmisano,Biological effects and photodegradation by TiC>2 of terpenespresent in industrial wastewater [J]. J Hazard Mater, 2011,185: 591-597. |
| [4] | Wu Y M,Xing M Y, Zhang J L. Gel - hydrothermal synthesisof carbon and boron co - doped T1O2 and evaluating itsphotocatalytic activity [J]. J Hazard Mater,2011, 192(1):368-373. |
| [5] | Cruz D de la, Arevalo J C,Torres G, et al. T1O2 doped withSm3+ by sol-gel: Synthesis, characterization andphotocatalytic activity of diuron under solar light [ J ].Catalysis Today, 2011,166(1) : 152-158. |
| [6] | Mahmoud S S. Electroless deposition of nickel and copper ontitanium substrates: characterization and application [J]. JAlloys Compd, 2009,472(1/2) : 595-601. |
| [7] | Paola A, Marie G, Palmisano, et al. Preparation ofpolycrystalline photocatalysts impregnated with varioustransition metal ions: Characterization and photocatalyticactivity for the degradation of 4 - nitrophenol [J]. J PhysChem B, 2002, 106(3): 637-645. |
| [8] | 徐松梅,髙朋召,石宗利.双元素掺杂改性二氧化钛的研究进展[J].硅酸盐通报,2008,27(4): 777-781. |
| [9] | 崔玉民,范少华,苏凌浩.功能材料二氧化钛光催化降解酸性黑染料[J].北京科技大学学报,2006,28(7): 625-629. |
| [10] | Ding Z,Zhu H Y, Greenfiele P F, et al. Characterization ofpore structure and coordination of titanium in TiO2 and Si02-pillared clays [J]. Journal of Colloid and Interface Science,2001,238: 267-272. |
| [11] | Hua Z L,Shi J L,Zhang W H, et al. Direct synthesis andcharacterization of Ti - containing mesoporous silica thin films[J]. Mater Lett, 2002, 53(4/5): 299-304. |
| [12] | Jing H, Guo Z Y, Ma H,et al. Enhancing the selectivity ofbenzene hydroxylation by tailoring the chemical affinity of theMCM- 41 catalyst surface for the reactive molecules [J].Journal of Catalysis, 2002,212 : 22-32. |
| [13] | Xu A W,Gao Y,Liu H Q. The preparation, characterizationand their photo - catalytic activities of rare - earth - doped T1O2nanoparticles [J], J Catal, 2002, 207(2) : 151-157. |
| [14] | 赵斯琴,郭敏,张梅,等.Eu3+离子掺杂纳米Ti02的制备及其光催化降解甲基兰溶液的研究[J].中国稀土学报,2010, 28(3): 297-301. |
| [15] | 陈俊涛,李新军,杨莹,等.Stn掺杂对Ti02薄膜光催化性能的影响[J].催化学报,2004,25(5): 397-401. |
| [16] | 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,2000,16(5): 459-463. |
| [17] | 高远,徐安武,祝静艳,等.RE/Ti02用于N02光催化氧化的研究[J].催化学报,2001,22(1): 53-56. |
| [18] | RanjiteKT,Willner I, Bossmann S H, et al. Lanthanideoxide doped titanium dioxide photicatalysts : Effectivephotocatalysts for the enhanced degradation of salicylic acidand tcinnamic acid [J]. J Catal, 2001,2004: 305-313. |
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