| 李慧泉,李越湘,周新木,彭绍琴,吕功煊,李树本.La2O3掺杂TiO2光催化剂的制备和性能[J].分子催化,2004,(4):304-309 |
| La2O3掺杂TiO2光催化剂的制备和性能 |
| Preparation and Properties of La 2O3 doping TiO2 Photocatalyst |
| 修订日期：2003-12-15 |
| DOI： |
| 中文关键词: 光催化 二氧化钛 三氧化二镧 掺杂 甲基橙 |
| 英文关键词:Photocatalysis,Titanium dioxide,Lanthanum sesquioxide,Doping,Methyl orange |
| 基金项目:973项目(2003CB214503)和江西省自然科学基金资助项目(0220007). |
| 李慧泉 李越湘 周新木 彭绍琴 吕功煊 李树本 |
| [1]南昌大学化学系,江西南昌330047 [2]中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室,甘肃兰州730000 |
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| 中文摘要: |
| 采用溶胶-凝胶法制备了La2O3掺杂TiO2纳米光催化剂，并通过XRD、TEM、BET和XPS等手段进行了表征．掺入La2O3后，阻止了TiO2从锐钛矿晶型向金红石晶型的转变，使TiO2的粒径减小，比表面积增大．以甲基橙为光催化降解反应模型化合物，考察了光催化剂的活性．测定了甲基橙在纯TiO2和La2O3掺杂TiO2光催化剂上的吸附常数．考察了pH、H2O2对降解性能的影响．讨论了光催化活性与催化剂性质的关系． |
| 英文摘要: |
| La_2O_3-TiO_2 samples were prepared by sol-gel process and characterized by means of XRD, TEM, BET, and XPS. It has been shown that with the doping of La_2O_3 the particle diameter of La_2O_3-TiO_2 samples decreased, the specific surface area increased, and the crystal phase transformation of TiO_2 from anatase to rutile is prevented. Using the photocatalytic degradation of methyl orange as a model reaction, activity of prepared photocatalysts was investigated in TiO_2 and La_2O_3-TiO_2 nano-power suspension irradiated by high-pressure mercury lamp. As a result, the addition of La_2O_3 to TiO_2 notably enhanced its photocatalytic activity. The adsorption constants of methyl orange on the Lanthanum Oxide doped catalysts and the nonmodified TiO_2 catalyst were evaluated. The effects of H_2O_2 and pH of the methyl orange on the degradation ratio also were investigated. The optimum loading amount of La is 1% of Ti (molar ratio). Moreover, the relationship between photocatalytic activity and the properties of the samples has been discussed. |
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