Method for preparing high efficiency metallic, non-metallic ion co-doped nano-TiO2 visible-light responsive photocatalyst

高效率金属、非金属离子共掺杂纳米TiO<sub>2</sub>可见光催化剂的制备方法

Abstract

本发明公开了一种制备高效率金属、非金属离子共掺杂纳米TiO<sub>2</sub>可见光催化剂的方法,属于光催化技术范围。它以钛酸酯为前躯体,以金属盐、含非金属元素化合物为掺杂剂,采用溶胶-凝胶法制备具有双相掺杂、高效率可见光催化活性的纳米TiO<sub>2</sub>基光催化剂。该催化剂的可见光催化活性大幅度超过单掺非金属离子TiO<sub>2</sub>。本发明具有如下创新点:1.通过金属、非金属离子共掺杂,使TiO<sub>2</sub>基催化剂的导带能级下方和价带能级上方分别产生非连续定域态掺杂能级,从而增强了可见光吸收,导致该催化剂的可见光催化活性大幅度提高。2.由于掺杂能级的存在,抑制了光生载流子复合,提高了光生载流子参加光催化反应的几率,有效降解污染物分子。
The invention discloses a process for preparing a high efficiency nanometer Tio2 visible light catalyst codoped with metal and non metallic ion, belonging to the photocatalysis technology field. The invention adopts titanic acid ester as precursor, uses metal salt and non-metallic compound as dopant, in accordance with sol-gel method, prepares the nanometer TiO2-based photocatalyst with codoping, high efficiency and visible light catalytic activity, wherein the catalytic activity is greatly higher than that of single-doped TiO2-based catalyst. The invention is characterized by the following: 1. due to codoping of the metal and non metallic ion, discrete localized doping level is formed respectively on the lower part of the conduction band energy level and the upper part of the valence band energy level of the TiO2-based catalyst, thus increasing the absorption of visible light and greatly improving the catalytic activity; 2. the doping level can inhibit the recombination of photogenerated carrier, promote the probability of the photogenerated carrier entering into the photocatalytic reaction and efficiently degrade pollutant molecules.

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