Preparation and application of a porous titanium-based titania nanotube lead dioxide electrode

Abstract

The invention discloses the preparation and application of a porous titanium-based titania nanotube lead dioxide electrode. It belongs to the field of material preparation. The electrode uses porous titanium as the substrate, and the surface of the substrate and the surface of the hole wall have titanium oxide nanotubes as the intermediate layer of the electrode, and the lumen and surface of the titanium oxide nanotubes are coated with PbO 2 At the same time, the preparation method of the electrode is simple, with the porous titanium plate as the substrate, the method of anodic oxidation-annealing-high temperature gas phase reduction is used to form titanium oxide nanotubes on the surface of the substrate and the surface of the hole wall as the intermediate layer of the electrode, and then, through The corresponding electrode is prepared by loading the lead dioxide layer in the way of suction filtration and penetrating electrodeposition; the prepared electrode can be applied to the degradation of pollutants in the water body.

Description

technical field [0001] 本发明属于无机纳米材料合成领域,更具体地说,涉及一种多孔钛基亚氧化钛纳米管二氧化铅电极的制备与应用。 Background technique [0002] 电化学氧化技术作为高级氧化技术的一种,因其环境友好、反应迅速、设备简单、无需添加额外试剂以及易于自动化等优点备受广大学者青睐。 [0003] 电化学氧化法依靠反应生成的羟基自由基(·OH)实现有机污染物的降解及矿化,·OH的标准电位极高(E 0 =2.80V),能氧化绝大部分的有机物。二氧化铅电极,尤其是β-PbO 2 电极,制备成本低,导电性良好,此外二氧化铅电极析氧电位较高(1.8~2.0eV),故受到国内外学者的广泛关注。但在钛基体上制备二氧化铅电极还存在着一些问题,如PbO 2 层比较脆弱,容易发生龟裂并导致电极内电阻的提升,从而不利于电子的传输;另外,PbO 2 和钛基体的热膨胀系数差别较大,在发生电化学氧化反应时易造成PbO 2 层的脱落,从而导致电极失活。 [0004] 因此,申请公布号CN102173449A,申请公布日2011.09.07的中国发明专利申请文件中公开了一种纳米二氧化铅电,利用二氧化钛纳米管阵列作为多孔钛基二氧化铅电极的中间层,制得的多孔钛基二氧化铅电极稳定性好,使用寿命长,对有机污染物具有很好的降解效果。但二氧化钛导电性差,导致电极电阻大大增加。 [0005] 基于此,申请公布号CN105110425A,申请公布日2015.12.02的中国发明专利申请文件中公开了一种钛纳米管改性的三维多孔钛基体二氧化铅电极,该电极包括一个钛网基体,在基体上热沉积一个中间层,中间层由碳纳米管和锡锑氧化物组成,在中间层上电沉积二氧化铅表面活性层,该电极,同时利用碳纳米管表面强憎水性、独特的电催化性能、巨大的比表面积等优点,通过掺杂可以提高所制备电极的活性点数量,以及增强活性层与基体之间的结合力,防止脱落,延长了使用寿命。但该类电极中引入了Sn、Sb离子,长时间使用可能会导致离子析出,对水质造成二次污染且SnO 2 -Sb层的加入增加了电极制备的成本。且该电极制备基体为钛网,相较于多孔钛基体,电化学活性位点大大降低。 [0006] 为此,制备出电催化活性高、活性位点多、使用寿命长的高性能二氧化铅电...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of poor conductivity, poor stability, low service life and easy falling off of the catalytic layer of traditional lead dioxide electrodes, the present invention provides a porous titanium-based titania nanotube lead dioxide electrode with high conductivity (1000S / cm) Titanium oxide (Ti 4 o 7 ) nanotubes as the intermediate layer, with Ti 4 o 7 Lead dioxide with a similar crystal structure is used as the outer coating layer, and an electrode with excellent conductivity, catalytic performance and stability is prepared;

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