文档介绍：摘要
摘 要
TiO2 由于受激发波长限制,对太阳能的利用只限于不到 5%的紫外光。因此如何提高 TiO2 催化剂的催化效率是目前光催化领域研究的重要课题。Ts/TiO2 复合材料,并通过微波等离子体掺杂技术实现复合材料的 N、C 掺杂,研究不同复合催化 Ts/TiO2 复合材料的构建主要集中在两个方面:一是控制二氧化钛形貌和粒径并避免团聚发生,二是利用复合材料提高提高电子转移速率,减少电子和空穴复合。通过 N、 C 掺杂改性提高二氧化钛的光响范围,提高电子跃迁几率。
本文通过微波等离子体增强化学气相沉积装置制备管径均匀的碳纳米管。以氧气为气源,通过低压射频等离子体对碳纳米管表面进行活性处理,而后放置于浓硫酸中酸化,使碳管表面羧基化。对酸化后的碳纳米管再次通过低压射频等离子体表面改性,增强碳管表面的亲水性能。
采用气相水解法,Ts/TiO2 复合材料。将酸化并等离子体亲水改性后的碳纳米管置于空气中充分吸收水分,而后放置于氮
气保护的 TiCl4 气氛中,实现 TiCl4 在碳纳米管表面的水解形成
CNTs/TiO2 复合材料。在通过不同温度焙烧得到不同晶型含量的二氧化钛复合样品。最后通过微波等离子体实现对复合样品的 C、N 掺
杂改性。通过 FT-IR、XRD、SEM、TEM、XPS、UV-Dis 等方法对样品进行了测试和表征。通过对***橙的光催化降解实验测试了复
合催化剂的光催化性能。经过光催化测试表明,复合催化剂的光催
化性能要远高于粉体 TiO2;同一温度焙烧的复合催化剂,掺杂后的复合样品光催化能力高于未掺杂复合样品,C 掺杂复合样品在可见光下的光催化性能要高于 N 掺杂的复合样品。
T/TiO2/导电胶复合电极,测试了复合样品的光电性能。通过光电化学 I-v Ts 的存在提高了 TiO2 光生光电
流,这与光催化效率测试结果相吻合。
Ts/TiO2 纳米复合;光催化;光电化学
I
Abstract
Due to its large band gap energy,TiO2 only can absorb UV light, which is less than 5% in solar spectrum. Therefore, the study on the TiO2 photocatalyst with visible light-responsive property is the most challenging subject in the field of photocatalysis. In this paper, CNTs/posites were generated. Our preliminary investigation also used dopping C, N to enhance the photocatalytic activity of TiO2 with plasma doping system. CNTs in posites were to improve the photocatalytic performance by enhancing the electron mobility. Through the N, C doping modification of titanium dioxide increase light ring scope, improving electronic transition probability.
Ts were prepared through the chemical vapor deposition method. Ts were treated with oxygen plasma and soaked in H2SO4 for acidification. After acidification Ts were treated with oxygen plasma again and exposed to air to absorb moisture. The Ts posites were essfully fabricated by TiCl4 hydrolyse on the surface Ts. The Ts posites were annealing with different temperature using the tube furnace, which was purged with Ar. Then, dopping C, N enhances the photocatalytic activity of TiO2 with microwave plasma dopin