A novel efficient catalyst called Ag/N-doped TiO₂/CNTs was fabricated using a two-step method involving treatment with ammonia plasma followed by a process of hydrogen plasma reduction at a low temperature. The photocatalyst, which was composed of silver nanoparticles (AgNPs), titanium dioxide (TiO₂) and 5% amount of carbon nanotubes (CNTs), achieved an adequate formaldehyde elimination rate of 95% under visible-light irradiation. A series of analytical methods was employed to investigate the advantages of the novel fabrication method. The results showed that the first step, which is the N doping of TiO₂ could be particularly important for improving the photocatalytic performance because of the reduced band gap and newly formed Ti³⁺. Furthermore, it could assist in the anchor of AgNPs during the second step of fabrication. During the second step of hydrogen reduction process, AgNPs of smaller sizes were more homogeneously anchored on the surface of N-doped TiO₂/CNTs than that of the catalysts without ammonia plasma treatment. The resulting higher level of AgNPs could aid in efficient electron transfer and significantly improve the response to visible light, considering the surface plasmon resonance effect. CNTs and AgNPs played significant roles as electron acceptors in reducing the recombination rate of photogenerated hole pairs, and moreover, this two-step plasma process could be beneficial for achieving surface and interface properties suitable for formaldehyde photodegradation. This novel approach for fabricating an efficient Ag/N-doped TiO₂/CNTs has potential for application in environmental purification systems.

一种称为Ag/N 掺杂的TiO ₂ /CNTs 的新型高效催化剂是使用两步法制造的，该方法包括用氨等离子体处理，然后在低温下进行氢等离子体还原过程。该光催化剂由银纳米粒子（AgNPs）、二氧化钛（TiO ₂ ）和5%的碳纳米管（CNTs）组成，在可见光照射下甲醛去除率达到95%。采用一系列分析方法来研究这种新型制造方法的优点。结果表明，第一步，即TiO _2的N掺杂^{由于带隙减小和新形成的Ti 3+}，对于提高光催化性能可能特别重要。此外，它可以在第二步制造过程中帮助固定 AgNPs。在氢还原过程的第二步中，与未经氨等离子体处理的催化剂相比，_{较小尺寸的 AgNPs 更均匀地锚定在 N 掺杂的 TiO 2 /CNT 表面上}。考虑到表面等离子共振效应，由此产生的更高水平的 AgNP 有助于有效的电子转移并显着改善对可见光的响应。碳纳米管AgNPs 作为电子受体在降低光生空穴对的复合率方面发挥了重要作用，此外，这种两步等离子体工艺可能有利于实现适合甲醛光降解的表面和界面特性。这种制造高效Ag/N掺杂TiO ₂/CNT的新方法具有在环境净化系统中的应用潜力。