Nano-TiO2 -P25-SO3 H as our previous report has successfully been utilized to synthesize azobenzene through the selective conversion of aniline under visible light irradiation. According to PL emission spectra, the immobilizing a solid Brønsted acid of -SO3 H groups on the pure-TiO2 -P25 surface with a close interface is an approach to amplify the nano-TiO2 -P25 response to visible light, which can productively hinder the recombination rate of photo-generated electrons and holes as carriers. Therefore, the photocatalytic activity of the semiconductor is highly likely to increase. Photooxidation of aniline to azobenzene was achieved by applying nano-TiO2 -P25-SO3 H (Eg = 2.6 eV) that activated by blue photons (λmax = 460 nm), green photons (λmax = 510 nm) and red photons (λmax = 630 nm) which is introducing as a sustainable procedure. Central composite design (CCD) was employed for evaluating the effects of photocatalyst amount, oxidant concentration and irradiation time on the synthesis of azobenzene by this approach. Easily synthesizing, recyclability of the photocatalyst, mild reaction condition and short reaction time could be considered as plus points of this process.

中文翻译：

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在可见光照射下，使用纳米 TiO 2 -P25-SO 3 H 将苯胺选择性转化为偶氮苯的有效且稳健的方法

Nano-TiO2 -P25-SO3 H 作为我们之前的报告已成功用于通过苯胺在可见光照射下的选择性转化来合成偶氮苯。根据PL发射光谱，将-SO3 H基团的固体布朗斯台德酸固定在具有紧密界面的纯TiO2-P25表面上是一种放大纳米TiO2-P25对可见光响应的方法，这可以有效地阻碍光生电子和空穴作为载流子的复合率。因此，半导体的光催化活性极有可能增加。通过应用由蓝色光子 (λmax = 460 nm)、绿色光子 (λmax = 510 nm) 和红色光子 (λmax = 630 nm），这是作为可持续程序引入的。采用中心复合设计（CCD）来评估光催化剂用量、氧化剂浓度和照射时间对这种方法合成偶氮苯的影响。容易合成、光催化剂的可回收性、温和的反应条件和较短的反应时间可以被认为是该工艺的优点。