Niu Pingping, Wu Guanghui, Chen Pinghua, Zheng Huitao, Cao Qun, Jiang Hualin
Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang, China.
College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang, China.
Front Chem. 2020 Mar 13;8:172. doi: 10.3389/fchem.2020.00172. eCollection 2020.
No visible light activity is the bottle neck for wide application of TiO, and Boron doping is one of the effective way to broaden the adsorption edge of TiO. In this study, several Boron doped TiO materials were prepared via a facile co-precipitation and calcination process. The B doping amounts were optimized by the degradation of rhodamine B (Rh B) under visible light irradiation, which indicated that when the mass fraction of boron is 6% (denoted as 6B-TiO), the boron doped TiO materials exhibited the highest activity. In order to investigate the enhanced mechanism, the difference between B-doped TiO and bare TiO including visible light harvesting abilities, separation efficiencies of photo-generated electron-hole pairs, photo-induced electrons generation abilities, photo-induced charges transferring speed were studied and compared in details. h and were determined to be the two main responsible active species in the photocatalytic oxidation process. Besides the high degradation efficiency, 6B-TiO also exhibited high reusability in the photocatalysis, which could be reused at least 5 cycles with almost no active reduction. The results indicate that 6B-TiO has high photocatalytic degradation ability toward organic dye of rhodamine B under visible light irradiation, which is a highly potential photocatalyst to cope with organic pollution.
无光催化活性是限制TiO₂广泛应用的瓶颈，而硼掺杂是拓宽TiO₂吸附边的有效方法之一。本研究通过简便的共沉淀和煅烧过程制备了几种硼掺杂的TiO₂材料。通过在可见光照射下罗丹明B（Rh B）的降解来优化硼掺杂量，结果表明当硼的质量分数为6%时（记为6B-TiO₂），硼掺杂的TiO₂材料表现出最高的活性。为了探究其增强机理，详细研究并比较了硼掺杂TiO₂与纯TiO₂在可见光捕获能力、光生电子-空穴对的分离效率、光生电子产生能力、光生电荷转移速度等方面的差异。确定·OH和·O₂⁻为光催化氧化过程中两个主要的活性物种。除了具有高降解效率外，6B-TiO₂在光催化中还表现出高可重复使用性，可重复使用至少5个循环且活性几乎没有降低。结果表明，6B-TiO₂在可见光照射下对罗丹明B有机染料具有高光催化降解能力，是一种极具潜力的应对有机污染的光催化剂。
