Ma Siyu, Qin Yiying, Sun Kongyuan, Ahmed Jahangeer, Tian Wei, Ma Zhaoxia
College of Chemistry & Environment, Southwest Minzu University, Chengdu 610225, China.
Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
Materials (Basel). 2024 Jun 14;17(12):2930. doi: 10.3390/ma17122930.
The synergy of adsorption and photocatalysis is a good method to remove organic pollutants in wastewater. In recent decades, persistent photocatalysis has gained considerable interest for its ability to sustain the catalytic degradation of organic pollutants in the dark. Herein, we report three different TiO nanomaterials to remove tetracycline hydrochloride (TCH) in solution. We found that the removal ability of TiO, Ni-TiO, and Ag/Ni-TiO is 8.8 mg/g, 13.9 mg/g and 23.4 mg/g, respectively, when the initial concentration of TCH is 50 mg/L. Chemical adsorption could be the rate-determining step in the TCH adsorption process. Moreover, Ag nanoparticles dispersed on Ni doped TiO surface act as traps to capture photo-generated electrons upon illumination with indoor light. The holes in Ag/Ni-TiO serve as critical oxidative species in TCH degradation under dark conditions. This work provides new insights into the design of persistent photocatalysts that can be activated by weak illumination and degrade organic pollutants in wastewater after sunset.
吸附与光催化的协同作用是去除废水中有机污染物的一种有效方法。近几十年来，持久光催化因其能够在黑暗中持续催化降解有机污染物而备受关注。在此，我们报道了三种不同的TiO纳米材料用于去除溶液中的盐酸四环素（TCH）。我们发现，当TCH的初始浓度为50mg/L时，TiO、Ni-TiO和Ag/Ni-TiO的去除能力分别为8.8mg/g、13.9mg/g和23.4mg/g。化学吸附可能是TCH吸附过程中的速率决定步骤。此外，分散在Ni掺杂TiO表面的Ag纳米颗粒在室内光照下作为捕获光生电子的陷阱。在黑暗条件下，Ag/Ni-TiO中的空穴是TCH降解的关键氧化物种。这项工作为持久光催化剂的设计提供了新的见解，这种光催化剂可以被弱光照激活，并在日落后降解废水中的有机污染物。
