Montmorillonite helps BiOCl photodegradation of antibiotics
ENVIRONMENTAL SCIENCE-NANO(2023)
摘要
Constructing efficient photocatalysts for the degradation of antibiotics was highly challenging. The support carrier played an active role in the reactivity, adsorption and lifetime of the catalyst. Herein, BiOCl/Mt photocatalysts were successfully prepared on a large scale by mixing natural iron-rich montmorillonite (Mt), bismuth nitrate, ethylene glycol (EG) and deionized water at room temperature. The optimal mass ratio of BiOCl/Mt was 1 : 1, and it could degrade 95.9% tetracycline hydrochloride (TCH) within 60 minutes. Compared with that of pure BiOCl, the degradation rate and kinetic constant were increased by 39% and 3.4 times, respectively. This was due to the fact that BiOCl/Mt has a smaller band gap and more positive valence potential than pure BiOCl, indicating a higher utilization efficiency of light and a stronger oxidation capability of holes (h+). The leading role of holes in TCH degradation was confirmed by free radical trapping experiments. In addition, the potential intermediates were identified by liquid chromatography-mass spectrometry, and ECOSAR software predicted that more than half of the products were less toxic than TCH molecules. This study demonstrated that iron-rich Mt not only was a carrier but also participated in the photocatalytic reaction as a p-type semiconductor and formed a p-n heterojunction with n-type semiconductor BiOCl, which significantly improved the photocatalytic ability of BiOCl/Mt. Construction of p-n junction BiOCl/montmorillonite photocatalysts with enhanced carrier separation efficiency for degradation of antibiotics.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要