光催化
可见光谱
降级(电信)
辐照
光降解
材料科学
光化学
分解
化学
化学工程
催化作用
有机化学
光电子学
物理
计算机科学
工程类
电信
核物理学
作者
Xinling Wang,Zehao Li,Yu Zhang,Qiulei Li,Huan Du,Fang Liu,Xiaoli Zhang,Haibo Mu,Jinyou Duan
标识
DOI:10.1016/j.cej.2021.132270
摘要
Although advanced photocatalysts have been developed for water disinfection, photocatalytic activity is still limited owing to the difficulty of recycling nanoparticles and the high recombination rate of photogenerated electron-hole pairs. In this paper, efficient and recyclable CoFe2O4/CoFe2S4/MgBi2O6 (CFO/CFS/MBO) magnetic fibers (MNFs) photocatalyst with p-n-p type heterojunction are obtained by a simple hydrothermal method. As expected, when the optimal concentration of CFO/CFS/MBO was 0.5 mg/mL, the antibacterial rate reached 99.8% toward Methicillin-resistant Staphylococcus aureus (MRSA) after 60 min visible light irradiation. The optimal sample 30% CFO/CFS/MBO composite can degrade 82.7% Cefotaxime sodium (CTX) in 60 min. The mechanism was shown to be the severe damage of bacterial cell membranes and decomposition of antibiotic molecules caused by ROS generated by CFO/CFS/MBO photocatalyst under visible light irradiation. Due to the p-n-p heterojunction structural characteristics and abundant oxygen vacancies, CFO/CFS/MBO possessed a stronger absorption capacity of visible light and enhanced photo-generated carrier separation efficiency, which has a remarkably positive impact on the ability of photo-generated ROS. PL and EIS revealed the improvement of the separation efficiency of photogenerated carriers. LC-MS analysis, EPR and scavenger experiments verified the intermediate product, active species and photodegradation pathway in the photocatalytic process. Such recyclable and highly efficient CFO/CFS/MBO MNFs photocatalysts have promising applications in wastewater treatment.
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