Ultrathin CuZnCr-LDH nanosheets for photo-Fenton synergistic degradation of ciprofloxacin and methylene blue

被引:1
|
作者
He, Zetian [1 ]
Shi, Tie [1 ]
Chen, Daimei [1 ]
Wang, Yuxin [1 ]
Feng, Yanmei [1 ]
Zhou, Fengshan [1 ]
Li, Yilei [2 ]
机构
[1] China Univ Geosci, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Beijing Key Lab Mat Utilizat Nonmet Minerals & Sol, Xueyuan Rd, Beijing 100083, Peoples R China
[2] Hebei Univ Sci & Technol, Hebei Key Lab Photoelect Control Surface & Interfa, Yuxiang St, Yuhua Dist 050018, Hebei, Peoples R China
基金
中国国家自然科学基金;
关键词
Ultrathin; Layered double hydroxide; Photo-Fenton; Degradation; LAYERED DOUBLE HYDROXIDES; CATALYSTS; HYBRID; WATER; OXIDE; ZN; CO;
D O I
10.1016/j.jallcom.2024.177302
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The extensive use and improper disposal of antibiotics and organic dyes have resulted in their substantial release into the natural environment, posing a grave threat to both the ecological system and human health. This study successfully synthesised an ultra-thin CuZnCr layered ternary hydrotalcite (CuZnCr-LDH) nanosheet, exhibiting remarkable photo-Fenton properties, through a streamlined one-step coprecipitation method. When the ratio of Cu+ to Zn2+ is 2:1, methylene blue (MB) degradation efficiency reaches 96.5 % after 70 min, and that of CIP attains 75 % after 3 h, and the mineralization rate can be as high as 81.3 % and 64.7 %. The key to enhancing its performance is that the ultrathin structure is conducive to carrier migration, a large number of photogenerated electrons are conducive to the recovery of valence states of Cu and Cr ions to promote Fenton reaction cycle, and the rich active species actively participate in the reaction. Furthermore, electron paramagnetic resonance (EPR) signaling and active material capture experiments have shown that photogenerated superoxide radicals (center dot O2- ), hydroxyl radicals (center dot OH) and holes (h+) as active species play a crucial role in the degradation process. And the cyclic pattern of the high-priced metal was verified by X-ray photoelectron spectroscopy (XPS) testing, which is a key factor in the photo-Fenton synergy. Based on the experimental results, the photo-Fenton degradation mechanism is proposed. This study holds important promise in addressing the pressing problem of water pollution caused by antibiotics and organic pollutants.
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页数:10
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