Mechanism of Ultraviolet Aging Effect on the Adsorption of Ciprofloxacin by Nano-biochar

被引：0
|
作者：
Ma F.-F. [1 ]
Xue Z.-Y. [1 ]
Zhao B.-W. [1 ]
机构：
[1] School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou
来源：
Huanjing Kexue/Environmental Science | 2024年 / 45卷 / 04期
关键词：
adsorption mechanism; aging effect; ciprofloxacin; environmental behavior; nano-biochar;
D O I：
10.13227/j.hjkx.202305236
中图分类号：
学科分类号：
摘要：
The aging behavior of nano-biochar is inevitable in the natural environment；however，the mechanism of aging effects on the adsorption of pollutants by nano-biochar is not clear. The changes in composition and structural properties of nano-biochar before and after aging were analyzed using elemental analysis，scanning electron microscopy，transmission electron microscopy，and infrared spectroscopy. In this study，the adsorption mechanism of aged nano-biochar on ciprofloxacin（CIP）and the effect of solution pH and nano-biochar concentration gradient on adsorption were investigated. The results showed that the aging effect reduced the content of the C element，increased the content of the O element，enhanced the polarity，and decreased the aromatics and particle size of the nano-biochar. The adsorption of CIP on the nano-biochar before and after aging was largely dependent on the solution pH，and the increase in the solution pH under acidic conditions was more favorable to the adsorption of CIP. The study on the effect of the concentration gradient of nanobiochar showed that nano-biochar was more favorable for CIP adsorption under low-concentration conditions. The adsorption of CIP on nano-biochar before and after aging was more consistent with the pseudo-second order kinetic model，and the Langmuir model could better describe the adsorption behavior of CIP on nano-biochar before and after aging；the maximum adsorption amounts were 607. 69 mg·g-1 and 920. 73 mg·g-1，respectively. The adsorption performance of aging nano-biochar on CIP was better than that of nano-biochar，and the main adsorption mechanisms were pore filling，electrostatic interaction，and hydrogen bonding. Ultraviolet aging enhanced the adsorption performance of nano-biochar on CIP. © 2024 Science Press. All rights reserved.
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页码：2203 / 2210
页数：7
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