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| Effects of kinetics and pH on adsorption of levofloxacin on iron oxide surfaces |
| Received:July 07, 2022 |
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| KeyWord:antibiotics;iron oxide;adsorption;kinetics;pH;levofloxacin |
| Author Name | Affiliation | E-mail | | LIU Zichao | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450000, China | | | REN Yanan | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450000, China | | | ZHOU Wenjing | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450000, China | | | LIU Chunhui | College of Horticulture, Henan Agricultural University, Zhengzhou 450002, China | | | LI Zixian | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450000, China | | | YANG Jinkang | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450000, China | | | SUN Qizhuang | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450000, China | | | WANG Long | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450000, China | hnndwanglong@163.com | | ZHAO Peng | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450000, China | zhpddy@163.com |
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| Abstract: |
| Batch adsorption kinetics, adsorption isotherm experiments, X-ray photoelectron spectroscopy(XPS) technology, and attenuated total reflection-fourier transform infrared spectroscopy(ATR-FTIR) were used in this investigation to gain insights into the levofloxacin (LEV) adsorption process on the surface of iron oxides at various pH values. Solution pH had a significant impact on LEV adsorption, and adsorption kinetics at different pH values were a good fit for the pseudo-second-order kinetic model(R2>0.98). At pH 4, adsorption equilibrium was reached in about 3 h, whereas it took 12 h at pH 8. The total amount adsorbed at pH 4 was almost twice of that at pH 8. XPS and ATR-FTIR results consistently indicated that electrostatic interaction and chemical adsorption were the main adsorption mechanisms. LEV was mainly adsorbed in bidentate binuclear form on the goethite surface at low pH(pH<6), and bidentate binuclear at high pH (pH>8). Adsorption capacity was greatest at intermediate pH(pH=6) due to electrostatic repulsion. |
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