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Effective removal of two fluoroquinolone antibiotics by PEG-4000 stabilized nanoscale zero-valent iron supported onto zeolite (PZ-NZVI).
Zhao, Jing; Yang, Xing; Liang, Guiwei; Wang, Zhaowei; Li, Shan; Wang, Zirun; Xie, Xiaoyun.
Afiliação
  • Zhao J; College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province 730000, China.
  • Yang X; College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province 730000, China.
  • Liang G; College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province 730000, China.
  • Wang Z; College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province 730000, China. Electronic address: wangzw@lzu.edu.cn.
  • Li S; College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province 730000, China.
  • Wang Z; College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province 730000, China.
  • Xie X; College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province 730000, China.
Sci Total Environ ; 710: 136289, 2020 Mar 25.
Article em En | MEDLINE | ID: mdl-31923667
In this work, nanoscale zero-valent iron (NZVI) was synthesized via liquid phase reduction method with surfactant polyethylene glycol (PEG-4000) modified and supported onto zeolite to prepare PZ-NZVI composite. SEM-EDS, XPS, BET.etc. characterizations indicated that the sphere NZVI particles were loaded on the zeolite successfully and the aggregation was restrained. The adsorption performance of PZ-NZVI for norfloxacin (NOR) or ofloxacin (OFL), two typical fluoroquinolones (FQs), from water was conducted. The equilibrium studies were demonstrated using Langmuir, Freundlich, Temkin and Elovich isotherms and better agreement was attained with the Temkin model. Compared with NZVI and zeolite, PZ-NZVI had higher FQs removal efficiency, and the Langmuir maximum adsorption capacity was 54.67 mg g-1 (NOR) and 48.88 mg g-1 (OFL). The kinetic parameters displayed that two FQs adsorption onto PZ-NZVI followed pseudo-second-order kinetic model. The thermodynamic analysis suggested the adsorption process was spontaneous and exothermic. In addition, the adsorption tests were executed at different influence factors and the adsorbent PZ-NZVI was suitable for a wide pH range (4-10) with the FQs (10 mg L-1) removal efficiency above 90% in 1 h. Furthermore, it was found that PZ-NZVI can be effortlessly separated from mixed solutions using external magnetic field. Finally, the process of FQs adsorbed onto PZ-NZVI was attributed to the surface complexion (forming bidentate complexes), hydrophobic interaction, pore filling and electrostatic interaction.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Zeolitas Tipo de estudo: Prognostic_studies Idioma: En Ano de publicação: 2020 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Zeolitas Tipo de estudo: Prognostic_studies Idioma: En Ano de publicação: 2020 Tipo de documento: Article