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Magnetic activated carbon from spent coffee grounds: iron-catalyzed CO2 activation mechanism and adsorption of antibiotic lomefloxacin from aqueous medium.
Li, Zhili; Jiang, Tianxiang; Huo, Hanxin; Zhang, Yizhong; Wang, Xunliang; Guo, Jian; Ma, Yuhui.
Afiliación
  • Li Z; Research Team for Environmental Functional Materials, Department of Environmental Technology, The Institute of Seawater Desalination and Multipurpose Utilization (ISDMU), Ministry of Natural Resources of the People's Republic of China, Tianjin, 300192, China.
  • Jiang T; School of Environmental Science and Engineering, Tiangong University, Tianjin, 300387, China.
  • Huo H; School of Environmental Science and Engineering, Tiangong University, Tianjin, 300387, China.
  • Zhang Y; Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment of the People's Republic of China, Beijing, 100012, China.
  • Wang X; School of Environmental Science and Engineering, Tiangong University, Tianjin, 300387, China.
  • Guo J; School of Environmental Science and Engineering, Tiangong University, Tianjin, 300387, China.
  • Ma Y; Shandong Sihai Water, Treatment Equipment Co., Ltd, Weifang, 262500, Shandong, China.
Environ Sci Pollut Res Int ; 31(3): 4140-4153, 2024 Jan.
Article en En | MEDLINE | ID: mdl-38102422
ABSTRACT
The facile fabrication of low-cost adsorbents possessing high removal efficiency and convenient separation property is an urgent need for water treatment. Herein, magnetic activated carbon was synthesized from spent coffee grounds (SCG) by Fe-catalyzed CO2 activation at 800 °C for 90 min, and magnetization and pore formation were simultaneously achieved during heat treatment. The sample was characterized by N2 adsorption-desorption, XRD, VSM, SEM, and FTIR. Batch adsorption experiments were conducted using lomefloxacin (LMO) as the probing pollutant. Preparation mechanism was revealed by TG-FTIR and XRD. Experimental results showed that Fe3O4 derived from Fe species can be reduced to Fe by carbon at high temperatures, followed by subsequent reoxidation to Fe3O4 by CO2, and the redox cycle between Fe and Fe3O4 favored the formation of pores. The promotion effects of Fe species on CO2 activation can be quantitatively reflected by the yield of CO as the signature gaseous product, and the suitable activation temperate range was determined to be 675 to 985 °C. The BET surface area, total pore volume, and saturated magnetization value of the product were 586 m2 g-1, 0.327 cm3 g-1, and 11.59 emu g-1, respectively. The Langmuir model was applicable for the adsorption isotherm data for LMO with the maximum adsorption capacity of 95 mg g-1, and thermodynamic analysis revealed that the adsorption process was endothermic and spontaneous. This study demonstrated that Fe-catalyzed CO2 activation was an effective method of converting SCG into magnetic separable adsorbent for LMO removal from aqueous medium.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Fluoroquinolonas / Antibacterianos Idioma: En Revista: Environ Sci Pollut Res Int Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Fluoroquinolonas / Antibacterianos Idioma: En Revista: Environ Sci Pollut Res Int Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania