SCI和EI收录∣中国化工学会会刊

›› 2017, Vol. 25 ›› Issue (5): 587-594.DOI: 10.1016/j.cjche.2016.10.010

• Separation Science and Engineering • 上一篇    下一篇

Synthesis of a novel functional group-bridged magnetized bentonite adsorbent: Characterization, kinetics, isotherm, thermodynamics and regeneration

Zhichao Lou1,2, Wei Zhang2, Xiaodan Hu2, Haiqian Zhang2,3   

  1. 1 College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China;
    2 College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    3 State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
  • 收稿日期:2016-06-06 修回日期:2016-10-11 出版日期:2017-05-28 发布日期:2017-07-06
  • 通讯作者: Zhichao Lou,E-mail address:zc-lou2015@njfu.edu.cn
  • 基金资助:
    Supported by the National Natural Science Foundation of China (61601227),the Natural Science Foundation of Jiangsu Province (BK20160939),the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (16KJB180010),the Qing Lan Project and Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

Synthesis of a novel functional group-bridged magnetized bentonite adsorbent: Characterization, kinetics, isotherm, thermodynamics and regeneration

Zhichao Lou1,2, Wei Zhang2, Xiaodan Hu2, Haiqian Zhang2,3   

  1. 1 College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China;
    2 College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    3 State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
  • Received:2016-06-06 Revised:2016-10-11 Online:2017-05-28 Published:2017-07-06
  • Supported by:
    Supported by the National Natural Science Foundation of China (61601227),the Natural Science Foundation of Jiangsu Province (BK20160939),the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (16KJB180010),the Qing Lan Project and Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

摘要: A novel magnetic adsorbent was synthesized by magnetizing bentonite by APTES-Fe3O4 via a functional groupbridged interaction. The characterization of APTES-Fe3O4/bentonite was conducted via transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transform infrared spectrophotometer (FT-IR), thermal gravimetric analysis (TGA), vibrating sample magnetometer (VSM), zeta potential analysis and Brunner-Emmet-Teller (BET). The APTES-Fe3O4/bentonite was assessed as adsorbents for methylene blue (MB) with a high adsorption capacity (91.83 mg·g-1). Factors affecting the adsorption of MB (such as pH, equilibrium time, temperature and initial concentration) were investigated. The adsorption process completely reaches equilibrium after 120 min and the maximum sorption is achieved at pH 8.0. The adsorption trend follows the pseudosecond order kinetics model. The adsorption data gives good fits with Langmuir isotherm model. The parameter factor RL falls between 0 and 1, indicating the adsorption of MB is favorable. The adsorption process is endothermic with positive ΔH0 values. The positive values of ΔG0 confirm the affinity of the adsorbent towards MB, and suggest an increased randomness at the solid-liquid interface during the adsorption process. Regeneration of the saturated adsorbent was easily carried out via gamma-irradiation.

关键词: Adsorption, Magnetize, Kinetics, Isotherm, Thermodynamics

Abstract: A novel magnetic adsorbent was synthesized by magnetizing bentonite by APTES-Fe3O4 via a functional groupbridged interaction. The characterization of APTES-Fe3O4/bentonite was conducted via transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transform infrared spectrophotometer (FT-IR), thermal gravimetric analysis (TGA), vibrating sample magnetometer (VSM), zeta potential analysis and Brunner-Emmet-Teller (BET). The APTES-Fe3O4/bentonite was assessed as adsorbents for methylene blue (MB) with a high adsorption capacity (91.83 mg·g-1). Factors affecting the adsorption of MB (such as pH, equilibrium time, temperature and initial concentration) were investigated. The adsorption process completely reaches equilibrium after 120 min and the maximum sorption is achieved at pH 8.0. The adsorption trend follows the pseudosecond order kinetics model. The adsorption data gives good fits with Langmuir isotherm model. The parameter factor RL falls between 0 and 1, indicating the adsorption of MB is favorable. The adsorption process is endothermic with positive ΔH0 values. The positive values of ΔG0 confirm the affinity of the adsorbent towards MB, and suggest an increased randomness at the solid-liquid interface during the adsorption process. Regeneration of the saturated adsorbent was easily carried out via gamma-irradiation.

Key words: Adsorption, Magnetize, Kinetics, Isotherm, Thermodynamics