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

Zhichao Lou; Wei Zhang; Xiaodan Hu; Haiqian Zhang

doi:10.1016/j.cjche.2016.10.010

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

Separation Science and Engineering | Updated：2026-01-06

- Synthesis of a novel functional group-bridged magnetized bentonite adsorbent: Characterization, kinetics, isotherm, thermodynamics and regeneration
- Chinese Journal of Chemical Engineering Vol. 25, Issue 5, Pages: 587-594(2017)
- Affiliations：
  
  1. College of Materials Science and Engineering, Nanjing Forestry University,Nanjing,China,210037
  2. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics,Nanjing,China,210016
  3. State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering, Southeast University,Nanjing,China,210096
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2016.10.010
  CLC：
- Published：2017
- Accepted：
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Zhichao Lou, Wei Zhang, Xiaodan Hu, Haiqian Zhang. Synthesis of a novel functional group-bridged magnetized bentonite adsorbent: Characterization, kinetics, isotherm, thermodynamics and regeneration[J]. , 2017, 25(5): 587-594.
DOI：

Zhichao Lou, Wei Zhang, Xiaodan Hu, Haiqian Zhang. Synthesis of a novel functional group-bridged magnetized bentonite adsorbent: Characterization, kinetics, isotherm, thermodynamics and regeneration[J]. , 2017, 25(5): 587-594. DOI： 10.1016/j.cjche.2016.10.010.

摘要

Abstract

A novel magnetic adsorbent was synthesized by magnetizing bentonite by APTES-Fe

via a functional groupbridged interaction. The characterization of APTES-Fe

/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-Fe

/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

falls between 0 and 1

indicating the adsorption of MB is favorable. The adsorption process is endot

hermic with positive Δ

values. The positive values of Δ

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.

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