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

doi:10.1016/j.cjche.2016.10.010

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

• Separation Science and Engineering • Previous Articles Next Articles

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

Zhichao Lou^1,2, Wei Zhang², Xiaodan Hu², Haiqian Zhang^2,3

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:2017-07-06 Published:2017-05-28
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).

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

Zhichao Lou^1,2, Wei Zhang², Xiaodan Hu², Haiqian Zhang^2,3

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

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).

Abstract

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 R_L 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

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 R_L 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

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.

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

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

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