Mechanically activated starch magnetic microspheres for Cd(II) adsorption from aqueous solution

doi:10.1016/j.cjche.2020.06.003

中国化学工程学报 ›› 2021, Vol. 33 ›› Issue (5): 40-49.DOI: 10.1016/j.cjche.2020.06.003

• Separation Science and Engineering • 上一篇下一篇

Mechanically activated starch magnetic microspheres for Cd(II) adsorption from aqueous solution

Xinling Xie¹, Xiaona Zhao¹, Xuan Luo¹, Tongming Su¹, Youquan Zhang¹, Zuzeng Qin¹, Hongbing Ji^1,2

1 School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning 530004, China;
2 Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China

收稿日期:2020-04-10 修回日期:2020-06-03 出版日期:2021-05-28 发布日期:2021-08-19
通讯作者: Zuzeng Qin, Hongbing Ji
基金资助:
This work was supported by the National Natural Science Foundation of China (21766001, 21961160741), Guangxi Natural Science Foundation of China (2018GXNSFAA281342), the Dean Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology (2018Z009), and Special funding for "Guangxi Bagui Scholars".

Mechanically activated starch magnetic microspheres for Cd(II) adsorption from aqueous solution

Xinling Xie¹, Xiaona Zhao¹, Xuan Luo¹, Tongming Su¹, Youquan Zhang¹, Zuzeng Qin¹, Hongbing Ji^1,2

1 School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning 530004, China;
2 Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China

Received:2020-04-10 Revised:2020-06-03 Online:2021-05-28 Published:2021-08-19
Contact: Zuzeng Qin, Hongbing Ji
Supported by:
This work was supported by the National Natural Science Foundation of China (21766001, 21961160741), Guangxi Natural Science Foundation of China (2018GXNSFAA281342), the Dean Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology (2018Z009), and Special funding for "Guangxi Bagui Scholars".

摘要/Abstract

摘要： Magnetic starch microspheres (AAM-MSM) were synthesized via an inverse emulsion graft copolymerization by using mechanically activated cassava starch (MS) as a crude material, acrylic acid (AA) and acrylamide (AM) as graft copolymer monomers, and methyl methacrylate (MMA) as the dispersing agent and used as an adsorbent for the removal of Cd(II) ions from aqueous solution. Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and vibrating sample magnetometry (VSM) were used to characterize the AAM-MSM adsorbent. The results indicated that AA, AM, and MMA were grafted to the MS, and the Fe₃O₄ nanoparticles were encapsulated in the AAM-MSM adsorbent microspheres. The adsorbent exhibited a smooth surface, uniform size, and good sphericity because of the addition of the MMA and provided more adsorption sites for the Cd(II) ions. The maximum adsorption capacity of Cd(II) on the AAM-MSM was 39.98 mg·g^-1. The adsorbents were superparamagnetic, and the saturation magnetization was 16.7 A·m²·kg^-1. Additionally, the adsorption isotherms and kinetics of the adsorption process were further investigated. The process of Cd(II) ions adsorbed onto the AAM-MSM could be described more favorably by the pseudo-second-order kinetic and Langmuir isothermal adsorption models, which suggested that the chemical reaction process dominated the adsorption process for the Cd(II) and chemisorption was the rate-controlling step during the Cd(II) removal process.

关键词: Mechanical activation, Magnetic starch microspheres, Cadmium ion, Adsorption, Separation, Model

Abstract: Magnetic starch microspheres (AAM-MSM) were synthesized via an inverse emulsion graft copolymerization by using mechanically activated cassava starch (MS) as a crude material, acrylic acid (AA) and acrylamide (AM) as graft copolymer monomers, and methyl methacrylate (MMA) as the dispersing agent and used as an adsorbent for the removal of Cd(II) ions from aqueous solution. Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and vibrating sample magnetometry (VSM) were used to characterize the AAM-MSM adsorbent. The results indicated that AA, AM, and MMA were grafted to the MS, and the Fe₃O₄ nanoparticles were encapsulated in the AAM-MSM adsorbent microspheres. The adsorbent exhibited a smooth surface, uniform size, and good sphericity because of the addition of the MMA and provided more adsorption sites for the Cd(II) ions. The maximum adsorption capacity of Cd(II) on the AAM-MSM was 39.98 mg·g^-1. The adsorbents were superparamagnetic, and the saturation magnetization was 16.7 A·m²·kg^-1. Additionally, the adsorption isotherms and kinetics of the adsorption process were further investigated. The process of Cd(II) ions adsorbed onto the AAM-MSM could be described more favorably by the pseudo-second-order kinetic and Langmuir isothermal adsorption models, which suggested that the chemical reaction process dominated the adsorption process for the Cd(II) and chemisorption was the rate-controlling step during the Cd(II) removal process.

Key words: Mechanical activation, Magnetic starch microspheres, Cadmium ion, Adsorption, Separation, Model

Xinling Xie, Xiaona Zhao, Xuan Luo, Tongming Su, Youquan Zhang, Zuzeng Qin, Hongbing Ji. Mechanically activated starch magnetic microspheres for Cd(II) adsorption from aqueous solution[J]. 中国化学工程学报, 2021, 33(5): 40-49.

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Mechanically activated starch magnetic microspheres for Cd(II) adsorption from aqueous solution

Mechanically activated starch magnetic microspheres for Cd(II) adsorption from aqueous solution

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