Preparation of chitosan/amine modified diatomite composites and adsorption properties of Hg(II) ions | Zendy

Yongqing Fu | Zendy; Yue Huang | Zendy; Jianshe Hu | Zendy; Zhengjie Zhang | Zendy

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Preparation of chitosan/amine modified diatomite composites and adsorption properties of Hg(II) ions

Author(s) -

Yongqing Fu,

Yue Huang,

Jianshe Hu,

Zhengjie Zhang

Publication year - 2018

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2018.018

Subject(s) - adsorption , thermogravimetric analysis , fourier transform infrared spectroscopy , langmuir adsorption model , chitosan , langmuir , chemistry , amine gas treating , ion , nuclear chemistry , scanning electron microscope , materials science , chemical engineering , organic chemistry , composite material , engineering

A green functional adsorbent (CAD) was prepared by Schiff base reaction of chitosan and amino-modified diatomite. The morphology, structure and adsorption properties of the CAD were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and Brunauer Emmett Teller measurements. The effect of pH value, contact time and temperature on the adsorption of Hg(II) ions for the CAD is discussed in detail. The experimental results showed that the CAD had a large specific surface area and multifunctional groups such as amino, hydroxyl and Schiff base. The optimum adsorption effect was obtained when the pH value, temperature and contact time were 4, 25 °C and 120 min, respectively, and the corresponding maximum adsorption capacity of Hg(II) ions reached 102 mg/g. Moreover, the adsorption behavior of Hg(II) ions for the CAD followed the pseudo-second-order kinetic model and Langmuir model. The negative ΔG 0 and ΔH 0 suggested that the adsorption was a spontaneous exothermic process.

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