The equilibrium and fixed-bed study of malachite green adsorption on chitosan hydrogels | Zendy

Xinning Song | Zendy; Kheng Lim Goh | Zendy; Kean Wang | Zendy

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The equilibrium and fixed-bed study of malachite green adsorption on chitosan hydrogels

Author(s) -

Xinning Song,

Kheng Lim Goh,

Kean Wang

Publication year - 2019

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.2019.160

Subject(s) - malachite green , adsorption , chitosan , mass transfer , chemistry , chemical engineering , oxalate , precipitation , kinetics , malachite , chromatography , materials science , inorganic chemistry , organic chemistry , copper , physics , quantum mechanics , meteorology , engineering

Chitosan hydrogel beads were prepared by a precipitation process, and were used to investigate the adsorption of malachite green (MG) oxalate under various conditions. It was found that adsorption equilibrium was most sensitive to the pH value at pH <8 while fixed bed breakthrough kinetics presented asymmetric S-shaped profiles which could not be adequately described by conventional models such as Adams-Bohart and Yoon-Nelson. The possible reasons were discussed and an improved Adams-Bohart model was proposed to better describe the changes in mass transfer mechanisms during adsorption.

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