Accepted Manuscript Molecular mechanism of anionic dyes adsorption on cationized

ACCEPTED MANUSCRIPT
5 
tetramethylethylenediamine [18] have been used as modifying agents for the 
preparation of cationic cellulose. Quaternized modified cationized cellulose was 
prepared and used as an adsorbent to purify dye wastewater.
For example, a wheat 
straw-based adsorbent was prepared by a chemical modification method using 
cetyltrimethylammonium bromide as a modifier, and the effect of the adsorbent on the 
purification of Congo red dye wastewater was investigated. The adsorption of Congo 
red by wheat straw was stronger than that of unmodified wheat straw [9]. Therefore, 
quaternary ammonium salts are used as a cationization modified agent for the 
modification and derivatization of cellulose to prepare high performance cationized 
cellulose adsorbents for the purification of dye wastewater is feasible, which has good 
values of scientific research and practical application. 
In this study, rice husks was used as raw material to extract and separate the rice 
husks cellulose by alkali treatment and bleaching treatment. The rice husks cellulose 
was modified with N, N-dimethyl-1-octadecylamine as modifying agent to prepare 
cationized rice husks cellulose. The adsorption properties of Diamine Green B 
(DG-B), Acid Black 24 (AB-24), and Congo Red (CR) with different molecular 
structures onto cationized rice husks cellulose were studied. The mechanism of 
molecular interaction between the functional groups in the cationized rice husks 
cellulose molecular structure and the groups in the dye molecular structure were 
discussed. The samples were characterized by Fourier transform infrared spectroscopy 
(FTIR), X-ray diffraction (XRD) and scanning electron microscope (SEM). The 
adsorption kinetics and equilibrium adsorption behaviors were analyzed to understand 
the adsorption mechanism. Thermodynamic parameters were also calculated. 

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