LAUSR

Cationized Eucalyptus wood chips cellulose (DEC, HEC and OEC) were prepared via grafting with a quaternary ammonium group using N,N-dimethyl-1-dodecylamine, N,N-dimethyl-1-hexadecylamine or N,N-dimethyl-1-octadecylamine as modification agents onto Eucalyptus wood chips cellulose (EC) microstructure. The characterization results showed that the molecular structure and morphology of EC changed with the quaternary ammonium group being successfully grafted onto the EC molecular structure. DEC, HEC and OEC with the same degree of substitution were selected as adsorbents for the adsorption of Acid Blue 93 dye to evaluate the dye adsorption performance and mechanism of cationized cellulose with different molecular structures. The adsorption process was well-described by pseudo-second-order and Langmuir models. We found that the adsorption capacity increased with the increasing length of the alkyl chain of the DEC, HEC and OEC. The adsorbents exhibited high reusability and high adsorption performance for dye removal. Thermodynamic parameters indicated that the adsorption process is a spontaneous and feasible process, and that increasing the temperature is conducive to the adsorption process.