期刊
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
卷 50, 期 -, 页码 229-235出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jtice.2014.12.018
关键词
Flax shive cellulose; Modification; Ultrasonic-pretreatment; Reactive blue 21; Adsorption mechanism; Low-cost adsorbent
资金
- Fundamental Research Funds for the Central Universities [DL12DB04]
Cellulose was separated from flax shive and modified by quaternization under ultrasonic pretreatment for the removal of Reactive blue 21 (R-21). The modified cellulose was characterized by using FTIR, XPS, C-13 NMR, XRD and SEM. Batch adsorption was conducted. The adsorption data were fitted with kinetic models including the pseudo-first-model, pseudo-second-model, Elovich equation and Intraparticle diffusion. The adsorption equilibrium was analyzed by using the Langmuir, Freundlich and Temkin isotherms. After modification, cellulose was cross-linked by double quaternary ammonium groups or grafted with -N+-C-C-N- structure. The crystalline structure of cellulose was destroyed and the surface morphologies changed obviously after the modification. The substitution degree was 0.216. The maximum reached adsorption capacity of R-21 on the modified cellulose from flax shive (MCFS) was 543 mg/g. The adsorption process and equilibrium of R-21 were well fitted by a pseudo-second-order kinetic model and Langmuir model, respectively. The adsorption is endothermic, spontaneous, and a chemically controlled process. (C) 2015 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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