Adsorption of Reactive blue 21 onto functionalized cellulose under ultrasonic pretreatment: Kinetic and equilibrium study

作者：Ma Qianyun; Wang Lijuan^*

来源：Journal of the Taiwan Institute of Chemical Engineers, 2015, 50: 229-235.

DOI：10.1016/j.jtice.2014.12.018

• Flax shive cellulose
• Modification
• Ultrasonic-pretreatment
• Reactive blue 21
• Adsorption mechanism
• Low-cost adsorbent

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.

• 出版日期2015-5
• 单位东北林业大学