Adsorption removal of congo red onto magnetic cellulose/Fe3O4/activated carbon composite: Equilibrium, kinetic and thermodynamic studies

作者：Zhu, H. -Y.; Fu, Y. -Q.; Jiang, R.^*; Jiang, J. -H.; Xiao, L.; Zeng, G. -M.; Zhao, S. -L.; Wang, Y.

来源：Chemical Engineering Journal, 2011, 173(2): 494-502.

DOI：10.1016/j.cej.2011.08.020

• Cellulose
• Activated carbon
• Azo dye
• Adsorption
• Magnetic material

Magnetic cellulose/Fe3O4/activated carbon composites (m-Cell/Fe3O4/ACCs) were prepared successfully and characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). The adsorption of congo red onto the novel m-Cell/Fe3O4/ACCs was studied as a function of contact time, initial concentration of congo red, adsorbent dosage, and pH of solution. The saturated magnetization of m-Cell/Fe3O4/ACCs reached 48.2 emu g(-1) and the magnetic adsorbent showed characteristics of super-paramagnetism, which indicated that m-Cell/Fe3O4/ACCs could be separated from treated solution by a magnetic process. A comparison of kinetic models showed that the overall adsorption process was best described by pseudo-second-order kinetic model. Thermodynamic analysis indicated an exothermic nature of adsorption and a spontaneous and favorable process. The m-Cell/Fe3O4/ACCs might be a promising candidate of high efficiency, low cost and convenient separation under magnetic field.

• 出版日期2011-9-15
• 单位台州学院; 湖南大学; 武汉大学