Adsorption of Methyl Orange Dye from Aqueous Solutions by Acrylic Composite Resin Chemically Modified with Calcium Lignosulphonate

作者：Xu, Wen-jing^*; Zhang, Wen-sheng; Li, Yan; Zhang, She-li

来源：Acta Polymerica Sinica, 2016, (3): 307-314.

• Calcium lignosulphonate
• Adsorption
• Acrylic composite resin
• Methyl orange
• Modification

Acrylic composite resin modified by calcium lignosulphonate (LSAA) was prepared by solution polymerization using calcium lignosulphonate (LS-Ca) and acrylic acid (AA) as raw materials, and ethylene glycol dimethacrylate (EGDMA) as the cross-linker. LSAA was characterised using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TG) and specific surface analysis. TG result showed that the initial temperature of decomposition was 291.2 degrees C and LSAA was good in thermal stability. LSAA had good adsorption capability to methyl orange (MO) because of the rough surface and abundant mesoporous, as well as the hydroxyl groups on the surface of LSAA. The optimum pH was 3. 0 and LSAA had adsorption capacity of 188.33 mg.g(-1) after 24 hat 298 K. The adsorption of MO on LSAA was an exothermic typical physical adsorption process which was in accordance with both Langmuir and Freundlich isotherm equations. The kinetic study indicated that adsorption followed the pseudo second-order model. Kannan-Sundaram model showed that the adsorption process of MO on LSAA was divided into three stages, the surface adsorption of adsorbent, the slow diffusion of the hole and the slow diffusion of the small hole, and these lines did not pass through the origin, which meant inner diffusion of the particles was not the sole controlling step of adsorption process.

• 出版日期2016-3-3
• 单位焦作师范高等专科学校