Removal of anionic azo dyes from aqueous solution by functional ionic liquid cross-linked polymer

• Published in: Journal of hazardous materials Vol. 261; pp. 83 - 90
• Main Authors: Gao, Hejun, Kan, Taotao, Zhao, Siyuan, Qian, Yixia, Cheng, Xiyuan, Wu, Wenli, Wang, Xiaodong, Zheng, Liqiang
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15-10-2013; Elsevier
• Subjects: Adsorption; Amaranth Dye - chemistry; Applied sciences; Azo Compounds - chemistry; Azo dye; Benzenesulfonates - chemistry; Chemical engineering; Coloring Agents - chemistry; Exact sciences and technology; Hydrogen-Ion Concentration; Imidazoles - chemistry; Ionic liquid; Ionic Liquids - chemistry; Kinetics; Pollution; Polymers; Solutions; Water Pollutants, Chemical - chemistry; Water Purification - methods; Adsorption; Polymers; Azo dye; Ionic liquid; Scanning electron microscopy; Second order; Thermogravimetry; Adsorption capacity; Modeling; Physisorption; Chlorides; pH; Kinetics; Aqueous solution; Fourier-transformed infrared spectrometry; Physicochemical properties
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2013.07.001

•Equilibrium, kinetic and thermodynamic of adsorption of dyes onto PDVB-IL was investigated.•PDVB-IL has a high adsorption capacity to treat dyes solution.•Higher adsorption capacity is due to the functional groups of PDVB-IL.•Molecular structure of dyes influences the adsorption capacity.
A novel functional ionic liquid based cross-linked polymer (PDVB-IL) was synthesized from 1-aminoethyl-3-vinylimidazolium chloride and divinylbenzene for use as an adsorbent. The physicochemical properties of PDVB-IL were investigated by Fourier transform infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis. The adsorptive capacity was investigated using anionic azo dyes of orange II, sunset yellow FCF, and amaranth as adsorbates. The maximum adsorption capacity could reach 925.09, 734.62, and 547.17mg/g for orange II, sunset yellow FCF and amaranth at 25°C, respectively, which are much better than most of the other adsorbents reported earlier. The effect of pH value was investigated in the range of 1–8. The result shows that a low pH value is found to favor the adsorption of those anionic azo dyes. The adsorption kinetics and isotherms are well fitted by a pseudo second-order model and Langmuir model, respectively. The adsorption process is found to be dominated by physisorption. The introduction of functional ionic liquid moieties into cross-linked poly(divinylbenzene) polymer constitutes a new and efficient kind of adsorbent.