Cellulose-based ionic liquids as an adsorbent for high selective recovery of gold. (15th August 2018)

• Record Type: Journal Article
• Authors: Guo, Wanghuan; Yang, Fan; Zhao, Zhigang; Liao, Qiuxia; Cai, Chunqing; Zhang, Yang; Bai, Ruixi
• Is Part Of: Minerals engineering. Volume 125(2018)
• Page Start: 271
• Page End: 278
• Publication Date: 2018-08-15
• Subjects: Cellulose-based ionic liquids -- Good swellability -- Selective recovery -- Gold; Mines and mineral resources -- Periodicals; Ressources minérales -- Périodiques; Mines and mineral resources; Periodicals; Electronic journals; 622
• DOI: 10.1016/j.mineng.2018.06.012
• Languages: English
• ISSNs: 0892-6875

Abstract

Graphical abstract: Highlights: The swelling property of DEAEC improves the adsorption rate of the adsorbent. CMDEAEC offers extremely high selectivity for Au(III) from chloride solutions. There is no extraction of Al, Cu, Ga, Gd, Pb, Te, Zn or Fe. CMDEAEC is easily synthesized through a simple mixing reaction and is renewable. Abstract: To achieve an adsorbent that has better absorption and extraction performance, carboxymethyl-diethylammoniumethyl cellulose (CMDEAEC), a low-cost cellulose-based ionic liquid that possesses a nanoscale particle size and good swellability to increase the contact area, was prepared through a one-step reaction. The chemically modified cellulose was verified by Fourier transform infrared spectroscopy, elemental analysis and scanning electron microscopy. As an adsorbent, CMDEAEC was used for selective recovery of metal ions. The effects of pH, adsorbent dose, initial concentration, and contact time on metal ion adsorption were examined. CMDEAEC was found to exhibit selectivity only for Au(III). Additionally, the adsorption process follows the Langmuir isotherm model and the pseudo-second-order kinetics model. Furthermore, the desorption of ions from CMDEAEC and the regeneration capacity of CMDEAEC were investigated. In conclusion, as an efficient, low-cost, easily obtained and environmentally friendly adsorbent, CMDEAEC is expected to be used for the selective recovery of gold.