Preparation of elastic diglycolamic-acid modified chitosan sponges and their application to recycling of rare-earth from waste phosphor powder. (15th June 2018)

• Record Type: Journal Article
• Authors: Bai, Ruixi; Yang, Fan; Zhang, Yang; Zhao, Zhigang; Liao, Qiuxia; Chen, Peng; Zhao, Panpan; Guo, Wanghuan; Cai, Chunqing
• Is Part Of: Carbohydrate polymers. Volume 190(2018)
• Page Start: 255
• Page End: 261
• Publication Date: 2018-06-15
• Subjects: Rare-earth -- Recycling -- Chitosan sponges -- Elasticity -- Squeezing & soaking -- Rapid equilibrium; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2018.02.059
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Elastic diglycolamic-acid modified chitosan sponges were applied to recycling of rare-earth. Novel adsorption device: efficient and time-saving "syringe-like" adsorption device. A new solid-liquid contact mode: Squeezing and Soaking. Adsorption equilibrium takes only 10 min. Abstract: Inspired by the phenomenon of sponges soaking up water, a novel syringe-like adsorption device used diglycolamic-acid modified chitosan sponges (CSs-DGAA) as adsorbents is reported for recycling of rare-earth elements (REEs) by Squeezing & Soaking (S&S) operation. Integrating the elasticity of sponges and selective extraction ability of diglycolamic acid groups, the new device can efficiently recycle REEs from aqueous solutions. This device only needs 10 min to achieve adsorption equilibrium; squeezing the water from the sponges achieves solid-liquid separation. This syringe-like adsorption method not only solves the pollution problem caused by the organic solvents used during liquidliquid extractions, but also improves the time needed to achieve adsorption equilibrium and uses significantly less energy than energy intensive solid-phase extractions of solid-liquid separations. Moreover, the environment-friendly adsorbents effectively recycle yttrium and europium from waste phosphor powders. These experimental results demonstrated that the S&S method based on polymeric sponges has potential application in hydrometallurgy and environmental remediation.