title: Rapid enrichment of rare-earth metals by carboxymethyl cellulose-based open-cellular hydrogel adsorbent from HIPEs template.
abstract: A series of monolithic open-cellular hydrogel adsorbents based on carboxymethylcellulose (CMC) were prepared through high internal phase emulsions (HIPEs) and used to enrich the rare-earth metals La(3+) and Ce(3+). The changes of pore structure, and the effects of pH, contact time, initial concentration on the adsorption performance were systematically studied. The results show that the as-prepared monolithic hydrogel adsorbents possess good open-cellular framework structure and have fast adsorption kinetics and high adsorption capacity for La(3+) and Ce(3+). The involved adsorption system can reach equilibrium within 30min and the maximal adsorption capacity is determined to be 384.62mg/g for La(3+) and 333.33mg/g for Ce(3+). Moreover, these porous hydrogel adsorbents show an excellent adsorptive reusability for La(3+) and Ce(3+) through five adsorption-desorption cycles. Such a pore hierarchy structure makes this monolithic open-cellular hydrogel adsorbent be an effective adsorbent for effective enrichment of La(3+) and Ce(3+) from aqueous solution.
authors.affiliation: Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Road 18, Lanzhou 730000, PR China; Graduate University of the Chinese Academy of Sciences, Beijing 100049, PR China.
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Road 18, Lanzhou 730000, PR China.
authors.forename: Wenbo
authors.initials: W
authors.lastname: Wang
authors.affiliation: Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Road 18, Lanzhou 730000, PR China; Gansu Key Laboratory for Environmental Pollution Prediction and Control, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, PR China. Electronic address: zhengya@lzu.edu.cn.
authors.forename: Yian
authors.initials: Y
authors.lastname: Zheng
authors.affiliation: Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Road 18, Lanzhou 730000, PR China; Graduate University of the Chinese Academy of Sciences, Beijing 100049, PR China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.affiliation: Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Road 18, Lanzhou 730000, PR China. Electronic address: aqwang@licp.cas.cn.
authors.forename: Aiqin
authors.initials: A
authors.lastname: Wang
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000327:Adsorption; D002266:Carboxymethylcellulose Sodium / Q000737:chemistry*; D002563:Cerium / Q000737:chemistry*; D004655:Emulsions; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007811:Lanthanum / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D016062:Porosity
chemical_list: D000180:Acrylic Resins; D004655:Emulsions; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D002563:Cerium; C006903:carbopol 940; D007811:Lanthanum; D002266:Carboxymethylcellulose Sodium
keywords: Adsorption; Carboxymethylcellulose; HIPEs; Open-cellular hydrogel; Rare earth