Self-Peristaltic Gel-Microspheres Based on Carboxymethyl Cellulose and Polyacrylic Acid Prepared via Inverse Suspension
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FUNCTIONAL POLYMERS
Self-Peristaltic Gel-Microspheres Based on Carboxymethyl Cellulose and Polyacrylic Acid Prepared via Inverse Suspension for Recovery Rare Earth Ions from Aqueous Solution Yang Caia, Wenjun Luoa,*, Jinlong Mua, Tiantian Luoa, Jin Weia, and Yunlong Xiaoa aFaculty
of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074 China *e-mail: [email protected] Received February 20, 2020; revised May 12, 2020; accepted May 28, 2020
Abstract—In this study, cross-linked microspheres formed by interpenetrating networks of carboxymethyl cellulose and polyacrylic acid were prepared via inverse-suspension polymerization. The resultant has high adsorption capacity for rare earth ions, can reach 313 mg/g for Ce3+ under the condition of pH 6 at normal temperature. Unique self-creep characteristic gives it a fast-speed adsorption performance, which makes it to reach adsorption equilibrium within 70 min. It also has good reuse performance; its adsorption capacity decrease rate is only 21% after six adsorption–desorption cycles. Adsorption kinetics and thermodynamic studies and adsorption isothermal analysis were researched as well. The research conclusion suggested that this adsorbent is a promising adsorbent for recovering the rare earth ions from wastewater containing rare earth. And all related experiments show that ISP method is effective for making spherical macromolecular adsorbents via water-soluble monomers. DOI: 10.1134/S1560090420050024
INTRODUCTION
reduce ecological environmental damage and risk of public health problems in the future [16, 19]. Among various technologies for the capturing of rare earths from wastewater, the adsorption process has been considered to be one of the most promising technologies because it is economical, efficient and socially acceptable [20–26]. For adsorption, the key is adsorbent, and the material of adsorbent is the most important [27]. Biomass material is non-toxic, harmless, degradable and renewable, natural biomass material and its derivatives are green and cheap [28, 29]. Cellulose is the most abundant natural macromolecular material via photosynthesis with a short regeneration period on earth, which yield is estimated about 830 million metric tons per annum in the world [30– 32]. Carboxymethyl cellulose (CMC) is a representative cellulose derivative, which is a water soluble cellulose ether formed by etherification [33–35], it has a wide range of applications in flocculation, drag reduction, detergents, textiles, paper, foods, drugs, and oil well drilling operation [36, 37], CMC is rich in carboxy groups which has good cation exchange function. The adsorption is an interface behavior, the groups with adsorption function must be distributed on the fixed interface in contact with the liquid phase [38– 41]. The adsorption efficiency depends on the matrix’s specific surface area and the number of adsorption sites on it [42, 43]. Because of this reason, the problem when selecting materials used as adsorbents is that no
Rare-earth elements (REEs)
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