Yawen Cai, FangYuan, Xiaomei Wang, Zhuang Sun, Yang Chen, Zhiyong Liu, Xiangke Wang, Shitong Yang*, Shuao Wang*. "Synthesis of Core-Shell Structured Fe3O4@Car1boxymethyl Cellulose Magnetic Composite for High-Efficient Removal of Eu(III)". Cellulose, 2016, accepted.
Abstract:
In this work, the carboxymethyl cellulose (CMC)-modified Fe3O4 (denoted as Fe3O4@CMC) composite was synthesized via a simple co-precipitation approach. Fourier transform infrared spectroscopy (FTIR), zeta potential and thermogravimetric ****ysis (TGA) results indicated that CMC was successfully coated on the Fe3O4 surfaces with a weight percent of ~30% (w/w). The prepared Fe3O4@CMC composite were stable in acidic solution and could be easily collected with the aid of an external magnet. Batch technique were adopted to check the removal property of Fe3O4@CMC composite towards Eu(III) as a function of various environmental parameters. The sorption kinetics process achieved equilibrium within a contact time of 7 h. The sorption isotherms were well simulated by the Langmuir model and the maximum sorption capacity at 293 K was calculated to be 2.78×10-4 mol/g, being higher than a series of adsorbent materials reported up to date. The ionic strengthindependent sorption behaviors, desorption experiments by using ammonium acetate and disodium ethylenediamine tetraacetate (EDTA-2Na) as well as the spectroscopic characterization suggested that Eu(III) was sequestrated on the hydroxyl and carboxyl sites of Fe3O4@CMC composite via inner-sphere complexation. Overall, Fe3O4@CMC composite could be utilized as a cost-effective adsorbent for the removal of trivalent lanthanide/actinides (e.g., 152+154Eu, 241Am and 244Cm) from radioactive wastewater.
