Synthesis of core–shell structured Fe₃O₄@carboxymethyl cellulose magnetic composite for highly efficient removal of Eu(III)

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• 作者：Yawen Cai ; Fang Yuan ; Xiaomei Wang ; Zhuang Sun ; Yang Chen ; Zhiyong Liu…
• 关键词：Fe3O4@CMC ; Eu(III) ; Magnetic separation ; Removal performance ; Sorption mechanisms
• 刊名：Cellulose
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：24
• 期：1
• 页码：175-190
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Bioorganic Chemistry; Physical Chemistry; Organic Chemistry; Polymer Sciences;
• 出版者：Springer Netherlands
• ISSN：1572-882X
• 卷排序：24

文摘

In this work, a carboxymethyl cellulose (CMC)-modified Fe₃O₄ (denoted as Fe₃O₄@CMC) composite was synthesized via a simple co-precipitation approach. Fourier transform infrared spectroscopy, zeta potential and thermogravimetric analysis results indicated that CMC was successfully coated on the Fe₃O₄ surfaces with a weight percent of ~30 % (w/w). The prepared Fe₃O₄@CMC composite was stable in acidic solution and could be easily collected with the aid of an external magnet. A batch technique was adopted to check the ability of the Fe₃O₄@CMC composite to remove Eu(III) as a function of various environmental parameters such as contact time, solution pH, ionic strength, solid content and temperature. 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 the series of adsorbent materials reported to date. The ionic strength-independent sorption behaviors, desorption experiments by using ammonium acetate and disodium ethylenediamine tetraacetate as well as the spectroscopic characterization suggested that Eu(III) was sequestrated on the hydroxyl and carboxyl sites of Fe₃O₄@CMC via inner-sphere complexation. Overall, the 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.