Nanoscale zero-valent iron/magnetite carbon composites for highly efficient immobilization of U(VI)
Nanoscale zero-valent iron/magnetite carbon composites for highly efficient immobilization of U(VI)
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DOI：
10.1016/j.jes.2018.06.001
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发表时间：
2019-02-01
影响因子：
6.9
通讯作者：
Chen, Changlun
中科院分区：
文献类型：
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作者：
Lv, Zhimin;Yang, Shimin;Chen, Changlun
以黄松和铁前驱体为原料，通过简单煅烧，成功制备了纳米零价铁/磁性碳（NZVI/MC）复合材料。在800 ℃热解的NZVI/MC（NZVI/MC 800）具有更高的NZVI百分比，并显示出更好的抗聚集性和抗氧化性NZVI比在其他温度下制备的样品。将NZVI/MC 800材料用于从水溶液中消除U（VI）。结果表明，NZVI/MC 800对U（VI）的吸附容量为203.94 mg/g。NZVI的存在可将U（VI）快速还原为U（IV），并将U（IV）捕获在多孔生物炭基质中，从而实现了对U（VI）的高效吸附。NZVI/MC样品对U（VI）的去除受溶液pH的强烈影响。NZVI/MC样品在多次循环后也显示出出色的U（VI）去除可重复使用性。这些研究结果表明，NZVI/MC具有很大的潜力，修复含U（VI）废水。(C)2018中国科学院生态环境科学研究中心由爱思唯尔公司出版
Nanoscale zerovalent iron/magnetic carbon (NZVI/MC) composites were successfully synthesized by simply calcining yellow pine and iron precursors. NZVI/MC pyrolyzed at 800 degrees C (NZVI/MC800) had a higher percentage of NZVI and displayed better resistance to aggregation and oxidation of NZVI than samples prepared at other temperatures. The NZVI/ MC800 material was applied for the elimination of U(VI) from aqueous solutions. The results suggested that the NZVI/MC800 displayed excellent adsorption capacity (203.94 mg/g) toward U(VI). The significant adsorption capacity and fast adsorption kinetics were attributed to the presence of well-dispersed NZVI, which could quickly reduce U(VI) into U(IV), trapping the guest U(IV) in the porous biocarbon matrix. The removal of U(VI) on the NZVI/MC samples was strongly affected by solution pH. The NZVI/MC samples also displayed outstanding reusability for U(VI) removal after multiple cydes. These findings indicate that NZVI/MC has great potential for remediation of wastewater containing U(VI). (C) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.