标题：Nanoscale zero-valent iron/magnetite carbon composites for highly efficient immobilization of U(VI)
作者：Lv, Zhimin; Yang, Shimin; Chen, Lei; Alsaedi, Ahmed; Hayat, Tasawar; Chen, Changlun
作者机构：[Lv, Zhimin; Yang, Shimin; Chen, Lei] Shandong Univ Technol, Sch Chem & Chem Engn, Zibo 255049, Peoples R China.; [Lv, Zhimin; Chen, Changlun] Chine 更多
通讯作者：Chen, Lei;Chen, L;Chen, CL;Chen, CL;Chen, CL
通讯作者地址：[Chen, L]Shandong Univ Technol, Sch Chem & Chem Engn, Zibo 255049, Peoples R China;[Chen, CL]Chinese Acad Sci, Inst Plasma Phys, CAS Key Lab Photovolt 更多
来源：JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
关键词：U(VI); Carbon; NZVI; Adsorption mechanism; Reduction
摘要：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.