文献类型：期刊文献

英文题名：Effects of Fe(II) and humic acid on U(VI) mobilization onto oxidized carbon nanofibers derived from the pyrolysis of bacterial cellulose

作者：Dai, Weisheng[1,2];Wang, Yao[1];Guo, Weijuan[1];Wang, Guofu[1,3];Qiu, Muqing[1]

机构：[1]Shaoxing Univ, Coll Life & Environm Sci, Shaoxing 312000, Peoples R China;[2]Shaoxing Raw Water Grp Co LTD, Shaoxing 312000, Peoples R China;[3]Shaoxing Univ, Yuanpei Coll, Sch Architectural Engn, Shaoxing 312000, Peoples R China

年份：2024

卷号：266

外文期刊名：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES

收录：SCI-EXPANDED(收录号：WOS:001225001600001)、、EI(收录号：20241415840714)、Scopus(收录号：2-s2.0-85189110650)、WOS

语种：英文

外文关键词：Oxidized carbon nanofibers; Adsorption mechanism; U(VI)

外文摘要：The effects of Fe(II) and humic acid on U(VI) immobilization onto oxidized carbon nanofibers (Ox-CNFs, pyrolysis of bacterial cellulose) were investigated by batch, spectroscopic and modeling techniques, with results suggesting that, Ox-CNFs exhibited fast adsorption rate (adsorption equilibrium within 3 h), high adsorption performance (maximum adsorption capacity of 208.4 mg/g), good recyclability (no notable change after five regenerations) in the presence of Fe(II) towards U(VI) from aqueous solutions (e.g., 40 % reduction and 10 % adsorption at pH 8.0), which was attributed to the various oxygen-containing functional groups, excellent chemical stability, large specific surface area and high redox effect. U(VI) adsorption increased with increasing pH from 2.0 to 5.0, then high-level plateau and remarkable decrease were observed at 5.0-6.0 and at pH > 6.0, respectively. According to FT-IR and XPS analysis, a negative correlation between U(VI) reduction and organic in the presence of Fe(II) implied that U(VI) reduction was driven by Fe(II) while inhibited by humic acid. The interaction mechanism of U(VI) on Ox-CNFs was demonstrated to be adsorption and ion exchange at low pH and reduction at high pH according to XPS and surface complexation modeling. These findings filled the knowledge gaps pertaining to the effect of Fe(II) on the transformation and fate of U(VI) in the actual environment. This carbon material with distinctive performance and unique topology offers a potential platform for actual application in environmental remediation.