Effects of EDTA and Bicarbonate on U(VI) Reduction by Reduced Nontronite
文献类型：期刊论文
| 作者 | Wang, Shuaidi1,10; Chen, Yu7; Pan, Zezhen5; Liu, Juan2; Ding, Yuefei2; Wang, Yuheng9; Liu, Dong8 ; Wu, Songlin6; Hu, Dafu1,10; Li, Runjie1
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| 刊名 | ENVIRONMENTAL SCIENCE & TECHNOLOGY
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| 出版日期 | 2024-12-18 |
| 卷号 | 58期号:52页码:23031-23041 |
| 关键词 | U(VI) reduction reducednontronite rNAu-2 U(VI)-EDTA complex U(VI)species transformation U(VI)-carbonato complexes |
| ISSN号 | 0013-936X |
| DOI | 10.1021/acs.est.4c09492 |
| 英文摘要 | Widespread Fe-bearing clay minerals are potential materials capable of reducing and immobilizing U(VI). However, the kinetics of this process and the impact of environmental factors remain unclear. Herein, we investigated U(VI) reduction by chemically reduced nontronite (rNAu-2) in the presence of EDTA and bicarbonate. U(VI) was completely reduced within 192 h by rNAu-2 alone, and higher Fe(II) in rNAu-2 resulted in a higher U(VI) reduction rate. However, the presence of EDTA and NaHCO3 initially inhibited U(VI) reduction by forming stable U(VI)-EDTA/carbonato complexes and thus preventing U(VI) from adsorbing onto the rNAu-2 surface. However, over time, EDTA facilitated the dissolution of rNAu-2, releasing Fe(II) into solution. Released Fe(II) competed with U(VI) to form Fe(II)-EDTA complexes, thus freeing U(VI) from negatively charged U(VI)-EDTA complexes to form positively charged U(VI)-OH complexes, which ultimately promoted U(VI) adsorption and triggered its reduction. In the NaHCO3 system, U(VI) complexed with carbonate to form U(VI)-carbonato complexes, which partially inhibited adsorption to the rNAu-2 surface and subsequent reduction. The reduced U(IV) largely formed uraninite nanoparticles, with a fraction present in the rNAu-2 interlayer. Our results demonstrate the important impacts of clay minerals, organic matter, and bicarbonate on U(VI) reduction, providing crucial insights into the uranium biogeochemistry in the subsurface environment and remediation strategies for uranium-contaminated environments. |
| WOS研究方向 | Engineering ; Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:001379963200001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/81914]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Chen, Yu; Dong, Hailiang |
| 作者单位 | 1.China Univ Geosci, Ctr Geomicrobiol & Biogeochem Res, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China 2.Peking Univ, Coll Environm Sci & Engn, Key Lab Water & Sediment Sci, Beijing 100871, Peoples R China 3.Chinese Acad Sci, Inst Microbiol, State Key Lab Microbial Resources, Beijing 100101, Peoples R China 4.CNNC, Beijing Res Inst Chem Engn & Met, Beijing 101149, Peoples R China 5.Fudan Univ, Dept Environm Sci & Engn, Shanghai 200433, Peoples R China 6.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China 7.Tsinghua Univ, Sch Environm, Beijing 100084, Peoples R China 8.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China 9.Northwestern Polytech Univ, Sch Ecol & Environm, Xian 710072, Peoples R China 10.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Shuaidi,Chen, Yu,Pan, Zezhen,et al. Effects of EDTA and Bicarbonate on U(VI) Reduction by Reduced Nontronite[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2024,58(52):23031-23041. |
| APA | Wang, Shuaidi.,Chen, Yu.,Pan, Zezhen.,Liu, Juan.,Ding, Yuefei.,...&Dong, Hailiang.(2024).Effects of EDTA and Bicarbonate on U(VI) Reduction by Reduced Nontronite.ENVIRONMENTAL SCIENCE & TECHNOLOGY,58(52),23031-23041. |
| MLA | Wang, Shuaidi,et al."Effects of EDTA and Bicarbonate on U(VI) Reduction by Reduced Nontronite".ENVIRONMENTAL SCIENCE & TECHNOLOGY 58.52(2024):23031-23041. |
入库方式： OAI收割
来源：广州地球化学研究所
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