Article(id=1311351111701856705, tenantId=1146029695717560320, journalId=1146123346816638986, issueId=1311351083973305284, articleNumber=null, orderNo=null, doi=10.13426/j.cnki.yky.2025.03.13, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1742745600000, receivedDateStr=2025-03-24, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1790580068754, onlineDateStr=2026-09-28, pubDate=1763568000000, pubDateStr=2025-11-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1790580068754, onlineIssueDateStr=2026-09-28, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1790580068754, creator=13701087609, updateTime=1790580068754, updator=13701087609, issue=Issue{id=1311351083973305284, tenantId=1146029695717560320, journalId=1146123346816638986, year='2025', volume='44', issue='4', pageStart='1', pageEnd='158', issueExtLink='null', onlineDate='null', pubDate='1763568000000', pubDateStr='2025-11-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1790580062144, creator='13701087609', updateTime=1790583973598, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1311367489863381299, tenantId=1146029695717560320, journalId=1146123346816638986, issueId=1311351083973305284, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1311367489863381300, tenantId=1146029695717560320, journalId=1146123346816638986, issueId=1311351083973305284, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=100, endPage=111, ext={EN=ArticleExt(id=1311351111999652290, articleId=1311351111701856705, tenantId=1146029695717560320, journalId=1146123346816638986, language=EN, title=Research Progress and Mechanism Analysis of OA-nZVI Remediation of Uranium Contaminated Groundwater, columnId=1175805042197152439, journalTitle=Uranium Mining and Metallurgy, columnName=SAFETY AND ENVIRONMENT PROTECTION, runingTitle=null, highlight=null, articleAbstract=

Oxalate modification represents an eco-efficient strategy to address nanoparticle aggregation in nano zero-valent iron (nZVI) systems while synergistically enhancing U (VI) removal through coupled adsorption-reduction mechanisms. This study synthesized sodium oxalate-modified nZVI (OA-nZVI) via liquid-phase reduction. The oxalate coating effectively suppressed particle agglomeration induced by magnetic interactions and van der Waals forces. Systematic investigations were conducted to elucidate the morphological evolution of nZVI post-modification and its mechanistic behavior in uranium-contaminated groundwater remediation. Characterization revealed that OA-nZVI exhibited a transformation from irregular spherical particles to well-defined spherical geometries, accompanied by an increased Fe⁰ content in the mineral phase. Under optimized conditions (pH=5, 25 ℃, dosage=0.5 g/L), OA-nZVI demonstrated exceptional U (VI) removal efficiency. The enhanced performance originates from synergistic interactions: Carboxyl groups on oxalate ligands facilitated uranyl adsorption via surface complexation, and the Fe⁰ core mediated electron transfer for U (VI) reduction to U (IV). Subsequent oxidation generated goethite (α-FeOOH), which further immobilized uranium through hydroxyl coordination. The removal kinetics adhered to a pseudo-second-order model, while equilibrium data fitted the Langmuir isotherm, yielding a maximum theoretical adsorption capacity of 196.31 mg/g. Notably, competitive ions (Al³⁺and ) exhibited significant inhibitory effects, necessitating consideration in field applications.This work provides critical insights for developing advanced uranium remediation materials. Future research directions should prioritize: Evaluating material stability under complex hydrogeochemical conditions (e.g., high salinity with coexisting /), pH=3~10, and humic acid presence), and validating performance through dynamic column experiments simulating groundwater flow regimes and ion exchange processes. These investigations will bridge the gap between laboratory-scale achievements and practical engineering applications.

, authors=Guicheng HE¹, Xianglei WANG¹, Bingxiang HUANG², Qinglin ZHANG³, De LI³, Jianhong MA¹, authorsList=Guicheng HE, Xianglei WANG, Bingxiang HUANG, Qinglin ZHANG, De LI, Jianhong MA, authorCompany=null, correspAuthors=Jianhong MA, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1311351114868556238, articleId=1311351111701856705, tenantId=1146029695717560320, journalId=1146123346816638986, language=CN, title=草酸化纳米零价铁对铀污染地下水的修复行为及机理研究, columnId=1175805042343953080, journalTitle=铀矿冶, columnName=安全·环保, runingTitle=null, highlight=null, articleAbstract=

草酸盐修饰可抑制纳米零价铁（nZVI）团聚，还可通过表面配合作用增强对U（Ⅵ）的吸附-还原协同效能，是一种绿色高效的nZVI修饰方法。通过液相还原法制备了草酸钠改性纳米零价铁（OA-nZVI），在纳米零价铁表面包覆草酸钠减少因磁相互作用与范德华力引起的团聚现象；同时研究了草酸钠改性对nZVI形貌结构的影响，并探讨了其对修复铀污染地下水的行为和内在机理。研究结果显示，经过草酸钠改性后，nZVI由不规则球形转变为更为规则的圆球状，且Fe⁰矿物相含量有所增加。在pH=5的条件下，OA-nZVI对U（Ⅵ）展现出最优的去除效率，当投加量为0.5 g/L时便可实现高效去除。OA-nZVI能够有效去除U（Ⅵ），得益于OA与nZVI的协同作用：其中，羧基配合作用增强了对铀酰的吸附，Fe⁰核则提供电子将U（Ⅵ）还原为U（Ⅳ）；氧化生成的FeOOH的矿物相为针铁矿（α-FeOOH），同时生成的FeOOH可通过羟基配位进一步固定铀。吸附过程符合准二级动力学模型和Langmuir等温模型，最大理论吸附量可达196.31 mg/g。然而，在实际应用过程中，需要特别关注Al³⁺和的抑制作用。本研究可为开发高效的铀污染修复材料提供理论依据和技术参考。后续应针对复杂的地下水环境，进一步探究包覆材料在高盐（共存等）、宽pH（3~10）及腐殖酸作用下的稳定性，并采用动态柱实验模拟地下水流速及离子交换对性能的影响，以期将研究成果更好地应用于实际工程。

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贺桂成（1977—），男，湖南衡阳人，教授，博士生导师，从事溶浸采铀方面的科研与教学工作。

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贺桂成（1977—），男，湖南衡阳人，教授，博士生导师，从事溶浸采铀方面的科研与教学工作。

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