鼠李糖脂改性纳米零价铁去除地浸采铀矿山污染地下水中U(Ⅵ)的试验研究

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中文摘要：采用液相还原法制备了鼠李糖脂改性纳米零价铁(RL@nZVI),并利用X射线衍射、透射电子显微镜、傅立叶红外光谱等方法对其进行表征;研究pH值、反应时间、干扰离子等因素对纳米材料除铀效果的影响;运用吸附动力学模型及表征等手段,对其修复机理进行解释说明.研究结果表明:鼠李糖脂成功负载于Fe0表面,可以有效提高纳米材料的抗氧化性和分散性,比表面积提高约2.5倍,达到12.30 m2/g;当pH=5,反应时间为30 min时,RL0.1@nZVI与RL0.2@nZVI试验组中铀浓度分别降至33.8,24.4 μg/L,达到国家排放标准;不同浓度的金属离子对改性纳米材料去除铀效果有不同程度的影响,Cu2+、Mg2+、Mn2+、Zn2+各试验组平衡铀去除率分别为28.26％,95.82％,93.39％,96.28％;吸附动力学结果表明,准二级动力学方程更适合描述nZVI(R2=0.999)和RL0.1@nZVI(R2=0.998)的吸附过程,该过程中存在化学吸附反应;对吸附后的RL0.1@nZV I进行表征,反应物中U(Ⅳ)与U(Ⅵ)的比例为7∶1,Fe2+与Fe3+的比例约为2∶1,这表明在RL0.1@nZVI修复铀污染地下水过程中发生了氧化还原、吸附及共沉淀反应;RL@nZVI是处理铀污染地下水的理想材料.

外文标题：Removing U(Ⅵ)from the polluted groundwater in in-situ leach uranium mine by rhamnolipid modified nZVI

外文摘要：In this paper,rhamnolipid modified nanoscale zero-valent iron(RL@nZVI)was prepared by liquid phase reduction method and characterized by X-ray diffraction,transmission electron microscopy,and Fourier infrared spectroscopy.The effects of pH,reaction time,interfering ions and other factors on uranium removal were studied.The adsorption kinetic model and characterization results were used to ex-plain the uranium removal mechanism.The results showed that the successful loading of rhamnolipid on the Fe0 surface could effectively improve the oxidation resistance and dispersion of nanomaterials,and the specific surface area was increased by about 2.5 times,reaching 12.30 m2/g.When the pH value was 5 and the reaction time was 30 min,the uranium concentration in the RL0.1@nZVI and RL0.2@nZ-VI experimental groups was reduced to 33.8 μg/L and 24.4 μg/L,respectively,which reached the na-tional emission standard.Different concentrations of metal ions had different degrees of influence on the uranium removal,and the equilibrium uranium removal rates of Cu2+,Mg2+,Mn2+and Zn2+experimental groups were 28.26％,95.82％,93.39％and 96.28％,respectively.The adsorption kinetic results showed that the quasi-second-order kinetic equation was more suitable for describing the adsorption processes of nZVI(R2=0.999)and RL0.1@nZVI(R2=0.998).The RL0.1@nZVI after uranium ad-sorption was characterized,and the results showed that the ratio of U(Ⅳ)to U(Ⅵ)in the RL0.1@nZVI was 7∶1,and the ratio of Fe2+to Fe3+was about 2∶1,indicating that redox,adsorption and co-precipita-tion reactions occurred during the remediation of uranium-contaminated groundwater by RL0.1@nZVI.RL@nZVI is an ideal material for treating uranium-contaminated groundwater.

外文关键词：

uranium-contaminated groundwaterrhamnolipidsnanoscale zero-valent ironadsorption

作者：

李峰、丁德馨、周函、杨迎春、贺桂成、马建洪、丁洋、胡南、张辉、蒋国清、谭韬

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作者单位：

南华大学铀矿冶生物技术国防重点学科实验室,湖南衡阳 421001

南华大学极贫铀资源绿色开发技术湖南省重点实验室,湖南衡阳 421001

湖南省地质地理信息所,湖南长沙 410021

关键词：

铀污染地下水鼠李糖脂纳米零价铁吸附

基金：

国家重点研发计划国家自然科学基金核技术创新联合基金重点项目国家自然科学基金国家自然科学基金国家自然科学基金湖南省重点领域研发计划重点研发项目湖南省教育厅青年项目

项目编号：

2021YFC2902104U19672105197416352274127121051382022SK207720B510

出版年：

2024

DOI：

10.13545/j.cnki.jmse.2023.0474

采矿与安全工程学报

中国矿业大学中国煤炭工业劳动保护科学技术学会

采矿与安全工程学报

CSTPCD北大核心

影响因子：2.054

ISSN：1673-3363

年,卷(期)：2024.41(1)

参考文献量37