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| 纳米零价铁、改性生物炭与牛骨基羟基磷灰石联合修复铀污染土壤研究 |
| Study on the joint remediation of uranium contaminated soil by nano-zero-valent iron, modified biochar and bovine bone hydroxyapatite |
| 投稿时间：2024-11-27 修订日期：2024-11-27 |
| DOI： |
| 中文关键词: 固化剂 铀 形态分步 土壤修复 |
| 英文关键词:Soil fixative U(VI) morphological step-by-step Soil remediation. |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 中文摘要: |
| 本文采用纳米零价铁、改性生物炭、牛骨基羟基磷灰石单独和复配组合固化方法处理人工模拟铀污染土壤，并利用毒性浸出实验（Toxicity Characteristic Leaching Procedure,TCLP）和Tessier逐级化学提取法，评价修复前后铀的浸出特性与形态变化。经实验表明，添加不同固定剂培养30天后，土壤中铀的浸出量降低了9.02%～66.11%，以3种固定剂复合时修复效果最好。在复合固化剂固定不同pH土壤实验中，在土壤pH为5时，TCLP提取态铀含量降低效果最显著，固定效果达到90.83%。XRD和SEM-EDS分析表明，联合使用三种固化剂可以显著降低土壤中铀的活性,这主要是通过溶解/沉淀作用和表面吸附机制实现，将铀转化为稳定的磷酸铀沉淀[Ca(UO2)2(PO4)2?3H2O]或混合重金属矿物。因此，本研究对铀污染土壤的修复是一种较为有效的方法。 |
| 英文摘要: |
| In this article, a combination of nano zero-valent iron, modified biochar, and bovine bone-based hydroxyapatite curing methods alone and in combination were used to treat artificially simulated uranium-contaminated soils, and the Toxicity Characteristic Leaching Procedure (TCLP) and Tessier step-by-step chemical extraction method were used to evaluate the leaching characteristics of uranium before and after remediation and morphological changes before and after remediation. The experiments showed that the leaching of uranium in the soil was reduced by 9.02% to 66.11% after 30 days of incubation with different fixatives, and the best remediation effect was achieved with the combination of three fixatives. In the experiment of fixing different pH soils with composite fixers, the reduction of uranium content in the extracted state of TCLP was most significant when the soil pH was 5, and the fixation effect reached 90.83%.XRD and SEM-EDS analyses showed that the combined use of the three types of fixers could significantly reduce the activity of uranium in the soil, which was mainly achieved through the mechanism of solubilisation/precipitation and surface adsorption, which transformed the uranium into a stable phosphoric acid uranium precipitate [Ca(UO2)2(PO4)2-3H2O] or mixed heavy minerals. Therefore, this study is a more effective method for the remediation of uranium-contaminated soil. |
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