STPP-nZVI修复铀污染地下水的性能及机理研究  

Performance and Mechanism Study of STPP-nZVI for Remediation of Uranium-contaminated Groundwater

作　　者：贺桂成 崔佳欣 张辉 张沈平 HE Guicheng;CUI Jiaxin;ZHANG Hui;ZHANG Shenping(School of Resource Environment and Safety Engineering,University of South China,Hengyang 421001,China)

机构地区：[1]南华大学资源环境与安全工程学院,湖南衡阳421001

出　　处：《铀矿冶》2024年第3期74-85,共12页Uranium Mining and Metallurgy

基　　金：国家重点研发计划项目(2021YFC2902104);国家自然科学基金项目(51974163,52274127)。

摘　　要：铀是一种重要的战略资源,同时也是一种具有化学毒性和放射性毒性的重金属元素。目前,对铀矿山地下水中铀的高效修复仍是环境保护和生态安全面临的巨大挑战。采用三聚磷酸钠对纳米零价铁改性,成功制备了三聚磷酸钠改性纳米零价铁(STPP-nZVI),研究了溶液pH、STPP-nZVI用量、温度、时间、U(Ⅵ)浓度和干扰离子对STPP-nZVI修复地下水中U(Ⅵ)的影响,并采用FTIR、SEM-Mapping和XPS探讨了STPP-nZVI修复铀污染地下水的机理。结果表明,STPP-nZVI适合处理弱酸性和碱性铀污染地下水,在pH=5.0时,STPP-nZVI对U(Ⅵ)的最大吸附量达102.72 mg/g,对U(Ⅵ)的吸附为自发的吸热过程,STPP-nZVI对铀的去除主要归功于吸附和还原作用。STPP-nZVI材料对于处理弱酸性和碱性铀污染地下水具有一定的应用前景。Uranium is an important strategic resource as well as a heavy metal element with chemical and radioactive toxicity.Currently,the efficient remediation of uranium in groundwater from uranium mines remains a huge challenge for environmental protection and ecological security.In this study,sodium tripolyphosphate was used to modify nano zero-valent iron(nZVI),successfully preparing STPP-nZVI.The effects of solution pH,STPP-nZVI dosage,temperature,time,U(VI)concentration,and interfering ions on the STPP-nZVI-mediated remediation of U(VI)in groundwater were investigated.FTIR,SEM-Mapping,and XPS were employed to explore the mechanism underlying STPP-nZVI’s remediation of uranium-contaminated groundwater.The results indicate that STPP-nZVI is suitable for treating weakly acidic and alkaline uranium-contaminated groundwater.At a pH of 5.0,the maximum adsorption capacity of STPP-nZVI for U(VI)reached 102.72 mg/g,with U(VI)adsorption occurring as a spontaneous endothermic process.The removal of uranium by STPP-nZVI is primarily attributed to adsorption and reduction.STPP-nZVI materials demonstrate promising application prospects for treating weakly acidic and alkaline uranium-contaminated groundwater.

关 键 词：纳米零价铁 三聚磷酸钠 铀 地下水 地下水修复 

分 类 号：X591[环境科学与工程—环境工程] TL941[核科学技术—辐射防护及环境保护]