Performance and Mechanism Study of STPP-nZVI for Remediation of Uranium-contaminated Groundwater
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,so-dium 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)concentra-tion,and interfering ions on the STPP-nZVI-mediated remediation of U(Ⅵ)in groundwater were in-vestigated.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-nZ-VI 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 appli-cation prospects for treating weakly acidic and alkaline uranium-contaminated groundwater.
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