Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, People's Republic of China.
Environ Sci Pollut Res Int. 2023 Apr;30(18):53605-53615. doi: 10.1007/s11356-023-26147-6. Epub 2023 Mar 2.
Nitrate pollution in groundwater is becoming more serious, which is harmful to human health. The reduced graphene oxide supported nanoscale zero-valent iron (nZVI/rGO) composite prepared in this paper can effectively remove nitrate in groundwater. In situ remediation of nitrate-contaminated aquifer was also studied. The results showed that NH-N was the main product of NO-N reduction, and N and NH were also produced. When the dosage of rGO/nZVI was more than 0.2 g/L, there was no accumulation of intermediate NO-N during the reaction process. NO-N was removed by rGO/nZVI mainly through physical adsorption and reduction process with the maximum adsorbing ability of 37.44 mg NO-N/g. After the slurry of rGO/nZVI was injected into the aquifer, a stable reaction zone could be formed. NO-N could be removed continuously within 96 h at the simulated tank, and NH-N and NO-N were as the main reduction products. Moreover, the concentration of TFe near the injection well increased rapidly after rGO/nZVI injection, and could be detected at the downstream end, indicating that the reaction range was large enough for NO-N removal.
地下水硝酸盐污染问题日益严重，对人类健康构成威胁。本文制备的负载型纳米零价铁复合材料（nZVI/rGO）可有效去除地下水中的硝酸盐。同时，还对硝酸盐污染含水层的原位修复进行了研究。结果表明，NO3-还原的主要产物为 NH4+-N，同时还生成了 N2和 NH3。当 rGO/nZVI 投加量大于 0.2 g/L 时，反应过程中无中间态 NO3--N 积累。rGO/nZVI 主要通过物理吸附和还原过程去除 NO3-，最大吸附能力为 37.44 mg NO3-/g。rGO/nZVI 注入含水层后，可在模拟罐中连续 96 h 去除 NO3-，NH4+-N 和 NO2--N 为主要还原产物。此外，rGO/nZVI 注入后注水井附近 TFe 浓度迅速增加，并在下游检测到，表明反应范围足以去除 NO3-。
