Institute of International Rivers and Eco-security, Yunnan University, Kunming, 650500, China.
Institute of Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming, 650500, China.
Environ Sci Pollut Res Int. 2022 Oct;29(49):74319-74334. doi: 10.1007/s11356-022-20765-2. Epub 2022 May 30.
Echinacea purpurea (L.) Moench was selected as a remediation plant in this study, and different concentrations of graphene oxide (GO) were added to Cd-contaminated soil. Through pot experiments, the effect of E. purpurea on Cd-contaminated soil was determined at 60 days, 120 days, and 150 days. A preliminary study on the remediation mechanism of GO was explored through changes in the forms of Cd in the rhizosphere soil, soil pH, and soil functional groups. Results showed that the optimal concentration of GO was 0.4 g/kg, and under the condition, the accumulation of Cd in the roots of E. purpurea was as high as 113.69 ± 23.86 mg/kg, and the maximum EF reached 5.87 ± 1.34. Compared with those of the control group, accumulated Cd concentration and EF in the roots increased by 60.34% and 2.32, respectively. Correlation analysis showed that the absorption and accumulation of Cd was negatively correlated with the exchangeable Cd content at 120 days, and the exchangeable Cd was negatively correlated with the relative content of functional groups in the soil with 0.4 g/kg GO (E2). The artificial application of GO to the soil can be used as an effective way to improve the effect of E. purpurea in the remediation of Cd soil pollution, and it has great application potential in the stabilization of plants and vegetations and restoration of high-concentration Cd-contaminated soil.
紫锥菊（L.）Moench 被选为本研究中的修复植物，并向镉污染土壤中添加不同浓度的氧化石墨烯（GO）。通过盆栽实验，在 60 天、120 天和 150 天，测定了紫锥菊对镉污染土壤的影响。通过根际土壤中镉的形态变化、土壤 pH 值和土壤功能基团的变化，初步探讨了 GO 的修复机制。结果表明，GO 的最佳浓度为 0.4 g/kg，在此条件下，紫锥菊根中 Cd 的积累量高达 113.69±23.86mg/kg，最大 EF 达到 5.87±1.34。与对照组相比，根中积累的 Cd 浓度和 EF 分别增加了 60.34%和 2.32。相关性分析表明，120 天时 Cd 的吸收和积累与可交换态 Cd 含量呈负相关，可交换态 Cd 与添加 0.4 g/kg GO（E2）后土壤中功能基团的相对含量呈负相关。人工向土壤中添加 GO 可以作为提高紫锥菊修复 Cd 土壤污染效果的有效途径，在稳定植物和植被以及修复高浓度 Cd 污染土壤方面具有很大的应用潜力。
