利用纳米 SiO2 和纳米 CeO2 提高观赏植物景天Sedum spectabile 对多环芳烃的吸收。
Improving the uptake of PAHs by the ornamental plant Sedum spectabile using nano-SiO and nano-CeO.
机构信息
Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
出版信息
Sci Total Environ. 2023 Apr 20;870:161808. doi: 10.1016/j.scitotenv.2023.161808. Epub 2023 Jan 24.
Polycyclic aromatic hydrocarbons (PAHs) pollution is a global ecological soil problem. Screening and establishing an efficient phytoremediation system would be beneficial for alleviating this problem. The ornamental plant Sedum spectabile was selected as the remediation plant to study the removal efficiencies of PAHs after adding different concentrations of nano-SiO, nano-CeO, and traditional Na-montmorillonite (Na-MMT). The results demonstrated that shoot biomass was increased and photosynthesis was enhanced by the nanomaterial amendments. The uptake of 16 PAHs by S. spectabile was remarkably increased. Moreover, the two highest shoot concentrations were 7.61 (Phe) and 12.03 (Flo) times that of the control, and the two highest translocation factors were 31 (BbF) and 28 (BaP) times that of the control. Furthermore, 16S rRNA gene sequencing showed that the addition of nano-SiO increased the abundance of Acidobacteria, and the genera related to PAH degradation was higher under nanomaterial treatments. The very high Si concentration in the shoots of S. spectabile had a significant linear correlation with the concentration of PAHs. In conclusion, the S. spectabile remediation system assisted by two nanomaterials was effective for the removal of PAHs from soil, and the transfer of PAHs to easily harvested aboveground plant parts was especially worthy of attention.
多环芳烃（PAHs）污染是一个全球性的生态土壤问题。筛选和建立有效的植物修复系统将有助于缓解这一问题。选择观赏植物景天（Sedum spectabile）作为修复植物，研究添加不同浓度的纳米二氧化硅、纳米氧化铈和传统钠基蒙脱石（Na-MMT）后对 PAHs 的去除效率。结果表明，纳米材料的添加增加了地上部分生物量和光合作用。S. spectabile 对 16 种 PAHs 的吸收显著增加。此外，两种最高的地上部分浓度分别是对照的 7.61 倍（Phe）和 12.03 倍（Flo），两种最高的转运因子分别是对照的 31 倍（BbF）和 28 倍（BaP）。此外，16S rRNA 基因测序表明，添加纳米 SiO 增加了酸杆菌的丰度，纳米材料处理下与 PAH 降解相关的属更高。S. spectabile 地上部分的高硅浓度与 PAHs 的浓度呈显著线性相关。总之，两种纳米材料辅助的 S. spectabile 修复系统能有效去除土壤中的 PAHs，且 PAHs 向易于收获的地上植物部分的转移尤其值得关注。
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