Improving the uptake of PAHs by the ornamental plant Sedum spectabile using nano-SiO2 and nano-CeO2

Jianv Liu; Yaping Wang; Mingzhu Wang; Xiaoting Feng; Rongrong Liu; Zijin Xue; Qixing Zhou

doi:10.1016/j.scitotenv.2023.161808

Improving the uptake of PAHs by the ornamental plant Sedum spectabile using nano-SiO₂ and nano-CeO₂

Sci Total Environ. 2023 Apr 20:870:161808. doi: 10.1016/j.scitotenv.2023.161808. Epub 2023 Jan 24.

Authors

Jianv Liu¹, Yaping Wang¹, Mingzhu Wang¹, Xiaoting Feng¹, Rongrong Liu¹, Zijin Xue¹, Qixing Zhou²

Affiliations

¹ Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
² Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China. Electronic address: zhouqx@nankai.edu.cn.

PMID: 36706996
DOI: 10.1016/j.scitotenv.2023.161808

Abstract

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-SiO₂, nano-CeO₂, 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-SiO₂ 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.

Keywords: Bioremediation; Nanomaterials; Ornamental plant; Petroleum hydrocarbon pollution; Soil.

MeSH terms

Biodegradation, Environmental
Plants / metabolism
Polycyclic Aromatic Hydrocarbons* / analysis
RNA, Ribosomal, 16S
Sedum* / metabolism
Silicon Dioxide
Soil
Soil Microbiology
Soil Pollutants* / analysis

Substances

Polycyclic Aromatic Hydrocarbons
Soil Pollutants
RNA, Ribosomal, 16S
Soil
Silicon Dioxide