title: Feasibility of Pb phytoextraction using nano-materials assisted ryegrass: Results of a one-year field-scale experiment.
abstract: The effect of the combined application of nano-hydroxyapatite (NHAP) or nano-carbon black (NCB) on the phytoextraction of Pb by ryegrass was investigated as an enhanced remediation technique for soils by field-scale experiment. After the addition of 0.2% NHAP or NCB to the soil, temporal variation of the uptake of Pb in aboveground parts and roots were observed. Ryegrass shoot concentrations of Pb were lower with nano-materials application than without nano-materials for the first month. However, the shoot concentrations of Pb were significantly increased with nano-materials application, in particular NHAP groups. The ryegrass root concentrations of Pb were lower with nano-materials application for the first month. These results indicated that nano-materials had significant effects on stabilization of lead, especially at the beginning of the experiment. Along with the experimental proceeding, phytotoxicity was alleviated after the incorporation of nano-materials. The ryegrass biomass was significantly higher with nano-materials application. Consequently, the Pb phytoextraction potential of ryegrass significantly increased with nano-materials application compared to the gounps without nano-materials application. The total removal rates of soil Pb were higher after combined application of NHAP than NCB. NHAP is more suitable than NCB for in-situ remediation of Pb-contaminated soils. The ryegrass translocation factor exhibited a marked increase with time. It was thought that the major role of NHP and NBA might be to alleviate the Pb phytotoxicity and increase biomass of plants.
authors.affiliation: College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, PR China. Electronic address: liangsx168@126.com.
authors.forename: Shu-Xuan
authors.initials: SX
authors.lastname: Liang
authors.affiliation: College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, PR China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Jin
authors.affiliation: College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.affiliation: Department of Preventive Medicine and Health Management, Hebei University, Baoding, 071000, PR China.
authors.forename: Xiliang
authors.initials: X
authors.lastname: Li
authors.affiliation: College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, PR China.
authors.forename: Shi-Gang
authors.initials: SG
authors.lastname: Shen
authors.affiliation: College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, PR China.
authors.forename: Ling
authors.initials: L
authors.lastname: Ding
mesh_terms: D001673:Biodegradation, Environmental; D018533:Biomass; D002244:Carbon; D002681:China; D017886:Durapatite; D007854:Lead / Q000302:isolation & purification* / Q000493:pharmacokinetics; D008129:Lolium / Q000378:metabolism*; D049329:Nanostructures; D018517:Plant Roots / Q000378:metabolism; D018520:Plant Shoots / Q000378:metabolism; D058441:Rhizosphere; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000302:isolation & purification* / Q000493:pharmacokinetics; D014018:Tissue Distribution
chemical_list: D012987:Soil; D012989:Soil Pollutants; D007854:Lead; D002244:Carbon; D017886:Durapatite
keywords: Enhanced phytoremediation; Lead; Nano-hydroxyapatite; Ryegrass