Han Lu, Gong Zehan, Li Jing, Chen Mengfang, Ma Jun, Wu Wenpei, Chen Xueyan, Yang Lei
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Jiangsu Engineering Laboratory for Soil and Groundwater Remediation of Contaminated Sites, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
College of Chemistry and Materials Science, Sichuan Normal University, Sichuan 610066, China.
J Hazard Mater. 2023 Oct 5;459:132325. doi: 10.1016/j.jhazmat.2023.132325. Epub 2023 Aug 16.
This study discovered that nanosized zero valent magnesium (nZVMg) could be formed during the electrochemical corrosion of microsized ZVMg (mZVMg) in aqueous solution. It is observed that the nZVMg particle sizes were less than 50 nm with the specific surface area of 54.63 m/g after it was corroded for 96 h (ZVMg) at the expense of losing about 60 wt% Mg. However, the XPS characterization indicated the thickness of Mg(OH) layer over ZVMg being less than 5 nm, accompanied by the faster electron transfer rate but slower corrosion rate than mZVMg. Most importantly, the removal efficiency of 82 % under high-level trichloroethylene (TCE) at 100 mg/L was achieved by ZVMg within one hour relative to 48 % by mZVMg. The rate constant normalized by surface area was 3.11 × 10 L/m/h by ZVMg due to the high surface energy of nanoparticles. The degradation products were dependent on the initial TCE concentrations, with environmentally friendly and biodegradable degradation products being generated via hydrodechlorination, hydrogenation and polymerization pathways according to the density functional theory calculations. ZVMg corroded for 14 days illustrated a long-term chemical stability and excellent degradation performance, demonstrating significant application potential in remediating the TCE plumes in groundwater.
