Removal of lead from soil leachate leached with HCl by nanoscale zero valent iron particles
纳米零价铁颗粒去除污染土壤HCl浸提液中的Pb

Nanoscale zero-valent iron(NZVI) was investigated for the removal of lead from soil leaching solutions,which were obtained by leaching a contaminated soil with HCl.Batch experiments were conducted to study the influence of concentration of HCl,NZVI dosage and sorption time on the lead removal efficiency.The results showed that the lead sorption process followed Langmuir and Freundlich models and followed the pseudo-first-order kinetic expression,and the surface-area-normalized rate coefficient KSA was 0.018 mL/(m2·min).Removal rate was over 90% in 30 min for 51.7 mg/L lead(leached by 1.0 mol/L HCl) by 0.5 g NZVI.The results of this study suggest that NZVI is a suitable sorbent for lead in soil leaching solutions,but the efficiency is much lower than the removal of Pb in aqueous solutions.