Removal of Lead Ions from Aqueous Solution by Nano Zero-Valent Iron (nZVI)

Abstract

Background: The nanoscale zero-valent iron (nZVI) has good potential for heavy metals removal from aqueous solution because it has special physicochemical properties. In addition, it could remove Lead from aqueous solution.

Microstructure and morphological characterization of lead-contaminated clay with nanoscale zero-valent iron (nZVI) treatment

“…Considering the soil complexity, it is essential to set the concentration of the treatment reagents matching the contaminants. It is reported that the nZVI performed a higher removal efficiency when the molar ratio of nZVI/lead and nZVI/nitrate is 10 and 4 respectively in the solution (Su et al 2014, Moazeni et al 2017. The dosages of nZVI was used as 0.2%, 1%, 5% and 10% (dry density) corresponding to the molar content of nZVI is 15, 75, 370 and 740.…”

“…It can react with organic contaminants and heavy metal ions, including Pb 2+ , Ni 2+ , As 2+ , Co 2+ , Cu 2+ , CrO4 2-, AsO4 3-, polycyclic aromatic hydrocarbons (PAH) etc. in bench-scale and pilot-scale experiments (Mueller et al 2012, Singh et al 2012, Chekli et al 2016, Tiberg et al 2016, Wang et al 2016, Gil-Díaz et al 2017, Li et al 2017, Moazeni et al 2017. The nZVI efficiency of aqueous, contaminated groundwater was proved in many literatures.…”

“…The changes in clay-and sand-sized particle percentages in the stabilized soils are dominantly attributed to both short-term flocculation formation and long-term oxidation reactions (Nalbantoglu and Tuncer 2001, Tran et al 2014, Xia et al 2017. Both mechanisms of nZVI in the soil could result in a higher percentage of particle or bounded aggregations (Phenrat et al 2007, Li et al 2008, Moazeni et al 2017). He et al (2008) indicated that different particle sizes show different tendency to aggregate.…”