Promoting aqueous and transport characteristics of highly reactive nanoscale zero valent iron via different layered hydroxide coatings
Applied Surface Science, ISSN: 0169-4332, Vol: 506, Page: 145018
2020
- 75Citations
- 30Captures
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Article Description
In this study, nanoscale zero valent iron (Fe 0 ) was coated with different layered hydroxide coatings (Mg/Al/Ca(OH) N ) to enhance its suspension stability in aqueous solution and transportability within the porous media. Morphological characteristics, crystallinity and surface elemental composition of the synthesized bare (Fe 0 ) and coated (C-Fe 0 ) were investigated using TEM, XRD and SEM-EDS analyses respectively. Suspension stability of Fe 0 and C-Fe 0 suspensions with different [Mg or Al or Ca/Fe: 0.2–1.0 wt/wt] coating ratios was investigated through several sets of 180 min settlement experiments. Moreover, packed-column experiments were conducted to evaluate the mobility of the prepared materials through porous media. Settlement results were highly consistent with mobility investigation, where C-Fe 0 [Mg/Fe] 1.0 showed the best performance in both with around 88% relative suspension efficiency and 93% penetration efficiency (5 times higher than Fe 0 ). A reciprocal relation was found between particle size, crystallinity and reactivity of the C-Fe 0, where the finest sizes exhibited higher crystallinity and better removal of the two targeted nutrients. Furthermore, the progressive dissolution of the Mg(OH) 2 shell compared with the other coating materials resulted in its superior prolonged reactivity. The presented C-Fe 0 could be promising towards enhanced performance of the reactive nanoparticles in the real water treatment applications.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0169433219338358; http://dx.doi.org/10.1016/j.apsusc.2019.145018; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85076381155&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0169433219338358; https://dx.doi.org/10.1016/j.apsusc.2019.145018
Elsevier BV
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