Role of pre-corrosion of Fe-0 on its efficiency in remediation systems: An electrochemical study

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F18%3A00506535" target="_blank" >RIV/61388955:_____/18:00506535 - isvavai.cz</a>

Výsledek na webu

<a href="http://hdl.handle.net/11104/0297763" target="_blank" >http://hdl.handle.net/11104/0297763</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.chemosphere.2018.06.080" target="_blank" >10.1016/j.chemosphere.2018.06.080</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Role of pre-corrosion of Fe-0 on its efficiency in remediation systems: An electrochemical study

Popis výsledku v původním jazyce

The duration of in-situ generation of iron corrosion products (FeCPs) prior the remediation process (so called ´´aging´´ of metallic iron (Fe-0)), was found as the key parameter affecting the efficiency of Fe-0 for water remediation. Batch experiments were performed in buffered solutions (pH 4.0, 4.7 and 5.5) and under oxic conditions (presence of dissolved oxygen) using Zn2+ as probe contaminant. The time-dependent (0-16 d) concentration changes of aqueous Fe2+ and Zn2+ were monitored using differential pulse polarography (DPP). During the time of pre-corrosion varying from 0 to 6 d, an ´´induction period´´ of the corrosion occurs in the first one 2 h when no Fe2+ ion is released in the solution. After this period, Fe2+ was identified in solution and its concentration progressively increases up to 6 h, then starts to decrease and after 6 d nearly disappears. Experiments with Zn2+ reveal that the most efficient Fe-0 remediation occurs after 6 h of pre-corrosion. This coherence thus proves that the presence, the amount and the age of FeCPs (´´degree´´ of corrosion) significantly impact the removal efficiency of Zn2+ in Fe-0/H2O systems. The present study severely refute the wording 'reactivity loss' and states that progress in designing sustainable Fe-0/H2O systems will not be achieved before the role of ´´active´´ FeCPs is clarified.

Název v anglickém jazyce

Role of pre-corrosion of Fe-0 on its efficiency in remediation systems: An electrochemical study

Popis výsledku anglicky

The duration of in-situ generation of iron corrosion products (FeCPs) prior the remediation process (so called ´´aging´´ of metallic iron (Fe-0)), was found as the key parameter affecting the efficiency of Fe-0 for water remediation. Batch experiments were performed in buffered solutions (pH 4.0, 4.7 and 5.5) and under oxic conditions (presence of dissolved oxygen) using Zn2+ as probe contaminant. The time-dependent (0-16 d) concentration changes of aqueous Fe2+ and Zn2+ were monitored using differential pulse polarography (DPP). During the time of pre-corrosion varying from 0 to 6 d, an ´´induction period´´ of the corrosion occurs in the first one 2 h when no Fe2+ ion is released in the solution. After this period, Fe2+ was identified in solution and its concentration progressively increases up to 6 h, then starts to decrease and after 6 d nearly disappears. Experiments with Zn2+ reveal that the most efficient Fe-0 remediation occurs after 6 h of pre-corrosion. This coherence thus proves that the presence, the amount and the age of FeCPs (´´degree´´ of corrosion) significantly impact the removal efficiency of Zn2+ in Fe-0/H2O systems. The present study severely refute the wording 'reactivity loss' and states that progress in designing sustainable Fe-0/H2O systems will not be achieved before the role of ´´active´´ FeCPs is clarified.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Chemosphere

ISSN

0045-6535

e-ISSN

—

Svazek periodika

209

Číslo periodika v rámci svazku

OCT 2018

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

6

Strana od-do

617-622

Kód UT WoS článku

000442714400067

EID výsledku v databázi Scopus

2-s2.0-85049355072