Reductive dechlorination of carbon tetrachloride by zero-valent iron and related iron corrosion

The suitability of metallic iron for environmental remediation

“…Since the work of Weber [10] the know-why of contaminant removal in Fe 0 /H 2 O systems was considered to be achieved and the iron/sand mixture lost his nickname of ''magic sand'' [2]. However, the acceptance of the concept of reductive transformation was primarily a consensus [4] as this concept failed to consistently explained many experimental facts [11][12][13][14]. For example, while using differential pulse polarography to investigate the reduction of nitrobenzene in Fe 0 /H 2 O systems, Lavine et al [11] concluded that their studies were very informative but they couldn't evidence reduction of organic compounds as mediated by the Fe 0 surface.…”

Metallic iron for water treatment: leaving the valley of confusion

“…Example 3 Warning of some scientists (LipczynskaKochany et al 1994;Farrell et al 2001;Lavine et al 2001;Noubactep 2006;Jiao et al 2009) about the stability of the theory that Fe 0 is an environmental reducing agent has been collectively ignored (Richardson and Nicklow 2002;Fu et al 2014;Guan et al 2015;Zou et al 2016). Moreover, the alternative theory that Fe 0 is a generator of reducing agents and iron oxides (Noubactep 2006(Noubactep , 2007(Noubactep , 2008 was equally refuted (Kang and Choi 2009;Tratnyek and Salter 2010), incompletely considered Guan et al 2015) or simply ignored (Fu et al 2014;Zou et al 2016).…”

“…In another phrase, in an Fe 0 /H 2 O system a contaminant can be adsorbed, oxidized or/and reduced depending on its affinities to available mineral phases and its chemical reactivity with other species. It is also understood that the surface of Fe minerals possesses catalytic properties for relevant reactions (Furukawa et al 2002;Richardson and Nicklow 2002;Jia et al 2007;Jiao et al 2009;Noubactep 2009a;Ghauch et al 2010;Ghauch et al 2011;Gheju and Balcu 2011;Ghauch, 2015;Gheju et al 2016). However, at concentration levels relevant for natural waters, contaminants are removed from the aqueous phase by (1) adsorption, (2) co-precipitation and (3) size-exclusion (Pokhrel and Viraraghavan 2008;Noubactep 2011b;Luo et al 2013;Ndé-Tchoupé et al 2015;Tepong-Tsindé et al 2015a;Noubactep 2016a) (Table 3).…”

Testing Metallic Iron Filtration Systems for Decentralized Water Treatment at Pilot Scale

“…As a consequence Fe 0 corrosion is an electrochemical reaction mediated by water (H2O or H + ) and resulting in H2 evolution. However, contaminant reduction, when it occurs, is not the primary coupled cathodic reaction [82,112,118,119].…”