Mitigation of contamination in effluents by metallic iron: The role of iron corrosion products

被引：26

作者：

Gatcha-Bandjun, Nadege ^{[1
]}

Noubactep, Chicgoua ^{[2
,3
,4
]}

Loura, Benoit Benguellah ^{[5
]}

机构：

[1] Univ Maroua, Dept Chem, Fac Sci, BP 46, Maroua, Cameroon

[2] Univ Gottingen, Angew Geol, Goldschmidtstr 3, Gottingen, Germany

[3] Kultur & Nachhaltige Entwicklung CDD eV, Postfach 1502, D-37005 Gottingen, Germany

[4] Com Afroeuropeen, Ave Leopold 2, B-5000 Namur 41, Belgium

[5] Univ Maroua, Dept Text Engn & Leather, Higher Inst Sahel, BP 46, Maroua, Cameroon

来源：

ENVIRONMENTAL TECHNOLOGY & INNOVATION | 2017年 / 8卷

关键词：

Corrosion products; Dye discoloration; Frugal innovation; Pre-corrosion time; Water treatment; Zero-valent iron; ZERO-VALENT IRON; PERMEABLE REACTIVE BARRIERS; ION-SELECTIVE NATURE; METHYLENE-BLUE; GRANULAR IRON; FE-0/H2O SYSTEMS; AQUEOUS-SOLUTION; ARSENIC REMOVAL; WATER FILTERS; LOW-COST;

D O I：

10.1016/j.eti.2017.05.002

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

The influence of iron corrosion products (FeCPs) on the efficiency of metallic iron (Fe-0) for aqueous contaminant removal is characterized. Quiescent batch experiments were conducted for four weeks with solutions containing about 30 mu M of either methylene blue (MB) or methyl orange (MO) at room temperature. Before dye (MB or MO) addition, used Fe-0 (iron filings) was allowed to equilibrate with demineralized water for 0 to 45 days (pre-corrosion). This operation enabled the in-situ generation of various amounts FeCPs. Results clearly demonstrated the crucial importance of freshly precipitated FeCPs for the decontamination process. The differential behavior of MB and MO confirmed the ion-selective nature of Fe-0/H2O systems. A significant pH increase was observed in the MO system relative to the MB system. This was attributed to increased iron corrosion by virtue of formation of soluble Fe2+-MO complexes. The overall result questions the usefulness of pre-treating (e.g. acid washing) Fe-0 materials before testing in short term experiments and reiterates the importance of longer lasting experiments with Fe-0 materials. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：71 / 83

页数：13

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