The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water Treatment
Studies were undertaken to determine the reasons why published information regarding the efficiency of metallic iron (Fe<sup>0</sup>) for water treatment is conflicting and even confusing. The reactivity of eight Fe<sup>0</sup> materials was characterized by Fe dissolution in...
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doaj-fa49aaf17e274e5eab53b39784c33c772020-11-25T00:30:03ZengMDPI AGSustainability2071-10502019-01-0111367110.3390/su11030671su11030671The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water TreatmentRui Hu0Arnaud Igor Ndé-Tchoupé1Mesia Lufingo2Minhui Xiao3Achille Nassi4Chicgoua Noubactep5Karoli N. Njau6School of Earth Science and Engineering, Hohai University, Fo Cheng Xi Road 8, Nanjing 211100, ChinaDepartment of Chemistry, Faculty of Sciences, University of Douala, B.P. 24157 Douala, CameroonDepartment of Water and Environmental Science and Engineering, Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, TanzaniaSchool of Earth Science and Engineering, Hohai University, Fo Cheng Xi Road 8, Nanjing 211100, ChinaDepartment of Chemistry, Faculty of Sciences, University of Douala, B.P. 24157 Douala, CameroonDepartment of Applied Geology, Universität Göttingen, Goldschmidtstraße 3, D-37077 Göttingen, GermanyDepartment of Water and Environmental Science and Engineering, Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, TanzaniaStudies were undertaken to determine the reasons why published information regarding the efficiency of metallic iron (Fe<sup>0</sup>) for water treatment is conflicting and even confusing. The reactivity of eight Fe<sup>0</sup> materials was characterized by Fe dissolution in a dilute solution of ethylenediaminetetraacetate (Na<sub>2</sub>⁻EDTA; 2 mM). Both batch (4 days) and column (100 days) experiments were used. A total of 30 different systems were characterized for the extent of Fe release in EDTA. The effects of Fe<sup>0</sup> type (granular iron, iron nails and steel wool) and pretreatment procedure (socking in acetone, EDTA, H<sub>2</sub>O, HCl and NaCl for 17 h) were assessed. The results roughly show an increased iron dissolution with increasing reactive sites (decreasing particle size: wool > filings > nails), but there were large differences between materials from the same group. The main output of this work is that available results are hardly comparable as they were achieved under very different experimental conditions. A conceptual framework is presented for future research directed towards a more processed understanding.https://www.mdpi.com/2071-1050/11/3/671contaminant removalelectrochemical reactionoperational parameterszerovalent iron |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Rui Hu Arnaud Igor Ndé-Tchoupé Mesia Lufingo Minhui Xiao Achille Nassi Chicgoua Noubactep Karoli N. Njau |
spellingShingle |
Rui Hu Arnaud Igor Ndé-Tchoupé Mesia Lufingo Minhui Xiao Achille Nassi Chicgoua Noubactep Karoli N. Njau The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water Treatment Sustainability contaminant removal electrochemical reaction operational parameters zerovalent iron |
author_facet |
Rui Hu Arnaud Igor Ndé-Tchoupé Mesia Lufingo Minhui Xiao Achille Nassi Chicgoua Noubactep Karoli N. Njau |
author_sort |
Rui Hu |
title |
The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water Treatment |
title_short |
The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water Treatment |
title_full |
The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water Treatment |
title_fullStr |
The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water Treatment |
title_full_unstemmed |
The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water Treatment |
title_sort |
impact of selected pretreatment procedures on iron dissolution from metallic iron specimens used in water treatment |
publisher |
MDPI AG |
series |
Sustainability |
issn |
2071-1050 |
publishDate |
2019-01-01 |
description |
Studies were undertaken to determine the reasons why published information regarding the efficiency of metallic iron (Fe<sup>0</sup>) for water treatment is conflicting and even confusing. The reactivity of eight Fe<sup>0</sup> materials was characterized by Fe dissolution in a dilute solution of ethylenediaminetetraacetate (Na<sub>2</sub>⁻EDTA; 2 mM). Both batch (4 days) and column (100 days) experiments were used. A total of 30 different systems were characterized for the extent of Fe release in EDTA. The effects of Fe<sup>0</sup> type (granular iron, iron nails and steel wool) and pretreatment procedure (socking in acetone, EDTA, H<sub>2</sub>O, HCl and NaCl for 17 h) were assessed. The results roughly show an increased iron dissolution with increasing reactive sites (decreasing particle size: wool > filings > nails), but there were large differences between materials from the same group. The main output of this work is that available results are hardly comparable as they were achieved under very different experimental conditions. A conceptual framework is presented for future research directed towards a more processed understanding. |
topic |
contaminant removal electrochemical reaction operational parameters zerovalent iron |
url |
https://www.mdpi.com/2071-1050/11/3/671 |
work_keys_str_mv |
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