Sustaining the efficiency of the Fe(0)/H2O system for Cr(VI) removal by MnO2 amendment

Gheju, Marius; Balcu, Ionel

doi:10.1016/j.chemosphere.2018.09.129

Cited by 38 publications

(49 citation statements)

References 90 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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.Sustainability 2019, 11, 671 2 of 20 organic [27,28], fluoride [29][30][31], heavy metals [32,33], nitrate [34,35], pathogens [36][37][38] and radionuclides [32,39]. The desalination of water using Fe 0 has also been reported [40][41][42][43].…”

mentioning

confidence: 99%

“…The two key advantages of Fe 0 are its affordability and its universal availability (iron nails, scrap iron and steel wool) [9,10,44,45]. It is commonly reported that the major drawback of Fe 0 -based technologies for water treatment is the low intrinsic reactivity of granular materials [28,33,46]. This situation is said to be aggravated by the inherent generation of an oxide scale at the Fe 0 surface (passivation).…”

mentioning

confidence: 99%

“…The EDTA method was already used to demonstrate the impact of selected operational conditions on the investigations of processes occurring in Fe 0 /H 2 O systems. In particular, it was demonstrated that quiescent batch experiments are the best conditions to investigate diffusion-controlled processes occurring within the dynamic oxide scale [33,60,61].Sustainability 2019, 11, 671 3 of 20…”

mentioning

confidence: 99%

See 2 more Smart Citations

The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water Treatment

Ndé-Tchoupé

Lufingo

et al. 2019

Sustainability

View full text Add to dashboard Cite

Studies were undertaken to determine the reasons why published information regarding the efficiency of metallic iron (Fe 0 ) for water treatment is conflicting and even confusing. The reactivity of eight Fe 0 materials was characterized by Fe dissolution in a dilute solution of ethylenediaminetetraacetate (Na 2 -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 0 type (granular iron, iron nails and steel wool) and pretreatment procedure (socking in acetone, EDTA, H 2 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.Sustainability 2019, 11, 671 2 of 20 organic [27,28], fluoride [29][30][31], heavy metals [32,33], nitrate [34,35], pathogens [36][37][38] and radionuclides [32,39]. The desalination of water using Fe 0 has also been reported [40][41][42][43]. The two key advantages of Fe 0 are its affordability and its universal availability (iron nails, scrap iron and steel wool) [9,10,44,45]. It is commonly reported that the major drawback of Fe 0 -based technologies for water treatment is the low intrinsic reactivity of granular materials [28,33,46]. This situation is said to be aggravated by the inherent generation of an oxide scale at the Fe 0 surface (passivation). Countermeasures to overcome Fe 0 passivation were recently reviewed by Guan et al. [28] and further discussed by Noubactep [47]. It is recalled that, considering passivation as a "curse" contradicts the evidence that Fe 0 -based subsurface permeable barriers have been successfully working for more than one decade [48][49][50]. On the other hand, increased "passivation" should have occurred in the spongy iron filters in Antwerpen as well [2,19]. Clarifying this contradiction is certainly a progress for the whole Fe 0 technology. Clearly, an understanding of the role of "passivation" in the process of decontamination using Fe 0 should be useful for enhancing the system's efficiency in practice [30,31,47].There is an agreement on the evidence that using Fe 0 for water treatment and environmental remediation is "putting corrosion to use" [51][52][53]. There is otherwise a contradiction on practically any other aspect concerning the Fe 0 /H 2 O system, including the reaction mechanisms and factors determining the long-term efficiency of such systems [9,28,47,[54][55][56][57][58]. A key reason for this is the large variability of experimental conditions used in testing Fe 0 materials [58][59][60][61][62]. The main influencing operational parameter seems to be Fe 0 itself [58,61,63,6...

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water Treatment

Ndé-Tchoupé

Lufingo

et al. 2019

Sustainability

View full text Add to dashboard Cite

show abstract

“…The oxide scale collects dissolved species which can then be reduced by Fe II species and H 2 (Equation (1)). It is thus not surprising that species are reduced in Fe 0 /H 2 O systems [3][4][5][6]21]. This is a pure chemical reaction between contaminants and primary iron corrosion products (Fe II , H 2 ).…”

mentioning

confidence: 99%

“…This objective will not be achieved until the initial mistake has been acknowledged and corrected. It suffices to properly consider the work of Khudenko [13], a science-based concept that has been independently demonstrated by some researchers [3,21,24,25]. Admittedly, some efficient Fe 0 -based remediation systems exist, some even before the 1990s, but they were almost all designed using a pragmatic approach.…”

mentioning

confidence: 99%

Iron Corrosion: Scientific Heritage in Jeopardy

Noubactep

2018

Sustainability

View full text Add to dashboard Cite

Research on the use of metallic iron (Fe 0 ) for environmental remediation and water treatment has taken off during the past three decades. The results achieved have established filtration on Fe 0 packed beds as an efficient technology for water remediation at several scales. However, the further development of Fe 0 -based filtration systems is impaired by the non-professional behavior of scientists who ignore available advances in knowledge. The confusion is overcome when due consideration is given to the fact that revealing state-of-the-art knowledge is a prerequisite to presenting individual achievements.

show abstract

MnO₂‐Based Materials for Environmental Applications

et al. 2021

View full text Add to dashboard Cite

Manganese dioxide (MnO2) is a promising photo–thermo–electric‐responsive semiconductor material for environmental applications, owing to its various favorable properties. However, the unsatisfactory environmental purification efficiency of this material has limited its further applications. Fortunately, in the last few years, significant efforts have been undertaken for improving the environmental purification efficiency of this material and understanding its underlying mechanism. Here, the aim is to summarize the recent experimental and computational research progress in the modification of MnO2 single species by morphology control, structure construction, facet engineering, and element doping. Moreover, the design and fabrication of MnO2‐based composites via the construction of homojunctions and MnO2/semiconductor/conductor binary/ternary heterojunctions is discussed. Their applications in environmental purification systems, either as an adsorbent material for removing heavy metals, dyes, and microwave (MW) pollution, or as a thermal catalyst, photocatalyst, and electrocatalyst for the degradation of pollutants (water and gas, organic and inorganic) are also highlighted. Finally, the research gaps are summarized and a perspective on the challenges and the direction of future research in nanostructured MnO2‐based materials in the field of environmental applications is presented. Therefore, basic guidance for rational design and fabrication of high‐efficiency MnO2‐based materials for comprehensive environmental applications is provided.

show abstract

Sustaining the efficiency of the Fe(0)/H2O system for Cr(VI) removal by MnO2 amendment

Cited by 38 publications

References 90 publications

The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water Treatment

The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water Treatment

Iron Corrosion: Scientific Heritage in Jeopardy

MnO₂‐Based Materials for Environmental Applications

Contact Info

Product

Resources

About

Sustaining the efficiency of the Fe(0)/H2O system for Cr(VI) removal by MnO2 amendment

Cited by 38 publications

References 90 publications

The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water Treatment

The Impact of Selected Pretreatment Procedures on Iron Dissolution from Metallic Iron Specimens Used in Water Treatment

Iron Corrosion: Scientific Heritage in Jeopardy

MnO2‐Based Materials for Environmental Applications

Contact Info

Product

Resources

About

MnO₂‐Based Materials for Environmental Applications