Comments on “The effect of substituent groups on the reductive degradation of azo dyes by zerovalent iron” by M. Hou, et al. [J. Hazard. Mater. 145 (2007) 305]

Noubactep, Chicgoua

doi:10.1016/j.jhazmat.2007.07.004

Cited by 8 publications

(2 citation statements)

References 13 publications

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“…A thick and compact oxide layer, which is always found on the surface of CZVI, could act as a physical barrier to inhibit the electron transfer and lead to the decrease of reactivity. 29 Then, the different oxide lm structures could be the key factor to affect the degradation rate of DB6 with different ZVI materials. Based on the study of the passive lm in corrosion science, the oxide lm or passive lm is affected by the structure and the composition of the matrix.…”

Section: Resultsmentioning

confidence: 99%

Rapid decomposition of Direct Blue 6 in neutral solution by Fe–B amorphous alloys

et al. 2015

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The development of environmental-friendly materials for the highly-efficient purification of dye-containing wastewater is important and attractive. In this work, Fe-B amorphous alloy ribbons were fabricated and employed to degrade the azo dye, Direct Blue 6. It shows that Fe-B binary amorphous alloys possess low reaction activation energy (25.43 kJ mol À1 ) and much higher degrading efficiency than their crystalline counterparts and the commercial iron powders. Under the same experimental conditions (25 C, initial pH ¼ 7), the surface area normalized reaction rate constant of Fe 84 B 16 amorphous alloy is approximately 1.8 and 89 times as that of its crystalline alloy and the 300 mesh iron powders, respectively. It indicates that the homogeneous amorphous structure is beneficial to the degradation rate of the zero valent iron. It has been found that boron plays an important role in enhancing the degradation rate because it contributes to the formation of an incompact oxide layer at the metal-water interface. Unlike the dense oxide layer formed on the surface of iron powders, this incompact layer would benefit iron atoms' movement and promote the reduction of contaminants. The present results provide a new amorphous zero valent iron material and a new way of designing proper iron-based alloys for waste-water remediation.

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Section: Resultsmentioning

confidence: 99%

Rapid decomposition of Direct Blue 6 in neutral solution by Fe–B amorphous alloys

et al. 2015

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“…The MTW concept is widely accepted in current literature despite four strong features suggesting its instability: (i) the concept is derived without demonstration/verification from the thermodynamic standpoint (low reduction potential of the redox couple Fe II /Fe 0 ), (ii) a number of publications has attempted to point out its instability for individual contaminants [17][18][19][20], (iii) the MTW concept is inadequate to explain some experimental results as will be shown later, and (iv) where the concept is believed to have been demonstrated the experimental conditions were not appropriate [21][22][23][24]. In particular, the experimental conditions of Matheson & Tratnyek [2], and Weber [1] are not sufficient to allow traceable conclusions.…”

Section: The Mtw Concept and Its Limitationsmentioning

confidence: 99%

Processes of Contaminant Removal in “Fe0-H2O” Systems Revisited: The Importance of Co-Precipitation

Noubactep¹

2008

TOENVIRSJ

Self Cite

110

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Abstract:The mechanism of aqueous contaminant removal by elemental iron (Fe 0 ) materials (e.g., in Fe 0 -H 2 O systems) has been largely discussed in the "iron technology" literature. Two major removal mechanisms are usually discussed: (i) contaminant adsorption onto Fe 0 oxidation products, and (ii) contaminant reduction by Fe 0 , Fe II or H/H 2 . However, a closer inspection of the chemistry of the Fe 0 -H 2 O system reveals that co-precipitation could be the primary removal mechanism. The plausibility of contaminant co-precipitation with iron corrosion products as independent contaminant removal mechanism is discussed here. It shows that the current concept does not take into account that the corrosion product generation is a dynamic process in the course of which contaminants are entrapped in the matrix of iron hydroxides. It is recalled that contaminant co-precipitation with iron hydroxides/oxides is an unspecific removal mechanism. Contaminant co-precipitation as primary removal mechanism is compatible with subsequent reduction and explains why redoxinsensitive species are quantitatively removed. Adsorption and co-precipitation precede reduction and abiotic reduction, when it takes place, occurs independently by a direct (electrons from Fe 0 ) or an indirect (electrons from Fe II /H 2 ) mechanism.

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Combined Fe0/air and Fenton process for the treatment of dinitrodiazophenol (DDNP) industry wastewater

Yuan

Lai

Tang

2016

Chemical Engineering Journal

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Comments on “The effect of substituent groups on the reductive degradation of azo dyes by zerovalent iron” by M. Hou, et al. [J. Hazard. Mater. 145 (2007) 305]

Cited by 8 publications

References 13 publications

Rapid decomposition of Direct Blue 6 in neutral solution by Fe–B amorphous alloys

Rapid decomposition of Direct Blue 6 in neutral solution by Fe–B amorphous alloys

Processes of Contaminant Removal in “Fe0-H2O” Systems Revisited: The Importance of Co-Precipitation

Combined Fe0/air and Fenton process for the treatment of dinitrodiazophenol (DDNP) industry wastewater

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