Sustaining reactivity of Fe0 for nitrate reduction via electron transfer between dissolved Fe2+ and surface iron oxides

Han, Lei; Yang, Li; Wang, Haibo; Hu, Xuexiang; Chen, Zhan; Hu, Chun

doi:10.1016/j.jhazmat.2016.01.047

Cited by 49 publications

(15 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reduction of target molecule can produce more surface Fe oxides generating more active sites for the Fe 2+ and consequently increase the reaction rate [66,67]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Electrochemically-based hybrid oxidative technologies for the treatment of micropollutants in drinking water

Souza

Zougagh

Sáez

et al. 2021

Chemical Engineering Journal

View full text Add to dashboard Cite

“…The reduction of target molecule can produce more surface Fe oxides generating more active sites for the Fe 2+ and consequently increase the reaction rate [66,67]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Electrochemically-based hybrid oxidative technologies for the treatment of micropollutants in drinking water

Souza

Zougagh

Sáez

et al. 2021

Chemical Engineering Journal

View full text Add to dashboard Cite

“…A simple first-order kinetic model was used for nitrate reduction. The equations used in this study are as follows: 9,13,32,33…”

Section: Methodsmentioning

confidence: 99%

Selective Reduction of Nitrate into Nitrogen Using Cu/Fe Bimetal Combined with Sodium Sulfite

Liu

Gong

Yang

et al. 2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

A novel two-step reduction process was constructed to removal nitrate selectively in aqueous solution. Nitrate was preliminarily reduced into nitrite with low yield of ammonia by microscale Cu/Fe bimetal, and then the accumulated nitrite was converted into N2 by sodium sulfite. Cu was uniformly dispersed on the surface of Fe by a simple displacement reaction. Role of major iron components and fate of nitrogen species were investigated. The selectivity for N2 was over 90%, and the yield of ammonia was below 10%. In the system, accumulation of nitrite resulted from the lower reduction rate of nitrite by Fe2+ in solution and the Cu/Fe coated by oxidized iron layer compared with the generation rate of nitrite via the reduction of nitrate. The generation of ammonia was caused by the reduction of nitrate/nitrite by Fe2+ adsorbed on the surface of oxidized iron layer coated on the bimetal at low reaction rate.

show abstract

“…As it was reported that shell-bounded Fe 2+ on different iron oxides is a strong reductant with specific redox properties (Johnson et al 1998;Amonette et al 2000;Elsner et al 2004;Silvester et al 2005;Shao and Butler 2007;Bae and Hanna 2015;Gorski et al 2016;Stewart et al 2018), reduction can occur before the pollutant comes into contact with the surface. The spontaneous electron transfer between Fe 2+ and Fe(III) oxides on the shell, which is influenced by the stoichiometry between Fe 2+ and Fe 3+ and the presence of surface defect (Gorski and Scherer 2009;Gorski et al 2010;Notini et al 2018;Usman et al 2018), results in an acceleration in the interfacial electron transfer between iron species and the pollutant (Huang and Zhang 2005;Han et al 2016b). In addition, the presence of defects in the shell was assumed to act as a catalyst for hydrodechlorination (dechlorination by hydrogen) (Liu et al 2005a), due to the local separation of anodic and cathodic sites on the particles (Odziemkowski et al 1998;Odziemkowski and Simpraga 2004).…”

Section: History Reactivity and Characterizationmentioning

confidence: 99%

In Situ Chemical Reduction of Chlorinated Organic Compounds

Rodrigues

Betelu

Colombano

et al. 2020

Applied Environmental Science and Engineering for a Sustainable Future

View full text Add to dashboard Cite

Chlorinated organic compounds (COCs) are common anthropogenic contaminants of soil and groundwater. COCs were industrially produced for different applications, such as dry cleaning, degreasing, or as pesticides. The presence of COCs in the environment is a major concern because of their toxicity and persistence.The most widely used method for their remediation is the conventional pump-and-treat system. However, this technology can hardly achieve a complete remediation because of geological characteristics and the presence of pore space pollution/adsorbed pollution, leading to a residual saturation. Hence, in addition to the improvement of pump-and-treat systems, in situ chemical processes have been largely developed. These chemical processes involve the injection of chemical reagents for the removal of residual source pollution and/or the treatment of plume contamination. Chemical degradation of COCs can be achieved by oxidative or reductive processes. If chemical oxidation has been first developed for in situ application, chemical reduction is one of the most important emerging remediation techniques for COCs treatment. Due to the electronegative character of chlorine substituents, COCs can effectively be transformed via reductive pathways. Moreover, reductive dechlorination has shown higher efficiency on highly chlorinated compounds. This chapter focuses on the presentation of the chemical reduction of the most common COCs pollutants, followed by kinetic and mechanistic approaches related to the use of iron-based particles. Developments on in situ chemical reduction technologies in order to enhance remediation rates are also exposed. Influence of environmental conditions for in situ applications is then developed. Finally, a case study is presented.

show abstract

Sustaining reactivity of Fe0 for nitrate reduction via electron transfer between dissolved Fe2+ and surface iron oxides

Cited by 49 publications

References 49 publications

Electrochemically-based hybrid oxidative technologies for the treatment of micropollutants in drinking water

Electrochemically-based hybrid oxidative technologies for the treatment of micropollutants in drinking water

Selective Reduction of Nitrate into Nitrogen Using Cu/Fe Bimetal Combined with Sodium Sulfite

In Situ Chemical Reduction of Chlorinated Organic Compounds

Contact Info

Product

Resources

About