Reduction of nitrate to ammonia by zero-valent iron

Cheng, I. Francis; Muftikian, Rosy; Fernaǹdo, Quintus; Korte, Nic

doi:10.1016/s0045-6535(97)00275-0

Cited by 282 publications

(167 citation statements)

References 7 publications

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“…9 Similarly, ZVI was efficiently used to decompose nitrate and nitrobenzene. 10 Except for the above observation by the ZVI, further investigation on the…”

Section: Introductionmentioning

confidence: 84%

Remediation of Soil Contaminated with Pyrene Using Ground Nanoscale Zero-Valent Iron

Chang

Shu

Hsieh³

et al. 2007

Journal of the Air & Waste Management Association

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The sites contaminated with recalcitrant polycyclic aromatic hydrocarbons (PAHs) are serious environmental problems ubiquitously. Some PAHs have proven to be carcinogenic and hazardous. Therefore, the innovative PAH in situ remediation technologies have to be developed instantaneously. Recently, the nanoscale zero-valent iron (ZVI) particles have been successfully applied for dechlorination of organic pollutants in water, yet little research has investigated for the soil remediation so far. The objective in this work was to take advantage of nanoscale ZVI particles to remove PAHs in soil. The experimental factors such as reaction time, particle diameter and iron dosage and surface area were considered and optimized. From the results, both microscale and nanoscale ZVI were capable to remove the target compound. The higher removal efficiencies of nanoscale ZVI particles were obtained because the specific surface areas were about several dozens larger than that of commercially microscale ZVI particles. The optimal parameters were observed as 0.2 g iron/2 mL water in 60 min and 150 rpm by nanoscale ZVI. Additionally, the results proved that nanoscale ZVI particles are a promising technology for soil remediation and are encouraged in the near future environmental applications. Additionally, the empirical equation developed for pyrene removal efficiency provided the good explanation of reaction behavior. Ultimately, the calculated values by this equation were in a good agreement with the experimental data.

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“…9 Similarly, ZVI was efficiently used to decompose nitrate and nitrobenzene. 10 Except for the above observation by the ZVI, further investigation on the…”

Section: Introductionmentioning

confidence: 84%

Remediation of Soil Contaminated with Pyrene Using Ground Nanoscale Zero-Valent Iron

Chang

Shu

Hsieh³

et al. 2007

Journal of the Air & Waste Management Association

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“…5, 2006 Zero-valent iron has been determined to be an effective material for the removal of a variety of important organic contaminants from water. [12][13][14][15][16][17][18] The redox couple formed by zero oxidation state metallic iron (Fe 0 ) and dissolved aqueous Fe 2+ has a standard reduction potential of -0.440 V. 19 This makes Fe 0 a reducing agent for many redox-labile substances, including hydrogen ions, carbonate, sulfate, nitrate, and oxygen. Azo dyes can also be reduced by iron, the reduction of the chromophoric group (-N=N-bond) by zero valent iron being thermodynamically favorable.…”

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confidence: 99%

Azo dye degradation by recycled waste zero-valent iron powder

Pereira¹,

Freire²

2006

J. Braz. Chem. Soc.

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Neste trabalho é apresentado um método eficiente para a degradação de corantes, usando uma fonte de pó de ferro zero ambientalmente amigável (resíduo de um processo industrial). A influência de vários fatores experimentais (tais como: pH, massa de ferro, tamanho de partícula, concentração do substrato, atmosfera inerte ou oxidante) sobre a eficiência do ferro zero em reduzir o grupo cromóforo e o teor de carbono orgânico total de um azocorante (Preto Remazol B) foi avaliada. O processo de degradação do corante apresentou uma cinética de primeira ordem com uma constante de 0,153 min -1 . Nas condições otimizadas (pH=3, [Fe] = 5 g L -1 , tamanho de partícula ≤ 250 μm), este processo promoveu uma descoloração de 95% e redução de 70% na concentração de carbono orgânico total de uma solução 100 mg L -1 do corante. Este processo também foi empregado na degradação de um efluente industrial têxtil apresentando bons resultados e demonstrando capacidade para ser uma alternativa para a remediação de sistemas aquáticos poluídos.In this paper an efficient method for azo dye degradation using an environmentally friendly zero-valent iron powder source is presented (iron particles discarded from a manufacturing process). The influence of several experimental parameters (such as pH, iron mass, particle size, substrate concentration, oxidizing and inert atmospheres) on the ability of zero-valent iron to reduce the chromophoric groups and total organic carbon content of the azo dye Remazol Black B was evaluated. Kinetic studies revealed that the azo degradation by Fe 0 appeared to be first-order with respect to substrate, with an observed rate constant (k obs ) of 0.153 min -1 . Under the optimized operational conditions (pH 3, [Fe] = 5 g L -1 , iron particle size ≤ 250 μm), the iron-based process produced net a reduction in color and total organic carbon of about 95% and 70%, respectively. The process was also evaluated for the degradation of textile effluent. The studied process showed good characteristics, which can make it an effective alternative for polluted aquatic system remediation.Keywords: reductive degradation process, dye degradation, effluent treatment, Fenton´s reagent IntroductionOver the last decades, the increasing demand for dyes by the textile industry has shown a high pollutant potential. It is estimated that around 10 -15% of the dyes are lost in the effluent during the dyeing processes. 1,2 The discharge of highly colored synthetic dye effluents can be very damaging to the receiving water bodies, since these dyes in the water strongly absorb sunlight, which decreases the intensity of light absorbed by water plants and phytoplankton, reducing photosynthesis and the oxygenation of water reservoirs. 3 Also, public perception of water quality is greatly influenced by its color. The presence of unnatural colors is esthetically unpleasant and tends to be associated with contamination. 4 In addition, dyes used in the textile industry may be toxic to aquatic organisms and can be resistant to natural biological deg...

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“…By contrast, in the alkaline medium, the surface passivation of Fe 0 particles occurred and iron corrosion ceased at above pH 8.8. [21] Also, in this case, the hydrogen atom demanded by the reaction of hydrodechlorination was extracted from the H 2 O molecule, and such extraction needed a higher energy penalty than from the acid.…”

Section: Effect Of Phmentioning

confidence: 99%

Effects of key reaction parameters on the reductive dechlorination of chloroform with Pd/Fe⁰bimetal in aqueous solution

Xuan

Wang

et al. 2010

Journal of Environmental Science and Health, Part A

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Reduction of nitrate to ammonia by zero-valent iron

Cited by 282 publications

References 7 publications

Remediation of Soil Contaminated with Pyrene Using Ground Nanoscale Zero-Valent Iron

Remediation of Soil Contaminated with Pyrene Using Ground Nanoscale Zero-Valent Iron

Azo dye degradation by recycled waste zero-valent iron powder

Effects of key reaction parameters on the reductive dechlorination of chloroform with Pd/Fe⁰bimetal in aqueous solution

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Reduction of nitrate to ammonia by zero-valent iron

Cited by 282 publications

References 7 publications

Remediation of Soil Contaminated with Pyrene Using Ground Nanoscale Zero-Valent Iron

Remediation of Soil Contaminated with Pyrene Using Ground Nanoscale Zero-Valent Iron

Azo dye degradation by recycled waste zero-valent iron powder

Effects of key reaction parameters on the reductive dechlorination of chloroform with Pd/Fe0bimetal in aqueous solution

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Effects of key reaction parameters on the reductive dechlorination of chloroform with Pd/Fe⁰bimetal in aqueous solution