Arsenic(III) and Arsenic(V) Reactions with Zerovalent Iron Corrosion Products

2002 ◽  
Vol 36 (24) ◽  
pp. 5455-5461 ◽  
Author(s):  
Bruce A. Manning ◽  
Mathew L. Hunt ◽  
Christopher Amrhein ◽  
Jory A. Yarmoff
Keyword(s):  
Corrosion Products ◽  
Zerovalent Iron ◽  
Iron Corrosion

Removal of Arsenate from Aqueous Solution Using Nanoscale Iron Particles

2006 ◽  
Vol 41 (2) ◽  
pp. 210-215 ◽  
Author(s):  
Ching Yuan ◽  
Hsing-Lung Lien
Keyword(s):  
Adsorption Capacity ◽  
Zero Point ◽  
Xrd Analysis ◽  
Corrosion Products ◽  
Zerovalent Iron ◽  
Bet Surface Area ◽  
Maximum Adsorption Capacity ◽  
Iron Particles ◽  
Iron Corrosion ◽  
Nanoscale Iron Particles

Abstract Removal of As(V) using nanoscale iron particles was examined in batch reactors. Nanoscale iron particles, utilizing zerovalent iron with a diameter less than 100 nm as reactive materials, have been demonstrated to effectively remediate a wide variety of common environmental contaminants. In this study, characterization of nanoscale iron particles and their corrosion products was conducted using SEM-EDX, XRD, BET surface area analyzer and Laser Zee Meter. SEM-EDX results indicated adsorption of arsenic onto the iron surface, and XRD analysis found the formation of iron corrosion products including lepidocrocite, magnetite and/or maghemite at a reaction period of 7 d. Measurements of zeta potential revealed that the nanoscale iron particles have a zero point of charge at pH 4.4. Increasing adsorption amounts of arsenic with decreasing pH can therefore be attributed to the positive surface charge of the particles at lower pH. The maximum adsorption capacity of nanoscale iron particles determined by the Langmuir equation was about 38.2 mg/g. Normalization of the adsorption capacity to specific surface areas provides insight into the importance of iron types and the contact time of reactions in influencing arsenic uptake.

scholarly journals Investigating the Mechanism of Uranium Removal by Zerovalent Iron

2005 ◽  
Vol 2 (3) ◽  
pp. 235 ◽  
Author(s):  
Chicgoua Noubactep ◽  
Günther Meinrath ◽  
Broder J. Merkel
Keyword(s):  
Groundwater Remediation ◽  
Cost Effective ◽  
Corrosion Products ◽  
Zerovalent Iron ◽  
Iron Corrosion ◽  
Reactive Material ◽  
Test Methodology ◽  
Uranium Removal ◽  
Cost Effective Method ◽  
Or In Agriculture

Environmental Context.Groundwater is the water that fills the spaces between sand, soil, and rock below the water table. It discharges into ecologically sensitive wetlands and is used as drinking water or in agriculture and industry. Inappropriate waste disposal and poor land management can contaminate groundwater and may minimize its use for decades. The common method for pumping contaminated groundwater to the surface for treatment is costly and labour intensive. Zerovalent iron is a new, more cost-effective method of groundwater remediation. Abstract. Zerovalent iron (ZVI) has been proposed as a reactive material in permeable in situ walls for groundwater contaminated by metal pollutants. For such pollutants that interact with corrosion products, the determination of the actual mechanism of their removal is very important to predict their stability in the long term. From a study of the effects of pyrite (FeS2) and manganese nodules (MnO2) on the uranium removal potential of a selected ZVI material, a test methodology (FeS2–MnO2 method) is suggested to follow the pathway of contaminant removal by ZVI materials. An interpretation of the removal potential of ZVI for uranium in the presence of both additives corroborates coprecipitation with iron corrosion products as the initial removal mechanism for uranium.

scholarly journals Remedial Treatment of Corroded Iron Objects by EnvironmentalAeromonasIsolates

2018 ◽  
Vol 85 (3) ◽  
Author(s):  
Wafa M. Kooli ◽  
Thomas Junier ◽  
Migun Shakya ◽  
Mathilde Monachon ◽  
Karen W. Davenport ◽  
...  
Keyword(s):  
Iron Reduction ◽  
Building Materials ◽  
Solid Phase ◽  
Corrosion Products ◽  
Metal Corrosion ◽  
Economic Losses ◽  
Cytotoxic Activities ◽  
Iron Corrosion ◽  
Pathogenic Potential ◽  
Wide Range

ABSTRACTUsing bacteria to transform reactive corrosion products into stable compounds represents an alternative to traditional methods employed in iron conservation. Two environmentalAeromonasstrains (CA23 and CU5) were used to transform ferric iron corrosion products (goethite and lepidocrocite) into stable ferrous iron-bearing minerals (vivianite and siderite). A genomic and transcriptomic approach was used to analyze the metabolic traits of these strains and to evaluate their pathogenic potential. Although genes involved in solid-phase iron reduction were identified, key genes present in other environmental iron-reducing species are missing from the genome of CU5. Several pathogenicity factors were identified in the genomes of both strains, but none of these was expressed under iron reduction conditions. Additionalin vivotests showed hemolytic and cytotoxic activities for strain CA23 but not for strain CU5. Both strains were easily inactivated using ethanol and heat. Nonetheless, given a lesser potential for a pathogenic lifestyle, CU5 is the most promising candidate for the development of a bio-based iron conservation method stabilizing iron corrosion. Based on all the results, a prototype treatment was established using archaeological items. On those, the conversion of reactive corrosion products and the formation of a homogenous layer of biogenic iron minerals were achieved. This study shows how naturally occurring microorganisms and their metabolic capabilities can be used to develop bio-inspired solutions to the problem of metal corrosion.IMPORTANCEMicrobiology can greatly help in the quest for a sustainable solution to the problem of iron corrosion, which causes important economic losses in a wide range of fields, including the protection of cultural heritage and building materials. Using bacteria to transform reactive and unstable corrosion products into more-stable compounds represents a promising approach. The overall aim of this study was to develop a method for the conservation and restoration of corroded iron items, starting from the isolation of iron-reducing bacteria from natural environments. This resulted in the identification of a suitable candidate (Aeromonassp. strain CU5) that mediates the formation of desirable minerals at the surfaces of the objects. This led to the proof of concept of an application method on real objects.

scholarly journals Adsorption capacity of the corrosion products of nanoscale zerovalent iron for emerging contaminants

2020 ◽  
Vol 7 (12) ◽  
pp. 3773-3782
Author(s):  
Junmin Deng ◽  
Sungjun Bae ◽  
Sunho Yoon ◽  
Mathieu Pasturel ◽  
Rémi Marsac ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Emerging Contaminants ◽  
Corrosion Products ◽  
Zerovalent Iron ◽  
Secondary Minerals ◽  
Nanoscale Zerovalent Iron ◽  
Quinolone Antibiotics

Surface bound Fe(ii) on NZVI secondary minerals would affect the fate and mobility of quinolone antibiotics in the environment.

Sorption of Th(IV) onto Iron Corrosion Products: EXAFS Study

2009 ◽  
Vol 43 (8) ◽  
pp. 2825-2830 ◽  
Author(s):  
Ferran Seco ◽  
Christoph Hennig ◽  
Joan de Pablo ◽  
Miquel Rovira ◽  
Isabel Rojo ◽  
...  
Keyword(s):  
Corrosion Products ◽  
Iron Corrosion ◽  
Exafs Study
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