Potential of modified iron-rich foundry waste for environmental applications: Fenton reaction and Cr(VI) reduction.
Summary of "Potential of modified iron-rich foundry waste for environmental applications: Fenton reaction and Cr(VI) reduction."
A magnetic fraction (15%) from a waste of foundry sand (WFS), composed of sand, carbon, bentonite clay and iron (10%) was modified by thermal treatment at 400, 600 and 800°C under inert atmosphere. Mössbauer analyses showed that the thermal treatment increased the amount of Fe(3)O(4) from 25 to 55% by reduction of Fe(2)O(3) and highly dispersed Fe(3+) by the carbon present in the waste. The Fe(3)O(4) caused a significant increase on the activity of two important reactions with application in environmental remediation: the Fenton oxidation of indigo carmine dye with H(2)O(2) and the reduction of Cr(VI) to Cr(III). The magnetic fraction of WFS was also mixed with hematite (Fe(2)O(3)) and thermally treated at 400, 600 and 800°C. This treatment produced large amounts of surface Fe(3)O(4) and increased substantially the rate of Fenton reaction as well as Cr(VI) reduction. This reactivity combined with the presence of carbon (an adsorbent for organic contaminants), bentonite clay (an adsorbent for metallic contaminants) and the granulometry/packing/hydrodynamic features make WFS a promising material for use in reactive permeable barriers.
Departamento de Química, ICEx, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil.
This article was published in the following journal.
Name: Journal of hazardous materials
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21890267
- DOI: http://dx.doi.org/10.1016/j.jhazmat.2011.08.002
Medical and Biotech [MESH] Definitions
Elimination of ENVIRONMENTAL POLLUTANTS; PESTICIDES and other waste using living organisms, usually involving intervention of environmental or sanitation engineers.
Iron-containing proteins that transfer electrons, usually at a low potential, to flavoproteins; the iron is not present as in heme. (McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed)
Iron (II,III) oxide (Fe3O4). It is a black ore of IRON that forms opaque crystals and exerts strong magnetism. The NANOPARTICLES; and MICROSPHERES of its mineral form, magnetite, have many biomedical applications.
Iron or iron compounds used in foods or as food. Dietary iron is important in oxygen transport and the synthesis of the iron-porphyrin proteins hemoglobin, myoglobin, cytochromes, and cytochrome oxidase. Insufficient amounts of dietary iron can lead to iron-deficiency anemia.
Waste products which, upon release into the atmosphere, water or soil, cause health risks to humans or animals through skin contact, inhalation or ingestion. Hazardous waste sites which contain hazardous waste substances go here.
Antimony (Sb) in air pollution control (APC) residues from municipal solid waste incineration has gained increased focus due to strict Sb leaching limits set by the EU landfill directive. Here we stud...
The processes for recycling waste foundry sand are divided between regeneration and beneficial reuse, and the potential for regeneration is higher than that of reuse. In this study, two processes for...
Our knowledge of the relationship between the economy and the environment has increased significantly over recent decades. One of the areas in which this is most apparent is the area of environmental...
This review provides a complete overview over a spectrum of areas where value-added applications of algae are in sight, from conventional food, feed, dietary supplement, and cosmetics to novel technol...
The core-mantle boundary of Earth is a region where iron-rich liquids interact with oxides and silicates in the mantle. Iron enrichment may occur at the bottom of the mantle, leading to low seismic-wa...
To determine the prevalence, genetic and environmental determinants, and potential clinical, personal, and societal impact of iron overload and hereditary hemochromatosis, in a multi-cente...
Comparison of three potential iron sucrose maintenance regimens in pediatric chronic kidney disease patients
Iron deficiency is a common problem in the world and more so in the developing countries with a prevalence of 64 % (using WHO cut-off values of Hb
The purpose of study is to evaluate and compare the effect of iron supplementation when given as iron tablet or fortified biscuit or combined with zinc in the form of tablet on morbidity a...
The objective of this study is to determine the influence of an increase of meat in complementary food on iron status and the effect of an exchange of vegetable oil in the same food on the...