The effects of MnO2 on sorption and oxidation of Cr(III) by soils

Stępniewska, Zofia; Bucior, K.; Bennicelli, R. P.

doi:10.1016/j.geoderma.2004.01.015

Cited by 55 publications

(30 citation statements)

References 11 publications

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“…The redox reaction between Mn oxide minerals and Cr(III) occurred on the interface of minerals and solution. Adsorption of Cr(III) and desorption of Cr(VI) on the surface of minerals were two steps for the oxidation reaction before and after electrons transfer from Cr(III) to the minerals (Stepniewska et al, 2004). Adsorption of Cr(III) on the surface of Mn oxide minerals would enhance the oxidation of Cr(III), while adsorption of Cr(VI) would hamper adsorption and subsequent oxidation of Cr(III).…”

Section: Cr(iii) Oxidization By the Synthesized Mn Oxide Mineralsmentioning

confidence: 99%

“…They commonly have a lower PZC (point of zero charge), large surface area and strong acid sites, allowing high adsorption capacity, and excellent oxidation and catalysis activity (Post, 1999). To a large extent they influence and control the release, transfer, availability and toxicity of many nutrient elements, heavy metals and organic contaminants in soils and sediments (Oscarson et al, 1981;Pan, 1990;Stepniewska et al, 2004;Lu, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…However, single-phased Mn oxide minerals are not easy to synthesize due to their non-stoichiometric composition, various species and close formation conditions. Many studies have focused on the surface properties, interactions with pollutants and mechanisms of a few Mn oxide minerals or aggregates of Mn oxides in soils, such as birnessite, cryptomelane, Mn coatings, and Mn nodules (Mckenzie, 1980;Oscarson et al, 1981;Shindo and Huang, 1984;Matocha et al, 2001;Lanson et al, 2002;Manceau et al, 2002;Weaver et al, 2002;Shaughnessy et al, 2003;Stepniewska et al, 2004;Tan et al, 2005). However, information on comparison of properties for such Mn oxide minerals or aggregates of Mn oxides is limited.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Adsorption and redox reactions of heavy metals on synthesized Mn oxide minerals

Feng

Zhai

Tan

et al. 2007

Environmental Pollution

261

139

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Section: Cr(iii) Oxidization By the Synthesized Mn Oxide Mineralsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption and redox reactions of heavy metals on synthesized Mn oxide minerals

Feng

Zhai

Tan

et al. 2007

Environmental Pollution

261

139

View full text Add to dashboard Cite

“…Abiotic laboratory studies have shown that in the presence of Fe(II)-bearing minerals and organic acids (acetic acids and mandelic acids), Cr(VI) is reduced to Cr(III) in the subsurface (Eary & Rai 1988). Similarly, Mnoxide containing minerals have been shown to oxidize Cr(III) to Cr(VI) (Stepniewska et al 2004;Guha 2004) influencing greatly the transport of this contaminant. Guha (2004) studied the chromium transport in water-saturated conditions with columns that appear to be homogeneously packed with either b-MnO 2 -coated sand, or quartz sand in the presence of a facultative anaerobe Shewanella alga Simidu (BrY-MT) ATCC 55627.…”

Section: Transport and Redox Reactionsmentioning

confidence: 99%

Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides. 3. Influence of Chemical Speciation and Bioavailability on Contaminants Immobilization/Mobilization Bio-processes

Hullebusch

Lens

Tabak

2005

Rev Environ Sci Biotechnol

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The biotransformation of metals is an exciting, developing strategy to treat metal contamination, especially in environments that are not accessible to other remediation technologies. However, our ability to benefit from these strategies hinges on our ability to monitor these transformations in the environment. That's why remediation of contaminated sediments and soil requires detailed in situ characterization of the speciation of the toxic substances and their transformations with respect to time and spatial distribution. The present paper gives an overview of the literature regarding research performed in the laboratory as well as in the field.

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“…Prolonged exposure to even small concentrations can cause lung cancer, liver and kidney damage and reproductive problems (Terry, 2004). The cationic trivalent chromium on the other hand is an important mineral supplement and it is less mobile compared to Cr (Stepniewska, et al, 2004). Several technologies have been developed for the removal of chromium in aqueous solutions over the years.…”

Section: Introductionmentioning

confidence: 99%

Removal of Cr from synthetic wastewater by sorption into volcanic ash soil

Babel

Opiso

2007

Int. J. Environ. Sci. Technol.

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ABSTRACT:The possibility of using volcanic ash soils (VAS) or Andisols as a low-cost and natural adsorbent is investigated in this study for the removal of Cr (VI) from synthetic wastewater. Andisols can be used as adsorbent because they are characterized by the presence of non-crystalline secondary minerals such as allophane and imogolite that show variable charge characteristics and have the ability to retain cations and anions. The adsorption of Cr on to two VAS from Mt. Isarog and Mandalagan (B-Horizon), Philippines, was carried out at ambient temperature using batch adsorption studies. The effects of different parameters such as amount of adsorbent, contact time, initial Cr concentration and pH of the solution were investigated. The results showed that the VAS from Isarog is more effective in the removal of Cr than in Mandalagan. The maximum removal efficiency of the Isarog soil for a Cr concentration of 10 mg/L reached 89% with a dose of 20 g/L at a moderately acidic pH of 3. The Mandalagan soil on the other hand could remove only 65% at the same pH conditions and parameters. The difference in the removal of the two soils may be attributed to their physico-chemical properties in which the Isarog soil has higher clay content, porosity and lower bulk density. Isarog soil has fine particles with higher surface area and more active noncrystalline minerals and thus has higher removal efficiency than Mandalagan soil. Based on the results, the use of VAS from Isarog appears to be economical and an alternative to commercially available adsorbents for the removal of Cr from contaminated wastewater.

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The effects of MnO2 on sorption and oxidation of Cr(III) by soils

Cited by 55 publications

References 11 publications

Adsorption and redox reactions of heavy metals on synthesized Mn oxide minerals

Adsorption and redox reactions of heavy metals on synthesized Mn oxide minerals

Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides. 3. Influence of Chemical Speciation and Bioavailability on Contaminants Immobilization/Mobilization Bio-processes

Removal of Cr from synthetic wastewater by sorption into volcanic ash soil

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