Influence of Organic Matter on the Iron Oxide Mineralogy of Volcanic Soils

Pizarro, Carmen; Escudey, Mauricio; Fabris, José Domingos

doi:10.1023/b:hype.0000003764.17385.a9

Cited by 25 publications

(23 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ZP was calculated using the Helmholtz Smoluchowski equation [25]. The different composition in Fe species was previously described [26]. Briefly, the active and free iron oxides were extracted by using a 0.2 M ammonium oxalate at pH 3 and a dithionite-citrate-bicarbonate solution, respectively (Fe OX and Fe DCB ), and iron oxides complexed by the organic matter were extracted by using a 0.1 M sodium pyrophosphate solution (Fe PYRO ).…”

Section: Soils Characterizationmentioning

confidence: 99%

Modeling the sorption kinetic of metsulfuron-methyl on Andisols and Ultisols volcanic ash-derived soils: Kinetics parameters and solute transport mechanisms

Cáceres

Escudey

Fuentes

et al. 2010

Journal of Hazardous Materials

View full text Add to dashboard Cite

Section: Soils Characterizationmentioning

confidence: 99%

Modeling the sorption kinetic of metsulfuron-methyl on Andisols and Ultisols volcanic ash-derived soils: Kinetics parameters and solute transport mechanisms

Cáceres

Escudey

Fuentes

et al. 2010

Journal of Hazardous Materials

View full text Add to dashboard Cite

“…The collected soil material was sieved in the field, so to obtain a fraction with mean particle diameter ≤2 mm (whole soil), and packed under roughly the corresponding field moisture atmosphere [7,8].…”

Section: Methodsmentioning

confidence: 99%

Magnetic minerals from volcanic Ultisols as heterogeneous Fenton catalysts

et al. 2009

Self Cite

View full text Add to dashboard Cite

This study was devoted to the evaluation of the effectiveness of Fenton catalysts, based on magnetically-concentrated portions of iron oxide-rich sand fractions from two magnetic Ultisols, derived from volcanic materials of southern Chile. The samples were labeled according to the municipality where the sample sites are geographically located, namely Metrenco and Collipulli, and were characterized with Mössbauer spectroscopy at 298 K and saturation magnetization (σ ) measurements. Mössbauer data revealed a complex magnetic hyperfine structure for these magnetic portions from both soil-sand materials, suggesting relatively complex mineral assemblages. The monitored rate of H 2 O 2 decomposition via heterogeneous Fenton reaction revealed that materials from the Collipulli soil are more efficient Fenton catalyst than are those from the Metrenco soil. The reasons for these differences are from now on being explored on basis of a more detailed chemical investigation of these samples.

show abstract

“…Kwan and Voelker (2003) compared iron-based catalysts for organic compound oxidation, revealing that ferrihydrite, a short-range iron oxide mineral, exhibited the lowest efficiency. In addition, Filip et al (2007) Table 2 (Mella and Kühne 1985;Pizarro et al 2003;Escudey et al 2004;Pizarro et al 2017).…”

Section: Technological Applications Of Natural Iron Oxidesmentioning

confidence: 99%

“…On the other hand, Andisols, younger and less evolved than Ultisols, have higher organic matter content. AsPizarro et al (2003) demonstrated, high organic matter content hinders the crystallization processes of the mineral fraction, decreasing spectra resolution. Following pre-treatment at 500 ºC, signals at the 57 Fe Mössbauer spectra for allsamples are transformed.…”

mentioning

confidence: 98%

Iron-bearing minerals from soils developing on volcanic materials from Southern Chile: Application in heterogeneous catalysis

Pizarro

Escudey

Gacitúa

et al. 2018

J. Soil Sci. Plant Nutr.

View full text Add to dashboard Cite

Chilean soils derived from volcanic ashes are a natural source of iron oxides. Due to their properties, mineralogy, and surface characteristics, iron oxides from Chilean soils are potential candidates for technological applications such as heterogeneous catalysis. However, before a direct application in catalysis, pre-treatment methods are necessary to concentrate iron oxides from bulk volcanic soils. Here, we provide a comprehensive review of pre-treatment strategies for iron oxide concentration including physical separation and selective chemical dissolutive methods for application in catalytic processes, such as the water gas shift (WGS) and Fenton reactions. For preparation of WGS catalyst from volcanic soils, thermal treatment has been demonstrated to be effective, yielding enhanced results for Andisols compared to Ultisols. Based on mineralogical characterisation, it seems that WGS reaction efficiency depends on mineralogical phase shift and the changes of Fe 2+ /Fe 3+ ratio, produced through heating. In addition, Ultisols have shown as efficient catalysts in Fenton and Fenton-like processes, after application of physical and chemical pre-treatments to different size-fractions of the soil sample, improving the yield performance of catalysts. Magnetic separates from the Ultisol sand fraction (compared to the silt+clay fractions) demonstrate the best catalytic performance as Fenton reagent due to their natural magnetite and titanomagnetite content. Application of NaOH selective dissolutive treatment to silt+clay fraction of volcanic soils also produces Fenton and Fenton-like catalyst with improved performance. Our review indicates that catalytic performance can be explained not only by the iron oxide mineral content but also by their characteristics and magnetic properties.The application of the appropriate physical and chemical pre-treatment methods can modulate and enhance the catalytic capabilities of iron oxides from volcanic soils.

show abstract

Influence of Organic Matter on the Iron Oxide Mineralogy of Volcanic Soils

Cited by 25 publications

References 5 publications

Modeling the sorption kinetic of metsulfuron-methyl on Andisols and Ultisols volcanic ash-derived soils: Kinetics parameters and solute transport mechanisms

Modeling the sorption kinetic of metsulfuron-methyl on Andisols and Ultisols volcanic ash-derived soils: Kinetics parameters and solute transport mechanisms

Magnetic minerals from volcanic Ultisols as heterogeneous Fenton catalysts

Iron-bearing minerals from soils developing on volcanic materials from Southern Chile: Application in heterogeneous catalysis

Contact Info

Product

Resources

About