Chemical Reduction of Hexavalent Chromium Present in Contaminated Soil using a Packed‐bed Column Reactor

Franco, Débora V.; Silva, Leonardo M. Da; Jardim, Wilson F.

doi:10.1002/clen.200900180

Cited by 6 publications

(4 citation statements)

References 22 publications

(25 reference statements)

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“…This is supported by earlier studies which have shown that the reduction of Cr(VI) to Cr(III) with Fe 0 nanoparticles was found to increase with the decrease in soil pH. (Debora Franco et al 2009). …”

Section: Resultssupporting

confidence: 83%

Conjunctive effect of CMC–zero-valent iron nanoparticles and FYM in the remediation of chromium-contaminated soils

et al. 2013

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Chromium is an important industrial metal used in various products and processes but at the same time causing lethal environmental hazards. Remediation of Cr-contaminated soils poses both technological and economic challenges, as conventional methods are often too expensive and difficult to operate. Zero-valent iron particles at nanoscale are proposed to be one of the important reductants of Cr(VI), transforming the same into nontoxic Cr(III). In the present investigation, soils contaminated with Cr(VI) are allowed to react with the various loadings of zero-valent iron nanoparticles (Fe 0 ) for a reaction period of 24 h. Fe 0 nanoparticles were synthesized by the reduction of ferrous sulfate in the presence of sodium borohydride and stabilized with carboxy methyl cellulose and were characterized by scanning electron microscopy, energy dispersion spectroscopy, X-ray diffraction, UV-vis spectrophotometer, Fourier transform-infra red spectrophotometer, Raman spectroscopy, dynamic light scattering technique and zeta potential. Further, this work demonstrates the potential utilization of farm yard manure (FYM) and Fe 0 nanoparticles in combination and individually for the effective remediation of Cr(VI)-contaminated soils. An increase in the reduction of Cr(VI) from 60 to 80 % was recorded with the increase in the loading of Fe 0 nanoparticles from 0.1 to 0.3 mg/100 g individually and in combination with FYM ranging from 50 to 100 mg/100 g soil.

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Section: Resultssupporting

confidence: 83%

Conjunctive effect of CMC–zero-valent iron nanoparticles and FYM in the remediation of chromium-contaminated soils

et al. 2013

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“…Sample S 4 presenting a low content of Cr(VI) was collected in a former wood treatment facility, whereas the sample S 5, presenting a high content of Cr(VI), was collected in an industrial landfill located in a former chromite mining unit used to process different chromium salts. 18,19 Samples S 2 and S 3 were obtained from different non-contaminated areas located in the wood treatment facility and in the industrial landfill mentioned above, respectively. These samples were used in the present work as the background soil samples (absence of contamination).…”

Section: Samples and Sample Preparationmentioning

confidence: 99%

A screening method for detection of hexavalent chromium levels in soils

Franco¹,

Rodrigues²,

Bavaresco³

et al. 2011

Quím. Nova

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Recebido em 22/7/10; aceito em 15/2/11; publicado na web em 15/4/11 A rapid and low cost method to determine Cr(VI) in soils based upon alkaline metal extraction at room temperature is proposed as a semi-quantitative procedure to be performed in the field. A color comparison with standards with contents of Cr(VI) in the range of 10 to 150 mg kg -1 was used throughout. For the different types of soils studied, more than 75% of the fortified soluble Cr(VI) were recovered for all levels of spike tested for both the proposed and standard methods. Recoveries of 83 and 99% were obtained for the proposed and the standard methods, respectively, taking into account the analysis of a heavily contaminated soil sample.

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“…The most commonly applied treatment methods for removing metal ions from wastewaters include adsorption [5][6][7], biosorption [8][9][10][11], chemical precipitation [12], reverse osmosis [13], reduction [14], solvent extraction [15], ion exchange [16,17], filtration, and membrane processes [18,19]. Among them, ion exchange is one of the most popular methods for the removal of chromium ion from wastewaters.…”

Section: Introductionmentioning

confidence: 99%

Development of Polymeric and Polymer‐Based Hybrid Adsorbents for Chromium Removal from Aqueous Solution

Kaya

Duranoğlu

Beker

et al. 2011

CLEAN Soil Air Water

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Ferric oxide-loaded hybrid sorbents are environmentally benign and exhibit sorption behaviors for chromium removal from waters. In the current study, glycidyl methacrylate-based polymer (GMD) and nanosized ferric oxide loaded glycidyl methacrylatebased polymer (GMDFe) were prepared and assayed to examine the effect of ferric oxide loading on chromium sorption from aqueous solution for the first time from the equilibrium and kinetic points of view. The experimental equilibrium data, suitably fitted by the Langmuir and Freundlich isotherms, have shown that ferric oxide loaded hybrid sorbent exhibits higher adsorption capacity than glycidyl methacrylate-based polymer (GMD). The Langmuir isotherm model was found to be the most suitable one for the Cr(VI) adsorption. The maximum adsorption capacities of GMD and GMDFe sorbents were determined at pH 4 as 109.54 and 157.52 mg/g, respectively. A series of column experiments was carried out to determine the breakthrough curves. The column was regenerated by eluting Cr(VI) using NaOH (10% w/v) solution after adsorption studies.

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Chemical Reduction of Hexavalent Chromium Present in Contaminated Soil using a Packed‐bed Column Reactor

Cited by 6 publications

References 22 publications

Conjunctive effect of CMC–zero-valent iron nanoparticles and FYM in the remediation of chromium-contaminated soils

Conjunctive effect of CMC–zero-valent iron nanoparticles and FYM in the remediation of chromium-contaminated soils

A screening method for detection of hexavalent chromium levels in soils

Development of Polymeric and Polymer‐Based Hybrid Adsorbents for Chromium Removal from Aqueous Solution

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