Evaluation of the Adsorption of Hexavalent Chromium on Kaolinite and Illite

Ajouyed, Omar; Hurel, Charlotte; Marmier, Nicolas

doi:10.4236/jep.2011.210155

Cited by 44 publications

(30 citation statements)

References 15 publications

(16 reference statements)

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“…Thus, the available adsorption sites are easily occupied by Cr(VI) at low initial concentrations, resulting in a higher Cr removal efficiency from the solution [56]. At the initial Cr(VI) concentration of 10 -6 M Cr(VI) at pH 5- adsorption on these minerals [21,48,56].…”

Section: Modeling Approach For Kaolinite and Illitementioning

confidence: 99%

Chromate adsorption on selected soil minerals: Surface complexation modeling coupled with spectroscopic investigation

Veselská

Fajgаr

Číhalová

et al. 2016

Journal of Hazardous Materials

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Section: Modeling Approach For Kaolinite and Illitementioning

confidence: 99%

Chromate adsorption on selected soil minerals: Surface complexation modeling coupled with spectroscopic investigation

Veselská

Fajgаr

Číhalová

et al. 2016

Journal of Hazardous Materials

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“…The Langmuir and Freundlich isotherm models were applied to the mq and river water experiments to characterize the sorption of Cr (VI) onto kaolin under these conditions. The Langmuir isotherm model assumes single layer adsorption on a finite number of homogeneous adsorption sites and is expressed in the following equation (Acharya et al, ; Ajouyed et al, ):

\frac{C_{e}}{q_{e}} = \frac{1}{(Q_{m} \times b)} + \frac{C_{e}}{Q_{m}}

…”

Section: Resultsmentioning

confidence: 99%

Fractionation Behavior of Chromium Isotopes during the Sorption of Cr (VI) on Kaolin and its Implications for Using Black Shales as a Paleoredox Archive

Frank

Klaebe

2019

Geochem Geophys Geosyst

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Chromium stable isotope variations in marine black shales are increasingly used to constrain redox changes though time. However, how well black shale δ53Cr values represent ambient seawater δ53Cr values is difficult to assess as black shales contain both detrital and authigenic mineral phases, of which only authigenic phases are expected to mirror seawater, while detrital silicate phases are expected to show igneous δ53Cr values. In order to correct for detrital contamination, it is thus imperative to know whether detrital minerals are in fact characterized by igneous δ53Cr values. To investigate this further, three sets of Cr (VI) batch sorption experiments were conducted, reacting kaolin with (1) with a synthetic Cr (VI) solution, (2) with Cr (VI) doped river water, and (3) with Cr (VI) doped seawater. Further, sequential leaches were applied to reacted kaolin to evaluate how well sorbed Cr (VI) can be leached. The experiments revealed that Cr (VI) readily sorbs on kaolin, changing its Cr concentration and isotopic composition. In river water, kaolin sorbed up to 36 μg of Cr (VI) per gram of kaolin and recorded a negative offset in bulk δ53Cr of up to 0.26‰ relative to unreacted kaolin, while no sorption was observed in seawater. Our leaching experiments revealed that already a weak acid leach (0.5M HCl) readily mobilizes some of the sorbed Cr from kaolin, which when applied to black shales will likely contaminate leachates designed to release authigenic Cr. This has major implications for the application of Cr stable isotopes in black shales as marine paleoredox archives.

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“…With an increase of pH at values higher than 2.5 the adsorption capacities of the studied material decrease. At lower pH the predominant species of chromium ions is HCrO 4 − and the adsorbent surface present an increase in H + ions [27,28]. The strong electrostatic attraction between positively charged adsorbent surface and chromate ions can be the explanation of the increasing of the adsorption capacity of the studied materials at lower pH values.…”

Section: Effect Of Ph On the Adsorption Capacitymentioning

confidence: 89%

“…When the monolayer is saturated, the maximum adsorption occurs. In addition the model assumes that the adsorbate molecules cannot migrate on the adsorbent surface, the energy of adsorption being constant [27][28][29]. The linear form of Langmuir isotherm is described by the Equation (2): e e e L m m…”

Section: Modelingmentioning

confidence: 99%

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Heavy metal removal from waste waters by phosphonate metal organic frameworks

Maranescu

Lupa

Visa

2017

Pure and Applied Chemistry

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Abstract:The increase attention in the area of phosphonate metal organic framework is exemplified with a variety of applications and a rich chemistry of these compounds. Water pollution caused by heavy metal ions is a major concern due to their toxicity to many life forms. In order to decrease the heavy metals impact upon the environment various technologies of water treatment such as: chemical sedimentation, ion exchange, redox process are studied. The tendency is to find a versatile and economical method of heavy metals removal from waste waters. Phosphonate metal organic frameworks were obtained by the reaction of Ni(CH 3 COO) 2 · 4H 2 O, phosphonic acid (phosphonoacetic (CP), vinyl phosphonic acid (VP) and N,N-bis(phosphonomethyl)glycine (Gly)) in hydrothermal conditions. Coordination polymers synthesized were characterized by FTIR, XRD, scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA). The adsorption processes represent a very good alternative for heavy metals removal due to low costs and ease of operation. In the present paper the adsorption performance of the mentioned materials in the removal process of heavy metals from aqueous solutions, was studied using the batch method. The adsorption conditions were investigated by varying the initial pH, contact time and adsorbate initial concentration for chromium metal ions removal from aqueous solutions. It was found that the adsorption efficiency of the studied materials in the removal process of Cr(VI) ions from aqueous solutions is in the following order: Ni-CP < Ni-Gly ≤ Ni-VP.

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Evaluation of the Adsorption of Hexavalent Chromium on Kaolinite and Illite

Cited by 44 publications

References 15 publications

Chromate adsorption on selected soil minerals: Surface complexation modeling coupled with spectroscopic investigation

Chromate adsorption on selected soil minerals: Surface complexation modeling coupled with spectroscopic investigation

Fractionation Behavior of Chromium Isotopes during the Sorption of Cr (VI) on Kaolin and its Implications for Using Black Shales as a Paleoredox Archive

Heavy metal removal from waste waters by phosphonate metal organic frameworks

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