Sorption and desorption of Fe(III) on natural and chemically modified zeolite

Földesová, M.; Dillinger, P.; Lukáč, P.

doi:10.1007/bf02345926

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…When the modification was performed in acidic medium, only 1.41% Fe 2 O 3 was achieved. In contrast, iron exchange by the method proposed by [11] for ZSM-5 zeolites using FeCl 3 in acetyl acetonate solution produced here a loading of 1. from this loaded sample was tested in water without pH adjustment and amounted 0.1-0.2% after 24 h. This result is a prominent feature, since a high iron uptake can lead to up to 5% leachability and up to 20% in acidic medium as reported by Földes-ová [22].…”

Section: In Situ Characterization Of Parent and Iron Modified Tuffsmentioning

confidence: 82%

In situ and ex situ study of the enhanced modification with iron of clinoptilolite-rich zeolitic tuff for arsenic sorption from aqueous solutions

Dávila-Jiménez

Elizalde-González

Mattusch

et al. 2008

Journal of Colloid and Interface Science

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Section: In Situ Characterization Of Parent and Iron Modified Tuffsmentioning

confidence: 82%

In situ and ex situ study of the enhanced modification with iron of clinoptilolite-rich zeolitic tuff for arsenic sorption from aqueous solutions

Dávila-Jiménez

Elizalde-González

Mattusch

et al. 2008

Journal of Colloid and Interface Science

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“…Chromium, an important element from environmental point of view has been the subject of several studies wherein its accumulation on cheaper materials like flyashwollastonite (Pandy et al, 1984), zeolites (Foldesova et al, 2000), modified coconut husk (Low et al, 1997), rice husk (Khalid et al, 1999), Haro river sand (Hasany and Chaudhry, 1998), seed of leguminous crops (Voropanova et al, 1998) and modified rice husks (Lee et al, 1998) have been investigated. Chromium pollution is a serious problem facing our country due to the tannery industry.…”

Section: Introductionmentioning

confidence: 99%

Sawdust: Cost Effective Scavenger for the Removal of Chromium(III) Ions from Aqueous Solutions

Ahmad

2005

Water Air Soil Pollut

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Cr(III) ions sorption onto sawdust of spruce (Picea smithiana) has been studied thoroughly using radiotracer technique. Maximum sorption (94%) of Cr(III) ions (8.98 × 10 −5 M) onto sorbent surface is achieved from deionized water in 20 min agitation time using 200 mg of sawdust. The sorption data followed the Freundlich, Dubinin-Radushkevich (D-R) and Langmuir isotherms. Freundlich constants l/n = 0.86 ± 0.07 and C e = 85.0 ± 25.8 mmole g −1 have been estimated. Sorption capacity, X m = 0.82 ± 0.3 mmole g −1 , β = −0.00356 ± 0.00017 kJ 2 mole −2 and energy, E = 11.9 ± 0.3 kJ mole −1 have been evaluated using D-R isotherm. The Langmuir constants Q = 5.8 ± 0.2 µmole g −1 and b = (7.4 ± 0.5) × 10 4 dm 3 mole −1 have been calculated. The variation of sorption with temperature yields thermodynamic parameters H = −11.6 ± 0.3 kJ mole −1 , S = −16.2 ± 0.9 J mole −1 K −1 and G = −6.8 ± 0.3 kJ mole −1 at 298 K. The negative value of enthalpy and free energy reflect the exothermic and spontaneous nature of sorption respectively. Among the anions studied oxalate, citrate, carbonate and borate have reduced the sorption. The cations Y(III), Ce(II) and Ca(II) suppressed sorption. The sawdust column can be used to separate Cr(III) ion from Cs(I), I(I),Tc (VII) and Se (IV).

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“…Sorption is considered superior over other techniques because of its higher efficiency, low cost and simple operation [3]. Chromium, an important element from environmental point of view has been the subject of several studies wherein its accumulation on cheaper materials like flyash wollastonite [4], zeolites [5], modified coconut husk [6], rice husk [7],…”

Section: Introductionmentioning

confidence: 99%

Removal of Noxious Cr (VI) and Cr (III) Ions by Hierarchically Tailored Pseudo-Monolithic Silica/Activated Carbon Composite

Melhi¹

2022

MCPS

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In the present study, 2.34 m (average) silica particles with large pore size (363 Å) have been prepared from bulk monoliths by using sol-gel method and were then chemically modified by reaction with a C-18 and was used for the adsorption of Cr (VI)and Cr (III) ions from wastewater. The prepared adsorbent was characterized by Scanning electronic microscope (SEM) and X-ray Diffraction (XRD) analysis before and after the adsorption of Cr (III) and Cr (VI) ions. The amount of Cr (III) and Cr (VI) adsorbed was detected by Atomic Absorption spectroscopy (AAS). The 90 % Cr (VI) and 98 % Cr (III) were achieved at pH3 and, 6 respectively. The process followed pseudo 2 nd order kinetics, Langmuir and Freundlich isotherms well. The ΔG values were -50.02 and -49.62 kJ mol −1 , for Cr(VI) ions and Cr(III) ions respectively, which show spontaneous adsorption of Cr(VI) and Cr(III) ions on to AC surface. ΔH was 44.18 kJ mol -1 for Cr(VI) and 39.55 kJ mol −1 "for Cr(III) ions, are showing the endothermic nature of adsorption. The ΔS (152 J mol -1 K -1 for Cr(VI) and 139.88 mol -1 K -1 for Cr(III) ions) showing sorbate/sorbent complex stability.

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Sorption and desorption of Fe(III) on natural and chemically modified zeolite

Cited by 9 publications

References 6 publications

In situ and ex situ study of the enhanced modification with iron of clinoptilolite-rich zeolitic tuff for arsenic sorption from aqueous solutions

In situ and ex situ study of the enhanced modification with iron of clinoptilolite-rich zeolitic tuff for arsenic sorption from aqueous solutions

Sawdust: Cost Effective Scavenger for the Removal of Chromium(III) Ions from Aqueous Solutions

Removal of Noxious Cr (VI) and Cr (III) Ions by Hierarchically Tailored Pseudo-Monolithic Silica/Activated Carbon Composite

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