Sorption of Cu2+ and Co2+ ions from aqueous solutions onto sepiolite: An equilibrium, kinetic and thermodynamic study

Lazarević, Slavica; Janković-Čaštvan, Ivona; Radovanović, Željko; Potkonjak, Branislav; Janaćković, Djordje; Petrović, Rada

doi:10.2298/jsc100118005l

Cited by 15 publications

(11 citation statements)

References 22 publications

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“…To the best of our knowledge, iron(III)−modified sepiolite has not previously been used for arsenic sorption from aqueous media. The obtained suspension was diluted to 2 dm 3 and then heated to 70 °C for 48 h. The precipitate was washed, dried and used as the sorbent, designated as Fe-SEP. 15 XRD analysis, FTIR spectroscopy and DTA/TGA 15 confirmed that Fe-SEP maintained the basic structure of sepiolite. The presence of new crystalline Fe phases was not observed, indicating that only amorphous Fe species were present.…”

Section: Introductionmentioning

confidence: 75%

“…A solution could lie in the deposition of Fe(III) oxyhydroxides on porous minerals, such as zeolites, bentonites and sepiolites. 5,7,8,[14][15][16][17] Sepiolite is a fibrous hydrated magnesium silicate 18,19 with a unit cell formula Mg 8 Si 12 O 30 (OH) 4 (H 2 O) 4 ·nH 2 O, n = 6−8. Their structures have blocks and channels running parallel to the fibre axis, which provide excellent potential for the retention of micropollutants from water.…”

Section: Introductionmentioning

confidence: 99%

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The sorption of inorganic arsenic on modified sepiolite: Effect of hydrated iron(III)-oxide

Ilić¹,

Lazarević²,

Rajakovic-Ognjanovic

et al. 2014

J Serb Chem Soc

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The sorption of inorganic arsenic species, As(III) and As(V), from water by sepiolite modified with hydrated iron(III) oxide was investigated at 25 °C through batch studies. The influence of the initial pH value, the initial As concentration, the contact time and the type of water on the sorption capacity was investigated. Two types of water were used, deionised and groundwater. The maximal sorption capacity for As(III) dissolved in deionised water was observed at an initial and final pH value 7.0, while the bonding of As(V) was observed to be almost pH independent for pH value in the range from 2.0 to 7.0, while a significant decrease in the sorption capacity was observed at pH values above 7.0. The sorption capacity at initial pH 7.0 was about 10 mg g -1 for As(III) and 4.2 mg g -1 for As(V) in deionised water. The capacity in groundwater was decreased by 40 % for As(III) and by 20 % for As(V). The Langmuir model and pseudo-second order kinetic model revealed good agreement with the experimental results. The results showed that Fe(III)-modified sepiolite exhibits significant affinity for arsenic removal and it has the potential for application in water purification processes.

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Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

The sorption of inorganic arsenic on modified sepiolite: Effect of hydrated iron(III)-oxide

Ilić¹,

Lazarević²,

Rajakovic-Ognjanovic

et al. 2014

J Serb Chem Soc

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“…Since clay minerals are already known to be efficient sorbent of various pollutants [9][10][11][12][13][14][15][16][17][18], bentonite was also used for the Zn 2+ removal from aqueous solution [19,20].…”

Section: Introductionmentioning

confidence: 99%

Sorption of zinc by novel pH-sensitive hydrogels based on chitosan, itaconic acid and methacrylic acid

Milosavljević

Ristić

Perić-Grujić

et al. 2011

Journal of Hazardous Materials

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“…Thus the surface complexes occurs between the copper species and the negatively charged adsorbent [40] (Scheme 1).…”

Section: Adsorption Mechanismmentioning

confidence: 99%

Investigation of α‐iron oxide‐coated polymeric nanocomposites capacity for efficient heavy metal removal from aqueous solution

Talooki

Ghorbani

Ghoreyshi

2015

Polymer Engineering & Sci

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In the present study, PS@a-Fe 2 O 3 nanocomposites were prepared by chemical microemulsion polymerization approach and the ability of magnetic beads to remove Cu(II) ions from aqueous solutions in a batch media was investigated. Various physico-chemical parameters such as pH, initial metal ion concentration, temperature, and equilibrium contact time were also studied. Adsorption mechanism of Cu 21 ions onto magnetic polymeric adsorbents has been investigated using Langmuir, Freundlich, Sips and Redlich-Petersen isotherms. The results demonstrated that the PS@a-Fe 2 O 3 nanocomposite is an effective adsorbent for Cu 21 ions removal. The Sips adsorption isotherm model (R 2 > 0.99) was more in consistence with the adsorption isotherm data of Cu(II) ions compared to other models and the maximum adsorbed amount of copper was 34.25 mg/g. The adsorption kinetics well fitted to a pseudo second-order kinetic model. The thermodynamic parameters (DH8, DS8, and DG8) were calculated from the temperature dependent sorption isotherms, and the results suggested that copper adsorption was a spontaneous and exothermic process.

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Sorption of Cu2+ and Co2+ ions from aqueous solutions onto sepiolite: An equilibrium, kinetic and thermodynamic study

Cited by 15 publications

References 22 publications

The sorption of inorganic arsenic on modified sepiolite: Effect of hydrated iron(III)-oxide

The sorption of inorganic arsenic on modified sepiolite: Effect of hydrated iron(III)-oxide

Sorption of zinc by novel pH-sensitive hydrogels based on chitosan, itaconic acid and methacrylic acid

Investigation of α‐iron oxide‐coated polymeric nanocomposites capacity for efficient heavy metal removal from aqueous solution

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