Equilibrium studies on the adsorption of Co(II) and Ni(II) by modified silica gels: One-component and binary systems

Repo, Eveliina; Petrus, R.; Sillanpää, Mika; Warchoł, J.

doi:10.1016/j.cej.2011.06.019

Cited by 45 publications

(22 citation statements)

References 40 publications

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“…So, the adsorption capacity of Cr(VI) decreased at higher pH. The result shows that EDTA‐DW could act as a good adsorbent for adsorbing Cr(VI) at low pH in practical application …”

Section: Resultsmentioning

confidence: 92%

Utilization of industrial waste as a novel adsorbent: Mono/competitive adsorption of chromium(VI) and nickel(II) using diatomite waste modified by EDTA

Sha

Fan

2017

Applied Organom Chemis

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The adsorption of Cr(VI) and Ni(II) using ethylenediaminetetraacetic acidmodified diatomite waste (EDTA-DW) as an adsorbent in single and binary systems was investigated. The EDTA-DW was characterized using various analytical techniques, including Fourier transform infrared spectroscopy, thermogravimetric analysis, Brunauer-Emmett-Teller measurements, X-ray diffraction, scanning electron microscopy and energy-dispersive spectrometry.The adsorption experiment was conducted by varying pH, adsorbent dosage, initial concentration and temperature. In the single system, the sorption data for Cr(VI) fitted the Langmuir isotherm, but the Ni(II) adsorption data fitted well the Freundlich isotherm. The maximum sorption capacity of Cr(VI) and Ni(II) was 2.9 mg g −1 at pH = 3 and 3.64 mg g −1 at pH = 8, respectively. The kinetic data for both Cr(VI) and Ni(II) followed well the pseudo-second-order kinetic model in single and binary systems. Meanwhile, the extended Langmuir and extended Freundlich multicomponent isotherm models were found to fit the competitive adsorption data for Cr(VI) and Ni(II). In addition, in the binary system, the existence of Ni(II) hindered the adsorption of Cr(VI), but the presence of Cr(VI) enhanced the removal of Ni(II). This study provides some realistic and valid data about the usage of modified diatomite waste for the removal of metal ions.

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“…So, the adsorption capacity of Cr(VI) decreased at higher pH. The result shows that EDTA‐DW could act as a good adsorbent for adsorbing Cr(VI) at low pH in practical application …”

Section: Resultsmentioning

confidence: 92%

Utilization of industrial waste as a novel adsorbent: Mono/competitive adsorption of chromium(VI) and nickel(II) using diatomite waste modified by EDTA

Sha

Fan

2017

Applied Organom Chemis

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“…Although this is a practice commonly used, the results obtained for mono-component systems generally do not predict the behavior of a binary system. This behavior is observed because the parameters do not take into account the interactions between the ions present (Repo et al, 2011). Aksu et al (2002) proposed that an interaction parameter should be added to Eqs.…”

Section: +mentioning

confidence: 99%

Biosorption study of Ni2+ and Cr3+ by Sargassum filipendula: kinetics and equilibrium

Seolatto

Martins

Tavares

et al. 2014

Braz. J. Chem. Eng.

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-In this work, the biosorption of Cr 3+ and Ni 2+ by Sargassum filipendula pre-treated with CaCl 2 was studied. Kinetic and equilibrium experiments were carried out for mono-and multi-component solutions in a batch reactor at pH 3.0 and 30 ºC. The results from the kinetic experiments showed that Cr 3+ adsorbs slower than Ni 2+ . This behavior was explained by means of a mechanistic analysis, which showed that Cr 3+ uptake presented three adsorption stages, whereas Ni 2+ adsorption presents only two. The mono-component equilibrium data, along with binary kinetic data obtained from mono-component experiments, showed that, although the kinetics for Cr 3+ removal are slower, the biomass had a stronger affinity for this ion. Almost all Ni 2+ is desorbed from the biomass as Cr 3+ adsorbs. The binary equilibrium data also presented this behavior. The binary data was also modeled by using modified forms of the Langmuir, Jain and Snoeyink, and Langmuir-Freundlich isotherms. However, the prediction obtained presented low accuracy. An alternative modeling with artificial neural networks was presented and the results showed that this technique could be a promising tool to represent binary equilibrium data. The main contribution of this work was to obtain experimental data for Cr 3+ /Ni 2+ adsorption, which is a system rarely found in the literature and that provides information that could be used in process modeling and simulation.

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“…The bi-Langmuir isotherm was first suggested by Graham (1953) and has been applied in recent adsorption studies (Karthikeyan et al 2004;Repo et al 2009Repo et al , 2011. While the bi-Langmuir isotherm is based on the theory of Langmuir, the model assumes that there are two favoured adsorption sites on the surface.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Sulphate Removal from Water by Carbon Residue from Biomass Gasification: Effect of Chemical Modification Methods on Sulphate Removal Efficiency

Runtti¹,

Tuomikoski²,

Kangas³

et al. 2016

BioResources

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Sulphate removal from mine water is a problem because traditional chemical precipitation does not remove all sulphates. In addition, it creates lime sediment as a secondary waste. Therefore, an inexpensive and environmental-friendly sulphate removal method is needed in addition to precipitation. In this study, carbon residues from a wood gasification process were repurposed as precursors to a suitable sorbent for SO4 2-ion removal. The raw material was modified using ZnCl2, BaCl2, CaCl2, FeCl3, or FeCl2. Carbon residues modified with FeCl3 were selected for further consideration because the removal efficiency toward sulphate was the highest. Batch sorption experiments were performed to evaluate the effects of the initial pH, initial SO4 2-ion concentration, and contact time on sulphate removal. The removal of SO4 2-ions using Fe-modified carbon residue was notably higher compared with unmodified carbon residue and commercially available activated carbon. The sorption data exhibited pseudo-second-order kinetics. The isotherm analysis indicated that the sorption data of Fe-modified carbon residues can be represented by the bi-Langmuir isotherm model.

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Equilibrium studies on the adsorption of Co(II) and Ni(II) by modified silica gels: One-component and binary systems

Cited by 45 publications

References 40 publications

Utilization of industrial waste as a novel adsorbent: Mono/competitive adsorption of chromium(VI) and nickel(II) using diatomite waste modified by EDTA

Utilization of industrial waste as a novel adsorbent: Mono/competitive adsorption of chromium(VI) and nickel(II) using diatomite waste modified by EDTA

Biosorption study of Ni2+ and Cr3+ by Sargassum filipendula: kinetics and equilibrium

Sulphate Removal from Water by Carbon Residue from Biomass Gasification: Effect of Chemical Modification Methods on Sulphate Removal Efficiency

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