Ion exchange in birnessite

Al-Attar, Lina; Dyer, A.

doi:10.2462/09670513.878

Cited by 12 publications

(3 citation statements)

References 27 publications

(19 reference statements)

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“…For synthetic sodium birnessite, the reported CEC value was up to 2.40 meq/g (Golden et al 1986). Sodium ions in birnessite could be fully exchanged with monovalent ions, while partial exchanges could be achieved with Ca and Mg cations (Al-Attar and Dyer 2007).…”

Section: Introductionmentioning

confidence: 96%

Sorption and desorption of tetracycline on layered manganese dioxide birnessite

Jiang

Chang

Wang

et al. 2014

Int. J. Environ. Sci. Technol.

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Birnessite is one of the most common manganese oxides in the clay-sized fraction (\2 lm) of soils and has high cation exchange capacity and larger surface area. Birnessite was previously studied for decomposition of selected antibiotics from water. In this study, the removal of tetracycline (TC) by birnessite from aqueous solution was investigated as a function of initial tetracycline concentration, solution pH, temperature, and equilibrium time. Changes in solid phase after TC adsorption and desorption were characterized by X-ray photoelectron spectroscopy, X-ray diffraction (XRD), and Fourier transform infrared analyses. Desorption of exchangeable cations accompanying TC removal and partial desorption of TC from birnessite by AlCl 3 confirmed that cation exchange was responsible for TC removal at low initial concentrations. Both the external and internal surface areas were readily available for TC uptake by birnessite. The intercalated TC formed a horizontal monolayer configuration in the interlayer of birnessite as deduced from XRD analyses.

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Section: Introductionmentioning

confidence: 96%

Sorption and desorption of tetracycline on layered manganese dioxide birnessite

Jiang

Chang

Wang

et al. 2014

Int. J. Environ. Sci. Technol.

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“…The interlayer cations can be more easily replaced by other inorganic or organic cations based on the electronegative level [12]. The sodium ions in birnessite can be fully exchanged by univalent ions and partly exchanged by calcium and magnesium ions [13]. Some recent studies reported that birnessite was able to promote the decomposition of tetracycline or CIP [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Adsorption Mechanism of Ciprofloxacin from Water by Synthesized Birnessite

Xiao

Feng

et al. 2015

Advances in Materials Science and Engineering

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The efficiency of ciprofloxacin (CIP) adsorption on synthesized birnessite was systematically studied under varying physicochemical conditions, such as solution pH, contact time, initial CIP concentration, and different average oxidation states (AOS) of Mn in birnessite. X-ray diffraction (XRD), Fourier transform infrared (FTIR), and molecular simulations were employed to investigate the adsorption mechanism of CIP on birnessite. Experimental results showed that surface adsorption instead of cation exchange was responsible for the uptake of CIP on birnessite. The quantum mechanics simulation showed that the final energy of the interaction between CIP and birnessite was smaller under the condition when the AOS of Mn was lower, in comparison to the case when the AOS of Mn was high. The highest CIP adsorption occurred under a weak alkaline condition.

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“…According to the Bjerrum theory of ion pairs, lowering the dielectric constant of a solvent increases the forces between ions of opposite charge and therefore favours the formation of their complexes. 34 The dielectric constant of ethanol ( ε r = 25.3) is lower than that of water ( ε r = 80.1). 25 The formation of soluble cuprous chloride complexes was therefore promoted by the ethanolic lixiviant, which can explain the dissolution of copper from SmCo magnet and the overall better dissolution of SmCo magnet by the ethanolic lixiviant over the aqueous lixiviant.…”

Section: Resultsmentioning

confidence: 99%