Kinetics, adsorption and desorption of Cd(II) and Cu(II) on natural allophane: Effect of iron oxide coating

Silva-Yumi, Jorge; Escudey, Mauricio; Gacitúa, Manuel; Pizarro, Carmen

doi:10.1016/j.geoderma.2017.12.038

Cited by 41 publications

(32 citation statements)

References 40 publications

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“…For example, the occurrence of a large amount of Fe‐rich allophane in soils was considered to increase the amount of active groups on the soil particle surface, promoting the formation of highly stable mineral‐organic complexes in soils (Filimonova et al., 2016). In addition, even iron (oxyhydr)oxide coatings on the particles or microaggregates of allophane result in changes in the properties of these particles (Silva‐Yumi et al., 2018). Therefore, the environmental Fe concentration is a key factor that controls the formation and evolution of allophane and thus has an important influence on the migration and cycle of matter in Al‐Si‐Fe systems.…”

Section: Discussionmentioning

confidence: 99%

Effects of Environmental Fe Concentrations on Formation and Evolution of Allophane in Al‐Si‐Fe Systems: Implications for Both Earth and Mars

Yuan

Liu

et al. 2020

JGR Planets

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Identifying the mineralogy on the surface of Mars helps to deduce the formation and evolution of sediments and the possible paleoenvironments involved (e.g., Bishop et al., 2018; Fraeman et al., 2013). At present, based on the visible and near-infrared (VNIR) spectroscopic data collected by the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) onboard the Mars Reconnaissance Orbiter and Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité (OMEGA) onboard the Mars Express orbiter, the global mineralogy on Mars, including mainly the distribution of phyllosilicate (Poulet et al., 2005) and hydrated sulfates (Gendrin et al., 2005), has been recorded. Analyses of these data suggest that distinct aqueous geochemical environments existed on Mars, including warm surface waters (Bishop & Rampe, 2016), subsurface hydrothermal systems (Ehlmann et al., 2011) and hot springs (Al-Samir et al., 2017). For instance, the phyllosilicate outcrops on the surface of Mars mainly include Fe-Mg smectite (Ehlmann & Edwards, 2014); on the basis of the fact that smectite minerals typically occurs in surficial soils or sediments on Earth (Chamley, 1989), these outcrops might have formed in warm waters (25°C-50°C) on early Mars. Apart from the above mentioned well-crystallized minerals, data from both orbital spectroscopy and in situ rover investigations suggest the wide distribution of poorly crystallized and amorphous hydrated minerals on the surface of Mars, such as opal-A, allophane, and ferrihydrite (e.g., Rampe et al., 2012; Vaniman et al., 2014). Among them, allophane and allophane-like materials are considered to be common Abstract Allophane, a common component on Earth and a probable constituent of the amorphous component on Mars, is closely associated with Fe in the form of structural Fe and/or iron (oxyhydr)oxide coatings. However, until now, the formation and evolution of allophane as products of environmental Fe concentrations have rarely been studied. We investigated allophane precipitation from gels with different Fe/(Fe + Al) molar ratios (n, 0 ≤ n ≤ 1.0). X-ray diffraction patterns and Fourier transform infrared spectra of the products showed that allophane was nearly the only product at n ≤ 0.2 and that the crystallinity of Fe-rich allophane decreased with increasing n. Combined with the results of transmission electron microscopy and Mössbauer spectroscopy, Fe was found to be mainly incorporated into the gibbsite-like sheet of allophane, forming clusters; the highest Fe-for-Al substitution content was roughly estimated to be 20 mol.%. As n increased further, the formation of allophane was increasingly suppressed, and the Fe phases began to separate from the Al-Si phases, resulting in mixtures of incipient allophane and incipient akaganeite and finally akaganeite. The near-infrared spectroscopic data (1.2-2.6 μm) of the products showed incapability in identifying poorly ordered minerals in Al-Si-Fe systems, while the features in the range of 0.4-1.2 μm were powerful for studying iron occurrence in t...

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Section: Discussionmentioning

confidence: 99%

Effects of Environmental Fe Concentrations on Formation and Evolution of Allophane in Al‐Si‐Fe Systems: Implications for Both Earth and Mars

Yuan

Liu

et al. 2020

JGR Planets

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“…Various techniques have been used for removal of toxic metals in WWTPs, such as chemical precipitation, flocculation and coagulation, oxidation/reduction, and nanofiltration (Mosa et al, 2016;Purkayastha et al, 2014;Teodoro et al, 2016). Adsorption may be used as a treatment or as a polishing technique in WWTPs, offering high efficiency and flexibility of operation (Li et al, 2018;Silva-Yumi et al, 2018;Xin et al, 2017). As a polishing technique, adsorption can be used to achieve drinking water standards.…”

Section: Introductionmentioning

confidence: 99%

Application of pyridine-modified chitosan derivative for simultaneous adsorption of Cu(II) and oxyanions of Cr(VI) from aqueous solution

Gonçalves

Gurgel

Soares

et al. 2021

Journal of Environmental Management

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…In addition, factors like soil pH, dissolved organic matter, ionic strength or the nature and number of different metals present also influence the extent of the adsorption capacity of soils [5,[8][9][10][11][12]. The mineral and organic colloidal particles of the solid phase are the most active soil components in the adsorption processes [3,5,[13][14][15][16] nevertheless, their high heterogeneity and variability among soils makes their exact role during heavy metal adsorption remains not clearly understood.…”

Section: Introductionmentioning

confidence: 99%

Specific Adsorption of Heavy Metals in Soils: Individual and Competitive Experiments

et al. 2020

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The partitioning between the soil solid phase and the soil solution determines the mobility of pollutants like heavy metals. If nonspecific sorption takes place, the reactions are easily reversible and heavy metals are released to soil solution increasing the probability of leaching through soil profile. Mobility and leaching are also favoured if other metals are in the system and competition for specific adsorption sites takes place. In this study, desorption equilibrium experiments were conducted after adsorption ones. The specific adsorption was evaluated through the amounts of the still adsorbed Cu, Pb, Cr, Ni and Zn after desorption experiments in ten different soils. In addition, competition adsorption and desorption binary experiments were conducted for evaluating the metal competition in three of the soils. Pb and Cu are the metals adsorbed and retained in higher amounts in all the studied soils. In slightly neutral soils, Cr is retained in lesser amounts while in acidic soils Zn is the metal less retained. Results showed that despite the high and variable amounts of organic matter in the soils, soil pH is the most important variable in neutral soils. In acidic soils, soil properties different than pH play important roles and specific sorption of Pb is related to the cationic exchange capacity of the soils while that of Zn to the clay content. Instead, the release of Cu during desorption experiments is probably due to the more soluble organic fraction of the soils. The individual retention of Cu, Zn, Ni and Pb is higher than when they are in competition, except if Cr is present. In this case, the amount of those four metals and that of Cr increased. Therefore, the presence of Cr together with cationic heavy metals favoured the adsorption of those metals in multi-metal polluted areas. Specific adsorption is also important during competition as soil affinities increase during competition experiments.

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Kinetics, adsorption and desorption of Cd(II) and Cu(II) on natural allophane: Effect of iron oxide coating

Cited by 41 publications

References 40 publications

Effects of Environmental Fe Concentrations on Formation and Evolution of Allophane in Al‐Si‐Fe Systems: Implications for Both Earth and Mars

Effects of Environmental Fe Concentrations on Formation and Evolution of Allophane in Al‐Si‐Fe Systems: Implications for Both Earth and Mars

Application of pyridine-modified chitosan derivative for simultaneous adsorption of Cu(II) and oxyanions of Cr(VI) from aqueous solution

Specific Adsorption of Heavy Metals in Soils: Individual and Competitive Experiments

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