Heavy metal-adsorption on micas and clay minerals studied by X-ray photoelectron spectroscopy

Gier, Susanne

doi:10.1016/s0169-1317(00)00004-1

Cited by 106 publications

(52 citation statements)

References 4 publications

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“…Several authors [9,29,30,46,47] also found that Palabora vermiculite has, comparatively, an unusually high level of iron. These iron ions (and also aluminium ions) are the main isomorphous substitutes for magnesium in the octahedral sites and also as considerable silica replacements in the tetrahedral sites [46].…”

Section: Resultsmentioning

confidence: 99%

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Ion Exchanged Vermiculites with Lower Expansion Onset Temperatures

Muiambo

Focke

2012

Molecular Crystals and Liquid Crystals

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South African Palabora vermiculite was modified by ion exchange with ammonium and selected alkali metal and alkaline earth metal ions. In the exchanged vermiculite with ammonium ions, it was found that ammonia and water were the blowing agents and they were simultaneously released during thermal degradation. In the increasing ionic potential series: Na, Ba, Ca and Mg, it was found that the onset expansion temperature also increased dramatically. Exchange with relatively low ionic potential species, namely sodium, potassium and ammonium, lowered the exfoliation onset temperature of vermiculite to below 300 °C.Keywords: Vermiculite; Ion exchange; Exfoliation; Interstratification; Thermal Analysis.

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Section: Resultsmentioning

confidence: 99%

“…As a result they are able to create a richer interlayer hydration and consequent better enlargement of the interlayer space [28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Ion Exchanged Vermiculites with Lower Expansion Onset Temperatures

Muiambo

Focke

2012

Molecular Crystals and Liquid Crystals

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“…In metal sorption by clays, the properties of metal ions (charge, ionic radius, ionic potential) as well as charge characteristics of the clay, are factors which influence selectivity of adsorption. 58 It has been also shown that Cu 2þ and Zn 2þ are adsorbed as monovalent ions, presumably as (CuOH) þ and (ZnOH) þ hydroxy surface-complexes. 58 Clay minerals have a vastly greater surface area than the fungal biomass.…”

Section: Discussionmentioning

confidence: 99%

Metal sorption by biomass of melanin‐producing fungi grown in clay‐containing medium

Fomina

Gadd

2002

J of Chemical Tech & Biotech

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The sorption of toxic metals by fungal mycelia grown in clay-containing medium is reported in this work. Biomass of melanin-producing microfungi of the genus Cladosporium (C cladosporioides, C resinae and C herbarum) and Aureobasidium pullulans, clay minerals and fungal mycelia grown in clay-containing medium were compared for their equilibrium Cu and Cd uptake from pHbuffered solutions using experimental sorption isotherms. Bentonite (Cherkassy) in the natural form was shown to be the best Cu sorbent compared with the other clays and clay minerals tested. Cu sorption isotherms fitted the Langmuir sorption model for all cases. Comparison of Cu and Cd uptake for biomass and bentonite showed a lower biomass uptake capacity but a considerably higher affinity of the biosorbent for the solute. The presence of kaolinite and palygorskite in the medium generally reduced both Cu and Cd sorption capacity and the metal-binding ability of the fungal-clay mixtures. In contrast, addition of bentonite into the medium did not appreciably alter the Cd sorption ability but increased the sorption of Cu by A pullulans and C cladosporioides grown in this medium. A common feature for all fungi grown in the presence of bentonite was an increase in the Cu sorption capacity (Q max ) of the biomineral sorbents and a reduction in their affinity (Langmuir parameter b) compared with control biomass. A difference between predicted and experimental data obtained for biomass grown on bentonite medium was also observed. The connection between the sorption capacity of biomass grown in clay-containing medium, mycelial morphology and the structure of fungal pellets is discussed and a mechanism for the changed sorption capacity of the combined biomineral sorbents is proposed which involves blocking or modification of binding sites on biotic and abiotic components of the 'biomineral' association.

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“…There are several different types of adsorbents currently being used and proposed for adsorption of heavy metals ions such as clays, ion-exchange resins and activated carbon. However, these adsorbents have shown several disadvantages like poor mechanical stability, low thermal stability as well as low adsorption capacities and poor selectivity [9][10][11]. Recently, organic-inorganic hybrid materials have emerged as promising adsorbents for heavy metals overcoming the limitations of current adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Iridium Organometallic Complexes Covalently Grafted to Mesoporous Silicates and their Application on Removal of Heavy Metal Ions from Aqueous Solution

Ahmed¹

2017

Nano Res Appl

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In the present paper, a cyclometalated thiolated bridged iridium dimmerswhere L is a bidentate cyclometalated ligand, 2,5-di(thiophen-2-yl) pyridine (dtp) (1) and 2-benzo [4,5] thienyl pyridine (btp) (2) were covalently bonded into silicate framework by hydrolysis and condensation reaction. The new nanohybrid materials were fully characterized by Fourier trans-form infrared spectroscopy (FTIR), X-ray diffractometer (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The results confirmed successful doping of the silicates with phosphorescent iridium organometallic complex. The TEM studies have suggested the nanoparticles nature. The prepared nanohybrids were found to be effective adsorbent for the removal of metal ions such as chromium (Cr

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Heavy metal-adsorption on micas and clay minerals studied by X-ray photoelectron spectroscopy

Cited by 106 publications

References 4 publications

Ion Exchanged Vermiculites with Lower Expansion Onset Temperatures

Ion Exchanged Vermiculites with Lower Expansion Onset Temperatures

Metal sorption by biomass of melanin‐producing fungi grown in clay‐containing medium

Synthesis and Characterization of Iridium Organometallic Complexes Covalently Grafted to Mesoporous Silicates and their Application on Removal of Heavy Metal Ions from Aqueous Solution

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