Adsorption of Co2+ and Zn2+ ions on hydrous Fe(III), Sn(IV) and mixed Fe(III)/Sn(IV) oxides Part I. Characteristics of the hydrous oxides, apparent capacity and some equilibria measurements

Ghoneimy, Hussein F.; Morcos, Tyser N.; Misak, Nasr Z.

doi:10.1016/s0927-7757(96)03854-x

Cited by 9 publications

(4 citation statements)

References 36 publications

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“…The ion-exchange capacity of Co 2+ on R-F and ZMPP is higher than the ion-exchange capacity of Co 2+ on chromium titanate (CrTi), cerium titanate (CeTi) [19] and hydrous iron(III) oxide (HFO) [20]. …”

Section: Capacity Measurementsmentioning

confidence: 99%

Selectivity of cesium from fission radionuclides using resorcinol–formaldehyde and zirconyl-molybdopyrophosphate as ion-exchangers

Shady

2009

Journal of Hazardous Materials

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Section: Capacity Measurementsmentioning

confidence: 99%

Selectivity of cesium from fission radionuclides using resorcinol–formaldehyde and zirconyl-molybdopyrophosphate as ion-exchangers

Shady

2009

Journal of Hazardous Materials

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“…The pH ranges from 3.3-5.8 and 2.4-6.5 for Giftkies and Kaňk, respectively (Drahota et al, 2018;Filippi et al, 2015;Kocourková-Víšková et al, 2015), whereas the PZC of SnO 2 and hydrous stannates is 3.9-5.5 (Kosmulski, 2009b). Ghoneimy et al (1997) investigated the PZC of synthetic hydrous stannic oxide, mixed hydrous ferric / stannic oxide, and HFO and obtained a PZC of 4.4, 6.2, and 6.8, respectively. This suggests a lower PZC of Sn-containing Fe precipitates, and a PZC of SFA was assumed to be in the range of PZC SnO 2 and PZC HFO at studied sites.…”

Section: Initial Weathering: Adsorption On Secondary Precipitatesmentioning

confidence: 99%

Weathering of stannite–kësterite [Cu₂(Fe,Zn)SnS₄] and the environmental mobility of the released elements

Haase

Kiefer²,

Pollok³

et al. 2022

Eur. J. Mineral.

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Abstract. The sulfidic waste dumps of the historical mining sites Giftkies and Kaňk (Czech Republic) have been exposed to a temperate climate over decades. This exposure generated low-pH conditions caused by metal sulfide decomposition. Tin sulfides of the stannite–kësterite series [Cu2(Fe,Zn)SnS4] are common Sn minerals in the ores at the investigated sites. They decompose under acidic and oxidizing conditions and form in situ secondary precipitates. Compositional analyses of primary and secondary minerals were collected by electron microprobe to track the environmental mobility of the released elements during weathering. Transmission electron microscopy revealed a diffusion-driven alteration of stannite to Sn-rich chalcopyrite and the precipitation of native copper and silver from stannite. In assemblages containing arsenopyrite, an in situ and amorphous Sn–Fe–As (SFA)-rich phase precipitated close to the Sn sulfide. The SFA precipitate contains very little sulfur, which was probably released to the aqueous phase as oxidized species, whereas small amounts of Cu and Zn were captured by the SFA. This precipitate is metastable and acts as a temporaneous sink for mobile elements (Cu, Zn) and elements derived from acid-soluble silicates and phosphates (Ca, Si, Al, and P). With advanced weathering, complex redox reactions result in the precipitation of magnetite as an oxidation product of the sulfidic material under oxidative conditions. The stable minerals goethite and cassiterite mark the end of the weathering sequence and crystallized from the amorphous SFA precipitate.

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“…To gather the advantages of ferrite and magnetite, a stoichiometric amount of 0.25 M NH 4 OH was added to 0.25 M FeCl 3 (Ghoniemy et al 1997). After settling over-night, the solid product was repeatedly washed with water by decantation over one day.…”

Section: Hfomentioning

confidence: 99%

“…Iron oxides in various forms have been used for treatment of radioactive and heavy metals from water and wastewater solutions (Misak et al 1996;Ghoniemy et al 1999Ghoniemy et al , 1997Morcos et al 2003). For example iron ferrite supported and used in a column mode in the presence of an external magnetic field has an enhanced capacity removal of contaminants in various forms from water.…”

Section: Introductionmentioning

confidence: 99%

Development and optimization of magnetic technologies based processes for removal of some toxic heavy metals

2007

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In the developing countries where the cost is often a decisive factor, extensive studies were undertaken to test the most effective factors on the preparation, optimization and validation of the magnetic particles (or, more accurately, magnetizable particles) for removal of heavy metals from wastewaters. The objective of the proposed work was focused to provide promising solid-phase materials, which, are relatively in expensive and combine high surface capacity with fast efficient treatment. Four various metal oxides including hydrous ferric oxide (HFO), hydrous stannic oxide (HSO) and mixed ferric/stannic oxide (HMO), were prepared by precipitation with ammonia from metal chloride solutions. Two mixed oxides were prepared with different Sn/Fe ratios of 50% and 20%. Optimal conditions for the activation of these particles and the subsequent mixing of various metals oxides are tested together with the utility of the method to get a new composite material with developed chemical characteristics over their individual metal oxides. Factors affecting the sorption behavior of the prepared samples in basic and acid media were elucidated. The magnetic treatment procedure using the mixed oxide (50%) enables the equilibration step to be carried out rapidly mainly due to ferric oxide during the magnetization process and efficiently due to high capacity of the stannic oxide. A key factor in achieving very high uptake percentage is the reduction of non-specific binding of various heavy metals to the solid phase support. This is usually achieved by increasing the ion exchange capability, in addition to their adsorption process.

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Adsorption of Co2+ and Zn2+ ions on hydrous Fe(III), Sn(IV) and mixed Fe(III)/Sn(IV) oxides Part I. Characteristics of the hydrous oxides, apparent capacity and some equilibria measurements

Cited by 9 publications

References 36 publications

Selectivity of cesium from fission radionuclides using resorcinol–formaldehyde and zirconyl-molybdopyrophosphate as ion-exchangers

Selectivity of cesium from fission radionuclides using resorcinol–formaldehyde and zirconyl-molybdopyrophosphate as ion-exchangers

Weathering of stannite–kësterite [Cu₂(Fe,Zn)SnS₄] and the environmental mobility of the released elements

Development and optimization of magnetic technologies based processes for removal of some toxic heavy metals

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Adsorption of Co2+ and Zn2+ ions on hydrous Fe(III), Sn(IV) and mixed Fe(III)/Sn(IV) oxides Part I. Characteristics of the hydrous oxides, apparent capacity and some equilibria measurements

Cited by 9 publications

References 36 publications

Selectivity of cesium from fission radionuclides using resorcinol–formaldehyde and zirconyl-molybdopyrophosphate as ion-exchangers

Selectivity of cesium from fission radionuclides using resorcinol–formaldehyde and zirconyl-molybdopyrophosphate as ion-exchangers

Weathering of stannite–kësterite [Cu2(Fe,Zn)SnS4] and the environmental mobility of the released elements

Development and optimization of magnetic technologies based processes for removal of some toxic heavy metals

Contact Info

Product

Resources

About

Weathering of stannite–kësterite [Cu₂(Fe,Zn)SnS₄] and the environmental mobility of the released elements