Removal behavior of hydrous manganese oxide and hydrous stannic oxide for Cs(I) ions from aqueous solutions

Mishra, Shuddhodan P.; Vijaya, Vijaya

doi:10.1016/j.seppur.2006.08.018

Cited by 32 publications

(8 citation statements)

References 40 publications

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“…The positive value of ∆H° shows that the sorption process is endothermic in nature. Such a positive ∆H° value was observed in many works dealing with the adsorption of metallic cations by different mineral sorbents [14,35,38,[40][41][42][43][44]. According to many authors, the endothermicity of the adsorption process, involves not only physical but also chemical interaction between adsorbent and adsorbate [14,35,38].…”

Section: Thermodynamic Parameters Of Adsorptionmentioning

confidence: 66%

Retention of nickel from aqueous solutions using iron oxide and manganese oxide coated sand: kinetic and thermodynamic studies

Boujelben

Bouzid

Elouear

et al. 2010

Environmental Technology

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In this study, the removal of nickel ions from aqueous solutions using iron oxide and manganese oxide coated sand (ICS and MCS) under different experimental conditions was investigated. The effect of metal concentration, contact time, solution pH and temperature on the amount of Ni(II) sorbed was studied and discussed. Langmuir and Freundlich isotherm constants and correlation coefficients for the present systems at different temperatures were calculated and compared. The equilibrium process was well described by the Langmuir isotherm model: the maximum sorption capacities (at 29 K) were 2.73 mg Ni/g and 3.33 mg Ni/g of sorbent for ICS and MCS, respectively. Isotherms were also used to evaluate the thermodynamic parameters (deltaG degrees, deltaH degrees, deltaS degrees) of adsorption. The sorption kinetics were tested for the pseudo-first-order, pseudo-second-order and intra-particle diffusion models. Good correlation coefficients were obtained for the pseudo-second-order kinetic model, showing that the nickel uptake process followed the pseudo-second-order rate expression.

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Section: Thermodynamic Parameters Of Adsorptionmentioning

confidence: 66%

Retention of nickel from aqueous solutions using iron oxide and manganese oxide coated sand: kinetic and thermodynamic studies

Boujelben

Bouzid

Elouear

et al. 2010

Environmental Technology

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“…Removal of cesium from different types of waste streams, using various types of sorbents, such as aluminosilicates, phosphates, ferrocyanides and hydrous oxides of multivalent cations, pillared clays and resorcinol formaldehyde resin, has been previously studied by many researchers. [7][8][9][10][11][12] Transition metal hexacyanoferrates are well known for their high affinity towards cesium in a wide range of pH. 13 These metal hexacyanoferrates are synthesized in granular form, for use in column mode, but are of irregular shape, and have poor mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

Potassium cobalthexacyanoferrate–gel beads for cesium removal: kinetics and sorption studies

et al. 2013

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The hydrogel-sorbent composite beads of potassium cobalthexacyanoferrate (KCoHCF) were synthesized for separation of cesium from waste generated in the nuclear industry. Cross-linked sodium alginate, containing PVA, was used as a binding matrix for the synthesis of spherical beads of 2 mm diameter.The characterization of these beads was carried out, using TGA, SEM and BET surface area analysis techniques, which indicated the highly porous and hydrophilic nature of the beads. The sorption of cesium ions onto these synthesized beads was studied, using a radiotracer technique. To determine equilibrium sorption and kinetic parameters for different initial cesium ion concentrations, all the studies were conducted by a batch method. The experimental data were analyzed, using the different sorption isotherms, and found to be described the best by a Langmuir sorption isotherm. The monolayer capacity of KCoHCF-gel beads is found to be 15 mg g À1 of the dry beads. Sorption kinetics data were analysed, using different kinetic models. The results show that the sorption follows pseudo second-order reaction kinetics. The initial sorption rate and the rate constants for the pseudo first-order, pseudo second-order and intraparticle diffusion were evaluated, and discussed for different initial concentrations in the range 1-20 mg L À1 . The mechanism of the sorption of cesium ions onto the synthesized beads was also investigated and film diffusion was found to be the rate determining step.

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“…In the past decades, several hydrous metal oxides have been exploited for heavy metal removal from aqueous media, namely, hydrous Fe(III) [9,10], Al(III) [10,11], Sn(IV) [9,12], Zr(IV) [13], and Mn(IV) oxides [10,12]. for the sorption by hydrous manganese dioxide (HMO) of cationic or anionic pollutants, i.e., heavy metal ions [14], arsenate [15], and phosphate [16], from natural waters has attracted considerable attention, because it would significantly mediate the fate and mobility of the targeted pollutants in water [17,18].…”

Section: Introductionmentioning

confidence: 99%

Use of hydrous manganese dioxide as a potential sorbent for selective removal of lead, cadmium, and zinc ions from water

Pan

Wan

et al. 2010

Journal of Colloid and Interface Science

174

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Removal behavior of hydrous manganese oxide and hydrous stannic oxide for Cs(I) ions from aqueous solutions

Cited by 32 publications

References 40 publications

Retention of nickel from aqueous solutions using iron oxide and manganese oxide coated sand: kinetic and thermodynamic studies

Retention of nickel from aqueous solutions using iron oxide and manganese oxide coated sand: kinetic and thermodynamic studies

Potassium cobalthexacyanoferrate–gel beads for cesium removal: kinetics and sorption studies

Use of hydrous manganese dioxide as a potential sorbent for selective removal of lead, cadmium, and zinc ions from water

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