Influence of complexing agents on the adsorption of molybdate and nickel ions on alumina

Al-Dalama, Khalida; Aravind, B.; Stanislaus, A.

doi:10.1016/j.apcata.2005.07.041

Cited by 34 publications

(10 citation statements)

References 39 publications

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“…This behavior could be related with the species on surface of supports, this species could change with the adsorption conditions, especially the pH. These results are in agreement with the findings of Luthra & Cheng (1987), Hall & Wang (1982) and Al-Dalama et al (2005).…”

Section: -supporting

confidence: 91%

Descripción teórica y experimental del equilibrio de adsorción de soluciones iónicas en la superficie de los sistemas γ-Al2O3 y MoO3/γ-Al2O3

Martínez¹,

Fierro²

2011

inycomp

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Se estudiaron las isotermas de adsorción en equilibrio de iones Mo, Co y Pt sobre γ-Al2O3 y iones Co y Pt sobre MoO3/γ-Al2O3. Los catalizadores molibdeno alúmina para los ensayos de adsorción fueron preparados por impregnación de los soportes de alúmina con heptamolibdato de amonio. Los datos de equilibrio de adsorción fueron obtenidos a partir del proceso de adsorción liquido-sólido. Las curvas de adsorción fueron tipo L para los sistemas Mo y Co sobre γ-Al2O3 y Co(Pt) sobre MoO3/γ-Al2O3, mientras para el sistema Pt(Co) sobre MoO3/-Al2O3 fueron tipo S. Para el caso del molibdeno, se encontró que las especies en solución (tetraédricas y octaédricas) afectan la adsorción del molibdeno. La adsorción de iones Co(II) sobre alúmina o alúmina modificada no depende de la alúmina utilizada. La forma de las isotermas de adsorción de iones Co sobre MoO3/γ-Al2O3 parece ser modificada cuando los iones Pt(IV) están presentes simultáneamente. Los procesos de adsorción de especies de Pt dependen de la presencia de Mo(VI) y Co(II) en la superficie de los soportes. Se observó que la cantidad de Pt adsorbido sobre MoO3/γ-Al2O3 disminuye en presencia de iones Co(II) en solución. Finalmente, se calcularon los parámetros de adsorción en equilibrio de los sistemas Mo(VI) and Co(II) sobre γ-Al2O3 and Co(II) y/o Pt(IV) sobre MoO3/γ-Al2O3.

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Section: -supporting

confidence: 91%

Descripción teórica y experimental del equilibrio de adsorción de soluciones iónicas en la superficie de los sistemas γ-Al2O3 y MoO3/γ-Al2O3

Martínez¹,

Fierro²

2011

inycomp

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“…These metal cations are impregnated onto metal oxide support via drying and calcination steps, resulting in poor metal dispersion on the support due to severe aggregation of metal species. It is interesting to note that some researches, in which metal species were introduced onto metal oxide support by means of a chelating agent such as ethylenediaminetetraacetic acid (EDTA), have been attempted to enhance metal dispersion on the support [35][36][37]. To our best knowledge, however, no research has been made on the direct impregnation of chelated nickel species onto positively-charged mesoporous alumina support.…”

Section: Introductionmentioning

confidence: 97%

“…To our best knowledge, however, no research has been made on the direct impregnation of chelated nickel species onto positively-charged mesoporous alumina support. Only a few investigations such as metal loading on metal oxide by chelation [35], impregnation of metal ions onto EDTA-bound alumina support [36], and addition of chelated metal anions into hydrotalcite structure [37] were carried out so far. Therefore, an investigation on the mesoporous Ni/Al 2 O 3 steam reforming catalyst prepared by introducing chelated nickel species onto positively-charged mesoporous alumina support would be worthwhile.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen production by steam reforming of liquefied natural gas (LNG) over mesoporous Ni/Al2O3 catalyst prepared by an EDTA-assisted impregnation method

Bang

Park

Han

et al. 2016

Applied Catalysis B: Environmental

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“…26,27 The obtained values of ΔS were -7.81 and -2.12 J mol -1 K -1 for Cd(II) and Pb(II), respectively. The negative values of ΔG imply that the sorption of these metal ions on the organo-bentonite is spontaneous and becomes more favorable with decreasing temperature.…”

Section: Effect Of Temperature and Thermodynamic Parametersmentioning

confidence: 89%

Sorption performance of cysteine-modified bentonite in heavy metals uptake

Faghihian

Nejati-Yazdinejad

2009

J Serb Chem Soc

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A local clay, bentonite (N-Ben), was modified by the biologically--based ligand, cysteine (Cys), through a simple sorption technique. The modified sorbent (Cys-Ben) demonstrated affinity for soft and moderately soft heavy metal ions (HMI), such as Cd(II) and Pb(II), probably as a result of the soft basic character of the thiol ligand side chains. The resulting modified system was effective for metal binding with capacities of 0.503 and 0.525 mmol g -1 , for Pb(II) and Cd(II), respectively. Comparative batch experiments were performed for removing lead and cadmium from aqueous solutions. The sorption parameters were derived from a Langmuir fit to the sorption isotherms of the studied ions. The study showed that the sorption capacity of Cys-Ben was higher than that of N-Ben for these ions. The effect of pH was examined over the range 2.0-6.0. The sorption capacities of Cys-Ben showed that this modified clay is a good sorbent for the examined heavy metal ions.

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Influence of complexing agents on the adsorption of molybdate and nickel ions on alumina

Cited by 34 publications

References 39 publications

Descripción teórica y experimental del equilibrio de adsorción de soluciones iónicas en la superficie de los sistemas γ-Al2O3 y MoO3/γ-Al2O3

Descripción teórica y experimental del equilibrio de adsorción de soluciones iónicas en la superficie de los sistemas γ-Al2O3 y MoO3/γ-Al2O3

Hydrogen production by steam reforming of liquefied natural gas (LNG) over mesoporous Ni/Al2O3 catalyst prepared by an EDTA-assisted impregnation method

Sorption performance of cysteine-modified bentonite in heavy metals uptake

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