Thermodynamics of Fe(II) and Mn(II) adsorption onto bentonite from aqueous solutions

Ullah, Shafqat; Tahir, S.S.

doi:10.1006/jcht.1999.0630

Cited by 42 publications

(13 citation statements)

References 7 publications

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“…The values of H and S in Table 4 were determined from a plot of ln K d vs 1/T. 18,23,52 The adsorption data obtained in the temperature range • C indicate that CP-bentonite has a higher adsorption capacity at higher temperatures. The higher the temperature the higher is the mobility of the anionic dye species, which will increase the number of the dye molecules interacting with the acidic sites on the surface of CP-bentonite via SO 3 − and NH 2 groups.…”

Section: Effect Of Temperature On Adsorptionmentioning

confidence: 99%

Adsorption of Reactive Red 120 from aqueous solutions by cetylpyridinium‐bentonite

Tabak

Baltaş

Afsin

et al. 2010

J of Chemical Tech & Biotech

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Section: Effect Of Temperature On Adsorptionmentioning

confidence: 99%

Adsorption of Reactive Red 120 from aqueous solutions by cetylpyridinium‐bentonite

Tabak

Baltaş

Afsin

et al. 2010

J of Chemical Tech & Biotech

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“…The thermodynamic parameters obtained are listed in (Rauf and Tahir, 2000). The high values of entropy changes suggest that the rate of disorderliness was high in the biosorption process and it further revealed that the rate of biosorption decreased as the temperature increased.…”

Section: Concentration Dynamicsmentioning

confidence: 99%

Removal of Ni (II) and Pb (II) ions from aqueous solutions by grapefruit (Citrus paradisi) Mesocarp Biomass

Obi¹,

Njoku²

2015

Journal of Applied Sciences and Environmental Management

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ABSTRACT:The surface characteristics of Citrus paradisi (grapefruit mesocarp biomass) on the biosorption of Ni (II) and Pb (II) ions from aqueous solution were studied adopting a batch reactor technique. The dried grapefruit mesocarp biomass was characterized using phytochemical screening and Fourier Transform Infra -Red (FTIR) Spectroscopy. The results of the characterization revealed the presence of alkaloids, tannins, saponins, cyanogenic glycosides. Furthermore, the FTIR spectrum pattern of the biomass showed broad and sharp absorption peaks indicating the existence of functional groups like -OH, C=O, C-H, C-O, N-H, etc. The biosorption process was found to be pH, time and concentration dependent. The rate of biosorption was higher in Ni (II) ion than Pb (II) ion. The result of the equilibrium modeling showed that the biosorption process fitted well with the Freundlich isotherm equation indicating a muiltilayer biosorption. The mechanism of the biosorption process followed pseudo -second -order kinetic model equation with correlation coefficient (R 2 ) of 0.999 for Ni (II) ion and 0.991 for Pb (II) ion respectively. Thermodynamic parameters determined showed that the biosorption of Ni (II) and Pb (II) ions on the surface of the biomass was an exothermic and spontaneous process. The rate of biosorption was found to decrease with increasing temperature. The results showed that the dried grapefruit mesocarp biomass was efficient and effective in the biosorption of Ni (II) and Pb (II) ions and is recommended to be applied in wastewaters. © JASEM http://dx.doi.org/10.4314/jasem/v19i3.13 INTRODUCTIONThe degradation of natural waters with several heavy metal contaminants, have been found to be emanating mostly from mining waste and industrial discharges (Baig et al., 1999). These toxic materials cause problems to the entire ecosystem. Although some heavy metals are necessary for the growth of plants, aquatic lives and humans, after certain concentration, it becomes lethal to plants, microorganisms and humans.

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“…It has to be available in tonnage quantities and at economical cost, as chitosan (15). Adsorption can be richly evaluated by thermodynamic data where relevant information on the spontaneity of adsorption processes, as well as on the stability of the adsorbent-adsorbate interactions, can be obtained (16,17). However, data concerning the thermodynamics of the adsorption, in order to supply more information on the interaction of chitosan and dyes, are still lacking in this chitosan field.…”

Section: Introductionmentioning

confidence: 98%

Interaction of Indigo Carmine Dye with Chitosan Evaluated by Adsorption and Thermochemical Data

Anjos

Vieira

Cestari

2002

Journal of Colloid and Interface Science

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Thermodynamics of Fe(II) and Mn(II) adsorption onto bentonite from aqueous solutions

Cited by 42 publications

References 7 publications

Adsorption of Reactive Red 120 from aqueous solutions by cetylpyridinium‐bentonite

Adsorption of Reactive Red 120 from aqueous solutions by cetylpyridinium‐bentonite

Removal of Ni (II) and Pb (II) ions from aqueous solutions by grapefruit (Citrus paradisi) Mesocarp Biomass

Interaction of Indigo Carmine Dye with Chitosan Evaluated by Adsorption and Thermochemical Data

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