On the adsorption properties of carbon adsorbents Communication 6. Investigation of the equilibrium adsorption of vapors within a broad range of temperatures on activated charcoals with various microporous structures

The new adsorption material was prepared by grafting the larch tannin onto aminated silica beads with the glutaraldehyde as the cross-linking agent. The adsorption properties of Pr3+and Nd3+on the new adsorbent material in aqueous solution were investigated. The results showed that the equilibrium adsorption capacities of this adsorbent to Pr3+, Nd3+were 402.12mg/g, 305.43mg/g at 303K when the initial concentrations of each ions were 442.7mg/L, 432.6mg/L, respectively and the pH value was 5.5; the maximum adsorption quantities of each ions were 576.34mg/g, 497.02mg/g at 303K when the initial concentrations of each ions were 704.5mg/L, 721.0mg/L, respectively and the pH value was 5.5. The effect of pH value was significant to the equilibrium adsorption capacity, the optimum pH values of this material to Pr3+and Nd3+were both 5.5; while the effect of the temperature was not obvious to the equilibrium adsorption capacity. The adsorption thermodynamics meet Freundlich equation, and the adsorption kinetics data of this adsorbent to Pr3+, Nd3+fitted with the pseudo-second-order rate equation dynamics model.

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Adsorption of nucleic acid bases on magnesium oxide (MgO)

International Journal of Astrobiology ◽

10.1017/s1473550412000444 ◽

2012 ◽

Vol 12 (1) ◽

pp. 78-86 ◽

Cited By ~ 19

Author(s):

Teresa Fornaro ◽

John Robert Brucato ◽

Sergio Branciamore ◽

Amaranta Pucci

Keyword(s):

Nucleic Acid ◽

Metal Oxides ◽

Magnesium Oxide ◽

Organic Molecules ◽

Adsorption Properties ◽

Equilibrium Adsorption ◽

Nucleic Acid Bases ◽

Adsorption Of Organic Molecules ◽

Emergence Of Life

AbstractThe adsorption of organic molecules on mineral matrices might have played a fundamental role in processes that led to the emergence of life. We investigated the adsorption properties of the nucleobases adenine, cytosine, uracil and hypoxanthine on magnesium oxide (MgO), determining the single solute batch equilibrium adsorption isotherms. Langmuir-type isotherms were fitted to data, assuming a rapid reversible equilibration of adsorption, demonstrated effectively through desorption experiments. The Langmuir equilibrium adsorption constantKand the amount of the solute per unit of adsorbent mass necessary to complete the monolayerbwere calculated. The results indicate that MgO is a good adsorbent for nucleobases (adenine > uracil > hypoxantine > cytosine), suggesting a role of metal oxides in concentrating biomolecules in prebiotic conditions that might have favoured the passage from geochemistry to biochemistry.

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Elution Adsorption Dynamics of Organic Substances on Carbon Adsorbents

Adsorption Science & Technology ◽

10.1177/0263617499010001-416 ◽

1993 ◽

Vol 10 (1-4) ◽

pp. 173-179 ◽

Cited By ~ 10

Author(s):

N.S. Polyakov ◽

A.V. Larin ◽

M.L. Goubkina

Keyword(s):

Experimental Data ◽

Carbon Black ◽

Breakthrough Curves ◽

Equilibrium Adsorption ◽

Carbon Adsorbents ◽

Organic Substances ◽

Adsorption Dynamic ◽

Adsorption Dynamics ◽

Elution Adsorption Dynamics ◽

Theoretical Results

Breakthrough curves of CF3Cl on carbon black and of cyclo-hexane on active charcoal have been measured under elution adsorption dynamic conditions. For linear and non-linear adsorption dynamic modes, the experimental data and theoretical results calculated according to the layer of equilibrium adsorption (LEA) model closely coincide.

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