Surface diffusion in monomolecular films

Agrawal, M. L.; Neuman, Ronald D.

doi:10.1016/0021-9797(88)90439-0

Cited by 22 publications

(17 citation statements)

References 21 publications

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“…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]. Chemical bonding between metal cations and the mineral sorbent surfaces was confirmed by the Table 3.…”

Section: Thermodynamic Parameters Of Adsorptionsupporting

confidence: 68%

“…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: 80%

“…The values of sorption constants, derived from the Freundlich model (Tables 1 and 2), show that the K F constant -which is a measure of sorption capacity [38] -remains higher for MCS than for ICS. Values obtained of 1<n<10 imply favourable sorption of nickel on the two sorbents.…”

Section: Sorption Isothermmentioning

confidence: 98%

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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 Adsorptionsupporting

confidence: 68%

Section: Thermodynamic Parameters Of Adsorptionmentioning

confidence: 80%

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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

View full text Add to dashboard Cite

show abstract

“…The value of D G is, however, approximate. From the results reported by Agrawal and Neuman (1988), it is evident that D G depends significantly on the state of the monolayer (i.e., gaseous, liquid expanded or liquid compressed states). In a multi-ion aqueous electrolytic solution, the speed of movement of an ion affects the movement of other ions for maintaining the electrical neutrality (Vinograd and McBain, 1941).…”

Section: Coalescence Of Cyclohexane Drops At Flat Water à Cyclohexanementioning

confidence: 93%

“…D G is the mean surface diffusivity of the surfactant molecules. The value of D G for many surfactants has been given by Agrawal and Neuman (1988). The radius of the barrier ring, R b , can be estimated from the equation given by Princen (1963) …”

Section: Coalescence Of Drops At Flat Liquid à Liquid Interfacementioning

confidence: 99%