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Kinetics and Thermodynamics of Reserpine Adsorption onto Strong Acidic Cationic Exchange Fiber.

Guo Z, Liu X, Huang H - PLoS ONE (2015)

Bottom Line: The equilibrium was attained within 20 mins.The calculated activation energy Ea was 4.35 kJ/mol.And the thermodynamic parameters were: 4.97<ΔH<7.44 kJ/mol, -15.29<ΔG<-11.87 kJ/mol and 41.97<ΔS<47.35 J/mol·K.

View Article: PubMed Central - PubMed

Affiliation: College of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi, PR China; Key laboratory of generic technology research and development of traditional Chinese medicine preparation in Guangxi colleges and universities, College of Pharmacy, Guangxi University of Chinese Medicine, Nanning, Guangxi, PR China.

ABSTRACT
The kinetics and thermodynamics of the adsorption process of reserpine adsorbed onto the strong acidic cationic exchange fiber (SACEF) were studied by batch adsorption experiments. The adsorption capacity strongly depended on pH values, and the optimum reserpine adsorption onto the SACEF occurred at pH = 5 of reserpine solution. With the increase of temperature and initial concentration, the adsorption capacity increased. The equilibrium was attained within 20 mins. The adsorption process could be better described by the pseudo-second-order model and the Freundlich isotherm model. The calculated activation energy Ea was 4.35 kJ/mol. And the thermodynamic parameters were: 4.97<ΔH<7.44 kJ/mol, -15.29<ΔG<-11.87 kJ/mol and 41.97<ΔS<47.35 J/mol·K. The thermodynamic parameters demonstrated that the adsorption was an endothermic, spontaneous and feasible process of physisorption within the temperature range between 283 K and 323 K and the initial concentration range between 100 mg/L and 300 mg/L. All the results showed that the SACEF had a good adsorption performance for the adsorption of reserpine from alcoholic solution.

No MeSH data available.


The Langmuir, Freundlich, D-R and Temkin adsorption isotherms from 283 to 323 K.(a) Langmuir isotherm;(b) Freundlich isotherm;(c) D-R isotherm;(d) Temkin isotherm.
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pone.0138619.g007: The Langmuir, Freundlich, D-R and Temkin adsorption isotherms from 283 to 323 K.(a) Langmuir isotherm;(b) Freundlich isotherm;(c) D-R isotherm;(d) Temkin isotherm.

Mentions: The Langmuir isotherm model describes monolayer adsorption onto homogeneous surface with no interaction between adjacent adsorbed molecules. The linear form of Langmuir isotherm model is as following [38]:1qe=1qmkLce+1qm(9)Where qe is the equilibrium adsorption capacity, mg/g; ce is the equilibrium concentration of reserpine in solution, mg/L; kL is the Langmuir constant, L/mg, which is related to the affinity of binding sites; and qm is the theoretical saturation capacity of the monolayer, mg/g. The values of qm and kL were derived from the intercept and slope of the linear plot of 1/qe versus 1/ce shown in Fig 7a and listed in Table 2.


Kinetics and Thermodynamics of Reserpine Adsorption onto Strong Acidic Cationic Exchange Fiber.

Guo Z, Liu X, Huang H - PLoS ONE (2015)

The Langmuir, Freundlich, D-R and Temkin adsorption isotherms from 283 to 323 K.(a) Langmuir isotherm;(b) Freundlich isotherm;(c) D-R isotherm;(d) Temkin isotherm.
© Copyright Policy
Related In: Results  -  Collection

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Show All Figures
getmorefigures.php?uid=PMC4589353&req=5

pone.0138619.g007: The Langmuir, Freundlich, D-R and Temkin adsorption isotherms from 283 to 323 K.(a) Langmuir isotherm;(b) Freundlich isotherm;(c) D-R isotherm;(d) Temkin isotherm.
Mentions: The Langmuir isotherm model describes monolayer adsorption onto homogeneous surface with no interaction between adjacent adsorbed molecules. The linear form of Langmuir isotherm model is as following [38]:1qe=1qmkLce+1qm(9)Where qe is the equilibrium adsorption capacity, mg/g; ce is the equilibrium concentration of reserpine in solution, mg/L; kL is the Langmuir constant, L/mg, which is related to the affinity of binding sites; and qm is the theoretical saturation capacity of the monolayer, mg/g. The values of qm and kL were derived from the intercept and slope of the linear plot of 1/qe versus 1/ce shown in Fig 7a and listed in Table 2.

Bottom Line: The equilibrium was attained within 20 mins.The calculated activation energy Ea was 4.35 kJ/mol.And the thermodynamic parameters were: 4.97<ΔH<7.44 kJ/mol, -15.29<ΔG<-11.87 kJ/mol and 41.97<ΔS<47.35 J/mol·K.

View Article: PubMed Central - PubMed

Affiliation: College of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi, PR China; Key laboratory of generic technology research and development of traditional Chinese medicine preparation in Guangxi colleges and universities, College of Pharmacy, Guangxi University of Chinese Medicine, Nanning, Guangxi, PR China.

ABSTRACT
The kinetics and thermodynamics of the adsorption process of reserpine adsorbed onto the strong acidic cationic exchange fiber (SACEF) were studied by batch adsorption experiments. The adsorption capacity strongly depended on pH values, and the optimum reserpine adsorption onto the SACEF occurred at pH = 5 of reserpine solution. With the increase of temperature and initial concentration, the adsorption capacity increased. The equilibrium was attained within 20 mins. The adsorption process could be better described by the pseudo-second-order model and the Freundlich isotherm model. The calculated activation energy Ea was 4.35 kJ/mol. And the thermodynamic parameters were: 4.97<ΔH<7.44 kJ/mol, -15.29<ΔG<-11.87 kJ/mol and 41.97<ΔS<47.35 J/mol·K. The thermodynamic parameters demonstrated that the adsorption was an endothermic, spontaneous and feasible process of physisorption within the temperature range between 283 K and 323 K and the initial concentration range between 100 mg/L and 300 mg/L. All the results showed that the SACEF had a good adsorption performance for the adsorption of reserpine from alcoholic solution.

No MeSH data available.