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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.


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Regressions of kinetics plots at different initial reserpine concentration.(experimental conditions: T = 303 K, pH = 5, c0 = 100~300 mg/L and absorbent dosage = 0.10g). (a) pseudo-first-order; (b) pseudo-second-order; (c) intra-particle diffusion.
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pone.0138619.g006: Regressions of kinetics plots at different initial reserpine concentration.(experimental conditions: T = 303 K, pH = 5, c0 = 100~300 mg/L and absorbent dosage = 0.10g). (a) pseudo-first-order; (b) pseudo-second-order; (c) intra-particle diffusion.

Mentions: The pseudo-first-order model is one of the most widely used adsorption model for the adsorption of adsorbate from a liquid solution. The liner form of pseudo-first-order model equation [30] is as following:ln(qe−qt)=lnqe−k1t(4)Where qe and qt are the adsorption capacities of reserpine (mg/g) at equilibrium and at time t, respectively, and k1 is the rate constant of pseudo-first-order adsorption (min-1). k1 and qe can be calculated from the linear plots of ln(qe-qt) versus t (Fig 6a). The results at different initial reserpine concentrations were listed in Table 1.


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

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

Regressions of kinetics plots at different initial reserpine concentration.(experimental conditions: T = 303 K, pH = 5, c0 = 100~300 mg/L and absorbent dosage = 0.10g). (a) pseudo-first-order; (b) pseudo-second-order; (c) intra-particle diffusion.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0138619.g006: Regressions of kinetics plots at different initial reserpine concentration.(experimental conditions: T = 303 K, pH = 5, c0 = 100~300 mg/L and absorbent dosage = 0.10g). (a) pseudo-first-order; (b) pseudo-second-order; (c) intra-particle diffusion.
Mentions: The pseudo-first-order model is one of the most widely used adsorption model for the adsorption of adsorbate from a liquid solution. The liner form of pseudo-first-order model equation [30] is as following:ln(qe−qt)=lnqe−k1t(4)Where qe and qt are the adsorption capacities of reserpine (mg/g) at equilibrium and at time t, respectively, and k1 is the rate constant of pseudo-first-order adsorption (min-1). k1 and qe can be calculated from the linear plots of ln(qe-qt) versus t (Fig 6a). The results at different initial reserpine concentrations were listed in Table 1.

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.


Related in: MedlinePlus