Comparison of linear and nonlinear analysis in estimating the Thomas model parameters for methylene blue adsorption onto natural zeolite in fixed-bed column

Han, Runping; Wang, Yi; Zou, Weihua; Wang, Yuanfeng; Shi, Jie

doi:10.1016/j.jhazmat.2006.12.027

Cited by 219 publications

(90 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…La selección del modelo más adecuado se basó en los criterios de mejor ajuste y menor error registrado. Para el procesamiento de los datos se utilizó el programa de Microsoft Office Excel y el complemento de optimización Solver [14,15].…”

Section: Análisis De Errorunclassified

Equilibrio, termodinámica y modelos cinéticos en la adsorción de Rojo 40 sobre tuza de maíz

Figueroa

Moreno

Hormaza

2015

rev.ing.univ.Medellin

View full text Add to dashboard Cite

ResumenLa adsorción es un método ampliamente utilizado para el tratamiento de contaminantes disueltos. Diversos residuos agroindustriales han sido explorados como potenciales adsorbentes, mostrando alta eficiencia en la eliminación de colorantes. Para el escalado de este proceso se requieren modelos cinéticos y de equilibrio para cada pareja adsorbato-adsorbente. En este trabajo se evaluaron el equilibrio, la cinética y la termodinámica del sistema tuza de maíz-rojo 40 bajo sistema discontinuo a pH = 2.0 a las temperaturas de 25, 40 y 55 °C. Los modelos de Langmuir, Freundlich y Temkin fueron seleccionados para la representación de las isotermas, en tanto que las ecuaciones de Lagergren, Ho y Elovich, para la cinética del proceso. El modelo de Freundlich presentó el mejor ajuste a las isotermas, la cinética de adsorción fue mejor descrita por la ecuación de Ho y los valores para la energía libre de Gibbs, y la entropía señalaron la espontaneidad y factibilidad del proceso.Palabras clave: isotermas de adsorción, cinética, rojo 40, adsorbentes de bajo costo, tuza de maíz.

show abstract

Section: Análisis De Errorunclassified

Equilibrio, termodinámica y modelos cinéticos en la adsorción de Rojo 40 sobre tuza de maíz

Figueroa

Moreno

Hormaza

2015

rev.ing.univ.Medellin

View full text Add to dashboard Cite

show abstract

“…The first ones are the non-structural models which may agree quite well with the experimental data; nonetheless, these do not include parameters describing adsorbent structure and are thus more or less of an interpolative nature. Among these are the Thomas model (Han et al, 2007) and models based on the law of mass action (Moraes et al, 2009;Papini et al, 1999), applied to a wide range of adsorption processes of metals (Papini et al, 1999), heterocyclic compounds (Han et al, 2007), and enzymes (Moraes et al, 2009). The second subgroup are the structural models, which usually also agree quite well with experimental data and include parameters describing adsorbent structure such as adsorbent particle size (Dadwhal et al, 2009;Forrer et al, 2008;Quek and Al-Duri, 2007), micro-particle size (Dadwhal et al, 2009), particle size distribution (Du et al, 2007) or other characteristic dimensions (Zabka et al, 2006), and are thus more of an extrapolative nature.…”

Section: Introductionmentioning

confidence: 99%

Comparison of adsorption equilibrium and kinetic models for a case study of pharmaceutical active ingredient adsorption from fermentation broths: parameter determination, simulation, sensitivity analysis and optimization

Likozar

Senica²,

Pavko³

2012

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

-Mathematical models for a batch process were developed to predict concentration distributions for an active ingredient (vancomycin) adsorption on a representative hydrophobic-molecule adsorbent, using differently diluted crude fermentation broth with cells as the feedstock. The kinetic parameters were estimated using the maximization of the coefficient of determination by a heuristic algorithm. The parameters were estimated for each fermentation broth concentration using four concentration distributions at initial vancomycin concentrations of 4.96, 1.17, 2.78, and 5.54 g l −1 . In sequence, the models and their parameters were validated for fermentation broth concentrations of 0, 20, 50, and 100% (v/v) by calculating the coefficient of determination for each concentration distribution at the corresponding initial concentration. The applicability of the validated models for process optimization was investigated by using the models as process simulators to optimize the two process efficiencies.

show abstract

“…Embora o método dos mínimos quadrados não lineares seja considerado mais preciso do que o método linear, quando aplicados à modelagem dos dados de colunas de adsorção (HAN et al, 2007), alguns trabalhos recentes continuam empregando a análise linear, demonstrando que o mesmo também pode descrever adequadamente a adsorção de amônia em zeólitas (ZHENG et al, 2008). Assim, tanto o método linear como não linear foram testados no presente estudo para fins comparativos.…”

Section: Remoção De Amônia De Efluentes Reaisunclassified

Utilização De Colunas De Leito Fixo Com Adsorventes Naturais Para a Remoção De Amônia De Efluentes Da Suinocultura

Higarashi

2012

RHE

View full text Add to dashboard Cite

RESUMOO presente trabalho avaliou a eficiência de uma coluna de leito fixo preenchida com zeólita natural como uma opção de tratamento terciário para a remoção de amônia de efluentes suinícolas. Os experimentos foram conduzidos utilizando efluentes reais, previamente tratados em uma planta comercial através de processos biológicos e físico-químicos. Os resultados demonstraram que, nas condições experimentais avaliadas, a taxa de fluxo volumétrica de 4,7 L.h -1 apresentou o melhor desempenho e a zeólita pode ser regenerada e reutilizada, embora ocorram perdas de 4-5% da sua capacidade de remoção a cada regeneração. Palavras-chave: Coluna de leito fixo. Zeólita natural. Efluente suinícola. Modelagem. ABSTRACTThis work evaluated the efficiency of fixed-bed column filled with natural zeolite, as a tertiary treatment option to remove ammonium from swine effluent. Experiments were carried out with real swine wastewater, previously treated in a commercial treatment plant by biological and physicalchemical processes. Results have shown that under these experimental conditions, volumetric flow rate of 4.7 L.h -1 presented the better performance and zeolite can be regenerated and reused although after each regeneration, decreases of 4-5% on removal capacity were observed.

show abstract

Comparison of linear and nonlinear analysis in estimating the Thomas model parameters for methylene blue adsorption onto natural zeolite in fixed-bed column

Cited by 219 publications

References 39 publications

Equilibrio, termodinámica y modelos cinéticos en la adsorción de Rojo 40 sobre tuza de maíz

Equilibrio, termodinámica y modelos cinéticos en la adsorción de Rojo 40 sobre tuza de maíz

Comparison of adsorption equilibrium and kinetic models for a case study of pharmaceutical active ingredient adsorption from fermentation broths: parameter determination, simulation, sensitivity analysis and optimization

Utilização De Colunas De Leito Fixo Com Adsorventes Naturais Para a Remoção De Amônia De Efluentes Da Suinocultura

Contact Info

Product

Resources

About