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https://repository.unad.edu.co/handle/10596/29342| Title: | Removal of the brilliant blue through packed columns using corncobs Remoción de azul brillante mediante columnas empacadas usando tuza de maíz Remoção de azul brilhante, utilizando colunas tuza milho embalados |
| metadata.dc.creator: | Hormaza Anaguano, Angelina Villada Villada, Yurany Andrea |
| Keywords: | Adsorption on continuous; bed height; anionic dye; curve of rupture; saline effect.;Adsorción en continuo; altura de lecho; colorante aniónico; curva de ruptura; efecto salino.;adsorção contínua; altura do leito; corantes aniônicos; curva de ruptura; efeito salino. |
| Publisher: | Universidad Nacional Abierta y a Distancia, UNAD |
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| metadata.dc.format.*: | application/pdf |
| metadata.dc.type: | info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| Description: | This research shows the adsorbent potential of corncobs in the removal of the anionic bright blue colorant on packed beds. It was evaluated the effect of pH parameters from this medium, particle size, saline presence and column height. The samples were analyzed by defined intervals of time. The colorant quantity removed was quantified by means of ultraviolet-visible spectroscopy. Models of Adams-Bohart, Thomas and Yoon-Nelson were used to predict the breakthrough curves using nonlinear regression and so set the characteristic parameters of the process. BDST model was used to express the influence of bed height into the breakthrough curve. It was found that acid pH (pH = 2.0) smaller particle size (0.3 mm < x < 0.5 mm) and larger bed height (Z = 20 cm) favor the transfer of colorant to the adsorbent material, reaching greater retention of bright blue on the corncob. The presence of NaCl in the solution reduces the efficiency of adsorption. In terms of models, the Thomas model presented the best setting for the description of the breakthrough curve to the experimental conditions (R2 = 0.93 -0.94), while Adams-Bohart model offered a good fit (R2 = 0.96-0.99) for the dynamic behavior limited to the initial part of the process. Yoon-Nelson model presented a considerable drift between the experimental data and the predicted data. Finally, the BDST model showed a good correlation, R2 = 0.92 -0.99, establishing that the height is a determining factor for scaling of process Esta investigación muestra el potencial adsorbente de la tuza de maíz en la remoción del colorante aniónico azul brillante sobre lechos empacados. Se evaluó efecto de los parámetros pH del medio, tamaño de partícula, presencia salina y altura de columna. Las muestras fueron analizadas a intervalos definidos de tiempo. La cantidad del colorante removido fue cuantificada por medio de espectroscopia Ultravioleta – Visible. Los modelos de Adams-Bohart, Thomas y Yoon-Nelson fueron utilizados para predecir las curvas de ruptura usando regresión no lineal y con ello establecer los parámetros característicos del proceso. El modelo BDST fue empleado para expresar la influencia de la altura del lecho en la curva de ruptura. Se encontró que a pH ácido (pH = 2.0) menor tamaño de partícula (0.3 mm < x < 0.5 mm) y mayor altura de lecho (Z = 20 cm) se favorece la transferencia de colorante al material adsorbente, alcanzando mayor retención del azul brillante sobre la tuza de maíz. La presencia de NaCl en la solución reduce la eficiencia en la adsorción. En cuanto a modelos, el de Thomas presentó el mejor ajuste para la descripción de las curvas de ruptura a las condiciones experimentales (R2 = 0.93-0.94), mientras Adams-Bohart ofreció un buen ajuste (R2 = 0.96- 0.99) para el comportamiento dinámico limitado a la parte inicial del proceso. Yoon-Nelson presentó un desvío considerable entre la información experimental y la predicha. Finalmente, el BDST mostró una adecuada correlación, R2 = 0.92-0.99, estableciendo que la altura es determinante para el escalado del proceso. Esta pesquisa mostra o potencial adsorvente do sabugo de milho na remoção do corante aniônico azul brilhante sobre leitos empacotados. Foi avaliado o efeito dos parâmetros pH do meio, tamaño de partícula, presença de salinidades e altura da coluna. As amostras foram analisadas em intervalos de tempo definidos. A quantidade de corante removido foi quantificada por espectroscopia de UV - Visível. Modelos Adams-Bohart, Thomas e Yoon-Nelson foram utilizados para prever as curvas de ruptura através de regressão não-linear e, assim, estabelecer os parâmetros característicos do processo. O modelo BDST foi utilizado para expressar a influência da altura do leito na curva de ruptura. Verificou-se que a pH ácido (pH = 2,0) o tamanho de partícula mais pequeno (0.3 mm <x <0,5 mm) e maior altura do leito (Z = 20 cm) favorece a transferência do material adsorbente de corante atingindo uma maior retenção de azul milho brilhante no sabugo. A presença de cloreto de sódio na solução reduz a eficiência de adsorção. Quanto aos modelos, o Thomas apresentou o melhor ajuste para descrever as curvas de ruptura para as condições experimentais (R2 = 0,93 a 0,94), enquanto Adams-Bohart oferecido um bom ajuste (R2 = 0,96-0,99) para o comportamento dinâmico limitado para a parte inicial do processo. Yoon-Nelson apresentou um desvio significativo entre o experimental ao previsto. Por fim, BDST mostrou boa correlação, R2 = 0,92-0,99, estabelecendo que a altura seja crucial para o proceso de escala. |
| metadata.dc.source: | Revista de Investigación Agraria y Ambiental; Vol. 5, Núm. 1 (2014); 57-68 Revista de Investigación Agraria y Ambiental; Vol. 5, Núm. 1 (2014); 57-68 2145-6453 2145-6097 |
| URI: | https://repository.unad.edu.co/handle/10596/29342 |
| Other Identifiers: | http://hemeroteca.unad.edu.co/index.php/riaa/article/view/911 10.22490/21456453.911 |
| Appears in Collections: | Revista RIAA |
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