Removal of Cr3+ in fixed bed using zeolite NaY

Gazola, Fernando César; Pereira, Milton Rogério; Barros, Maria Angélica Simões Dornellas de; Silva, Edson Antônio da; Arroyo, Pedro Augusto

doi:10.1016/j.cej.2005.11.014

Cited by 40 publications

(25 citation statements)

References 18 publications

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“…A plot of q * against 0 C for the ten experimental runs using different feed concentrations generated the dynamic isotherm (isotherms obtained through breakthrough data -Ernest Jr., 1997; Gazola et al, 2006). The Langmuir parameters were then estimated through a nonlinear fitting method (Ostroski et al;.…”

Section: Calculation Of the Column Adsorption Capacity And The Lengthmentioning

confidence: 99%

Adsorption of the Dye Reactive Blue 5g in Retorted Shale

Lambrecht

Barros

Arroyo

et al. 2015

Braz. J. Chem. Eng.

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-In this study the influence of the volumetric flow rate and feed concentration was investigated for the adsorption of the reactive dye Blue 5G. Experiments were carried out in a bed packed with retorted shale, at 30 o C. The ranges investigated were flow rate 2 -10 mL/min and the feed concentration 13-105 mg/L. Mathematical models were used to represent the dynamic sorption. The double resistance model considers the effects of the axial dispersion and the mass transfer resistance of the external film and inside the particles. As a result, the mass transfer coefficient of the external film and the internal mass transfer coefficient were estimated. The Thomas model was used to simulate the experimental data. In this model the fitted parameter was the adsorption kinetic constant. The first model provided an acceptable representation of the dynamic uptake of the reactive dye Blue 5G.

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Section: Calculation Of the Column Adsorption Capacity And The Lengthmentioning

confidence: 99%

Adsorption of the Dye Reactive Blue 5g in Retorted Shale

Lambrecht

Barros

Arroyo

et al. 2015

Braz. J. Chem. Eng.

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“…The ratio t u t t / is the fraction of the total bed capacity or length utilized up to the break-point (Gazola, Pereira, Barros, Silva & Arroyo, 2006). Then, the length of mass-transfer zone (MTZ) can be written as Equation 3:…”

Section: Study Of Optimal Operational Flow Ratementioning

confidence: 99%

<b>Comparative study of the adsorption of cadmium and zinc on activated bone char

et al. 2017

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ABSTRACT. The goal of this work was to study the adsorption equilibrium of ions Zn 2+ and Cd 2+ using bovine bone char in fixed bed columns. Dynamic tests were performed with upstream flow fixed bed column, at 30 o C and average particle diameter of 0.08 mm. Initially, the optimal operating flow rate was determined, which was 4 mL min.-1 for both metals. The dynamic isotherms, obtained by mass balance in the breakthrough curves, were fitted to the Langmuir and Freundlich models. Simulations of the dynamics of ion adsorption provided satisfactory results, wherein the mass transfer coefficient was directly affected by the inflow concentration of ions, within the range of the study.Keywords: equilibrium data, heavy metals, mathematical model. Estudo comparativo da adsorção dos íons cádmio e zinco no carvão ativado de osso bovino RESUMO. O objetivo deste trabalho foi estudar o equilíbrio de adsorção de íons Zn 2+e Cd 2+ usando carvão de osso bovino em colunas de leito fixo. Testes dinâmicos foram realizados com o fluxo ascendente em coluna de leito fixo, a 30°C e diâmetro médio de partícula de 0,08 mm. Inicialmente, a vazão ótima de trabalho foi determinada, sendo de 4 mL min.-1 para ambos os metais. As isotermas dinâmicas foram obtidas pelo balanço de massa nas curvas de ruptura, e foram ajustadas aos modelos de Langmuir e Freundlich. A simulação da dinâmica de adsorção forneceu resultados satisfatórios para ambos os íons, em que o coeficiente de transferência de massa foi diretamente afetado pela concentração inicial dos íons metálicos.Palavras-chave: dados de equilíbrio, metais pesados, modelo matemático.

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“…The sample was pre-treated with sodium solutions to ensure that the sodium zeolite was in the homoionic form (Barros et al 2004a,b). The pre-treated zeolite sample was then pelletized, screened and collected with an average diameter size of 0.180 mm, as previously recommended for this fixed-bed unit (Gazola et al 2006).…”

Section: Zeolitesmentioning

confidence: 99%

“…However, several researchers have used adsorption isotherms in order to successfully represent the equilibrium data of cation removal (Petrus and Warchol 2003;Erdem et al 2004;El-Kamash at al. 2005;Ören and Kaya 2006;Inglezakis 2007;El-Kamash 2008).…”

Section: Introductionmentioning

confidence: 99%

Competing Ion Exchange of Zn²⁺ and Fe³⁺ in NaY Zeolite

Ostroski

Dantas

Silva

et al. 2012

Adsorption Science & Technology

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This study was aimed at investigating the equilibrium and interactive effects of binary solutions containing Zn +2 and Fe +3 ions in fixed-bed columns of NaY zeolite. To calculate the dynamic equilibrium through isotherms, experiments were carried out in a fixed-bed column. Reagent-grade ZnCl 2 and FeCl 3 ·6H 2 O solutions were mixed with deionized water to prepare the feed solutions with total ion concentrations in the range of 0.5-5.0 meq/ . Experiments were then carried out using Fe 3+ and Zn 2+ ions in the following concentration ratios: 0.75:0.25, 0.50:0.50 and 0.25:0.75. The experimental equilibrium data were then described using Langmuir-type models (binary Langmuir model, Langmuir-type model, Jain and Snoeyink model, and noncompetitive Langmuir model) as well as ion exchange model. Results of our analysis revealed that NaY zeolite has a higher affinity for Zn 2+ than Fe 3+ ions. The equilibrium data were best fit to the Langmuir-type model. Zn 2+ ions are removed through an ion-exchange process while the Fe 3+ ions may be preferentially adsorbed onto the already exchanged zeolitic sites. This equilibrium model was then applied to a dynamic mathematical model. We describe the equilibrium in this model by assuming the binary Langmuir-type model and mass transfer in the zeolite based on the linear driving force model.

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Removal of Cr3+ in fixed bed using zeolite NaY

Cited by 40 publications

References 18 publications

Adsorption of the Dye Reactive Blue 5g in Retorted Shale

Adsorption of the Dye Reactive Blue 5g in Retorted Shale

<b>Comparative study of the adsorption of cadmium and zinc on activated bone char

Competing Ion Exchange of Zn²⁺ and Fe³⁺ in NaY Zeolite

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Removal of Cr3+ in fixed bed using zeolite NaY

Cited by 40 publications

References 18 publications

Adsorption of the Dye Reactive Blue 5g in Retorted Shale

Adsorption of the Dye Reactive Blue 5g in Retorted Shale

<b>Comparative study of the adsorption of cadmium and zinc on activated bone char

Competing Ion Exchange of Zn2+ and Fe3+ in NaY Zeolite

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Product

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About

Competing Ion Exchange of Zn²⁺ and Fe³⁺ in NaY Zeolite