Kinetic study of adsorption of Cu(II) and Pb(II) from aqueous solutions using manganese oxide coated zeolite in batch mode

Zou, Weihua; Han, Runping; Zong-zhang, Chen; Zhang, Jinghua; Shi, Jie

doi:10.1016/j.colsurfa.2006.01.008

Cited by 212 publications

(91 citation statements)

References 17 publications

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“…A amostra utilizada no presente estudo apresentou uma área superficial e diâmetro médio dos poros iguais, respectivamente, a 282 m 2 .g -1 e 21,9 Å. Este valor de área superficial é superior aos observados na literatura para outras zeólitas. Por exemplo, Zou et al, [18] …”

Section: Características Superficiais Da Zeólita Exaurida Estudadaunclassified

“…Através da construção de um gráfico lnk 2 em função de 1/T obtêm-se uma reta onde o coeficiente angular é -Ea/R, como mostra a Figura 5. A magnitude da energia de ativação fornece informações importantes sobre o tipo de adsorção [18]. A adsorção física é um processo reversível, usualmente representada por valores de energia de ativação entre 5kJ.mol -1 e 20kJ.mol -1 .…”

Section: Energia De Ativação Do Processo De Adsorçãounclassified

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Cinética De Adsorção De Manganês Em Zeólitas Exauridas

Figueiredo¹,

Leão²,

Leão³

2018

Tecnologia Em Metalurgia Materiais E Mineração

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ResumoEfluentes ricos em manganês, como os das indústrias extrativas, de vidro e cerâmicas, plantas de galvanização, entre outros, são considerados um problema ambiental devido principalmente ao seu poder toxicológico. O íon manganês é um poluente devido às suas propriedades organolépticas e é considerado um metal de difícil remoção devido à sua alta solubilidade, sendo usualmente encontrado em efluentes na forma do íon divalente Mn 2+ . Diversos métodos de tratamento têm sido aplicados a esses tipos de efluentes com objetivo de enquadramento dos mesmos à legislação ambiental vigente. Uma dessas alternativas é a adsorção/troca iônica tanto em batelada como em colunas de leito fixo, particularmente quando a concentração de metais é baixa. Visando o tratamento de efluentes que contêm o íon manganês, o presente trabalho descreve a remoção do íon pelo processo de adsorção/troca iônica utilizando uma zeólita exaurida. Foram realizados estudos cinéticos nas temperaturas de 25°C, 35°C, e 60°C, que revelaram uma alta remoção desde o início do contato entre a solução rica em manganês e a zeólita sendo que o equilíbrio foi atingido após percorridas 3 horas de experimento. Os dados experimentais se ajustaram melhor ao modelo de pseudossegunda ordem para adsorção do íon manganês na zeólita investigada. Além disso, observou-se nesses experimentos o aumento da temperatura eleva o carregamento e a partir do valor da energia de ativação calculada de 55,4KJ/mol tem-se indicação de que o processo de adsorção em questão é uma quimiossorção. Palavras-chave: Adsorção; Leito fixo; Manganês; Energia de ativação. MANGANESE ADSORPTION KINETICS ON EXHAUSTED ZEOLITES AbstractGalvanizing plants as well as the mining, glass and ceramics industries among others can produce manganese-laden effluents, which are considered an environmental issue mainly due to their organoleptic properties and because the highly soluble Mn 2+ ion is difficult to remove from most wastewaters when only pH control is applied. Thus several treatment methods have been proposed to treat these effluents so that they can comply with environmental regulations. One of such treatments is adsorption/ion exchange (either batchwise or fixed bed) particularly when the metal concentration is low. Biosorbents, ion exchange resins, and zeolites have been investigated as potential sorbents for manganese. Aimed at treating manganese containing effluents, the current work describes manganese removal by adsorption/ion exchange in a spent faujasite zeolite used in the oil industry. Batch kinetic studies were carried out at 25°C, 35°C and 60°C with this spent zeolite and revealed that equilibrium was reached within 3 hours, whereas the experimental kinetic data could be described by the pseudo-second order model. It was observed that the loading rate increased with temperature with an activation energy of 55,4kJ/mol calculated from the rate constant values; an indication of chemisorption during manganese adsorption on the spent faujasite zeolite.

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Section: Características Superficiais Da Zeólita Exaurida Estudadaunclassified

Section: Energia De Ativação Do Processo De Adsorçãounclassified

Cinética De Adsorção De Manganês Em Zeólitas Exauridas

Figueiredo¹,

Leão²,

Leão³

2018

Tecnologia Em Metalurgia Materiais E Mineração

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“…These results are in agreement with the findings of other researchers. In their study on the adsorption of Cu and Pb on raw zeolite, Zou et al [20] found that adsorption was highest for Pb unlike Cu. The adsorptive capacity of raw zeolite was 61 mmol•kg −1 for Pb and 134 mmol•kg −1 for Cu.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

pH Dependence of Lead Adsorption on Zeolites

Kabwadza-Corner¹,

Johan²,

Matsue³

2015

JEP

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The adsorption of Pb on zeolites A4, X, Y and mordenite was studied at various initial pH with the purpose of assessing the pH dependence of Pb adsorption. The adsorption was conducted using 0 -0.6 mM Pb(NO3)2 in the presence of 100 mM NH4NO3 and pH adjustment done using HNO3. The coexisting NH4NO3 served as a representative of other cations available in nature. The study was conducted at initial solution pH ranging from 3 -5. Adsorption results were analyzed using Langmuir isotherm analysis. Adsorption was noted to be dependent on pH with increasing adsorption as pH increased from 3 -5 for zeolites A4, X and Y. The adsorption of Pb on mordenite on the other hand did not show any dependence on pH since it was almost constant within the studied pH range. The adsorptive capacities were 2500, 2000, 588 and 179 mmol•kg −1 for A4, X, Y and mordenite, respectively. The results of this study can be used in designing or planning for the clean-up of polluted water using adsorption techniques. An important attribute of these findings was that the samples studied were shown to have the capacity of removing even very low concentration of Pb, a property which is hardly achievable by most adsorbents.

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“…If the intraparticle diffusion is involved in the adsorption process then plot of q t (mg g ) should be linear and lines pass through the origin [6,15].…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Biosorption Studies For Removal of Cu (II) ions Onto Saccharum Bengalense an Efficient and Eco-Friendly Biosorbent

Din¹

2014

Turk J Bioch

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Objective: In this research work, a low-cost biosorbent derived from the pulp of Saccharum bengalense (SB) was used as an adsorbent material for the removal of Cu (II) ions from aqueous solution. Methods: A batch adsorption method was experimented for biosorptive removal of copper ions from the aqueous solution. Results: Nearly 90% removal of copper is possible at initial pH 6.0, under the batch test conditions. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) adsorption isotherms have been applied to describe the biosorption of Cu (II) by SB. It was found that biosorption of Cu (II) by SB followed Langmuir and Freundlich model. The monolayer adsorption capacity of SB as obtained from Langmuir isotherm at 40 0 C was found to be 10.42 mg/g at 323K. The Cu (II) adsorption data was analyzed by applying pseudo-first-order and pseudo-second-order kinetic models. The intra-particle diffusion model was applied to investigate the rate-determining step. It was found that the biosorption of Cu (II) ions on SB followed pseudo second-order rate kinetics. Thermodynamic parameters such as free energy change (ΔG°), enthalpy change (ΔH°) and entropy change (ΔS°) have been calculated respectively revealed the spontaneous, feasible and endothermic nature of adsorption process. Conclusion:The results of the present investigation suggested that biosorbent SB can be used as an economically feasible and environmentally friendly biosorbent for the removal of Cu (II) from aqueous solutions. ries of Erlenmeyer flasks of 250 mL capacity, sealed with glass stoppers and para film to prevent contamination. The effect of influencing factors, such as adsorbent dosage, effect of pH, time and temperature were studied. For each experiment, 50 mL solution containing Cu metal ions, of known concentration, was used. For adsorption isotherms, Cu containing solutions of different known concentrations C 0 (mg/L) were agitated with a known amount of adsorbent until equilibrium was achieved. The kinetics of adsorption were determined by analyzing adsorptive uptake (q t mg/g) of the Cu (II) ions from the aqueous solutions at different time intervals. All experiments were performed in triplicate and an average of three values reported. The deviation was found to be 2% of the average value. After the equilibrium period, the suspensions were filtered via filter paper Whatman 42. The concentrations of Cu metal ions were determined by atomic absorption spectrometry. A Perkin-Elmer 2380 Atomic Absorption Spectrophotometer, with air-acetylene flame, was used for the determination of copper concentration.The percentage removal efficiency of adsorbent (%R) for copper metal was calculated as follows:The adsorption capacity of SB for copper metal at equilibrium q e (mg/g) was calculated as follows:The amount of Cu metal adsorbed onto SB biomass at any time t, q t (mg/g) was calculated as follows:Where C 0 is the initial copper ions concentration (mg/L), C e is the concentration of copper ions at equilibrium (mg/L), C t is the concentration of copper meta...

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Kinetic study of adsorption of Cu(II) and Pb(II) from aqueous solutions using manganese oxide coated zeolite in batch mode

Cited by 212 publications

References 17 publications

Cinética De Adsorção De Manganês Em Zeólitas Exauridas

Cinética De Adsorção De Manganês Em Zeólitas Exauridas

pH Dependence of Lead Adsorption on Zeolites

Biosorption Studies For Removal of Cu (II) ions Onto Saccharum Bengalense an Efficient and Eco-Friendly Biosorbent

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