Adsorption of copper from aqueous solution on Brassica cumpestris (mustard oil cake)

Ajmal, Mohammad; Rao, Rifaqat Ali Khan; Khan, Moonis Ali

doi:10.1016/j.jhazmat.2005.03.029

Cited by 84 publications

(45 citation statements)

References 16 publications

(19 reference statements)

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“…Thermodynamic parameters such as change in free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°) for adsorption of Cu (II) onto SB were calculated using following equations [23][24][25] …”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…Thermodynamic parameters were measured by the following equation [20][21][22]: (14) where ∆S, R, ∆H and T were the entropy, gas constant, enthalpy and absolute temperature, respectively. Gibbs free energy (∆G) was determined as the well-known equation:…”

Section: Diffusion Process and Thermodynamic Study Of L-trp Adsorptionmentioning

confidence: 99%

Adsorption behavior of L-tryptophan on ion exchange resin

Wei

Chen

Fan

et al. 2011

Korean J. Chem. Eng.

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A batch method was applied to investigate the adsorption behavior and mechanisms of L-tryptophan (Ltrp) on ion exchange resins. HZ-001 and JK006 were proved to be ideal adsorbents due to their large loading capacity and favorable selective adsorption for L-trp. Langmuir, Freundlich, and Dubinin-Radushkevich equations were applied to simulate the experimental data to describe the adsorption process of L-trp onto HZ-001 and JK006. The maximum loading capacity (at pH 5.0, 30 o C), determined by the Langmuir and Dubinin-Radushkevich models, was close to each other (833 mg/g vs. 874 mg/g) for HZ-001, while discrepant (833 mg/g vs. 935 mg/g) for JK006. Three diffusion-controlled kinetic models were utilized to analyze the results in order to identify the adsorption mechanism. The adsorption kinetics of L-trp onto cation exchange resins was investigated under different experimental conditions, including initial solution pH, temperature, initial L-trp concentration, and adsorbent dosage. Moreover, the diffusion process of L-trp onto HZ-001 and JK006 was evaluated at different initial adsorbate concentrations. The thermodynamic parameters, obtained from the kinetic data, demonstrated that L-trp could be adsorbed spontaneously onto both resins.

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“…Muitas revisões neste assunto são avaliadas, com aplicações em remoção de metais pesados, compostos orgânicos e corantes (Crini 2006). Os resíduos da agricultura são os mais comuns materiais brutos estudados para este fim, visto que eles são renováveis, usualmente acessíveis em larga quantidade e de custo mais baixo do que outros materiais para manufaturar uma diversidade de tipos de adsorvente (Ajmal et al 2005;Tan et al 2007;Karagöz et al 2008).…”

Section: Introductionunclassified

Obtenção e caracterização de carvão ativado de caroço de buriti (Mauritia flexuosa L. f.) para a avaliação do processo de adsorção de cobre (II)

Pinto

Silva

Saraiva³

2013

Acta Amaz.

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RESUMONa região amazônica, algumas indústrias despejam cobre nos corpos receptores que, em elevadas concentrações, é tóxico para os seres vivos. A remoção de cobre de efluentes industriais é realizada por diversos processos como a adsorção. Neste trabalho mostrou-se o resultado da adsorção de cobre (II) em carvão ativado de caroço de buriti carbonizado a 400 ºC e ativado a 900 ºC. O carvão ativado foi caracterizado em termos de área específica, tamanho dos poros, densidades aparente e real, porosidade, microscopia eletrônica de varredura, conteúdo de cinzas, pH, umidade, carbono fixo e grupos funcionais de superfície. O estudo de equilíbrio de adsorção avaliou a influência do diâmetro das partículas do carvão, do tempo de contato adsorvente/adsorbato, do pH e da concentração inicial da solução de cobre (II) sobre a remoção de cobre (II). Com base nos resultados, concluiu-se que há uma maior eficiência de remoção de cobre (II) para diâmetro < 0,595 mm, tempo de contato de 300 minutos, pH 4,0 e concentrações iniciais de cobre (II) de 50 e 80 mg L -1. O modelo matemático de Langmuir foi o que melhor se ajustou aos dados de equilíbrio de adsorção. A partir do tempo de contato de 15 minutos todas as concentrações de equilíbrio ficaram abaixo do máximo permitido de 1,0 mg L -1 previsto pela legislação vigente para lançamento de efluentes em corpos receptores. PALAVRAS-CHAVE: Adsorção, Cu (II), Carvão Ativado, Buriti. Production and characterization of the activated carbon from buriti stone (Mauritia flexuosa L. f.) to evaluate the adsorption's process of copper (II) ABSTRACTIn the Amazon region some industries discharges copper into watercourse that in high concentrations is toxic to the biota. The removal of copper from industrial effluent is performed by several processes such as adsorption. This work shows the result of copper (II) adsorption on activated carbon obtained from buriti kernel, carbonized at 400 ºC and activated at 900 ºC. The activated carbon was characterized according to specific area, pore size, apparent and real density, porosity, scanning electron microscopy, ash content, pH, moisture, fixed carbon and surface functional groups. The study of adsorption equilibrium evaluated the influence of the coal particles diameter, contact time adsorbent/adsorbate, pH and copper (II) solution initial concentration on copper (II) remotion. The results showed a higher removal efficiency of copper (II) to the diameter D < 0.595 mm, contact time of 300 minutes, pH of 4.01 and the copper (II) initial concentrations of 50 and 80 mg L-1. The mathematical model of Langmuir was the best fit to the adsorption equilibrium data. From the contact time of 15 minutes, all the equilibrium concentrations were below the allowed maximum of 1,0 mg L-1 provided by law for discharging effluents into receiving bodies.

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Adsorption of copper from aqueous solution on Brassica cumpestris (mustard oil cake)

Cited by 84 publications

References 16 publications

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

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

Adsorption behavior of L-tryptophan on ion exchange resin

Obtenção e caracterização de carvão ativado de caroço de buriti (Mauritia flexuosa L. f.) para a avaliação do processo de adsorção de cobre (II)

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