Isotherm and thermodynamic data of adsorption of methylene blue from aqueous solution onto peat

Fernandes, Andreia Neves; Almeida, Carlos; Debacher, Nito Ângelo; Sierra, Maria Marta de Souza

doi:10.1016/j.molstruc.2010.08.006

Cited by 111 publications

(59 citation statements)

References 37 publications

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“…Adsorption processes with ΔG° values ranging from -20 to 0 kJ/mol correspond to the physical monolayer adsorption [10][11]. The obtained results show that this will be the case of monolayer adsorption in all studied cases.…”

Section: Thermodynamic Parametersmentioning

confidence: 59%

Sorption of Iron, Manganese, and Copper from Aqueous Solution Using Orange Peel: Optimization, Isothermic, Kinetic, and Thermodynamic Studies

Surovka¹,

Pertile²

2017

Pol. J. Environ. Stud.

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The issue of wastewater is becoming more and more important today because of the new European Union laws leading to even stricter norms. Heavy metals belong to some of the negative elements present in wastewater. Their occurrence in wastewater caused by different industrial processes, such as electroplating, metal finishing, metallurgy, chemical production, mining, and production of paper or batteries, raises many questions because of their toxicity even in small concentrations [1].Sorption of heavy metals is one of the most promising technologies used for the removal of contaminants from water. It is a potential alternative to conventional procedures for its low cost, easy availability, and no nutritional requirements. Sorption minimizes the volume of chemical and/or biological sludge, which must subsequently be disposed of. It is also effective for detoxifying dilute wastewaters. Great attention has recently been paid to sorption of heavy metals from solutions using biological Pol. J. Environ. Stud. Vol. 26, No. 2 (2017) AbstractThe adsorption of selected metals (Cu, Mn, and Fe) from water solution using orange peel was studied by means of batch mechanism. The aim of this study was to determine the dependency of the sorption process on pH of the solution, the initial concentration of the sorbent, contact time, and temperature. The Langmuier and Freundlich isothermal models were used to describe the sorption isotherms of ions. In this case the Langmuier model is more suitable to describe the data. The adsorption efficiency of removing copper (q 20 = 5 mg/g) and manganese (q 20 = 15 mg/g) by using orange peel was approximately 90%. Under optimal conditions, the efficiency of removing iron (q 20 = 10 mg/g) was approximately 55%. When studying the kinetics we discovered that the sorption process will follow the pseudo second-order. The thermodynamic parameters show an exothermic character of sorption, and the processes are spontaneous and favourable. The results indicate that it is possible to use orange peel effectively for removing selected metals from wastewater.

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Section: Thermodynamic Parametersmentioning

confidence: 59%

Sorption of Iron, Manganese, and Copper from Aqueous Solution Using Orange Peel: Optimization, Isothermic, Kinetic, and Thermodynamic Studies

Surovka¹,

Pertile²

2017

Pol. J. Environ. Stud.

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“…But it should be noted that different linear and the adsorbent. The rate law for this system i s forms of the same model would significantly effect on expressed as [25], obtained values of parameters, for example Yuh-Shan Ho (10) equations to fit the kinetic sorption data. As a result using…”

Section: Results and Disscusionmentioning

confidence: 99%

“…selection of method for eliminating metal ions from water and waste water [9]. Adsorption technology has been MATERIALS AND METHODS considered as an economical, efficient and promising technology in wastewater treatment for removal of metal Materials: Chitosan with minimum 85% deacetylation was ions [10]. Choosing a proper adsorbent plays an important purchased from Sigma-Aldrich (USA).…”

Section: Introductionmentioning

confidence: 99%

Isotherm and Kinetics of Fe(II) Adsorption onto Chitosan in a Batch Process

Radnia¹

2011

IJEE

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Abstract:In this study removal of Fe(II) by chitosan adsorbent was experimentally investigated in a batch system. The adsorbent dose and pH of the metal solution was fixed at 0.15 g and 4, respectively. Adsorption experiments were carried out at initial concentration range of 10-50 mg lG at 20°C. Equilibrium studies showed 1 that experimental data were well fitted to Langmuir-Freundlich isotherm model. Linear and non-linear forms of pseudo-first-order and pseudo-second-order kinetic models were employed to describe the kinetic adsorption processes. The model parameters were confidently recovered. The kinetics followed the non-linear form of pseudo-first-order model which represents adsorption of Fe(II) on chitosan takes place through a physical process. The examination of kinetic data also revealed that the adsorption rate was dominated by intra-particle diffusion mechanism.Key words: Chitosan % Intraparticle diffusion % Iron removal % Isotherm models % Pseudo-first-order % Pseudo-second-order

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“…Its molecular formula is C 16 Although the use of neem leaves for the adsorption of MB and MG dyes has not been reported elsewhere (to the best of the knowledge of the authors), several adsorbents of plant origin have been successfully used to remove these dyes from aqueous solution. Some of the reported materials for the removal of methyl blue dye include some carbons [19], activated carbon [20], Indian Rosewood sawdust [21], Scolymus hispanicus L. [22], Peat [23], Mansonia altissima wood sawdust [24] and garlic peel [25]. Similarly, some natural adsorbents are excellent for the removal of malachite green from aqueous solution including ground nut shell [26], bagasse fly ash/activated carbon [27], cyclodextrin [28], granular activated carbon and natural zeolite [29], bentonite [30], etc.…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational chemistry studies on the removal of methylene blue and malachite green dyes from aqueous solution by neem (Azadirachta indica) leaves

Odoemelam

Emeh

Eddy

2018

Journal of Taibah University for Science

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Adsorption of methylene blue and malachite green dyes from aqueous solution by neem leaves was studied using experimental and computational chemistry approaches. The two dyes have N-H stretch, C≡C vibration vibration, C=C stretch and C-Cl stretch as common functional groups. Batch adsorption experiments were concluded by measuring absorbance (at wavelength of maximum absorption, i.e. 660 and 630 nm for methylene blue and malachite green dyes, respectively). The adsorption of the dyes on neem leaves favoured Langmuir and Temkin isotherms and was influenced by concentration, biomass dose, pH and by contact time, and favoured chemisorption mechanism. Although surface adsorption and intra particle diffusion were identified as the rate-limiting steps, a pseudo second-order kinetics was also favoured. Quantum chemical analysis supported better adsorption of methylene blue dye on neem seed surface than malachite green dye and through Fukui function analysis, the site for adsorption of the dyes was proposed.ARTICLE HISTORY

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Isotherm and thermodynamic data of adsorption of methylene blue from aqueous solution onto peat

Cited by 111 publications

References 37 publications

Sorption of Iron, Manganese, and Copper from Aqueous Solution Using Orange Peel: Optimization, Isothermic, Kinetic, and Thermodynamic Studies

Sorption of Iron, Manganese, and Copper from Aqueous Solution Using Orange Peel: Optimization, Isothermic, Kinetic, and Thermodynamic Studies

Isotherm and Kinetics of Fe(II) Adsorption onto Chitosan in a Batch Process

Experimental and computational chemistry studies on the removal of methylene blue and malachite green dyes from aqueous solution by neem (Azadirachta indica) leaves

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