Industrial Cellolignin Wastes as Adsorbent for Removal of Methylene Blue Dye from Aqueous Solutions

Șuteu, Daniela; Măluțan, Teodor

doi:10.15376/biores.8.1.427-446

Cited by 27 publications

(21 citation statements)

References 41 publications

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“…And if the line passes through the origin, then the intra-particle diffusion is the only rate-limiting step [223]. In the current study, the plots of the intra-particle diffusion model did not pass through the origin indicating that the intra-particle diffusion is not the sole limiting-step but the film diffusion also played an important role in adsorption.…”

Section: Intra-particle Diffusioncontrasting

confidence: 51%

Sesame Husk as Adsorbent for Copper(II) Ions Removal from Aqueous Solution

El-Araby¹,

Ibrahim²,

Mangood³

et al. 2017

GEP

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In this study, the adsorption behavior of copper(II) ions from aqueous solutions onto sesame husk (SH) was investigated. The effect of different parameters such as pH, contact time, adsorbent dosage, adsorbate concentration, temperature and agitation speed was studied. Thermodynamic parameters, equilibrium isotherms and kinetic data have been evaluated. The functional groups and surface morphology of SH adsorbent were characterized by FTIR and SEM. Adsorption equilibrium isotherms were expressed by Langmuir, Freundlich and Dubinin-Radushkevich (D-R) adsorption models and it was found that Langmuir adsorption model fits the experimental data better than Freundlich and D-R models. The adsorption can be best described by the pseudo second-order kinetic model.

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Section: Intra-particle Diffusioncontrasting

confidence: 51%

Sesame Husk as Adsorbent for Copper(II) Ions Removal from Aqueous Solution

El-Araby¹,

Ibrahim²,

Mangood³

et al. 2017

GEP

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“…In accordance with other studies, an activation energy of 5-40 kJ mol -1 corresponds to physical sorption, while 40-800 kJ mol -1 corresponds to [44][45][46]. Sorption of As(III), As(V), Sb(III), Sb(V), Te(IV) and Te(VI) on Fe-modified peat mainly occur according to mechanisms of physical sorption processes.…”

Section: Sorption Kinetics Study Of Metalloidssupporting

confidence: 89%

Sorption of V and VI group metalloids (As, Sb, Te) on modified peat sorbents

Ansone-Bertina

Kļaviņš

2016

Open Chemistry

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Abstract:The present work investigates arsenic, antimony and tellurium sorption using iron modified peat. The results were obtained using batch tests and the sorption was studied as a function of initial metalloid concentration, pH and sorption time, as well as the presence of competing substances. The obtained results indicate that modification of peat with Fe compounds significantly enhances the sorption capacity of the sorbents used for sorption of arsenic, antimony and tellurium. The optimal pH interval for the sorption of Sb(III) is 6.5-9 and for As(V) and Sb(V) -3-6, while As(III) and tellurium sorption using Fe-modified peat is favourable in a wider interval of 3-9. The presence of competing ions as well as HA affect sorption of metalloids on Fe-modified peat. A minor impact on the reduction of metalloid sorption was detected in the presence of nitrate, sulphate, carbonate and tartrate ions, while in the presence of phosphate and HA the sorption ability of metalloids can be considerably reduced. The obtained results of kinetic experiments indicate that sorption of metalloids on Fe-modified peat mainly occurs relying on mechanisms of physical sorption processes.Keywords: peat, sorbents, arsenic, antimony, tellurium, metalloids Environmental contextGrowing attention is being paid to environmental pollution with metalloids (As, Sb, Te) requiring new approaches for removal of these elements from water. The present work investigates arsenic, antimony and tellurium sorption using iron modified peat. Iron modified peat has high sorption capacity in respect to all environmentally relevant metalloid speciation forms [As(V), As(III), As(org.), Sb(III), Sb(V), Te(IV) and Te(VI)]. The sorption takes place according to mechanisms of physical sorption and is affected by pH of a solution as well as competing ions.

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“…Thus, it can't be used as a measure for judging about physical or chemical nature of adsorption process in liquid phase [1,27,52,53].…”

Section: Dubinin-radushkevich and Bet Isotherms Dubinin-radushkevich mentioning

confidence: 99%

A New Approach for Analysis of Adsorption from Liquid Phase: A Critical Review

Abdollahi¹

2015

J Pollut Eff Cont

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At first, the KASRA model and KASRA equation are discussed [1][2][3]. KASRA is an abbreviation for "Kinetics of Adsorption Study in the Regions with Constant Adsorption Acceleration". The KASRA model was presented by Samiey [1] in 2013 and is based on the following assumptions: (1) each time range with constant adsorption acceleration, is named a "region", (2) there are two regions before attaining plateau region, (3) the boundaries between the first and second regions and the second and third (plateau) regions are named "starting second region" (abbreviated as ssr) and "kinetics of adsorption termination" (abbreviated as kat) points, respectively and are determined by the KASRA equation, (Figures 1-4). Due to different features of the first and second regions, parameters obtained from a kinetic equation (such as the pore-diffusion, Avrami and Elovich equations, etc.) for these two regions are different from each other and the related equations for these regions come different pathways to the point q t =0 at t=0 (or q 01 according to the KASRA model). It is good to say that KASRA is a Persian word meaning king. AbstractIn different concentration ranges of adsorbed species, various interactions occur between them and surface adsorption sites and there are different regions in an adsorption isotherm. In the common method for study of adsorption process, all of these regions are considered as one region and thus there are concerns regarding using adsorption equations. In this work, based on the KASRA and ARIAN regional models, a new method is presented for analysis of adsorption kinetic and thermodynamic data, respectively. The KASRA and ARIAN models are three-and four-region models, respectively and adsorption equations are used on the basis assumptions used in these models. According to the ARIAN model, adsorption binding constant of each region of an adsorption isotherm is different from the other regions. On the other hand, based on the kinetic KASRA model and ideal-second-order (ISO) equation, during the adsorption in each initial adsorbate concentration, different interactions occur between adsorbate species and adsorbent surface sites and thus the observed adsorption binding constant is an average value of these binding constants.

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Industrial Cellolignin Wastes as Adsorbent for Removal of Methylene Blue Dye from Aqueous Solutions

Cited by 27 publications

References 41 publications

Sesame Husk as Adsorbent for Copper(II) Ions Removal from Aqueous Solution

Sesame Husk as Adsorbent for Copper(II) Ions Removal from Aqueous Solution

Sorption of V and VI group metalloids (As, Sb, Te) on modified peat sorbents

A New Approach for Analysis of Adsorption from Liquid Phase: A Critical Review

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