Cellulosic Substrates for Removal of Pollutants From Aqueous Systems: A Review. 2. Dyes

Hubbe, Martin A.; Hasan, S. H.; Ducoste, Joel J.

doi:10.15376/biores.7.2.2592-2687

Cited by 116 publications

(122 citation statements)

References 1,260 publications

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“…The Dubinin-Radushkevich isotherm was also employed to ascertain the nature of the sorption process. The Langmuir isotherm is used to describe monolayer sorption on the surface of a solid made up of elementary sites, each of which can adsorb one sorbate molecule (Hubbe et al (2011). The Langmuir isotherm is based on the assumptions that (i) all adsorption sites are equivalent, (ii) a monolayer is formed and adsorbed molecules do not deposit on one another, (iii) sorption is by the same mechanism, and (iv) adsorbed molecules do not interact.…”

Section: Fig 4 Variation Of Removal Efficiency and Quantity Adsorbementioning

confidence: 99%

“…The pseudo second order kinetic is applicable to sorption mechanisms where the rate-limiting step involves the participation of two independently mobile functional groups at the substrate surface, or where remaining sorption sites become increasingly reluctant to fill as a result of charge repulsion, crowding, or saturation (Hubbe et al (2012). If the rate of sorption depends on a second order equation based on the sorbate uptake, the pseudosecond order chemisorption kinetics may be expressed as Eq.…”

Section: Fig 8b Temkin Isotherm For Khaya Ivorensismentioning

confidence: 99%

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Effect of Particle Size on the Sorption of Lead from Water by Different Species of Sawdust: Equilibrium and Kinetic Study

Nnaji

Emefu

2017

BioResources

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Both the effect of particle size and initial concentration on the adsorption of lead by sawdust of two timber species were investigated using batch experimental equilibrium and kinetic studies. A 100% lead removal efficiency was recorded for the optimum particle size of 1.18 mm for Pycnanthus angolensis and 0.85 mm for Khaya ivorensis at an initial lead concentration of 10 mg/L. Freundlich isotherm (0.83 ≤ R 2 ≤ 0.96 for Khaya ivorensis and 0.94 ≤ R 2 ≤ 1.0 for Pycnanthus angolensis) performed better than Langmuir and Temkin isotherms. The Dubinin-Radushkevich isotherm was used to ascertain the sorption mechanism. Mean sorption energy (12.48 kJ/mol for Pycnanthus angolensis and 13.42 kJ/mol for Khaya ivorensis) indicated that adsorption was by ion exchange. The pseudo-first order kinetic model (0.96 ≤ R 2 ≤ 1.0 for Khaya ivorensis and 0.90 ≤ R 2 ≤ 1.0 Pycnanthus angolensis) performed better than others with respect to R 2 values, while the intraparticle diffusion model performed better than the other kinetic models with respect to absolute mean error (AME).

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Section: Fig 4 Variation Of Removal Efficiency and Quantity Adsorbementioning

confidence: 99%

Section: Fig 8b Temkin Isotherm For Khaya Ivorensismentioning

confidence: 99%

Effect of Particle Size on the Sorption of Lead from Water by Different Species of Sawdust: Equilibrium and Kinetic Study

Nnaji

Emefu

2017

BioResources

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“…The methodologies generally adopted to treat dye wastewater are classified in the following four categories: (I) physical, (II) chemical, (III) biological, and (IV) acoustical, radiation, and electrical processes (Gupta and Suhas 2009). Among these methods, adsorption is a well-known equilibrium separation process and an effective method for water decontamination applications (Hubbe et al 2012). Activated carbon is the preferred adsorbent; however, its widespread application is restricted due to its high cost.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive Removal of Methylene Blue from Aqueous Solution by Spent Mushroom Substrate: Equilibrium, Kinetics, and Thermodynamics

Yan¹,

Lijuan²

2013

BioResources

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Spent mushroom substrate (SMS), a renewable bio-waste from the mushroom-growing industry, was used as an adsorbent to remove methylene blue (MB) from aqueous solution. SMS was characterized using scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR). Adsorption experiments with the SMS adsorbent were performed based on various parameters, such as adsorbent dose, initial MB dye concentration, initial pH, contact time, and temperature. The Langmuir, Freundlich, and Temkin isotherm models were employed to interpret the adsorption behavior. The results indicated that the equilibrium data were perfectly represented by the Temkin isotherm. The maximum adsorption capacity of SMS reached 63.5 mg g -1 at 303 K. The kinetics studies indicated that the pseudo-second-order model best described the adsorption of MB on SMS. The activation energy of the adsorption was 5.64 kJ mol -1 . Thermodynamic parameters suggested that the adsorption was an exothermic and spontaneous physical process. The results imply that SMS is a potentially low-cost adsorbent for treating wastewater containing cationic dyes.

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“…The regression coefficients are only between 0.90 and 0.99 (as shown in Table 1). The n values, in the range 0.1 to 1, indicated the adsorptions were favorable [26]. Therefore, it can be concluded the bond energies increased with surface density increasing.…”

Section: Figure 5 Adsorption Isotherms For Cu(ii) Fitted By Langmuirmentioning

confidence: 90%

“…When n is equal to 1, the bond energies does not depend on the surface density, and all surface sites are equivalent. Thus, if n between 1 and 10, it is beneficial for sorption [26].…”

Section: Isotherm Models Investigationsmentioning

confidence: 99%

Copper (II) Removed from Aqueous Solutions by Aminated Bagasse Pith

Liu¹,

Nie²,

Wang³

2016

JRST

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ABSTRACT:The paper investigated the heavy metal ions adsorption by bio-adsorbent obtained from modifying bagasse pith. The bagasse pith, a main solid bio-waste from sugar and pulp industry, was treated by epichlorohydrin and diethylenetriamine. The pith before and after modification were analyzed to characterize its structure change by Fourier Transform Infrared Spectroscopy and Scanning Electron Microscope. It shown that numbers of minor fragments cohere to the surface of fibrous bundle of modified pith. The carboxyl groups has been introduced with the change of substitutional groups in aromatic skeletal of lignin on surface of pith. The kinetics and thermo-dynamic properties were studied. The results shown the adsorption process are well described by Langmuir isotherm and pseudo-2nd order model. It is considered that the bagasse pith, a renewable bio-waste, would be modified to treat the waste water polluted by heavy metal in further studies.

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Cellulosic Substrates for Removal of Pollutants From Aqueous Systems: A Review. 2. Dyes

Cited by 116 publications

References 1,260 publications

Effect of Particle Size on the Sorption of Lead from Water by Different Species of Sawdust: Equilibrium and Kinetic Study

Effect of Particle Size on the Sorption of Lead from Water by Different Species of Sawdust: Equilibrium and Kinetic Study

Adsorptive Removal of Methylene Blue from Aqueous Solution by Spent Mushroom Substrate: Equilibrium, Kinetics, and Thermodynamics

Copper (II) Removed from Aqueous Solutions by Aminated Bagasse Pith

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