Poly(N-isopropylacrylamide-co-acrylic acid) hydrogels for copper ion adsorption: Equilibrium isotherms, kinetic and thermodynamic studies

Chen, J.J.; Ahmad, A.L.; Ooi, B. S.

doi:10.1016/j.jece.2013.05.012

Cited by 117 publications

(48 citation statements)

References 50 publications

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“…Finally, it is shown that in liquid phase there is no relation between heat of adsorption obtained from the Dubinin-Radushkevich isotherm with adsorption binding constant or adsorption enthalpy change and also parameters obtained from BET isotherm for adsorption from liquid phase are meaningless. 2+ onto the PNIPAM-co-A Hydrogels [60].…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

“…Nevertheless, during study of rapid adsorption process, some authors [59] reported data of plateau region rather than data of regions before it, ( Figure 11) and (8) Under alkaline conditions, metal ions participate as metal hydroxide. But, in some cases it was wrongly reported [60] that adsorption capacity …”

Section: Some Experimental Pointsmentioning

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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“…As the CMC-g-PAA hydrogel was loaded with Cu 2+ , the bond energy was altered by the chemical reaction in the adsorption process, which in turn resulted in the decrease of the spectral intensity for the 1710 stretching. This elucidated that Cu 2+ had bound with the AA moieties of the CMC-g-PAA hydrogel (25) . Moreover, the decrease in the intensity of the peak at 3438 cm -1 after Cu 2+ adsorption is an evidence for the binding of Cu 2+ ions to the hydroxyl groups.…”

Section: Effect Of Contact Time On the Adsorption Capacitymentioning

confidence: 96%

Carboxymethyl Cellulose-Graft-Polyacrylic Acid Hydrogel: A Cost Effective and Reusable Adsorbent for Cu2+ .

2015

Egypt. J. Chem.

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“…The characteristic peak at 1734 cm -1 represents the CO stretching vibration in the carboxyl groups of AAc units. The broad peaks at 3300-3400 cm -1 was assigned to water of hydration attached to the hydrogel polymer and COOH group [29][30]. The absorption peaks at 574 and 1018 cm -1 are due to stretching vibration of FeO in Fe 3 O 4 and phthalocyanine cycles, respectively.…”

Section: Characterization Of the Prepared Poly (Nipam-co-aa) Magneticmentioning

confidence: 99%

Fabrication of new Fe-phthalocyanine oligomer–magnetite hybrid magnetic nano particles and their effects on the LCST behavior of thermo-sensitive poly(N-isopropylacrylamide-co-acrylic acid) magnetic nanocomposites

Karimi

Azadikhah

Rahimi

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Poly(N-isopropylacrylamide-co-acrylic acid) hydrogels for copper ion adsorption: Equilibrium isotherms, kinetic and thermodynamic studies

Cited by 117 publications

References 50 publications

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

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

Carboxymethyl Cellulose-Graft-Polyacrylic Acid Hydrogel: A Cost Effective and Reusable Adsorbent for Cu2+ .

Fabrication of new Fe-phthalocyanine oligomer–magnetite hybrid magnetic nano particles and their effects on the LCST behavior of thermo-sensitive poly(N-isopropylacrylamide-co-acrylic acid) magnetic nanocomposites

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