Enhanced sorption of methylene blue from aqueous solutions by semi-IPN composite cryogels with anionically modified potato starch entrapped in PAAm matrix

Drăgan, Ecaterina Stela; Loghin, Diana Felicia Apopei

doi:10.1016/j.cej.2013.08.081

Cited by 109 publications

(58 citation statements)

References 59 publications

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“…Within 30 minutes in the dark, the adsorption of As(III) on g-Fe 2 O 3 @-PANI@TiO 2 reached up to 90% of the total adsorption quantity, and the rate became slow aer 60 minutes with the active hydroxy and amino adsorption sites on the surface being occupied. By tting the adsorption data with the pseudo-rstorder (PFO) and pseudo-second-order (PSO) kinetics model 46,48 (Table S3 †), the PSO model was found to be better with the corresponding non-linear tting coefficient of Chi-square (c 2 ) being as low as 0.970 Â 10 À6 and the corresponding R 2 being 0.996. Therefore, the adsorption process of As(III) onto g-Fe 2 -O 3 @PANI@TiO 2 is classied as chemical adsorption.…”

Section: Resultsmentioning

confidence: 99%

A magnetic γ-Fe₂O₃@PANI@TiO₂ core–shell nanocomposite for arsenic removal via a coupled visible-light-induced photocatalytic oxidation–adsorption process

Wang

Zhang

et al. 2020

Nanoscale Adv.

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Section: Resultsmentioning

confidence: 99%

A magnetic γ-Fe₂O₃@PANI@TiO₂ core–shell nanocomposite for arsenic removal via a coupled visible-light-induced photocatalytic oxidation–adsorption process

Wang

Zhang

et al. 2020

Nanoscale Adv.

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“…[31][32][33] The presence of CTS shells enables adsorption application in aqueous environment. When the core-shell beads and pure CTS beads (control sample) were placed in a methyl orange (MO) solution, those beads quickly became wetting to water, and sank into the solution.…”

Section: Sorption Resultsmentioning

confidence: 99%

Highly Porous Core–Shell Structured Graphene-Chitosan Beads

Ouyang

Wang

et al. 2015

ACS Appl. Mater. Interfaces

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Graphene oxide (GO) sheets have been assembled into various three-dimensional porous structures and composites, with potential applications in energy and environmental areas. Here, we show the combination of GO and chitosan (CTS) into inorganic-organic heterocomposites as ∼3 mm diameter core-shell beads with controlled microstructure. The spherical GO-CTS beads, made by a two-step freeze-casting method, consist of a GO core wrapped by a CTS shell with abrupt interface; both parts have high porosities (94-96%) and mesopores volume (0.246 cm(3)/g) yet with different pore morphologies. Incorporation of a GO core into the CTS beads significantly improved the methyl orange adsorption capacity (353 mg/g at 318 K) compared with pure CTS beads. Key factors such as the pH value, adsorbent dosage, concentration, time, and temperature have been studied in detail, whereas adsorption isotherm and kinetic studies reveal a Langmuir model following the pseudo-second order.

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“…The Langmuir isotherm model assumes monolayer sorption, where the energy of sorption for each sorbate species is the same and independent of surface coverage. The sorption occurs only on localized sites and involves no interactions between sorbed species [16,[24][25][26][27][28]. The Freundlich isotherm model describes sorption on heterogeneous surfaces where sorption sites have different energies of sorption.…”

Section: Isotherms Modelingmentioning

confidence: 99%

Sorption of cadmium ions from saline waters onto Fe(III)-zeolite

Ahribesh¹,

Lazarević²,

Potkonjak³

et al. 2015

Hem Ind

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The sorption of Cd 2+ from natural seawater, artificial seawater, distilled water and NaCl solution of the same ionic strength as the seawater onto zeolite modified by iron(III) oxide (Fe(III)-zeolite) was investigated. The sorption was found to be time, concentration and pH dependent. The sorption capacity at the initial pH 7 decreased in the following order: distilled water > NaCl solution > artificial seawater > natural seawater. The isotherm study showed that Langmuir isotherm model could be adequately applied for the sorption in distilled water, indicating the homogeneous monolayer coverage at Fe(III)-zeolite surface, while the Freundlich isotherm model showed a better fit than the Langmuir model of the sorption data in saline waters, indicating multilayer heterogeneous coverage at the sorbent surface. The values of Freundlich parameter n suggested that the sorption was a favorable process and bonds between Cd 2+ and Fe(III)-zeolite surface were stronger in NaCl solution than in natural and artificial seawater. Kinetics analysis showed that the mechanism of Cd 2+ sorption from natural seawater differed from the sorption mechanism out of distilled water, NaCl solution and artificial seawater. The intra-particle diffusion kinetic model indicated that both boundary layer diffusion and intra-particle diffusion influenced the rate of sorption.

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Enhanced sorption of methylene blue from aqueous solutions by semi-IPN composite cryogels with anionically modified potato starch entrapped in PAAm matrix

Cited by 109 publications

References 59 publications

A magnetic γ-Fe₂O₃@PANI@TiO₂ core–shell nanocomposite for arsenic removal via a coupled visible-light-induced photocatalytic oxidation–adsorption process

A magnetic γ-Fe₂O₃@PANI@TiO₂ core–shell nanocomposite for arsenic removal via a coupled visible-light-induced photocatalytic oxidation–adsorption process

Highly Porous Core–Shell Structured Graphene-Chitosan Beads

Sorption of cadmium ions from saline waters onto Fe(III)-zeolite

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Enhanced sorption of methylene blue from aqueous solutions by semi-IPN composite cryogels with anionically modified potato starch entrapped in PAAm matrix

Cited by 109 publications

References 59 publications

A magnetic γ-Fe2O3@PANI@TiO2 core–shell nanocomposite for arsenic removal via a coupled visible-light-induced photocatalytic oxidation–adsorption process

A magnetic γ-Fe2O3@PANI@TiO2 core–shell nanocomposite for arsenic removal via a coupled visible-light-induced photocatalytic oxidation–adsorption process

Highly Porous Core–Shell Structured Graphene-Chitosan Beads

Sorption of cadmium ions from saline waters onto Fe(III)-zeolite

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A magnetic γ-Fe₂O₃@PANI@TiO₂ core–shell nanocomposite for arsenic removal via a coupled visible-light-induced photocatalytic oxidation–adsorption process

A magnetic γ-Fe₂O₃@PANI@TiO₂ core–shell nanocomposite for arsenic removal via a coupled visible-light-induced photocatalytic oxidation–adsorption process