Preparation of nanocomposite hydrogels with nanoclay: characterization, swelling properties and dye adsorption behavior

MIL-68(Al), a powdered aluminum-based metal organic framework (MOF), was synthesized and used to explore its adsorption behavior toward methyl orange (MO). The adsorption isotherm, thermodynamics, kinetics, and some key operating factors as well as changes in the material's structure were investigated. The adsorption isotherm conformed to the Langmuir isotherm model and the maximum equilibrium adsorption capacity was 341.30 mg g−1. Thermodynamic data demonstrated that the adsorption process was spontaneous, endothermic and showed positive entropy. For kinetics, the process of MO adsorption onto MIL-68(Al) was more suitably described by a pseudo-second-order model. Electrostatic and hydrogen-bonding interactions contributed to dye adsorption, with electrostatic interactions considered to be the principal binding force between adsorbent and adsorbate. Furthermore, MIL-68(Al) maintained a stable structure after adsorption. From these results, MIL-68(Al) was suggested here to be a stable MOF adsorbent for removing MO from aqueous solution.

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Facile Preparation of Mesoporous Carbon Microspheres Containing Nickel Nanoparticle and Dye Adsorption Behavior

Science of Advanced Materials ◽

10.1166/sam.2015.2006 ◽

2015 ◽

Vol 7 (1) ◽

pp. 43-49 ◽

Cited By ~ 2

Author(s):

Xiufang Wang ◽

Ailin Huang ◽

Suni Zhong ◽

Yufang Pan ◽

Yong Tian

Keyword(s):

Mesoporous Carbon ◽

Dye Adsorption ◽

Adsorption Behavior ◽

Carbon Microspheres ◽

Nickel Nanoparticle ◽

Facile Preparation

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Effect of Different Surface-charged Lamellar Materials on Swelling Properties of Nanocomposite Hydrogels

10.21203/rs.3.rs-255558/v1 ◽

2021 ◽

Author(s):

Marcela Pfeifer ◽

Flávio A. C. Andrade ◽

Ricardo Bortoletto-Santos ◽

Fauze A. Aouada ◽

Caue Ribeiro

Keyword(s):

Water Absorption ◽

Anomalous Behavior ◽

Absorption Capacity ◽

Water Absorption Capacity ◽

Swelling Properties ◽

Ph Variation ◽

Nanocomposite Hydrogels ◽

Thermally Activated ◽

Different Temperatures ◽

Lamellar Materials

Abstract This study investigated the effect of different surface-charged lamellar materials on the swelling and diffusion properties of synthesized polyacrylamide-methylcellulose hydrogels (HG). Montmorillonite and hydrotalcite thermally activated at two different temperatures (300 and 550 ºC) were incorporated in the preparation of nanocomposite (NC) hydrogels. A series of NC hydrogels were prepared by varying the lamellar material content (1:1, 2:1 and 4:1). The results showed that the HG with hydrotalcite (550 ºC) was strongly dependent on the ionic intensity, and that the swelling degree increased by 50%, 65% and 78% with reducing the hydrotalcite content at (1:1), (2:1) and (4:1), respectively. The water absorption capacity of HG containing montmorillonite or hydrotalcite (300 ºC) was slightly affected when the pH decreased from 7 to 3. However, the pH variation from 7 to 10 increased the water absorption capacity of most HG, except those containing hydrotalcite (550 ºC) at (2:1) and (4:1). The presence of lamellar nanoparticles in hydrogels made the polymer matrix more rigid, and less likely to absorb water. In contrast, HG with hydrotalcite (550 ºC) at (2:1) and (4:1) showed anomalous behavior with an increase in their water absorption capacity. The results support that the developed NC-HG can be suitable candidates for applications as controlled released materials.

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New multifunctional 3D porous metal–organic framework with selective gas adsorption, efficient chemical fixation of CO2 and dye adsorption

Dalton Transactions ◽

10.1039/c9dt01249d ◽

2019 ◽

Vol 48 (22) ◽

pp. 7612-7618 ◽

Cited By ~ 16

Author(s):

Shan Cheng ◽

Yunlong Wu ◽

Jing Jin ◽

Jiao Liu ◽

Dan Wu ◽

...

Keyword(s):

Storage Capacity ◽

Gas Adsorption ◽

Metal Organic Framework ◽

Dye Adsorption ◽

Porous Metal ◽

Adsorption Behavior ◽

Chemical Fixation ◽

Efficient Catalyst ◽

Metal Organic ◽

Rapid Adsorption

A new porous Mn(ii)-based MOF was obtained. The studies indicated it exhibits an effective storage capacity for CO2, highly efficient catalyst behavior for epoxides with different substituents and rapid adsorption behavior of different dyes.

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Preparation of Multicomponent Biocomposites and Characterization of Their Physicochemical and Mechanical Properties

Journal of Composites Science ◽

10.3390/jcs4010018 ◽

2020 ◽

Vol 4 (1) ◽

pp. 18

Author(s):

Yuriy A. Anisimov ◽

Duncan E. Cree ◽

Lee D. Wilson

Keyword(s):

Mechanical Properties ◽

Electrical Conductivity ◽

Physicochemical Properties ◽

In Situ Polymerization ◽

Structural Parameters ◽

Dye Adsorption ◽

Mechanical Analysis ◽

Scanning Calorimetry ◽

Swelling Properties

This work focused on a mutual comparison and characterization of the physicochemical properties of three-component polymer composites. Binary polyaniline–chitosan (PANI–CHT) composites were synthesized by in situ polymerization of PANI onto CHT. Ternary composites were prepared by blending with a third component, polyvinyl alcohol (PVA). Composites with variable PANI:CHT (25:75, 50:50 and 75:25) weight ratios were prepared whilst fixing the composition of PVA. The structure and physicochemical properties of the composites were evaluated using thermal analysis (thermogravimetric analysis (TGA), differential scanning calorimetry (DSC)) and spectroscopic methods (infrared (IR), nuclear magnetic resonance (NMR)). The equilibrium and dynamic adsorption properties of composites were evaluated by solvent swelling in water, water vapour adsorption and dye adsorption isotherms. The electrical conductivity was estimated using current–voltage curves. The mechanical properties of the samples were evaluated using dynamic mechanical analysis (DMA) and correlated with the structural parameters of the composites. The adsorption and swelling properties paralleled the change in the electrical and mechanical properties of the materials. In most cases, samples with higher content of chitosan exhibit higher adsorption and mechanical properties, and lower conductivity. Acid-doped samples showed much higher adsorption, swelling, and electrical conductivity than their undoped analogues.

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