Adsorption-desorption characteristic of thermo-magneto-responsive poly(N-isopropylacrylamide)-co-acrylic acid composite hydrogel towards chromium (III) ions

Chen, J.J.; Ahmad, Akil; Lim, JitKang; Ooi, Boon Seng

doi:10.1016/j.jwpe.2019.100957

Cited by 17 publications

(11 citation statements)

References 56 publications

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“…However, mild temperature conditions can also be efficient for regeneration of more delicate materials, like hydrogels. It has been reported that the use of thermal regeneration a thermo-magneto-responsive poly( N -isopropylacrylamide)- co -acrylic acid composite loaded with Cr 3+ reached complete desorption at 50 °C . According to the authors, desorption in this composite system was largely attributed to the enthalpy-driven dissociation of hydrated Cr 3+ from the hydrogel surface once the medium cooled to room temperature.…”

Section: Desorption Methods/regeneration Strategiesmentioning

confidence: 99%

Desorption Strategies and Reusability of Biopolymeric Adsorbents and Semisynthetic Derivatives in Hydrogel and Hydrogel Composites Used in Adsorption Processes

Alcalde-Garcia,

Prasher,

Kaliaguine

et al. 2023

ACS Eng. Au

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Adsorption is a promising technique for the removal of persistent contaminants, since it is a relatively cheap process with low energy requirements and does not produce secondary contamination. However, the large-scale implementation of an adsorption process usually involves a dual column process for either pressure swing or temperature swing operations. Therefore, the reusability of adsorbents is a key characteristic to consider and evaluate but is often overlooked during the development of new materials. To be reused, the adsorbent should successfully release the contaminant by a desorption or regeneration step without compromising the chemical and physical stability of the matrix. The efficiency of desorption/regeneration methods depends greatly on the chemical characteristics of the contaminants, the nature of the adsorbents, and the adsorption mechanisms responsible for the adsorbent−adsorbate interactions. This review focuses on the desorption strategies that have been used for the regeneration of biobased hydrogels and hydrogel composites, materials that have been successfully applied in the adsorption of wastewater contaminants. The strategies can be divided into chemical and physical methods. The chemical methods include the use of desorption agents, photocatalytic oxidation, and CO 2 bubbling; and the physical methods include thermal and ultrasonic treatments. These regeneration strategies have shown different efficiencies as well as specific advantages and drawbacks that need to be considered to select the most suitable method for a specific application.

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Section: Desorption Methods/regeneration Strategiesmentioning

confidence: 99%

Desorption Strategies and Reusability of Biopolymeric Adsorbents and Semisynthetic Derivatives in Hydrogel and Hydrogel Composites Used in Adsorption Processes

Alcalde-Garcia,

Prasher,

Kaliaguine

et al. 2023

ACS Eng. Au

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“…As the temperature changes, Cr 3+ ions in the PNIPAM matrix remain unaffected by the swelling–shrinking behavior of the hydrogel. The adsorption of Cr 3+ can mainly be attributed to the precipitation of Cr 3+ hydroxy species on the hydrogel surface bound by the carboxylates (−COO – ) of the AA moiety and amides to form metal–ligand surface complexes . Further separation and removal of chromium were then conducted under the influence of a low-gradient magnetic field.…”

Section: Dual- and Multi-sriasmentioning

confidence: 99%

“…(b) Mechanism for Cr 3+ ion adsorption by (PNIPAM-co-AA)-silica-PVP-MNP hydrogels, in which the surface adsorption of Cr 3+ is dominant as more inner hydrogen bonds were formed within the hydrogel network. 121 Copyright 2019, Elsevier. (c) Schematic illustration of the P-ESIX system.…”

Section: Dual-and Multi-sriasmentioning

confidence: 99%

Stimuli-Responsive Ion Adsorbents for Sustainable Separation Applications

Li,

Hou,

et al. 2023

ACS Nano

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“…At present, some simple methods have been proposed to prepare high‐performance hydrogels with multiple responses 11‐14 . Poly( N ‐isopropylacrylamide) (PNIPAM) is a unique temperature‐responsive hydrogel, the typical temperature‐sensitive hydrogel has been extensively studied for its reversible temperature response 15‐18 . The temperature response property contrary to the normal phenomenon makes the intelligent hydrogel have great application potential.…”

Section: Introductionmentioning

confidence: 99%

Preparation of multifunctional hydrogels with pore channels using agarose sacrificial templates and its applications

Mao

Wang

2021

Polymers for Advanced Techs

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Smart hydrogel has been widely studied due to their unique response characteristics. Although many smart hydrogels have been developed, the preparation of high‐performance and multi‐responsive smart hydrogels remains a challenge. The application of developing new materials is also the valuable embodiment of materials, such as temperature sensors, thermal switches and anionic dye adsorption. In this study, poly(N‐isopropylacrylamide) (PNIPAM) hydrogel with pore channels was prepared using agarose as a sacrificial template, and a polyaniline network structure was introduced into hydrogel pore channels to endow the hydrogels with stable conductivity. This point can be confirmed by the Fourier transform infrared spectroscopy and scanning electron microscopy images of hydrogels. The decomposition temperature of hydrogels characterized by thermogravimetric analysis. Thermal response analysis and electrical performance testing found that PNIPAM hydrogel with pore channels exhibited enhanced temperature‐responsive swelling‐shrinkage properties and high conductivity (1.83 S m−1). Based on this unique property, we demonstrated the application of materials in thermal switching (response temperature ~33°C) and can be potentially applied to the temperature sensor and anionic dye adsorption.

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Adsorption-desorption characteristic of thermo-magneto-responsive poly(N-isopropylacrylamide)-co-acrylic acid composite hydrogel towards chromium (III) ions

Cited by 17 publications

References 56 publications

Desorption Strategies and Reusability of Biopolymeric Adsorbents and Semisynthetic Derivatives in Hydrogel and Hydrogel Composites Used in Adsorption Processes

Desorption Strategies and Reusability of Biopolymeric Adsorbents and Semisynthetic Derivatives in Hydrogel and Hydrogel Composites Used in Adsorption Processes

Stimuli-Responsive Ion Adsorbents for Sustainable Separation Applications

Preparation of multifunctional hydrogels with pore channels using agarose sacrificial templates and its applications

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