pH responsive adsorption/desorption studies of organic dyes from their aqueous solutions by katira gum-cl-poly(acrylic acid-co-N-vinyl imidazole) hydrogel

Jana, Subinoy; Ray, Jagabandhu; Mondal, Barun; Pradhan, Sitangshu Sekhar; Tripathy, Tridib

doi:10.1016/j.colsurfa.2018.06.001

Cited by 79 publications

(38 citation statements)

References 72 publications

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“…These results are also in agreement with zeta potential value of TA-poly(AN- co -AA) had highest negative surface charge at pH 9. Furthermore, π–π electron donor-acceptor can also improve the adsorption mechanism for phenolic contaminants with strong π-withdrawing potential according to Jana and co-workers [41]. H-bonding and hydrophobic/hydrophilic interaction may also contribute.…”

Section: Resultsmentioning

confidence: 99%

Adsorptive Removal of Methylene Blue from Aquatic Environments Using Thiourea-Modified Poly(Acrylonitrile-co-Acrylic Acid)

et al. 2019

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The paper evaluates the adsorptive potential of thiourea-modified poly(acrylonitrile-co-acrylic acid), (TA-poly(AN-co-AA)) for the uptake of cationic methylene blue (MB) from aquatic environments via a batch system. TA-poly(AN-co-AA) polymer was synthesized through redox polymerization and modified with thiourea (TA) where thioamide groups were introduced to the surface. Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), CHNS and Zetasizer were used to characterize the physico-chemical and morphological properties of prepared TA-poly(AN-co-AA). Afterwards, it was confirmed that incorporation of thioamide groups was successful. The adsorption kinetics and equilibrium adsorption data were best described, respectively, by a pseudo-second-order model and Freundlich model. Thermodynamic analysis showed the exothermic and spontaneous nature of MB uptake by TA-poly(AN-co-AA). The developed TA-poly(AN-co-AA) polymer demonstrated efficient separation of MB dye from the aqueous solution and maintained maximum adsorption capacity after five regeneration cycles. The findings of this study suggested that synthesized TA-poly(AN-co-AA) can be applied successfully to remove cationic dyes from aquatic environments.

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Section: Resultsmentioning

confidence: 99%

Adsorptive Removal of Methylene Blue from Aquatic Environments Using Thiourea-Modified Poly(Acrylonitrile-co-Acrylic Acid)

et al. 2019

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“…Alternatively, cationic hydrogels undergo swelling at a pH lower than p K a , and deswelling when the pH goes higher than p K a . Monomers with carboxylic groups including AAc, methacrylic acid (MAAc), or carboxymethylagarose and their copolymers are common constituents of anionic hydrogels. Cationic hydrogels have monomers with amine and amide groups such as AAm, dimethylaminoethyl methacrylate (DMAEMA), and 2‐(diethylamino)ethyl methacrylate (DEAEMA), and their copolymers.…”

Section: Principlesmentioning

confidence: 99%

Transformer Hydrogels: A Review

Erol

Pantula

Liu

et al. 2019

Adv Materials Technologies

235

211

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Hydrogels, which are hydrophilic soft porous networks, are an important class of materials of broad relevance to bioanalytical chemistry, soft‐robotics, drug delivery, and regenerative medicine. Transformer hydrogels are micro‐ and mesostructured hydrogels that display a dramatic transformation of shape, form, or dimension with associated changes in function, due to engineered local variations such as in swelling or stiffness, in response to external controls or environmental stimuli. This review describes principles that can be utilized to fabricate transformer hydrogels such as by layering, patterning, or generating anisotropy, and gradients. Transformer hydrogels are classified based on their responsivity to different stimuli such as temperature, electromagnetic fields, chemicals, and biomolecules. A survey of the current research progress suggests applications of transformer hydrogels in biomimetics, soft robotics, microfluidics, tissue engineering, drug delivery, surgery, and biomedical engineering.

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“…The results indicate that the removal efficiency increases first and then decreases as the temperature is raised further, reaching a maximum at 318 K. The higher the temperature, the more feasibly and quickly the dye molecules diffuse into the hydrogel network, leading to the increase of the adsorption capacity. However, increase in temperature would also enhance the tendency of the dye desorption from the hydrogels . As a result, when the temperature elevated over 318 K, the removal efficiency of the dyes decreases instead.…”

Section: Resultsmentioning

confidence: 99%

Robust, recoverable poly(N,N‐dimethylacrylamide)‐based hydrogels crosslinked by vinylated chitosan with recyclable adsorbability for acid red

Wang

Xing

Zhao

et al. 2019

J of Applied Polymer Sci

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To seek adsorptive hydrogels with high stability, poly(N,N-dimethylacrylamide) (PDMAM)-based hydrogels were fabricated employing vinylated chitosan as a macro-crosslinker. The prepared hydrogels achieves a maximum compressive stress above 11 MPa (98% strain), a maximum tensile strength, and fracture elongation of 0.037 MPa and 929%. The recovery ratios after three consecutive compressions (90% strain) and 1 h's resting (600% stretch) exceed 94% and 85%, respectively. The optimal adsorption effect (>90% removal efficiency) is achieved at pH 3 and 318 K in 2.5 h using hydrogels crosslinked by 9.77 wt % chitosan. The kinetic study indicates that the experimental data fit to the pseudo-second-order kinetic model better. The adsorption isotherm fits to the Freundlich model, indicating nonhomogeneous adsorption of the dyes on the hydrogels. Most adsorbed dyes are desorbed in 2 h at pH 10 and 318 K, both adsorption/desorption efficiencies exceed 90% after five adsorption-desorption cycles, confirming reusability of the hydrogels.Recently, hydrogels have attracted special attention for the adsorptive removal of pollutants in wastewater due to their unique physical and chemical characteristics and diversity. [23][24][25][26] Hydrogels are porous, three-dimensional (3D) polymeric networks that hold a large amount of water. The water absorbency mainly attributes to the numerous hydrophilic groups (e.g., hydroxyl, amino, carboxyl, amide, sulfo) existing in the network, which also contribute to the adsorptive removal of aqueous pollutants. 27 The pollutants can be adsorbed onto both the outer surface and inner network of the swollen, 3D hydrogels. The adsorption occurs mostly through Additional Supporting Information may be found in the online version of this article.

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pH responsive adsorption/desorption studies of organic dyes from their aqueous solutions by katira gum-cl-poly(acrylic acid-co-N-vinyl imidazole) hydrogel

Cited by 79 publications

References 72 publications

Adsorptive Removal of Methylene Blue from Aquatic Environments Using Thiourea-Modified Poly(Acrylonitrile-co-Acrylic Acid)

Adsorptive Removal of Methylene Blue from Aquatic Environments Using Thiourea-Modified Poly(Acrylonitrile-co-Acrylic Acid)

Transformer Hydrogels: A Review

Robust, recoverable poly(N,N‐dimethylacrylamide)‐based hydrogels crosslinked by vinylated chitosan with recyclable adsorbability for acid red

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