pH-Sensitive Nanocomposite Hydrogels Based on Poly(Vinyl Alcohol) Macromonomer and Graphene Oxide for Removal of Cationic Dyes from Aqueous Solutions

Rabipour, Mina; Pour, Zahra Sekhavat; Sahraei, Razieh; Ghaemy, Mousa; Jazi, Mehdi Erfani; Mlsna, Todd

doi:10.1007/s10924-019-01625-6

Cited by 31 publications

(9 citation statements)

References 38 publications

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“…%, regardless of the processing conditions, swelling ratios of the samples were generally increased. A similar trend was reported by Li et al [25] and Rabipour et al [27] The facilitation of water diffusion explained this in terms of polar groups such as carboxyl groups in GO and the decreased crystallinity of the PVA matrix. In contrast, Fu et al [2] have reported the opposite results interpreted based on the immobilization of PVA chains caused by the formation of cross-linking H-bonds between PVA and GO interfaces.…”

Section: Swelling Ratio and Porositysupporting

confidence: 87%

An Eco‐Friendly Polyvinyl Alcohol/Graphene Oxide‐Based Hydrogel as a Methylene Blue Adsorbent

2022

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Recently, hydrogels have been introduced for wastewater treatments as eco‐friendly and efficient adsorbents. Polyvinyl alcohol (PVA)‐based hydrogel reinforced with graphene oxide (GO) can be used for methylene blue (MB) removal from water. PVA/GO hydrogels (5 wt. % PVA and 0.5–2 wt. % GO) were prepared via the freeze‐thaw method, and the effect of GO weight percentage, freezing time, and cycle numbers were investigated. Regarding the results, the composite containing 1 wt. % GO, prepared by six‐hour freezing, and five cycles of freeze‐thawing, had the highest compressive strength (1.6±0.1 MPa) among the studied samples. Furthermore, by adding aloe vera to the PVA/GO composite containing 2 wt. % GO, the removal efficiency of MB was increased from 96 % to 99 % after 72 h, although the surface area was decreased from 31.6 m2 g−1 to 3.9 m2 g−1. Adsorption investigations were also highlighted PVA/GO and PVA/GO/aloe vera hydrogel composites follow the pseudo‐second‐order kinetics and Langmuir isotherm models.

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Section: Swelling Ratio and Porositysupporting

confidence: 87%

An Eco‐Friendly Polyvinyl Alcohol/Graphene Oxide‐Based Hydrogel as a Methylene Blue Adsorbent

2022

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“…From the figure, we found that by raising the irradiation dose (from 10 to 40 kGy), the gel % decreases with increasing the GO content. This is attributed to the fact that the dispersion of GO in the polymer matrix decreases the crosslinking density which limited interaction between PVA and AMPS leading to a decrease in gel % values 45 . Besides, the gel % of the GO/PAMPS/PVA composite hydrogels at 5 kGy was difficult to estimate because these composite hydrogels dissolved in water due to its formed by the physical entanglement only.…”

Section: Resultsmentioning

confidence: 99%

“…This is attributed to the fact that the dispersion of GO in the polymer matrix decreases the crosslinking density which limited interaction between PVA and AMPS leading to a decrease in gel % values. 45 Besides, the gel % of the GO/PAMPS/PVA composite hydrogels at 5 kGy was difficult to estimate because these composite hydrogels dissolved in water due to its formed by the physical entanglement only. Furthermore, when GO was incorporated into the composite network structure, no noticeable increase in gelation percent was observed as GO concentration in the feed mixture was increased.…”

Section: Gel (%) Of Pamps/pva Composite Hydrogelsmentioning

confidence: 99%

Radiation synthesis of graphene oxide/composite hydrogels and their ability for potential dye adsorption from wastewater

Gad

Nasef

2021

J of Applied Polymer Sci

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A high yield of graphene oxide (GO) was chemically synthesized from graphite powder utilizing adjusted Hummer's method. The contents of acidic functional groups in GO were determined using potentiometric titration. Composite hydrogels dependent on graphene oxide/poly(2‐acrylamido‐2‐methylpropanesulfonic acid)/polyvinyl alcohol (GO/PAMPS/PVA) were synthesized utilizing a 60Co gamma irradiation source at different doses. The synthesized graphene oxide and composite hydrogels were portrayed via X‐ray diffraction, thermogravimetric analysis, and Fourier transform infrared analysis. The morphology of composite hydrogels was characterized by scanning electron microscope. The gel % and swelling % for the prepared hydrogel demonstrated that the swelling % of hydrogel increased with raising AMPS content. Whereas the increment of GO and increasing the irradiation dose lead to a reduction in the swelling %. The influences of pH, GO percentage, initial dye concentration, the adsorbent dosage, contact time, and temperature on the adsorption of basic blue 3 dye were evaluated and the adsorption capacity was 194.6 mg/g at optimum conditions; pH = 6, GO/PAMPS/PVA composite hydrogels with 5 wt% of GO, initial dye concentration = 200 mg/L, adsorbent dose = 0.1 g, solution volume = 50 mL after 360 min at room temperature (25°C). The adsorption of dye onto the GO/PAMPS/PVA composite hydrogels follows Pseudo‐second‐order adsorption kinetics, fits the Freundlich adsorption isotherm model.

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“…In addition, hydrogels have the advantage of being cheap, non-toxic, chemically and physically stable, forming a good polymer network, and ability to recycle [11,12]. Hydrogels exhibit a high adsorption affinity to remove different chemicals from aqueous solutions even at lower concentrations, which makes them important for widespread use in environmental applications [13,14]. Common functional groups used in the synthesis of hydrogels include carboxylic acids, amides, amines, hydroxyl, and sulfonic acids.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of methyl violet dye from wastewater using poly(methacrylic acid-co-acrylamide)/bentonite nanocomposite hydrogels

et al. 2022

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One of the major environmental problems is the entry of colored pollutants into the oceans and seas. Adsorption is one of the effective methods to eliminate colorant polluting materials from wastewater streams. In this study, nanocomposite hydrogels of poly(methacrylic acid-co-acrylamide) (Poly(MAA-co-AAm)) containing different weight percent bentonite clay nanoparticles (0, 5, 10, and 15 wt. %) were used to remove methyl violet (MV) dye. FTIR, SEM, TGA, and XRD were used to analyze the properties of adsorbents. Results showed that bentonite nanoparticles were successfully distributed in the hydrogel system. Bentonite nanoparticles at 10 wt. % gave the maximum MV dye adsorption efficiency. The highest adsorption was obtained at a pH of 5, an adsorbent dosage of 1.5 g/L, a temperature of 25°C, a contact time of 60 min, and a pollutant concentration of 10 mg/L. In thermodynamics studies, a negative values of Gibbs free energy (ΔG°) indicating that the adsorption process was spontaneous. In addition, Poly(MAA-co-AAm) hydrogels and Poly(MAA-co-AAm)/bentonite nanocomposite hydrogels gave the adsorption enthalpy (ΔH°) of 22.2 and 47.4 KJ/mol. Langmuir isotherm model was successfully applied in describing the equilibrium behavior of the adsorption process. To investigate the adsorption kinetics, we used pseudofirst-order, pseudo-second-order, and Elovich models. The kinetic study showed that the pseudo-secondorder model was more successful in describing the kinetic behavior of the adsorption process than pseudofirst-order and Elovich models. Incorporating bentonite clay nanoparticles in Poly(MAA-co-AAm) nanocomposite hydrogels significantly improved the adsorption and swelling efficiencies of these hydrogels.

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pH-Sensitive Nanocomposite Hydrogels Based on Poly(Vinyl Alcohol) Macromonomer and Graphene Oxide for Removal of Cationic Dyes from Aqueous Solutions

Cited by 31 publications

References 38 publications

An Eco‐Friendly Polyvinyl Alcohol/Graphene Oxide‐Based Hydrogel as a Methylene Blue Adsorbent

An Eco‐Friendly Polyvinyl Alcohol/Graphene Oxide‐Based Hydrogel as a Methylene Blue Adsorbent

Radiation synthesis of graphene oxide/composite hydrogels and their ability for potential dye adsorption from wastewater

Adsorption of methyl violet dye from wastewater using poly(methacrylic acid-co-acrylamide)/bentonite nanocomposite hydrogels

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