Eco-friendly polyvinyl alcohol/carboxymethyl cellulose hydrogels reinforced with graphene oxide and bentonite for enhanced adsorption of methylene blue

Dai, Hongjie; Ying, Huang; Huang, Huihua

doi:10.1016/j.carbpol.2017.12.073

Cited by 414 publications

(113 citation statements)

References 54 publications

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“…A competent and effective adsorbent with not only excellent adsorption efficiency was required for the contaminants but also efficient reusability efficiency was predictable that may reduce the total price of the adsorbents [66,74]. The desorption experiments were performed at room temperature for four cycles and results are shown in Figure 16.…”

Section: Regeneration Of Opb/mwcnts Reinforced Pva Hydrogelmentioning

confidence: 99%

Efficient Removal of Pb(II) from Aqueous Solutions by Using Oil Palm Bio-Waste/MWCNTs Reinforced PVA Hydrogel Composites: Kinetic, Isotherm and Thermodynamic Modeling

et al. 2020

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Polyvinyl alcohol (PVA) hydrogel are still restricted for some applications because their lower mechanical strength and thermal stability. The PVA-based composites are drawing attention for the removal of heavy metals based on their specific functionality in adsorption process. The main objective of this work is to synthesize oil palm bio-waste (OPB)/multiwalled carbon nanotubes (MWCNTs) reinforced PVA hydrogels in the presence of N,N′-methylenebisacrylamide (NMBA) as a crosslinking agent and ammonium persulfate (APS) as an initiator via simple in-situ polymerization technique. The as-prepared reinforced nanocomposites were characterized by FESEM, BET surface area, differential scanning calorimetry (DSC), TGA and FTIR analysis. The possible influence of OPB and MWCNTs on the tensile strength, elongation at break and elastic modulus of the samples were investigated. It was found that reinforced nanocomposites exhibited enhanced mechanical properties as compared to non-reinforced material. The evaluation of reinforced nanocomposites was tested by the removal of Pb(II) aqueous solutions in a batch adsorption system. The pseudo-second-order kinetic model was used to illustrate the adsorption kinetic results and Langmuir isotherm was more suitable to fit the equilibrium results providing maximum adsorption capacities. The evaluation of thermodynamic parameters describes the spontaneous, endothermic and chemisorption adsorption process while activation energy reveals the physical adsorption mechanism. Therefore, the coordination effects among OPB, MWCNTs and PVA polymer hydrogels can produce a promising adsorbent material for wastewater treatment applications.

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Section: Regeneration Of Opb/mwcnts Reinforced Pva Hydrogelmentioning

confidence: 99%

Efficient Removal of Pb(II) from Aqueous Solutions by Using Oil Palm Bio-Waste/MWCNTs Reinforced PVA Hydrogel Composites: Kinetic, Isotherm and Thermodynamic Modeling

et al. 2020

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“…(2) Figure 1 shows the FTIR spectra of PVA, CMC, P/C, P/N, P/C/N, and Na 2 CO 3 . For pure PVA, the peaks at 3588 cm −1 and 1330 cm −1 were assigned to OH stretching and bending vibrations for PVA film [21,22]. The peak corresponding to methylene group (CH 2 ) asymmetric stretching vibration appeared at −2932 cm −1 [23].…”

Section: Water Sorptionmentioning

confidence: 99%

Effect of Na2CO3 on the Microstructure and Macroscopic Properties and Mechanism Analysis of PVA/CMC Composite Film

Zhu

Che³

et al. 2020

Polymers

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Polyvinyl alcohol (PVA)/carboxyl methyl cellulose sodium (CMC)/Na2CO3 composite films with different contents of Na2CO3 were prepared by blending and solution-casting. The effect of Na2CO3 on the microstructure of PVA/CMC composite film was analyzed by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC), and atomic force microscopy (AFM). Its macroscopic properties were analyzed by water sorption, solubility, and dielectric constant tests. The results show that the microstructure of PVA/CMC/Na2CO3 composite films was different from that of PVA and PVA/CMC composite films. In addition, compared to PVA and PVA/CMC composite films, the water sorption of PVA/CMC/Na2CO3 composite films relatively increased, the solubility in water significantly decreased, and the dielectric properties significantly improved. All these results indicate that the hydrogen bonding interaction between PVA and CMC increased and the crystallinity of PVA decreased after the addition of Na2CO3. This was also a direct factor leading to increased water sorption, decreased solubility, and enhanced dielectric properties. The reaction mechanism of PVA, CMC, and Na2CO3 is proposed to further evaluate the effect of Na2CO3 on the microstructure and macroscopic properties of PVA/CMC/Na2CO3 composite films.

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“…For instance, a high capacity of 436 mg·g −1 toward Cr(VI) anions has been reported [25]. Both GO [29,30] and GO-containing composites (based on calcium alginate [31] or natural polysaccharides [32][33][34][35]) can by applied to removal of cationic dyes from water. Exponential increase of dye uptake with oxidation degree of GO [29] indicates main contribution of its hydrophilic regions to adsorption.…”

Section: Introductionmentioning

confidence: 99%

Composite adsorbents including oxidized graphene: effect of composition on mechanical durability and adsorption of pesticides

Dzyazko¹,

Ogenko²,

Shteinberg³

et al. 2019

Him. Fiz. Tehnol. Poverhni

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A number of multifunctional composite adsorbents based on hydrated zirconium dioxide has been synthesized. The inorganic ion exchanger contained nanosheets of oxidized graphene (GO), the modifier amount was 0.5-7 mass. %. The composites were investigated with methods of transmission electron microscopy and nitrogen adsorption-desorption, macropores were determined using water as a working liquid. It has been found that increasing of GO content depresses microporosity, but meso-and macroporosity grow. Crushing strength reduces exponentially with increase of total pore volume from 0.49 to 0.62 cm 3 g -1 . Removal of phenol from water containing also inorganic ions was investigated. Adsorption capacity reaches 0.15-0.85 (phenol), 0.5-0.85 (Ca 2+ and Mg 2+ ), 0.005-0.045 (SO 4 2-) mmol g -1 . When the GO content in the composites is 0.5-2 %, this carbon addition improves adsorption of cations and organic molecules comparing with hydrated zirconium dioxide. Further increase in GO amount causes no sufficient effect on adsorption due to decline of specific surface area of the composites. It has been suggested that the optimal content of the modifier, which provides the maximal growth of adsorption capacity, is 2 %. This composite is obtained in a form of large granules (0.3-0.5 mm), their crushing strength is 9 bar. The material was applied to removal of pesticides (acetomipride, carboxine, epoxyconazole and thiamethoxam) from aqueous multicomponent solution under batch conditions. The residual content of carboxine and epoxyconazole, molecules of which contain benzene rings, is lower than the maximal allowable concentration. No deterioration of pesticide uptake has been found after five cycles of adsorption-regeneration.

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Eco-friendly polyvinyl alcohol/carboxymethyl cellulose hydrogels reinforced with graphene oxide and bentonite for enhanced adsorption of methylene blue

Cited by 414 publications

References 54 publications

Efficient Removal of Pb(II) from Aqueous Solutions by Using Oil Palm Bio-Waste/MWCNTs Reinforced PVA Hydrogel Composites: Kinetic, Isotherm and Thermodynamic Modeling

Efficient Removal of Pb(II) from Aqueous Solutions by Using Oil Palm Bio-Waste/MWCNTs Reinforced PVA Hydrogel Composites: Kinetic, Isotherm and Thermodynamic Modeling

Effect of Na2CO3 on the Microstructure and Macroscopic Properties and Mechanism Analysis of PVA/CMC Composite Film

Composite adsorbents including oxidized graphene: effect of composition on mechanical durability and adsorption of pesticides

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