Novel magnetic polyvinyl alcohol/laponite RD nanocomposite hydrogels for efficient removal of methylene blue

Mahdavinia, Gholam Reza; Soleymani, Moslem; Sabzi, Mohammad; Azimi, Hamidreza; Atlasi, Ziba

doi:10.1016/j.jece.2017.05.017

Cited by 91 publications

(31 citation statements)

References 80 publications

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“…It could be suggested that the endothermic evolution might occur by increasing the Pb(II) solution temperature on the exterior boundary layer and therefore improved the inner pores of applied adsorbent. The positive estimations of ∆S • confirmed the increased randomness over the liquid-solid interface during the adsorption process of Pb(II) over the surface of OPB/PVA/MWCNTs hydrogel [31,65]. The results of the activation energy (E a ) confirmed the nature of adsorption process.…”

Section: Adsorption Thermodynamics and Activation Energymentioning

confidence: 68%

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: Adsorption Thermodynamics and Activation Energymentioning

confidence: 68%

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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“…11 and 12, the swelling degrees of nanocomposite hydrogels decreased with increasing CuO addition. This decline may be attributed to chelating of some of the hydroxyl groups of the hydrogel networks with nanoparticles, which lead to the knot tying function of CuO or more cross-linking points [1,9]. Fig.…”

Section: The Swelling Ability Of the Hydrogelsmentioning

confidence: 99%

“…10, 11 and 12. With higher CuO content, it can be assumed that the interaction between nanoparticles and polymeric chains leads to more cross-linking points and low free space to enlarge inside the nanocomposites, so swelling capacity is reduced [1]. The highest swelling degree was obtained with PVA/CuO-0.05 nanocomposite hydrogel containing 0.05 g CuO and neat PVA after seven days.…”

Section: The Swelling Ability Of the Hydrogelsmentioning

confidence: 99%

“…Thanks to these excellent properties, they are widely used in biomedical fields such as hydrogels, drug, and cell distribution system, enzyme immobilization, antibacterial, tissue engineering, and biosensors. Hydrogels have also found widespread use as sorbents for the removal of various contaminants from agriculture and from aqueous solutions [1][2][3]. Among the polymers, Poly (vinyl alcohol) (PVA) is an easily processable inert polymer, which is a kind of hydrophilic semi-crystalline widely used because of the toxicity, biocompatibility, excellent chemical resistance and mechanical strength in biomedical applications [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Polyvinyl alcohol/CuO nanocomposite hydrogels: facile synthesis and long-term stability

Boran¹,

Karakaya²

2019

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Within this study, Polyvinyl alcohol/CuO nanocomposite hydrogels were synthesized through dispersing CuO nanoparticles in a PVA solution, using the freeze-thawing procedure in order for physically crosslinking. The average particle size of CuO nanoparticles which was added to the hydrogel was determined as 3.51 nm according to the XRD analysis after the ball milling process. The presence of CuO nanoparticles in nanocomposite hydrogels was determined by UV-vis spectroscopy, FESEM, EDS, and FTIR analysis. Also, the rheological properties of neat hydrogel and PVA/CuO nanocomposite hydrogels were examined. The addition of CuO nanoparticles to the polymer structure develops rheological features of PVA hydrogels. The Effect of CuO content of nanocomposite hydrogels on the swelling behavior and long term stability was investigated. These nanocomposite hydrogels demonstrated unique properties for biomedical applications due to their high swellability at pH 2.1 as the pH values of the stomach and long term stability. According to these results, the addition of CuO to the hydrogel structure improved the swelling characteristics of neat PVA hydrogel.

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“…The assembly of biopolymers to clay minerals giving rise because of their synergistic effect regarding both the mechanical and the absorption properties of these systems . Recently, several attempts have been made to composite the adsorbents with biopolymers, such as poly(vinyl alcohol), carrageenan, chitosan, alginate, cellulose, and silk fibroin which led to enhancement in their adsorption capacity. Gelatin (GE) is a natural biopolymer and has a long history of safe use in cosmetic, pharmaceutical and food industries .…”

Section: Introductionmentioning

confidence: 99%

Assembly of gelatin biopolymer to fibrous sepiolite clay for efficient dye removal from wastewater

Sabzi

Shafagh

Mohammadi

2019

J of Applied Polymer Sci

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This work aimed to fabricate nanocomposites using low‐cost and natural materials for fast and efficient dye adsorption from wastewater. To achieve this, fibrous sepiolite clay was incorporated into the gelatin (GE) biopolymer. The obtained nanocomposites were characterized by Fourier transform infrared spectroscopy and scanning electron microscope techniques. The effects of sepiolite/GE ratio, adsorbent dosage, solution pH, contact time, and initial dye concentration on the adsorption capacity of nanocomposites were well studied and optimized through batch adsorption study. Kinetics, isotherms, and thermodynamics analysis were also performed for methylene blue adsorption. The adsorption data were better fitted with the pseudo‐second‐order and Langmuir isotherm models. The prepared nanocomposites demonstrated a fast and efficient adsorption performance toward the MB dye with the maximum adsorption capacity as high as 684.8 mg g−1 within only an equilibrium time of 30 min, which revealed their promising potential in wastewater treatment. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48266.

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Novel magnetic polyvinyl alcohol/laponite RD nanocomposite hydrogels for efficient removal of methylene blue

Cited by 91 publications

References 80 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

Polyvinyl alcohol/CuO nanocomposite hydrogels: facile synthesis and long-term stability

Assembly of gelatin biopolymer to fibrous sepiolite clay for efficient dye removal from wastewater

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