Superadsorbent hydrogel based on lignin and montmorillonite for Cu(II) ions removal from aqueous solution

Sun, Xiao Feng; Hao, Yiwei; Cao, Yingyue; Zeng, Qihang

doi:10.1016/j.ijbiomac.2019.01.058

Cited by 86 publications

(32 citation statements)

References 43 publications

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“…As observed for both cases of SPHs, their swelling capacity substantially diminishes with an increase in NaCl concentration. This result is in harmony with Sun et al [42] and Singh and Dhaliwal [18] who reported a rapid decrease in hydrogel adsorption due to the increasing amount of Na + metal ion concentration of the solutions. This phenomenological occurrence can be attributed to the effect of the additional cations which cause a decrease in anion-anion electrostatic repulsion, resulting in a decrease in the osmotic pressure difference between the polymer networks and the external solution.…”

Section: Effect Of Salinity Concentrationsupporting

confidence: 90%

“…This indicates that the swelling process does appropriately fit the Schott second-order dynamic equation. Comparable results were seen by Sun et al [42,44] who calculated R 2 values greater than 0.98 for their calculated kinetic parameters.…”

Section: Swelling Kineticssupporting

confidence: 70%

“…The swelling kinetics of SPHs is important for their application in the oil and gas industry especially for specific use in water production scenarios, because their swelling performance is directly affected by their adsorption properties [42]. To explain the swelling mechanism of the investigated SPHs, the Schott second-order dynamic model [42,43] presented in Eq. 4 was used to analyse the experimental data.…”

Section: Swelling Kineticsmentioning

confidence: 99%

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Swelling performance of sodium polyacrylate and poly(acrylamide-co-acrylic acid) potassium salt

et al. 2019

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The application of superabsorbent polymer hydrogels in the oil and gas industry for reservoir and well management is gaining more traction. In this study, the swelling performance and adsorption kinetics of two commercial superabsorbent polymer hydrogels-poly(acrylamide-co-acrylic acid) potassium salt and sodium polyacrylate-were evaluated based upon their stimuli response to pH and salinity at varying temperature and reaction time periods. Characterisation and evaluation of the materials were performed using analytical techniques-optical microscopy, scanning electron microscopy, thermal gravimetric analysis and the gravimetric method. Experimental results show that reaction conditions strongly influence the swelling performance of the superabsorbent polymer hydrogels considered in this study. Generally, increasing pH and salinity concentration led to a significant decline in the swelling performance of both superabsorbent polymer hydrogels. An optimal temperature range between 50 and 75 °C was considered appropriate based on swell tests performed between 25 c to 100 °C over 2-, 4-and 6-h time periods. These findings serve as a guideline for field engineers in the use of superabsorbent polymer hydrogels for a wide range of oilfield applications. The study results provide evidence that the two superabsorbent polymer hydrogels can be used for petroleum fraction-saline water emulsions separation, reservoir zonal isolation, water shutoff and cement plugging applications.

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Section: Effect Of Salinity Concentrationsupporting

confidence: 90%

Section: Swelling Kineticssupporting

confidence: 70%

Section: Swelling Kineticsmentioning

confidence: 99%

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Swelling performance of sodium polyacrylate and poly(acrylamide-co-acrylic acid) potassium salt

et al. 2019

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“…6a.

t / S_{t} = A + Bt

where S t is the water uptake at a set swelling time t (min), the intercept A is the reciprocal of k 2 , and k 2 is the initial swelling rate constant of the hydrogel and indicates the effect of short time on the water uptake. The slope B = 1/ S eq , where S eq is the theoretical equilibrium SR of the hydrogel and expressed as the long‐term effect on the water uptake [55]. The Schott parameters are tabulated in Table S1.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Thermal and pH Dual Sensitive Hydrogel Based on 1,3‐Dipole Cycloaddition Reaction

Wei

Liu

Zhu

et al. 2020

Polymer Engineering & Sci

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In this study, thermal and pH dual sensitive hydrogels were prepared via Cu-free 1,3-dipole cycloaddition between two copolymers which were modified by azide and maleimide functional groups, respectively. First, the thermally sensitive terpolymers were fabricated via conventional free-radical polymerization of N-isopropylacrylamide, hydroxyethyl methacrylate (HEMA), and N,N-dimethylacrylamide (DMA). Then, polymeric dipolarophiles were synthesized via the esterification between the above terpolymers and N-maleoyl alanine. Similarly, the pH-sensitive terpolymers were also fabricated via conventional free-radical polymerization of 4-vinylpyridine, HEMA, and DMA, and then, polymeric dipoles were acquired via the decoration of the as-prepared terpolymers with 2-azidoacetic acid. Afterward, the smart hydrogels were fabricated via the aqueous 1,3-dipole cycloaddition reaction between the as-prepared polymeric dipolarophiles and dipoles without the use of catalysts. The results of swelling measurements confirm that the hydrogels possessed thermal and pH dual sensitivity. Moreover, the investigation of the behavior of oscillatory swelling shrinking indicates their sensitivity to temperature and pH was reversible and repeatable, which is of great significance for the repeated use of the prepared hydrogels. The proposed strategy demonstrates a great application prospects in the preparation of hydrogels as there were no catalysts and organic solvents employed. POLYM. ENG. SCI., 60:917-924, 2020.

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“…Carboxymethylated lignins were graft-copolymerized with acrylic acid and the effect of lignin as crosslinking agent was analyzed in terms of water absorbance capacity [57]. Acrylic acid was also copolymerized with lignin in the presence of NMBA as external crosslinker and montmorillonite as inorganic filler, leading to superabsorbent composites with excellent adsorption/desorption performance of Cu(II) (Figure 8) [58]. For this, a redox initiator generates free radicals, which leads to the simultaneous polymerization of acrylic acid (PAA) and grafting of lignin hydroxyl groups to PAA.…”

Section: Lignin Hydrogels By Chemical Interactionmentioning

confidence: 99%

Lignin-Based Hydrogels: Synthesis and Applications

et al. 2020

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Polymers obtained from biomass are an interesting alternative to petro-based polymers due to their low cost of production, biocompatibility, and biodegradability. This is the case of lignin, which is the second most abundant biopolymer in plants. As a consequence, the exploitation of lignin for the production of new materials with improved properties is currently considered as one of the main challenging issues, especially for the paper industry. Regarding its chemical structure, lignin is a crosslinked polymer that contains many functional hydrophilic and active groups, such as hydroxyls, carbonyls and methoxyls, which provides a great potential to be employed in the synthesis of biodegradable hydrogels, materials that are recognized for their interesting applicability in biomedicine, soil and water treatment, and agriculture, among others. This work describes the main methods for the preparation of lignin-based hydrogels reported in the last years, based on the chemical and/or physical interaction with polymers widely used in hydrogels formulations. Furthermore, herein are also reviewed the current applications of lignin hydrogels as stimuli-responsive materials, flexible supercapacitors, and wearable electronics for biomedical and water remediation applications.

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Superadsorbent hydrogel based on lignin and montmorillonite for Cu(II) ions removal from aqueous solution

Cited by 86 publications

References 43 publications

Swelling performance of sodium polyacrylate and poly(acrylamide-co-acrylic acid) potassium salt

Swelling performance of sodium polyacrylate and poly(acrylamide-co-acrylic acid) potassium salt

Preparation and Characterization of Thermal and pH Dual Sensitive Hydrogel Based on 1,3‐Dipole Cycloaddition Reaction

Lignin-Based Hydrogels: Synthesis and Applications

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