Synthesis and adsorption properties of superabsorbent hydrogel and peanut hull composite

Diao, Mengmeng; Li, Qiurong; Xiao, Haiyan; Duan, Ningjing; Xu, Junjun

doi:10.1016/j.jece.2014.07.006

Cited by 19 publications

(8 citation statements)

References 44 publications

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“…In such a case, covalent crosslinks can be introduced by adding vinyl monomers that reacts with the radical hydroxyl groups of the polysaccharide. For instance, Diao et al [69] modified peanut hull cellulose using potassium persufate at 50°C and the product from that reaction was further polymerized with acrylic acid, acrylamide, 2-acrylamide-2-methyl-1-propanesulfonic acid producing SH. The process to convert the uncrosslinkable polysaccharide into a functionalized/crosslinked polymer starts off with the thermal decomposition of the potassium persulfate.…”

Section: Chemical Hydrogels Based On Polysaccharides Vinyl-modified Bmentioning

confidence: 99%

“…The water absorption capacity of hydrogel particles can be improved by increasing their porosity. A way of doing this is to dry the particles in scCO 2 [69,86]. Beyond providing porous particles, supercritical drying also is an efficient approach to prepare small particles with narrow particle size distribution, as compared to traditional solvent evaporation of emulsions used in the production of polymeric nanoparticles [87].…”

Section: Polysaccharide-based Hydrogels Prepared By Scco 2 -Assisted mentioning

confidence: 99%

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Superabsorbent hydrogels based on polysaccharides for application in agriculture as soil conditioner and nutrient carrier: A review

Guilherme

Aouada

Fajardo

et al. 2015

European Polymer Journal

577

325

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a b s t r a c t Superabsorbent hydrogels (SH) continue being a very important issue in both academic and industrial fields due to their applications in several technologies. This is proved by the impressive number of publications, through papers and patents as well, dealing with SH. This review is targeted to update and discuss some important aspects of synthesis, characterization and application of SH in agriculture, mainly those based on polysaccharides, as soil conditioners and as polymer carriers for nutrient release. Basic properties of SH and some methods for chemically modifying polysaccharides are given and some directions for hydrogels preparation are highlighted as well. Mechanisms associated with water transport into the 3D matrix, taking into account the transference of mass from hydrogelsoil system to plant, are discussed in the light of some mathematical models. Release of nutrients either from granules coated by hydrophilic polymer or from SH, targeting applications in agriculture, is also discussed on the basis of often used mathematical models (the swelling-based kinetic models) and on a diffusion-based kinetic model with a partition activity coefficient. Examples of recent applications in agriculture as soil conditioners and carriers for nutrient release (fertilizers, etc.) are given. At the final, future trends and perspectives are considered. More than two hundreds references are cited in the whole text.

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Section: Chemical Hydrogels Based On Polysaccharides Vinyl-modified Bmentioning

confidence: 99%

Section: Polysaccharide-based Hydrogels Prepared By Scco 2 -Assisted mentioning

confidence: 99%

Superabsorbent hydrogels based on polysaccharides for application in agriculture as soil conditioner and nutrient carrier: A review

Guilherme

Aouada

Fajardo

et al. 2015

European Polymer Journal

577

325

View full text Add to dashboard Cite

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“…The pseudo-second order swelling kinetics model (Equation ( 3)) and the Ritger-Peppas model (Equation ( 4)) were used to analyze the experimental swelling data to evaluate the swelling behavior of SAPC, with results shown in Figure 6a,b [40][41][42]:…”

Section: Performance Tests Of Sapc 361 Swelling Kinetics Of Sapc In Distilled Watermentioning

confidence: 99%

Kaolin-Enhanced Superabsorbent Composites: Synthesis, Characterization and Swelling Behaviors

Chen

Zhang

et al. 2021

Polymers

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One type of low-cost and eco-friendly organic‒inorganic superabsorbent composite (SAPC) was synthesized by free radical polymerization of acrylic acid (AA), starch (ST), sodium alginate (SA) and kaolin (KL) in aqueous solution. The structure and morphology of the SAPC were characterized by Fourier transform infrared spectrometer (FT-IR), scanning electron microscope (SEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The influence of different reaction conditions on water absorption of SAPC, i.e., SA and KL contents, AA neutralization degree (ND), potassium persulfate (KPS) and N, N′-methylenebisacrylamide (MBA) loading were systematically studied. Under the optimal synthesis conditions, very high water absorption of 1200 g/g was achieved. The swelling kinetic mechanism of SAPC was studied by pseudo-second order swelling kinetics model and Ritger‒Peppas model. The performances of SAPC under different environments were tested and results revealed that this new SAPC had excellent swelling capacity, high water retention, good salt tolerance in monovalent salt solution (NaCl solution) and good pH tolerance between 4 and 10.

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“…Removal performances of Cu(II) and Ni(II) were achieved at 60‐99% for CGAA (pH 5, 7) and 52–96% for CGAM (pH 7) with loading dose of 8 g l −1 . The reactivity of functionalities from AA or AM grafted onto cellulose was the influence factor in the adsorption process, which affect the replacement reactions of lone‐pair electrons or negative charges with metal ions . For AA, carboxyl group contains two lone pair electrons on the oxygen atom.…”

Section: Resultsmentioning

confidence: 99%

Cellulose Graft Poly(acrylic acid) and Polyacrylamide: Grafting Efficiency and Heavy Metal Adsorption Performance

Wichaita

Samart

Yoosuk

et al. 2015

Macromolecular Symposia

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Corn cob cellulose was prepared by alkali-treatment method and grafted with acrylic acid and acrylamide using ammonium persulphate as an initiator and N,N 0 -methylenebisacrylamide as a cross-linker. The influences of monomer to cellulose ratio, initiator content, cross-linker content and reaction temperature on grafting efficiency were studied. The maximum grafting efficiency was achieved at 89% at the appropriate condition. Properties of grafted cellulose were characterized by SEM, FTIR, CHNO analysis and TGA. Poly(acrylic acid) and polyacrylamide modified cellulose were used as adsorbents for Cu(II) and Ni(II) removal from aqueous solution. The adsorption capacity was in the range of 8-12 mg g À1 with the removal performance up to 52-99%.

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Synthesis and adsorption properties of superabsorbent hydrogel and peanut hull composite

Cited by 19 publications

References 44 publications

Superabsorbent hydrogels based on polysaccharides for application in agriculture as soil conditioner and nutrient carrier: A review

Superabsorbent hydrogels based on polysaccharides for application in agriculture as soil conditioner and nutrient carrier: A review

Kaolin-Enhanced Superabsorbent Composites: Synthesis, Characterization and Swelling Behaviors

Cellulose Graft Poly(acrylic acid) and Polyacrylamide: Grafting Efficiency and Heavy Metal Adsorption Performance

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