Radiation induced modified CMC-based hydrogel with enhanced reusability for heavy metal ions adsorption

Hong, Tran Thu; Okabe, Hirotaka; Hidaka, Yoshiki; Omondi, Brian A.; Hara, Kazuhiro

doi:10.1016/j.polymer.2019.121772

Cited by 34 publications

(11 citation statements)

References 17 publications

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“…The easiest way to covalently introduce cellulose into hydrogel networks is through a radical mechanism initiated by redox polymerization [ 72 ] as well as high‐energy irradiations (e.g., UV, [ 73 ] γ‐ray, [ 74 ] and electron‐beam radiation [ 75 ] ). It was found that the active sulfate anion radicals generated from persulfate initiator decomposition could extract hydrogen from the −OH groups in the cellulose, producing more active alkoxy radicals, then those radical could initiate the vinyl monomers growing.…”

Section: Synthesis Of Polysaccharide‐based Hydrogelsmentioning

confidence: 99%

Recent advances in polysaccharide‐based hydrogels for synthesis and applications

Lin

2021

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Hydrogels are three‐dimensional (3D) crosslinked hydrophilic polymer networks that have garnered tremendous interests in many fields, including water treatment, energy storage, and regenerative medicine. However, conventional synthetic polymer hydrogels have poor biocompatibility. In this context, polysaccharides, a class of renewable natural materials with biocompatible and biodegradable properties, have been utilized as building blocks to yield polysaccharide‐based hydrogels through physical and/or chemical crosslinking of polysaccharides via a variety of monomers or ions. These polysaccharide‐derived hydrogels exhibit peculiar physicochemical properties and excellent mechanical properties due to their unique structures and abundant functional groups. This review focuses on recent advances in synthesis and applications of polysaccharide‐based hydrogels by capitalizing on a set of biocompatible and biodegradable polysaccharides (i.e., cellulose, alginate, chitosan, and cyclodextrins [CDs]). First, we introduce the design and synthesis principles for crafting polysaccharide‐based hydrogels. Second, polysaccharide‐based hydrogels that are interconnected via various crosslinking strategies (e.g., physical crosslinking, chemical crosslinking, and double networking) are summarized. In particular, the introduction of noncovalent and/or dynamic covalent interactions imparts polysaccharide‐based hydrogels with a myriad of intriguing performances (e.g., stimuli–response and self‐recovery). Third, the diverse applications of polysaccharide‐based hydrogels in self‐healing, sensory, supercapacitor, battery, drug delivery, wound healing, tissues engineering, and bioimaging fields are discussed. Finally, the perspectives of polysaccharide‐based hydrogels that promote their future design to enable new functions and applications are outlined.

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Section: Synthesis Of Polysaccharide‐based Hydrogelsmentioning

confidence: 99%

Recent advances in polysaccharide‐based hydrogels for synthesis and applications

Lin

2021

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158

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“…Therefore, it could intercept the movement and then heavy metal cation in aqueous solution could not diffuse into the resin. As a result, the adsorption capacity was declined [10,27].…”

Section: Adsorption Capacity Of Heavy Metal Cations On Cellulose Based Ion Exchange Resinsmentioning

confidence: 99%

“…Among those ions with the same charge, the tendency of adsorption capacity increased with the radius reduction of heavy metal cations in water (hydrated radius) in the order: Pb 2+ < Ni 2+ < Cu 2+ < Cd 2+ as shown in Table 3. Due to electrostatic effect and the metal binding strength increases with the decrement of the hydrated metal cation radius [4,27,28]. However, the actual ion exchange of -COO -Na + group with metal cations also depend on the other factor such as pH, charge density and ionic strength that had influenced on adoption capacity.…”

Section: Adsorption Capacity Of Heavy Metal Cations On Cellulose Based Ion Exchange Resinsmentioning

confidence: 99%

“…Moreover, Pb 2+ in the aqueous solution possessed the smallest hydrated radius when compared with other cations as seen in Table 3. It meant that Pb 2+ ions could easily diffuse into the resin and could chelate with chelating functional group in the resin with superiority [27]. Table 3.…”

Section: Adsorption Capacity Of Heavy Metal Cations On Cellulose Based Ion Exchange Resinsmentioning

confidence: 99%

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Effect of Chelating Agents on Removal of Heavy Metal Cations of Cellulose-based Ion Exchange Resins from Water Hyacinth

et al. 2021

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Presently, heavy metal pollution in natural water resources is considered very hazardous. The purpose of this research is to develop the novel cellulose-based ion exchange resins from water hyacinth and the effect of chelating agents on the removal of heavy metal cations from single-metal aqueous solutions has been investigated. Cellulose was prepared from the stem of water hyacinth by alkaline treatment process then cellulose-based ion exchange resins were prepared via esterification reaction between cellulose with two different chelating agents such as pyromellitic dianhydride and 3,3’,4,4’- benzophenone tetracarboxylic dianhydride. The chemical structure, crystallinity index, surface morphology, and thermal stability of resins were characterized and analyzed with FTIR, XRD, SEM, and TGA, respectively. The results confirmed the esterification reaction between anhydride groups of chelating agents with hydroxyl groups of celluloses due to the apparent peak of the ester group. Heavy metal cations adsorptions were studied in optimum conditions and the residual concentration of heavy metal cations was measured by ICP. These resins showed high adsorption capacities of more than 98 mg/g for Pb2+, Cd2+, Cu2+, and Ni2+. Moreover, the adsorption process was controlled by the ion exchange mechanism. Therefore, the novel cellulose-based ion exchange resins could be suitable for the removal of pollutants from wastewater.

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“…These observations are associated with the crosslinking density of the polymer, which is controlled by the crosslinker concentration. The increase in crosslinking sites between the numerous linear molecules al-lows the gel to obtain a high crosslinking density, which also augments the stretching resistance of the polymer chains and results in the reduction of the expansibility of the resin (Hong et al 2019).…”

Section: Effect Of Crosslinking Degree On Expansibility Of the Resinmentioning

confidence: 99%

High crosslinked sodium carboxyl methylstarch-g-poly (acrylic acid-co-acrylamide) resin for heavy metal adsorption: its characteristics and mechanisms

Zhang

Yang

Lan

et al. 2020

Environ Sci Pollut Res

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A lower expansive heavy metal adsorbent, high crosslinked sodium carboxyl methylstarch-g-poly (acrylic acid-co-acrylamide) resin (HCAA), has been prepared by enhancing the crosslinking degree of the traditional water-absorbing polymer under the graft copolymerization reaction. Further heavy metal adsorption experiments, morphology analysis, and structure characteristic observations indicate that HCAA resin has an excellent heavy metal adsorption properties for Cr 3+ , Cu 2+ , Ni 2+ , and Zn 2+ of 80.08, 158.07, 155.71, and 137.15 mg/g, respectively. The nanoholes in network structures of HCAA resin expanding in solution provide an effective diffusion and exchange channels for heavy metal ions and Na + . The adsorption process of HCAA containing -COONa is attributed to ion exchange process, and its essence is to form the coordination bond with heavy metals. The adsorption capacity differences of -COO − have been explained by using the coordination chemistry theory. In addition, the adsorption selectivity of an expansive adsorbent containing -COONa are heavy metals > H2O >> Na + . Our research puts forward an insight that increasing the crosslinker content on the basis of the traditional super absorbent resin can obtain a lower expansive adsorbent to heavy metal pollutants.

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Radiation induced modified CMC-based hydrogel with enhanced reusability for heavy metal ions adsorption

Cited by 34 publications

References 17 publications

Recent advances in polysaccharide‐based hydrogels for synthesis and applications

Recent advances in polysaccharide‐based hydrogels for synthesis and applications

Effect of Chelating Agents on Removal of Heavy Metal Cations of Cellulose-based Ion Exchange Resins from Water Hyacinth

High crosslinked sodium carboxyl methylstarch-g-poly (acrylic acid-co-acrylamide) resin for heavy metal adsorption: its characteristics and mechanisms

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