Starch Biocryogel for Removal of Methylene Blue by Batch Adsorption

Taweekarn, Tarawee; Wongniramaikul, Worawit; Boonkanon, Chanita; Phanrit, Chonthicha; Sriprom, Wilasinee; Limsakul, Wadcharawadee; Towanlong, Wanchitra; Phawachalotorn, Chanadda; Choodum, Aree

doi:10.3390/polym14245543

Cited by 16 publications

(24 citation statements)

References 55 publications

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“…The FESEM images of CPAam 10 -ILA 1 and CPHEMA 10 -ILB 1 hydrogels after ARS dye adsorption (Figure S21A,B) clearly revealed the change in surface morphology as compared to the pristine samples (Figure A,D). After adsorption, the observed macro/micropores were completely filled by ARS dye molecules and the hydrogel surfaces became smoother and saturated, which was very similar to the results reported for other systems . Again, after the desorption of dye molecules, the macroporous morphology with an interconnected polymer network was re-established (as shown in Figure S21C,D), providing active sites for further dye adsorption.…”

Section: Resultssupporting

confidence: 85%

“…For both CPAam and CPHEMA hydrogels, there were chances of H-bonding interactions between the N atom of CV with the amide and hydroxyl protons of the −CONH 2 and −COO(CH 2 CH 2 )OH groups of CPAam and CPHEMA, respectively, as reported earlier. , In addition to H-bonding interactions, the aromatic rings of both of the organic dye molecules and hydrogel scaffold were able to interact through π–π stacking interactions. ,− Considering CPAam 10 -ILB 1 and CPHEMA 10 -ILB 1 hydrogels as the representative samples, the above-mentioned physical interactions between CV dye molecules and the hydrogel network during the adsorption process were confirmed from the FTIR spectra of the CV dye adsorbed hydrogel samples. From Figures S10 and S11, it was clear that each of the characteristic FTIR bands of CPAam 10 -ILB 1 and CPHEMA 10 -ILB 1 samples underwent a significant decrease in the absorption band depth (increase in % T ) after the adsorption of CV dye, indicating that the functional groups/aromatic moieties present in the gel network were masked after their interactions with dye molecules. , The π–π interactions between phenyl moieties of CV and both of the imidazole and styryl moieties of ILA cross-linker present in the hydrogel network (Figure D) may result in higher percentages (72.4 and 63.8) of CV adsorption for ILA-based hydrogels compared to those (26.11 and 30.62) for ILB-based hydrogels.…”

Section: Resultsmentioning

confidence: 99%

“…After adsorption, the observed macro/micropores were completely filled by ARS dye molecules and the hydrogel surfaces became smoother and saturated, which was very similar to the results reported for other systems. 49 Again, after the desorption of dye molecules, the macroporous morphology with an interconnected polymer network was reestablished (as shown in Figure S21C,D), providing active sites for further dye adsorption.…”

Section: ■ Introductionmentioning

confidence: 90%

“…From Figures S10 and S11, it was clear that each of the characteristic FTIR bands of CPAam 10 -ILB 1 and CPHEMA 10 -ILB 1 samples underwent a significant decrease in the absorption band depth (increase in %T) after the adsorption of CV dye, indicating that the functional groups/ aromatic moieties present in the gel network were masked after their interactions with dye molecules. 49,50 The π−π interactions between phenyl moieties of CV and both of the imidazole and styryl moieties of ILA cross-linker present in the hydrogel network (Figure 3D) may result in higher percentages (72.4 and 63.8) of CV adsorption for ILA-based hydrogels compared to those (26.11 and 30.62) for ILB-based hydrogels.…”

Section: ■ Introductionmentioning

confidence: 99%

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Ionic Liquid Cross-Linked High-Absorbent Polymer Hydrogels: Kinetics of Swelling and Dye Adsorption

et al. 2023

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The use of polymer gels for the removal of toxic chemicals from wastewater is an important area in terms of both academic and industrial research. This work presents a simple approach to the fabrication of chemically cross-linked cationic hydrogel adsorbents using designed ionic liquid-based cross-linkers and their successful use in the removal of organic dyes. Two different ionic liquid cross-linkers, [VIm-4VBC][Cl] (ILA)/[DMAEMA-4VBC][Cl] (ILB), are synthesized by the simple nucleophilic substitution reaction of 4-vinylbenzyl chloride (4VBC) separately with 1-vinylimidazole (VIm) and 2-(dimethylamino)ethyl methacrylate (DMAEMA). Cross-linked poly(acrylamide) (CPAam) and poly(2-hydroxyethyl methacrylate) (CPHEMA) hydrogels are then prepared from the corresponding monomers and as-synthesized cross-linkers (ILA and ILB) by free radical polymerization in the presence of a redox initiator combining ammonium persulfate (APS) and N,N,N′,N′-tetramethylethylenediamine (TEMED). The dried CPAam and CPHEMA xerogels exhibit macroporous morphology and high thermal stability. The hydrogel samples exhibit high swelling behavior, and the diffusion of water molecules into the hydrogels follows pseudo-Fickian kinetics. The cationic cross-linking sites in the hydrogel networks allow preferable binding with anionic dyes, and these dye uptake capacities are determined using different model anionic dyes via UV–vis spectroscopy. The dye adsorption onto these hydrogels follows a pseudo-second-order kinetic model. The adsorption mechanism is also analyzed by employing intraparticle diffusion and Boyd kinetic models. The relationship between the maximum equilibrium adsorption capacity (q m) of the hydrogels for eosin B (EB) dye and the equilibrium EB concentration can be better described by Langmuir and Freundlich isotherm models, and the estimated q m using the Langmuir isotherm can reach more than 100 mg g–1. The cross-linked hydrogels can be easily regenerated and have a recycling efficiency of >80% for up to three consecutive dye adsorption–desorption cycles, which is promising for their use in wastewater treatment.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 90%

Section: ■ Introductionmentioning

confidence: 99%

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Ionic Liquid Cross-Linked High-Absorbent Polymer Hydrogels: Kinetics of Swelling and Dye Adsorption

et al. 2023

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“…Because hydrogels are basically adsorbents with a macro and mesoscopic structure. In this study,77 a hydrogel was synthesized in carboxylated starch. For the synthesis of hydrogel, a refined hydrogel was obtained F I G U R E 1 1 Schematic representation of starch grafted poly (acrylic acid) grafted copolymer.…”

mentioning

confidence: 99%

Cellulose‐ and starch‐based functional materials for efficiently wastewater treatment

Bekchanov,

Mukhamediev,

Eshtursunov

et al. 2023

Polymers for Advanced Techs

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The present study provides an overview of scientific developments made in the last decade in the field of green adsorbents focusing on the modifications in cellulose and starch and their applications such as drug delivery, wastewater treatment, and ion exchange. For this purpose, an introduction to the various methods of modifying cellulose and starch is first given, and then the properties, application, and future priorities of green adsorbents are also discussed. Methods of modification of cellulose and starch under homogeneous and heterogeneous conditions using modifiers with different properties are also described. Various methods for modifying cellulose and starch and the use of the obtained green adsorbents are reviewed. A comparison of the sorption properties of green adsorbents based on cellulose and starch and other adsorbents used in industry has also been carried out. Future perspectives on green adsorbents based on cellulose and starch are as also highlighted.

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