Cellulose hydrogel for enhanced uranium (VI) capture from nitrate medium: preparation, characterisation and adsorption optimisation

In this study, a superabsorbent polymer (SAP) comprising poly (IA-co-cellulose-co-VSA-co-AA; ICVA) core-SAP (CSAP) was synthesized through radical polymerization using itaconic acid (IA), acrylic acid (AA), cellulose, and vinyl sulfonic acid (VSA) as monomers. The absorption performances and relative biodegradability of various compositions prepared by adjusting the amounts of cellulose and VSA with constant IA and AA content were compared. Increasing the cellulose content in CSAP contributed to improved biodegradation of the surface-crosslinked SAP (SSAP) and gel strength, although the free absorbency (FA) and centrifuge retention capacity (CRC) decreased. Increasing the VSA content resulted in strong anionicity, which enables the absorption of large amounts of water. Surface-crosslinking technology was applied to the CSAP synthesized with the optimal composition ratio to increase its absorption performance and gel strength. Improved performance of the synthesized SSAP (a CRC of 30.4 g/g, absorbency under load (AUL) of 23.3 g/g, and permeability of 55 s) was achieved by selecting the optimal surface-crosslinking treatment time and the amount of distilled water in the surface-crosslinking solution: as the latter was increased in the surface-crosslinking solution, the AUL and permeability of the SSAP were improved, and its biodegradability was found to be 54% compared to the 100% biodegradable cellulose hydrogel in the control group.

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Synergic formulation of onion peel quercetin loaded chitosan-cellulose hydrogel with green zinc oxide nanoparticles towards controlled release, biocompatibility, antimicrobial and anticancer activity

International Journal of Biological Macromolecules ◽

10.1016/j.ijbiomac.2019.04.008 ◽

2019 ◽

Vol 132 ◽

pp. 784-794 ◽

Cited By ~ 18

Author(s):

Dhanya George ◽

P. Uma Maheswari ◽

K.M. Meera Sheriffa Begum

Keyword(s):

Zinc Oxide ◽

Controlled Release ◽

Anticancer Activity ◽

Zinc Oxide Nanoparticles ◽

Oxide Nanoparticles ◽

Onion Peel ◽

Cellulose Hydrogel

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Greener therapeutic pH-sensing wound dressing based on Curcuma Longa and cellulose hydrogel

European Polymer Journal ◽

10.1016/j.eurpolymj.2021.110744 ◽

2021 ◽

pp. 110744

Author(s):

Asmaa Ahmed Arafa ◽

Ahmed Ali Nada ◽

Abeer Yousry Ibrahim ◽

Magdy Kandil Zahran ◽

Osama A. Hakeim

Keyword(s):

Wound Dressing ◽

Curcuma Longa ◽

Ph Sensing ◽

Cellulose Hydrogel

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Selective capture of toxic anionic dyes of a novel prepared DMDAAC-grafted chitosan/genipin/cellulose hydrogel beads with antibacterial activity

International Journal of Biological Macromolecules ◽

10.1016/j.ijbiomac.2021.08.116 ◽

2021 ◽

Author(s):

Qiang Liu ◽

Na Xia ◽

Wenjing Wan ◽

Youcheng Gao ◽

Siming Zhu

Keyword(s):

Antibacterial Activity ◽

Anionic Dyes ◽

Hydrogel Beads ◽

Cellulose Hydrogel

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The change from symmetry to asymmetry of a sodium transport system in red cell membranes

Proceedings of the Royal Society of London Series B Biological Sciences ◽

10.1098/rspb.1985.0011 ◽

1985 ◽

Vol 223 (1233) ◽

pp. 449-457 ◽

Cited By ~ 1

Keyword(s):

Sodium Concentration ◽

Tracer Studies ◽

Chloride Medium ◽

Sodium Influx ◽

Nitrate Medium ◽

Sodium Efflux ◽

External Potassium ◽

Red Cell Membranes ◽

Stimulation Of ◽

Human Red Cells

A study has been made with human red cells of sodium movements that are sensitive to the drug furosemide. The aim was to see if furosemide-sensitive movements that are symmetrical (exchange) became asymmetrical (net transport) on replacement of chloride with nitrate as the major external anion. Cells were incubated for 4 h at 37 °C with 140 mm sodium, and chloride or nitrate as the principal anion. Under a variety of conditions (presence and absence of ouabain or furosemide, or both) the cell sodium concentration was always higher when chloride was replaced with nitrate. The cells became leakier to sodium. Tracer studies indicated that, in contrast to the results in chloride medium, the decrease in sodium influx was greater than the fall in efflux when furosemide was added to cells in nitrate medium. The results confirm that the sensitivity of sodium efflux to furosemide depended on chloride. However, influx showed a different sensitivity in that furosemide still inhibited in cells incubated in nitrate medium. The stimulation of sodium influx with nitrate medium was independent of external potassium (10–50 mm) and the furosemide-sensitive influx was also constant. It is concluded that symmetrical transmembrane sodium movements with cells in chloride medium became downhill asymmetrical in nitrate medium, giving a net gain of cell sodium that was insensitive to ouabain and sensitive to furosemide. The drug thus partly retarded the gain of cell sodium that otherwise occurred in the somewhat leaky cells.

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Preparation of Self-supporting Bagasse Cellulose Nanofibrils Hydrogels Induced by Zinc Ions

Nanomaterials ◽

10.3390/nano8100800 ◽

2018 ◽

Vol 8 (10) ◽

pp. 800 ◽

Cited By ~ 6

Author(s):

Peng Lu ◽

Ren Liu ◽

Xin Liu ◽

Min Wu

Keyword(s):

Food Packaging ◽

Cellulose Nanofibrils ◽

Solvent Recovery ◽

Zinc Ions ◽

Cellulose Dissolution ◽

Food Spoilage ◽

Carboxylate Groups ◽

Cellulose Hydrogel ◽

Colorimetric Indicator ◽

Binding Capability

Cellulose hydrogels are often prepared from native cellulose through a direct cellulose dissolution approach that often involves tedious process and solvent recovery problems. A self-supporting cellulose hydrogel was prepared by gelation of the TEMPO-oxidized bagasse cellulose nanofibrils (CNF) triggered by strong crosslinking between carboxylate groups and Zn2+. TEMPO process was used to generate negatively charged carboxylate groups on CNF surface to provide a high binding capability to Zn2+. Three TEMPO-oxidized CNFs of different carboxylate contents were prepared and characterized. TEM and AFM microscopes suggested that the sizes of CNFs were fined down and carboxylated cellulose nanofibrils (TOCNFs) of 5–10 nm wide, 200–500 nm long, and carboxylate contents 0.73–1.29 mmol/g were obtained. The final structures and compressive strength of hydrogels were primarily influenced by interfibril Zn2+-carboxylate interactions, following the order of TOCNFs concentration > content of carboxylate groups > concentration of zinc ions. A CO2 sensitive self-supporting cellulose hydrogel was developed as a colorimetric indicator of food spoilage for intelligent food packaging applications.

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