Adsorption capacity, kinetics, and mechanism of copper(II) uptake on gelatin‐based hydrogels

Kumari, Manju; Chauhan, Ghanshyam S.

doi:10.1002/app.32632

Cited by 14 publications

(2 citation statements)

References 41 publications

(36 reference statements)

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“…On the contrary, the chemical junction is permanent and formed by covalent bonds. Today, hydrogels have numerous application possibilities ranging from wastewater treatment (Kumari and Chauhan 2011) over agriculture (Guilherme et al 2010) to tissue engineering (Drury and Mooney 2003). Likewise the polymers used for gel formation are diverse and can be both of natural and synthetic origin (Wang et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Development of hydrogels based on oxidized cellulose sulfates and carboxymethyl chitosan

et al. 2019

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Cellulose or chitosan represent highly abundant biopolymers possessing excellent biocompatibility that is required in tissue engineering. Both, cellulose and chitosan can be used to form hydrogels that can replace soft human tissues like cartilage. Hence, we developed here an approach to oxidize cellulose after sulfation, which was then crosslinked with carboxymethyl chitosan (CMCh). Sulfation was performed either by direct or acetosulfation reaching different sulfation degrees of DS Sulf = 0.8-2.0. Subsequently oxidation of cellulose sulfate (CS) was performed with sodium periodate, which yielded aldehyde contents of DS Ald = 0.1-0.3. Since oxidation requires the presence of vicinal hydroxyl groups in the anhydroglucose unit (AGU) of CS, higher sulfation degree as obtained by direct sulfation including hydroxyl groups at C2 and C3-position yielded lower aldehyde contents. On the contrary, regioselective sulfation at C6-position by acetosulfation was more suitable to achieve higher oxidation degrees of CS. Consequently, hydrogel formation obtained by chemical crosslinking of oxidized cellulose sulfate (oCS) with CMCh was fast within seconds when oxidation degree was high, but sulfation degree low. Moreover gel formation lasted almost 24 h when sulfation degree was high. It could also be shown that hydrogels based on oCS with a DS Ald of 0.28 or higher were stable for 25 days when incubated in phosphate-buffered saline (PBS) or Dulbeccos modified Eagle medium (DMEM). Studies with pH dependent fluorescent tracer molecules could show that the intrinsic pH value in hydrogels was slightly acidic ($ pH 6.4) when they were incubated in PBS at pH 7.4. Mass transfer and homogeneity of the gel network was studied by NMR finding that diffusion of water molecules was not hindered inside the hydrogels.

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Section: Introductionmentioning

confidence: 99%

Development of hydrogels based on oxidized cellulose sulfates and carboxymethyl chitosan

et al. 2019

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“…Chemical and physical cross-linking, free-radical polymerization, free-radical or graft copolymerization, and irradiation cross-linking of polymers are commonly used methods for preparing hydrogel by mixing hydrophilic polymers with various functional groupcarrying cross-linkers. [34,68,[89][90][91] The primary constituents of hydrogel synthesis are the monomer, initiator, cross-linker, and solvent. For example, a biopolymer-based hydrogel has been prepared by free-radical graft copolymerization using acrylamide (AAm) and acrylic acid (AA) as monomers, N,N′-methylenebis (acrylamide) (MBA) as cross-linker, and the ascorbic acid/ potassium persulfate redox pair as initiator.…”

Section: Synthesis Of Hydrogelsmentioning

confidence: 99%

Hydrogel Nanocomposite Adsorbents and Photocatalysts for Sustainable Water Purification

Kumar

Gusain

Pandey

et al. 2022

Adv Materials Inter

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Anthropogenic actions, environmental catastrophes, urbanization, population growth, and industrialization generate toxic pollutants in water bodies. The most pollutants are heavy metals and metalloids, dyes, volatile organic compounds, pharmaceuticals, pesticides, radionuclides, aromatic hydrocarbons, oils, polycyclic aromatic hydrocarbons, microbes/pathogens, and microplastics that can be in different forms and concentrations. [3][4][5] Globally, approximately 2 million tons of pollutants from agriculture, industrial, and sewage waste are released into water streams, which pose severe health risks and cause the deaths of more than 1400 people every day. [6] Thus, developing efficient, economical, environmentalfriendly, and scalable technologies for the purification of wastewater and seawater is urgently required. To fulfill the shortage of clean water, affordable technologies can be used to transform unconventional water reserves (such as wastewater, rainfall, seawater, and brackish water) into potable water. Recently, numerous water treatment technologies, including coagulation/flocculation, filtration, chemical precipitation, aerobic/anaerobic processing, biological treatment, electrochemically precipitation, advanced oxidation processing, membrane separation, ion-exchange, adsorption, solar/thermal distillation/evaporation, crystallization, and photocatalysis, have emerged to offer practical solutions to water pollution management. [7][8][9][10][11][12][13][14] Among them, adsorption and photocatalysis technologies have garnered significant attention from the research community due to their cost-effectiveness, high performance, Hydrogels have been employed for water purification applications, but their performance and strength are unsatisfactory for widespread adoption. Recently, hydrogel nanocomposites have been proposed to resolve the inherent challenges faced by hydrogels for water treatment. This review comprehensively analyzes hydrogel nanocomposites for water treatment using adsorbent and photocatalysis techniques. The structure, classification, and tunable synthesis methods of hydrogels are explained. Further, how hydrogels can be incorporated with functional nanoparticles (NPs) and can be used as templates/precursors for developing advanced 3D architectures, including the formation of hydrogel nanocomposite beads and 3D printing objects are discussed. Finally, the structure-property relationships of hydrogel nanocomposites are critically reviewed by considering introductory gelation chemistry, such as swelling characteristics, mechanical properties, stimuli-responsiveness, and ionic/electronic conduction. The extensive cross-linking of polymer chains with NPs offers high mass/charge transport, high surface areas, and enhanced polymer-water interactions to achieve high-performing adsorbents and photocatalysts. Several motivating examples of emerging NP-containing hydrogel nanocomposites for use in adsorbents and photocatalysis have been discussed. Such efforts validated the excellent technological pote...

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Eco-Friendly Chitosan-Based Nanocomposites: Chemistry and Applications

Cheaburu-Yılmaz

Vasile

2015

Advanced Structured Materials

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Adsorption capacity, kinetics, and mechanism of copper(II) uptake on gelatin‐based hydrogels

Cited by 14 publications

References 41 publications

Development of hydrogels based on oxidized cellulose sulfates and carboxymethyl chitosan

Development of hydrogels based on oxidized cellulose sulfates and carboxymethyl chitosan

Hydrogel Nanocomposite Adsorbents and Photocatalysts for Sustainable Water Purification

Eco-Friendly Chitosan-Based Nanocomposites: Chemistry and Applications

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