Preparation Of Carboxymethyl Research Articles

Preparation of carboxymethyl cellulose/graphene oxide/ZIF-8 aerogels for efficient methylene blue adsorption

Despite the promising potential of zeolitic imidazole framework-8 (ZIF-8) for dye adsorption, addressing challenges such as aggregation and recycling difficulties remains essential. Herein，a novel three dimensional (3D) carboxymethyl cellulose (CMC), graphene oxide (GO) and ZIF-8 hybrid aerogel (CGZ-3) was prepared via blending ZIF-8 into the CMC-GO matrix. The structure and composition of CGZ-3 were characterized by SEM, FT-IR, TG and XPS. Adsorption experiments were conducted to optimize various parameters affecting the behavior of methylene blue (MB) adsorption. The composite aerogel exhibited an obvious lamellar network structure, with a surface rich in oxygen-containing functional groups such as -OH and -COOH. CGZ-3 demonstrated a rapid adsorption rate for MB, achieving a removal efficiency of 96% within 15 minutes. The entire adsorption process was spontaneous and endothermic, consistent with the pseudo-first-order kinetic model and Langmuir adsorption isotherm model. The maximum theoretical adsorption capacity was 427.35 mg/g at 298 K. Selective adsorptions tests demonstrated high selectivity of the composite aerogel for MB, and dynamic adsorption further confirmed the exceptional adsorption capacity of CGZ-3. After five cycles of adsorption-desorption, the MB removal rate remained above 95%, with an adsorption capacity exceeding 240 mg/g, highlighting the stability and reusability of CGZ-3. Collectively, the CGZ-3 would be a potential material for the adsorptive removal of MB in practical water treatment.

Preparation of Carboxymethyl Cellulose/Polyvinyl Alcohol Cryogels for the Removal of Methylene Blue Dye from Aqueous Media

Preparation of Carboxymethyl Cellulose/Polyvinyl Alcohol Cryogels for the Removal of Methylene Blue Dye from Aqueous Media

Preparation of carboxymethyl chitosan/double-formaldehyde cellulose based hydrogel loaded with ginger essential oil nanoemulsion for meat preservation.

The online version contains supplementary material available at 10.1007/s10068-023-01437-4.

Preparation of carboxymethyl cellulose/polyvinyl alcohol wound dressing composite immobilized with anthocyanin extract for colorimetric monitoring of wound healing and prevention of wound infection

Novel aerogel-like wound dressing able to sense the healing progress was developed. Anthocyanins (Ac) have been reported as a significant pH-sensory extract with various biological activities. Herein, anthocyanins were extracted from red-cabbage (Brassica oleracea L. Var. capitata). The anthocyanin probe was integrated as a water-soluble direct dye at various concentrations into carboxymethyl cellulose/polyvinyl alcohol composite in the presence of potassium aluminum sulfate mordant. The generated composites were then freeze-dried to provide the corresponding aerogel-like smart wound dressing to function as an antibacterial and biochromic bulk presenting a comfort dressing biosensor to monitor the progress of a wound healing. Reducing the pH value of a wound mimicking fluid resulted in a hypsochromic shift from 592 to 446 nm. The halochromic activity of anthocyanin showed colorimetric changes from purple to pink. The colorimetric measurements of the prepared anthocyanin-containing aerogel-like diagnostic assay were explored by CIE Lab coordinates and UV–Vis absorption spectra. The effects of the anthocyanin content on the morphology, stiffness, air-permeability, and mechanical behavior of the aerogel-like wound dress were explored by various analytical methods. Both cytotoxicity and antibacterial activity of were investigated.

Preparation of carboxymethyl cellulose/chitosan-CuO giant vesicles for the adsorption and catalytic degradation of dyes

To effectively remove the dyes from wastewater, novel carboxymethyl cellulose/chitosan-CuO giant vesicles with dual function of adsorption and catalytic degradation were prepared. The vesicles were facilely obtained via blending chitosan solution and carboxymethyl cellulose/CuO mixed solution with sequent fast and slow stirring. The removal ratios of methyl orange (MO) and acid black-172 (AB) can reach 86.3% and 88.6% with the catalytic oxidation system of ammonium persulfate and vesicles. Compared with the CuO catalysis without the vesicles, the degradation rates of MO and AB increased by 1.3 and 3.1 times, respectively. The enhanced dye removal is ascribed to the excellent dye adsorption capacity of giant vesicles. Furthermore, the giant vesicles worked well in wide ranges of environmental pH and temperature, and exhibited excellent stability and reusability. This study provides a facile method to load catalyst onto polymeric giant vesicle with outstanding performance for the adsorption and catalytic degradation of dyes.

Preparation of carboxymethyl cellulose/graphene composite aerogel beads and their adsorption for methylene blue

Carboxymethyl cellulose/ graphene composite aerogel beads (CMC/GAs) were prepared by the easily scaling-up method, i.e., wet spinning- environmental pressure drying method. The influences of the type and concentration of coagulating bath on the formation of aerogel beads were discussed, and the forming mechanism was analyzed. The CMC/GAs was characterized through SEM, XRD, FI-IR, Raman, XPS, electronic universal testing machine and other methods. The CMC/GAs-30 has an average particle size and a mean pore diameter of 3.83 mm and 82 μm, respectively. The analysis results indicated that the adsorption mechanisms of CMC/GAs on methylene blue (MB) are mainly through the electrostatic interaction. The adsorption process conforms to the Langmuir model (R2 = 0.9964) and pseudo-second-order kinetic model (R2 is higher than 0.99). When the particle size of CMC/GAs-30 decreases, the equilibrium adsorption capacity for MB increases. Under the experimental conditions explored, the Langmuir maximum adsorption capacity of CMC/GAs-30 for MB is 222.72 mg.g−1. The CMC/GAs-30 show good recycle performance in MB adsorption. The removal rate of MB from water by CMC/GAs-30 remained at about 90% after 30-times adsorption- regeneration cycles.

Preparation of carboxymethyl chitosan/phytic acid composite hydrogels for rapid dye adsorption in wastewater treatment

In recent years, chitosan has been used as a common raw material to prepare hydrogels for wastewater treatment. In this work, a series of carboxymethyl chitosan/phytic acid (CMCS-PA) composite hydrogels with various amounts of PA were prepared to remove methyl orange (MO) and Congo red (CR) dyes from aqueous solution. The composite hydrogels with well-defined structure were characterized by different techniques. The experimental results revealed that the hydrogel possessed stable porous structure with more wrinkles on the surface due to the formation of intermolecular hydrogen bonding between CMCS and PA during the in-situ polymerization process. More importantly, the optimal adsorption conditions of CMCS-PA were obtained by changing different adsorption factors: ratio of two molecules and pH. And the CMCS-PA (3:1) composite hydrogel presented great adsorption capacity for MO (13.62 mg/g) and CR (8.49 mg/g) at pH = 7 at room temperature. In addition, the hydrogel also showed great adsorption reusability and stability. This work promotes further development in composite hydrogels design and their applications of wastewater treatment.

Preparation of carboxymethyl starch/polyvinyl-alcohol electrospun composite nanofibers from a green approach

A green approach for the preparation of starch-based composite nanofibers using electrospinning was developed. The water-soluble sodium carboxymethyl starch (CMS) with DS 0.31 was prepared. The addition of co-blending polymer polyvinyl-alcohol (PVA) was attempted to improve the CMS solution spinnability, which blends from aqueous solution were prepared at different CMS/PVA weight ratios. The solution parameters including viscosity, surface tension and conductivity were measured and the morphologies of nanofibers were observed by SEM. Smooth, continuous, and defect-free nanofibers were successfully obtained range from the blend of CMS/PVA weight ratios of 10:90 to 80:20. Diameter distribution diagrams suggested that the diameter of the nanofibers reduced with the concentration of CMS increasing. This is the first report that the thin nanofiber (135.29 nm) with bead-free was obtained at the maximal CMS content of 50.0 wt% in the CMS/PVA blend. This study provided a green approach to produce starch-based nano-scale fibers.

Preparation of carboxymethyl cellulose‐g‐poly (acrylamide)/montmorillonite superabsorbent composite as a slow‐release urea fertilizer

A superabsorbent composite was synthesized through free‐radical graft copolymerization of carboxymethyl cellulose, acrylamide, and montmorillonite by means of a crosslinker such as N,N′‐methylenebisacrylamide and potassium persulfate as an initiator. The preparation mechanism was proposed, and the composite structures were confirmed by using Fourier transform infrared spectroscopy, X‐ray diffraction, thermal gravimetric analysis, and scanning electron microscope. The factors influencing the swelling capacity of the composite were determined to accomplish the highly swelling capacity. The composition (15 wt% carboxymethyl cellulose, 5.4 wt% montmorillonite, 82 wt% acrylamide, 0.07 wt% N,N′‐methylenebisacrylamide, and 1.1 wt% potassium persulfate) exhibited high swelling capacity; it was selected to be loaded with urea fertilizer, and the release was investigated by measuring the conductivity. The results showed that the new controlled release system has good slow release properties.

Preparation of carboxymethyl chitosan/copper composites and their antibacterial properties

Water-soluble carboxymethyl chitosan/copper (CMCS/Cu) composites were first successfully prepared by solution reduction method. The CMCS/Cu composites presented flower-like architectures, consisting of several intercrossing sheets, and reaction conditions had an important effect on the morphology of resulting products. The antibacterial activities of CMCS/Cu composite against Staphylococcus aureus (S. aureus), Bacillus subtilis (B. subtilis), Escherichia coli (E. coli) and Pseudomonas aeruginosa (P. aeruginosa) were also performed by the minimum inhibitory concentration (MIC), the minimum bactericidal concentration (MBC), cup diffusion method and optical density (OD600). Results indicated that CMCS/Cu composites are selective in their antibacterial action. They display more effective antibacterial activity against B. subtilis than other three stains, and better bactericidal activity against S. aureus, E. coli and P. aeruginosa than B. subtilis. There is no bactericidal ability against B. subtilis in the tested concentration range, which indicates that B. subtilis may be a copper-tolerant bacterium.

Carboxymethylation of Cassia tora gum

AbstractThe preparation of carboxymethyl (CM)–Cassia tora gum (CTG) with monochloroacetic acid and sodium hydroxide was investigated under different reaction conditions. The carboxymethylation reaction was studied with respect to the degree of substitution of CM–CTG. The variables studied were the concentration of reactants, methanol–water ratio (solvent), reaction time, and reaction temperature. Carboxymethylation of CTG increased its solubility in cold water and the stability of its paste to microorganisms. Regardless of the degree of substitution of these products, their aqueous solutions were characterized by non‐Newtonian pseudoplastic behavior. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3216–3219, 2003

ChemInform Abstract: Analogues of 1D‐myo‐Inositol 1,2,6‐Trisphosphate. Preparation of Carboxymethyl and 2‐Hydroxyethyl Phosphate Derivatives.

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Analogues of 1D-Myo-Inositol 1,2,6-Trisphosphate. Preparation of Carboxymethyl and 2-Hydroxyethyl Phosphate Derivatives

ABSTRACT Acylation of 1D-myo-inositol 1,2,6-trisphosphate (α-trinositol) followed by alkylation of the phosphate groups with benzyl bromoacetate or 2-benzyloxyethyl iodide and deprotection provides a route to analogues with modified phosphate groups. The modifications made alter steric and ionisation properties but the possibility to participate in hydrogen bonding and ionic interaction is retained.