JOURNAL OF POLYMER RESEARCH
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2023
·Vol. 30
·期 8
·1-16
·
IF 2.8
Shi Liang,Liu Wenwu,Zhang Xiaomei,Hu Jingsong
Environmentally friendly crosslinked carboxymethyl cellulose-based hybrid hydrogels (CCMC/OMMT) were prepared from a grafting of 2-acrylamide-2-methylpropane sulfonic acid (AMPS) onto CCMC and reinforced with Organo-Montmorillonite (OMMT) in this study as efficient adsorbents for methylene blue (MB). FTIR, SEM, XRD, EDS, XPS, and TGA techniques have been employed to investigate the composition and shape of the setup hydrogels. The MB adsorption ability of CCMC/OMMT was investigated concerning the initial MB concentration, pH, interaction time, and temperature. The capacity of CCMC/OMMT to adsorb on MB was 490.5 mg/g at 313.15 K and pH 7.0. Furthermore, the adsorption kinetics and isotherm were accurately predicted using the pseudo-second-order dynamic theory and Langmuir isotherm theory. The estimated thermal parameters ΔG 0 , ΔH 0 , and ΔS 0 suggested that the molecules of MB binding on the CCMC/OMMT were spontaneous and endothermic. The procedures of sorption were facilitated by electrostatic attraction and hydrogen-bonding interaction. Additionally, all manufactured hydrogels were reusable for MB removal. As a result, CCMC/OMMT can be used as environmentally safe, productive, and washable stuff for MB in sewage treatment.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 21
·1-16
·
IF 2.8
Zi Xingfu,Wu Hongming,Song Jiling,Guo Guangping,Guo Jianbing
Cellulose-based gel electrolytes used in Li-ion batteries have poor interfacial compatibility, leading to poor cycle and rate performance. Herein, the preparation of a cellulose/polyethylene glycol dimethacrylate (PEGDA) gel electrolyte, with good cycle stability, is reported. The interfacial compatibility, electrolyte uptake, and thermal stability of the gel electrolyte could be adjusted by changing the PEGDA content of the gel electrolyte. The porosity changed with the PEGDA content and the electrolyte uptake rate increased from 383.49 to 932.57%. The interfacial resistance of the cellulose/PEGDA gel electrolyte was 97.24 Ω, while that of the pure cellulose was 565.06 Ω. This can be attributed to the added PEGDA, which hinders the hydroxy activity of the cellulose, thus, improving the electrode–electrolyte interface performance. The excellent interfacial compatibility and high porosity led to excellent cycle stability. The capacity retention rate of the assembled battery after 100 cycles, at 0.5 C, was as high as 96.8%. In addition, the high electrolyte uptake rate from the 3D porous structure also improved the ionic conductivity and Li-ion migration number of the cellulose/PEGDA gel electrolyte.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Shu-Fang Li,Jia-Hui Wu,Teng-Gen Hu,Hong Wu
In order to efficiently improve the colon-targeted delivery of quercetin , the hydrophobic core-shell nanofibers were fabricated to encapsulate quercetin using ethyl cellulose as the shell and zein as the core by coaxial electrospinning. The encapsulation efficiency of coaxial nanofibers reached >97 %. FTIR and XRD results revealed the interactions between quercetin and wall materials and quercetin was encapsulated in an amorphous state. The thermal stability and surface hydrophobicity of coaxial nanofibers were improved compared to the uniaxial zein fibers. After in vitro gastrointestinal digestion, the quercetin release from core-shell nanofibers was <12.38 %, while the corresponding value for zein fibers was 36.24 %. DPPH and FRAP assays showed that there was no significant difference in the antioxidant activity of quercetin before and after encapsulation. Furthermore, the encapsulated quercetin exhibited similar anti-proliferative activity against HCT-116 cells compared to the free form. The results suggest these coaxial nanofibers have potential applications in functional foods.
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PubMed
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CELLULOSE
·
2023
·Vol. 30
·期 12
·7853-7864
·
IF 5.7
Song Baiqing,Zhang Tianyi,Yang Kaili,Tian Guangming,Dang Yunzhi,Ma Jianhua
To realize the biocompatibility, mechanical strength, and sustained antibacterial properties of medical materials, it is feasible to introduce antibacterial material components into biomass matrix to prepare medical materials. Herein, zinc oxide (ZnO) was in-situ synthesized in bacterial cellulose (BC) dispersion and filtered into a film, and the BC/ZnO composite film was further immersed in sodium alginate (Alg) solution to construct the second layer structure. The microstructure, mechanical strength, and antibacterial properties of the composite films were investigated systematically. The tensile strength of the BC/ZnO/CAlg sample was achieved at 16.5 ± 2.4 MPa, much higher than that of the Zn 2+ crosslinked CAlg film of 11.5 ± 1.2 MPa. The Zn 2+ cross-linked Alg in the outer layer and the BC/ZnO composite film in the inner layer combined to create a synergistic effect. This secondary structure design ensures good hydrophilicity and hygroscopicity of the material which enables the sustained-release migration of Zn 2+ from the inner layer to the outer layer. Finally, the BC/ZnO/CAlg composite film possesses excellent antibacterial performance against Staphylococcus aureus and Escherichia coli. In addition, this work systematically expounds on the antibacterial and slow-release mechanism of secondary structure composite membranes. The results will provide a database and theoretical reference for applying BC/ZnO/CAlg composite membranes in the medical field.
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FUEL
·
2023
·
IF 7.4
Deng Zhao,Haoyuan Feng,Yu Wang,Fei Wang,Huashan Wang,Hua Liu,Hui Liu
The influence mechanism of alkali metal potassium (K) on cellulose pyrolysis is a vague and fundamental key topic in the field of biomass thermal conversion. In this study, the pyrolysis of cellulose and K-impregnated cellulose was compared by in-situ DRIFTS (Diffused Reflectance Infrared Fourier Transform Spectroscopy) and TG (Thermal Gravimetric)–MS (Mass Spectrum) experiment, and quantum chemical calculations were used to verify the peak position and pyrolysis mechanism of infrared (IR) spectroscopy. Stepwise isothermal in-situ DRIFTS was designed to study the reaction path at high temperatures. It was found that in the early stage of pyrolysis, K accelerated the activation of cellulose by attacking the hydrogen bond (H-bond) in the crystal structure of cellulose, increased the dehydration rate between molecules, and promoted the decomposition of cellulose. Simultaneously, it weakened the epoxy–ether bond, inhibited the formation of dehydrated sugar, and promoted the formation of furan. Subsequently, K combined with carbonyl groups to form C–O–K structures, which improved the thermal stability of certain oxygen-containing functional groups such as carbonyls/aldehydes, so that these structures were retained until higher temperature. K promoted the conversion of dehydrated sugars to straight-chain ketones/aldehydes, which led to an increase in carbon conversion. During the coke generation stage, K promoted the formation of disordered carbon and residues, thereby inhibiting coke aromatization. The isothermal in-situ DRIFTS method proposed in this study was demonstrated to better inhibit the high temperature drift of IR spectrum during pyrolysis. It clarified the conversion between functional groups at high temperatures, which is expected to promote the development of other high-temperature pyrolysis mechanism.
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Materials Today Communications
·
2023
·
IF 3.8
Lizhen Guo,Lei Zhang,Zhuomin Wang,Sasa Wang,Fuhao Dong
Long-active mechanical toughness, conductivity, and adhesiveness are essential in the applications of hydrogel bioelectronics. Existing approaches usually integrate different functional materials into one system to endow hydrogels with desired properties, which tends to suffer from poor compatibility, cumbersome operations, and unsustainable processes, seriously limiting their real-world applications. Herein, we report a one-step strategy for directly constructing polyacrylic acid/cellulose (PAA/Cel) ionogels with a combination of strong, tough, conductive, and adhesive properties by adding ZnCl 2 -dissolved cellulose in a facile, efficient, and environmentally friendly manner. The introduction of salt-dissolved cellulose can simultaneously realize the all-round improvement of the ionogel in terms of mechanics, conductivity and adhesion. Particularly, for the PAA/Cel-20 % ionogel, it has a 3.3-fold higher compressive strength (18.8 MPa vs. 4.4 MPa), a 17.2-fold higher fracture toughness (154.0 kJ m −3 vs. 8.5 kJ m −3 ), a 5.5-fold higher interfacial toughness (247.3 J m −2 vs. 45.0 J m −2 ), a 4.0-fold higher shear strength (394.5 kPa vs. 78.6 kPa), and a 29.9-fold higher ionic conductivity (74.1 mS m −1 vs. 2.4 mS m −1 ) compared to the PAA hydrogel. These improved mechanical and adhesive behaviors are due to the synergistic enhancement effect of the compact hydrogen bonds formed between the carboxyl groups (–COOH) of PAA and the hydroxyl groups (–OH) of Cel, as well as the coordination interactions produced by Zn 2+ and –COO − for PAA. The observed increase in ionic conductivity is attributed to the presence of abundant dissociated active ions including Zn 2+ and Cl − . Our resulting ionogel enables electrophysiological signals to be reliably recorded with high signal-to-noise ratios when assembled as bioelectronics for use in monitoring body movements. The strategy presented here facilitates the development of high-performance adhesive ionogels and could go beyond for bioelectronics in medical monitoring systems.
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Yongsheng Li,Chengnan Chu,Chuntao Chen,Bianjing Sun,Jingjing Wu,Shujun Wang,Weiwei Ding,Dongping Sun
Management of noncompressible torso hemorrhage is an urgent clinical requirement, desiring biomaterials with rapid hemostasis , anti-infection and excellent resilient properties. In this research, we have prepared a highly resilient cryogel with both hemostatic and antibacterial effects by chemical crosslinking and electrostatic interaction . The network structure crosslinked by quaternized chitosan and genipin was interspersed with oxidized bacterial cellulose after lyophilization. The as-prepared cryogel can quickly return to the original volume when soaking in water or blood. The appropriately sized pores in the cryogel help to absorb blood cells and further activate coagulation, while the quaternary ammonium salt groups on quaternized chitosan inhibit bacterial infections. Both cell and animal experiments showed that the cryogel was hypotoxic and could promote the regeneration of wound tissue. This research provides a new pathway for the preparation of double crosslinking cryogels and offers effective and safe biomaterials for the emergent bleeding management of incompressible wounds.
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Membranes
·
2023
·Vol. 13
·期 7
·651
·
IF 4.2
Lu Liu,Hongyang Ma,Madani Khan,Benjamin S. Hsiao
To achieve high throughput, low-pressure drops, and high adsorption capacity of Cr(VI) and Pb(II) in industrial wastewater treatment, cellulose membranes containing cationic and anionic groups were fabricated, respectively. In this process, cost-effective cotton fabrics were oxidized using sodium periodate, followed by quaternary ammonium or sulfonation modifications. The chemical composition, surface morphology, and thermal and mechanical properties of the cellulose membranes were investigated by ATR-FTIR, solid-state NMR, SEM, TGA, and tensile experiments. Quaternary ammonium, aldehyde, and sulfonate groups were distributed on the cationic/anionic cellulose fibers as adsorption sites, which issue remarkable adsorption capability to the cellulose membranes. The highly toxic Cr(VI) and Pb(II) ions were used to challenge the adsorption capacity of the cationic and anionic cellulose membranes, respectively. The maximum adsorption capacities of Cr(VI) and Pb(II) ions were 61.7 and 63.7 mg/g, respectively, suggested by Langmuir isotherms, kinetics, and thermodynamics in the static experiments. The dynamic adsorption capability of cationic cellulose membranes against Cr(VI) ions was determined and compared with that of commercially available anionic-exchange membranes. Spiral wound filtration cartridges were fabricated by cationic and anionic cellulose membranes, respectively, and were used to adsorb Cr(VI) and Pb(II) from lab-made wastewater, respectively. The cationic cellulose cartridge can purify 4.4 L of wastewater containing 1.0 mg/L of Cr(VI) ions with a 100% removal ratio, while the pressure drop was retained at 246 Pa. Similarly, the anionic cellulose cartridge exhibited even more impressive adsorption capability; the removal ratio against Pb(II) was 99% when 8.6 L of 1.0 mg/L of Pb(II) ions containing wastewater was treated, and the pressure drop was retained at 234 Pa. A composite cartridge fabricated by the integration of cationic and anionic cellulose membranes was successfully employed to purify the wastewater containing Cr(VI) and Pb(II) simultaneously. The possible adsorption mechanism was proposed, and the recycling ability of the cellulose membranes was also discussed.Keywords:cationic/anionic cellulose membrane;oxidation;adsorption;heavy metal ions;wastewater treatment
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yanai Chen,Yu Zhang,Limin Chang,Weichen Sun,Wenhao Duan,Jianglei Qin
Diabetic wound is considered as a kind of chronic wound prone to infection and difficult to repair due to high glucose level in the blood of patients. In this research, a biodegradable self-healing hydrogel with mussel inspired bioadhesion and anti-oxidation properties is fabricated based on Schiff-base cross-linking. The hydrogel was designed from dopamine coupled pectin hydrazide (Pec-DH) and oxidized carboxymethyl cellulose (DCMC) for mEGF loading as a diabetic wound repair dressing. The Pectin and CMC as natural feedstock endowed the hydrogel with biodegradability to avoid possible side effects, while the coupled catechol structure could enhance the tissue adhesion of the hydrogel for hemostasis . The results showed the Pec-DH/DCMC hydrogel formed fast and can cover irregular wounds with good sealing effect. The catechol structure also improved the reactive oxygen species (ROS) scavenging ability of the hydrogel, which can eliminate the negative effect of ROS during wound healing. The in vivo diabetic wound healing experiment revealed the hydrogel as mEGF loading vehicle greatly enhanced the diabetic wound repairing rate in mice model. As a result, the Pec-DH/DCMC hydrogel could show advantages as EGF carrier in wound healing applications.
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Biomolecules
·
2023
·Vol. 13
·期 5
·793
·
IF 5.5
Haiyan Liu,Yang Hu,Xiuping Wu,Rong Hu,Yingyu Liu
Bacterial cellulose (BC) has been widely used in tissue engineering due to its unique spatial structure and suitable biological properties. In this study, a small biologically active Arginine-Glycine-Aspartic acid-Serine (RGDS) tetrapeptide was incorporated on the porous BC surface followed by a low-energy CO2laser etching operation. As a result, different micropatterns were established on the BC surface with RGDS only anchored on the raised platform surface of the micropatterned BC (MPBC). Material characterization showed that all micropatterned structures exhibited platforms with a width of ~150 μm and grooves with a width of ~100 μm and a depth of ~300 μm, which displayed distinct hydrophilic and hydrophobic properties. The resulting RGDS-MPBC could hold the material integrity, as well as the microstructure morphology under a humid environment. In-vitro and in-vivo assays on cell migration, collagen deposition, and histological analysis revealed that micropatterns led to significant impacts on wound healing progress compared to the BC without surface-engineered micropatterns. Specifically, the basket-woven micropattern etched on the BC surface exhibited the optimal wound healing outcome with the presence of fewer macrophages and the least scar formation. This study further addresses the potential of adopting surface micropatterning strategies to promote skin wounds towards scar-free outcomes.Keywords:bacterial cellulose;lithography;micropatterns optimization;scar-free
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Juzhao Liu,Qiang Yuan,Guoyin Kai,Yujie Fu,Qi Cui
In this study, the porous cellulose microsphere carrier based on traditional Chinese medicine waste was successfully used to prepare a molecularly imprinted polymer (SPCC-CSL-MIPs) with specific selectivity for celastrol. Fourier transform infrared spectroscopy , scanning electron microscope , thermogravimetry , X-ray diffraction and binding experiments were performed to investigate and analyze the structure and adsorption performance of SPCC-CSL-MIPs. The experimental results showed that the SPCC-CSL-MIPs possessed a high adsorption capacity of 14.38 mg/g and a good imprinting factor of 2.36. Furthermore, the SPCC-CSL-MIPs could maintain a stable adsorption performance of 77.98% after 5 cycles. The above results indicated that the prepared SPCC-CSL-MIPs can be employed as an excellent adsorbent for ready and efficient celastrol enrichment and separation, and the content of celastrol in T. wilfordii extract was vastly increased from 0.46% to 3.87%, which proved that SPCC-CSL-MIPs exhibited the excellent ability of specific targeted enrichment and separation of celastrol from the complex matrix.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Miao Wang,Shuai Zhang,Xiangjun Liu,Yayun Ma,Junqi Wang
A comprehensive study of alkali and alkaline earth metal (AAEM) salts including two different anions (Cl - and CH 3 COO - ) in the catalytic pyrolysis of cellulose to produce levoglucosan (LG), bio-oil, and biochar were investigated. At the same time, the catalytic pyrolysis mechanism was also speculated. The thermogravimetric analyzer (TGA) and lab-scale fixed-bed reactor system were used to determine the thermal degradation process and the pyrolysis products of LG, bio-oil, and biochar. The optimized pyrolysis parameters were obtained by using Box-Behnken design-response surface method. According to the results, AAEM salts significantly boosted the yield of biochar, as well as greatly cut down the output of LG and bio-oil. The rank of effect on LG yield was as follows: CaCl 2 , MgCl 2 > CH 3 COOK, CH 3 COONa > (CH 3 COO) 2 Mg, (CH 3 COO) 2 Ca > KCl, NaCl. Moreover, the addition of AAEM salts considerably dropped the activation energy E of cellulose pyrolysis as well as prompted microcrystalline cellulose pyrolysis under lower temperatures. This study was pivotal in deducing the pathway of cellulose pyrolysis, thereby offering critical insights to hasten the progress of biomass utilization.
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