JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Nan Li,Zhi Wang,Jixiao Wang
Developing efficient membrane technology for CO 2 capture has aroused wide interest for environment conservation and emission reduction. Developing facilitated transport membranes is a potential strategy for improving CO 2 permeance and CO 2 /N 2 selectivity synchronously, based on the reversible reactions among carriers and CO 2 molecules. The reaction activity can be optimized by tuning the carrier mobility due to the enhanced water-swelling capacity. Here, thin-film composite (TFC) membranes containing water-swelling carboxymethyl chitosan (CMC) chains were prepared via interfacial polymerization process, aiming to improve CO 2 separation performance. As-prepared TFC membranes with different CMC loading have exhibited different Turing nanostructures , such as corrugated structures, octopus-branched structures and nodular structures. Water can enhance the activity of carriers in reversible reaction for facilitated transport membranes. TFC membranes with CMC have exhibited the enhanced water-swelling capacity, showing high CO 2 permeance of 1278 GPU together with CO 2 /N 2 selectivity of 89. This work put forward a simple and effective method to tune the membrane structure and enhance the facilitated transport.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2012
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IF 1.289
Di Zhao,JianFeng Xu,Lu Wang,JianJia Du,KeDong Dong,CaiFei Wang,XiangDong Liu
Two phosphorylated chitosan derivatives with a similar degree of substitution of about 0.5 were synthesized via either the esterification of chitosan's hydroxyl groups by P 2 O 5 in methanesulfonic acid or the selective incorporation of methylene phosphonic groups on chitosan's amino groups by formaldehyde/H 3 PO 3 in water. The performances of the resulting O -phosphorylated chitosan (OPC) and N -methylene phosphonic chitosan (NMPC) as amphoteric flocculants were assessed in comparison with that of unmodified chitosan. In turbidity removal experiments using kaolin suspensions in water, OPC removed about 90% turbidity, but NMPC only removed 60%. The lower flocculation efficiency of NMPC was attributed to the decreased acid strength of the N -methylene phosphate groups in NMPC. These results revealed that the acidity of the phosphate groups introduced in the modified chitosans is an important factor with regard to the flocculation efficiency, and consequently that O-phosphorylation is more suitable than N-phosphorylation for preparing chitosan-based amphoteric flocculants. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
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CARBOHYDRATE POLYMERS
·
2024
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IF 10.7
Xueyan Li,Suya Li,Chong Peng,Yuanfei Wang,Yun Li,Shuyi Yang,E. Tao
To avoid the environmental detriment caused by Cr(VI) waste, this study constructs a dual cross-linking network structure using sodium alginate (SA) and polyvinyl alcohol (PVA). Chitosan (CS) is further introduced through electrostatic attraction and hydrogen bonding and SA/PVA/CS (SPC) composite with porous structure is successfully prepared for the removal of Cr(VI) from wastewater. Batch adsorption experiments show that SPC has excellent adsorption capacity and practical usability with a broad pH applicability range. Under optimal adsorption conditions (pH = 2, t = 150 min, T = 35 °C, m/ V = 2 g/L, C 0 = 10 mg/L), the Cr(VI) removal rate of SPC achieves 89.2 %. Adsorption kinetics and isotherm models indicate that the adsorption process is primarily multi-layer and chemical adsorption. Additionally, FT-IR and XPS reveal that the adsorption mechanism of SPC for Cr(VI) involves a synergy of electrostatic attraction, reduction, ion exchange and complexation. Density functional theory (DFT) simulations also confirm the dominant role of CS in the Cr(VI) adsorption. In summary, SPC shows great potential for Cr(VI) wastewater treatment.
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BMC Chemistry
·
2023
·Vol. 17
·期 1
·1-14
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IF 4.6
Wei Jia,Yan Luchun,Zhang Zhifang,Hu Bing,Gui Wenjun,Cui Yanjun
Acid red 73 is an azo dye, and its residue can pollute the environment and seriously threaten human health and life. In this study, glutaraldehyde was used as the crosslinking agent, chitosan and polyvinyl alcohol were crosslinked under appropriate conditions to obtain a chitosan hydrogel film, and carbon nanotubes were dispersed in the chitosan hydrogel film. The FTIR, XRD, BET, SEM were applied to chatacterize the structure and the morphology of the absorbent and results showed that when the mass fraction of the carbon nanotubes was 1%, the structure was a three-dimensional network with microporous, and the water absorption reached to the maximum value of 266.07% and the elongation at break reached to a maximum of 98.87%. The ability to remove acid red 73 from aqueous and soil environments was evaluated by UV. In the aqueous samples, 70 mg of the adsorbent reached a saturated adsorption capacity of 101.07 mg/g and a removal rate of 92.23% at pH = 5. The thermodynamics conformed with the Langmuir adsorption isotherm and pseudo second-order adsorption kinetic models. In the soil samples, 100 mg of the adsorbent reached an adsorption capacity of 24.73 mg/g and removal rate of 49.45%. When the pH of the soil is between 4 and 7, the removal rate and adsorption capacity do not change much; hence, the pH should be maintained between 5.2 and 6.8, which is extremely suitable for the growth of general plants. Moreover, the experimental results demonstrated that the adsorbent maintained a good removal rate of acid red 73 over six adsorption cycles. Graphical
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APPLIED SURFACE SCIENCE
·
2016
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IF 3.15
Yizhou Zhu,Xiangmei Liu,Kelvin W.K. Yeung,Paul K. Chu,Shuilin Wu
One-dimensional (1D) nanostructures of ZnO using atomic layer deposition (ALD) on chitosan (CS) modified carbon nanotubes (CNTs) were first introduced onto the surfaces of biomedical implants. When the content of ZnO is not sufficient, CNTs can strengthen the antibacterial activity against E. coli and S. aureus by 8% and 39%, respectively. CS can improve the cytocompatibility of CNTs and ZnO. The amount of Zn content can be controlled by changing the cycling numbers of ALD processes. This hybrid coating can not only endow medical implants with high self-antibacterial efficacy against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) of over 73% and 98%, respectively, but also regulate the proliferation and osteogenic differentiation of osteoblasts by controlling the amount of ZnO.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Qunna Xu,Yao Pu,Jiaqi Shi,Xiaoyu Xu,Jianzhong Ma
Natural food preservatives composed of environmentally-friendly, non-toxic, and biodegradable components have gradually become excellent alternatives to traditional food preservatives. This study developed a fully biomass-based, non-toxic, and eco-friendly food preservation material by encapsulating oregano essential oil (OEO) in self-assembled casein (CA)/chitosan (CS) microcapsules crosslinked with tannic acid (TA) via multiple sites. OEO was successfully encapsulated with an efficiency of 92.5 %. Structural analysis revealed that TA crosslinking significantly altered the secondary structure of casein (increasing α-helix content) and enhanced thermal stability. In food-simulating media, the microcapsules exhibited sustained OEO release across four typical environments, confirming their potential for extensive food preservation applications. The microencapsulated emulsion exhibited prolonged antioxidant and antibacterial activities compared with free OEO. Fruit preservation tests verified that the emulsion effectively extended the shelf life of perishable fruits under ambient conditions. Notably, the use of food-grade materials and a TA-mediated multipoint cross-linking strategy not only enhanced microcapsule stability but also offers an innovative approach for developing safe and sustainable food preservatives.
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PubMed
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Jiahao Kang,Qiangli Zhao,Min Mao,Yugen Wang,Qiang Mu,Jie Tao,Xiaoliang Zhao,Xinhai He,Jianwei Li
Cellulose-based triboelectric materials present eco-friendly advantages but suffer from restricted electron transfer and humidity-induced charge loss due to inherent hydrogen-bond networks. Herein, a multi-network composite aerogel was fabricated using multi-scale entangled cellulose and regenerated chitosan fibers as a framework. Molecular-level chemical crosslinking, ionic complexation, and hydrogen bonding were integrated with freeze-induced structuring, solvent exchange, rapid desolvation, and ambient drying. The multi-crosslinked network delivers exceptional mechanical robustness (0.37 MPa stress at 50% strain), resilience, and moisture stability (intact structure after 40-day immersion). The aerogel-based triboelectric nanogenerator (TENG) demonstrated high triboelectric outputs (205.8 V, 581.16 mW/m 2 ), fatigue resistance (5000 cycles), humidity responsiveness (70–90% RH), broad humidity adaptability (40–90% RH), wet-environment durability (6800 cycles at 80% RH), and reversible humidity cycling, alongside stable acoustic/electrical signal recognition. The aerogel exhibited recyclability and biodegradability. This work establishes a green manufacturing paradigm for biomass aerogels, bridging sustainable materials engineering with self-powered environmental sensing technologies.
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Journal of Neurorestoratology
·
2025
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IF 3.4
Dapeng Zhao,Hengrui Li,Xiaoyu Wang,Ailing Yu,Lanhua Li,Baoliang Sun,Ying Wang,Guojun Wang,Jingyi Sun
Background Spinal cord injury (SCI), which often results from traumatic incidents, leads to neural damage and impaired sensory and motor functions and may pose a serious threat to life. Secondary injury mechanisms caused by persistent inflammation disrupt the local microenvironment, causing neuronal cell death and hindering neural regeneration. This study used a chitosan-citric acid (CS-CA) hydrogel as a carrier for Catalpol (CAT-CS-CA), which was directly applied to the injury site to promote SCI repair. Methods CAT-CS-CA and CS-CA hydrogels were characterized and implanted into rat SCI models. 24 male Sprague-Dawley rats (230–250 g) were randomly assigned to four groups ( n = 6 per group) using a randomization principle: sham operation group (laminectomy only), SCI group, CS-CA hydrogel group, and CAT-CS-CA hydrogel group. Neuronal nuclei (NeuN), β III-tubulin (Tuj1), glial fibrillary acidic protein (GFAP), macrophage polarization (M1/M2 markers), and hindlimb function (BBB score) were assessed. Results The CAT-CS-CA hydrogel retains CS-CA hydrogel's advantages and gains enhanced neuroprotective and anti-inflammatory abilities. The implantation of CAT-CS-CA into injured rat spinal cords enhanced neuronal survival, stimulated axonal regeneration, and significantly suppressed glial proliferation at the injury site. In addition, it promoted macrophage polarization to the M2 phenotype and substantially enhanced hindlimb motor function in rats with SCI. Conclusion CAT-CS-CA hydrogel promotes neuronal survival, suppresses glial scarring, and improves motor function, offering a promising strategy for SCI repair.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2025
·Vol. 142
·期 14
·e56693
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IF 2.8
Zi-Ang Xia,Long Wang,Chaojie Li,Xue Li,Jingxue Yang,Baoming Xu,Heng Zhang
The augmentation of chitosan's (CS) antioxidative and antibacterial properties via grafting with phenolic acids constitutes a significant method for expanding the utility of chitosan. In this investigation, four phenolic acids (gallic acid, GA; protocatechuic acid, PCA; hydroxybenzoic acid, HA; and salicylic acid, SA) were conjugated with CS utilizing carbodiimide (EDC)-mediated grafting. The resultant phenolic acid-CS graft copolymers underwent characterization employing infrared spectroscopy, x-ray diffraction, and thermogravimetric analysis. Furthermore, ex vivo antioxidative and antibacterial assays were performed. Findings revealed that among the synthesized phenolic acid-chitosan graft copolymers, gallic acid-chitosan (GA-CS) demonstrated the highest antioxidative and antibacterial efficacy, primarily attributed to its elevated grafting ratio and abundance of hydroxyl groups. The antioxidative and antibacterial performances of the remaining three graft copolymers followed this order: CS-PCA > CS-HA > CS-SA, aligning with the trend in grafting ratios. This correlation arises from the higher grafting ratios of copolymers yielding more active OH groups, thereby exhibiting enhanced antioxidative and antibacterial properties. Phenolic acid-chitosan graft polymers exhibit promising antioxidative and antibacterial attributes, making them suitable additives for application in the food preservation packaging industry.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Chujing Wang,Zengliu Song,Xinyue Ning,Yong Wang,Jie Xiao
Chitosan-coated nanostructured lipid carriers (CS-NLCs) were engineered to overcome the gastrointestinal instability and limited absorption of glycerol distearate (GDS)/medium-chain triglyceride (MCT)-based NLCs. Using a dropwise coating method, we systematically evaluated the impact of chitosan coating on digestive stability and intestinal permeability through in vitro digestion models, Ussing chamber assays, and confocal laser scanning microscopy (CLSM). The results indicate that Chitosan coating improved NLCs’ storage stability (except G2M8 formulation). CS-NLCs exhibited more complete digestion (the maximum fatty acid released within 20 minutes versus 30 minutes for uncoated NLCs), with Turbiscan analysis demonstrating an increase in initial digestion rate compared to uncoated NLCs, though chitosan-induced flocculation reduced small intestinal permeability (52% lower apparent permeability coefficient in Ussing chambers). CLSM imaging identified a critical solid lipid threshold (>50%) for chitosan-mediated adhesion enhancement, with 80% solid lipid CS-NLCs showing 1.6-fold higher mucus adhesion due to incomplete chitosan degradation and increased particle size (from 747 nm to 16μm). Pharmacokinetic studies in rats confirmed that CS-NLCs with >50% solid lipid achieved 1.8-fold higher curcumin bioavailability versus uncoated counterparts. This study highlights the critical role of chitosan coating in optimizing the bioavailability of lipid-based nutraceuticals in the gastrointestinal tract.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Rui Huang,Lizhi Lin,Jinghua Zhang,Shaohua Jin,Qingquan Tian,Ziming Yang,Puwang Li,Yu Chen
Dihydroxylammonium 5, 5′-bistetrazole-1, 1′-diolate (TKX-50) is a new high-energy and insensitive material with broad application prospects. However, the discharge of TKX-50 wastewater from its production and applications not only causes the waste of high-value explosives, but also pollutes the environment. The traditional used adsorbents are poor adsorption efficiencies and recyclability performance in pratical applications. In this study, we successfully prepared a porous polyurethane/chitosan hybrid foam (PUF) with chitosan (CTS) as the active adsorption component by the semi-prepolymerization/acidification method. The compressive strength of the PUF can reach up to 8.83 kPa, and the static adsorption capacity of TKX-50 can reach 39.32 mg/g. The TKX-50 adsorption process and mechanism were further studied by the adsorption kinetics, isotherm and thermodynamics. The adsorbed TKX-50 was effectively recovered by NaOH solution, with a desorption rate exceeding 94 %. The dynamic adsorption investigation indicates that the PUF is suitable for industrial continuous flow wastewater treatment process in practical engineering. In all, our work has explored a new construction strategy of chitosan composited recyclable polyurethane hybrid foam materials with high TKX-50 adsorption efficiencies, and the obtained hybrid foam exhibits great application potentials for the treatment of TKX-50-containing wastewaters.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Perumal Ramesh Kannan,Supaporn Sangkert,Caiying Jiang,Yao Li,Ruibo Zhao,M. Zubair Iqbal,Xiangdong Kong
Biomaterials derived from natural polymers have raised much attention for use in bone tissue engineering applications because of their high mechanical strength and biocompatibility. However, challenges persist in developing bone materials with the requisite physicochemical and osteogenic properties. In this study, the freeze-drying method fabricated a scaffold using chitosan and fucoidan reinforced with zinc oxide nanoparticles (CSFU@ZnO). The scaffolds were characterized and evaluated for their osteogenic differentiation, proliferation, and viability of pre-osteoblast cells (MC3T3-E1). Field emission-scanning electron microscopy analysis revealed a porous morphology with interconnected pores and hydrogen bond interaction between chitosan and fucoidan, as confirmed by Fourier transform infrared spectroscopy analysis. The combination of fucoidan with chitosan improved the mechanical properties, swelling capacity, and degradability. The CSFU@ZnO scaffold effectively inhibited the growth of S. aureus and E. coli , as shown by a zone of inhibition assay. In vitro studies revealed enhanced MC3T3-E1 viability, proliferation, and adhesion, as validated by SEM analysis. The osteogenic differentiation of the CSFU@ZnO scaffold showed increased alkaline phosphatase activity, better protein adsorption, and improved bone mineralization compared to the chitosan scaffold. These findings suggest that the ZnO nanoparticle-incorporated chitosan and fucoidan scaffold could be a good and viable material for bone tissue engineering.
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