SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Qin Tang,Zhengyu Yang,Huihui Zheng,Liheng Zhang,Ye Xiao,Yetao Tang,Rongliang Qiu
Adsorption remains a promising approach for the remediation of hexavalent chromium, Cr(VI), contaminations in both aqueous and soil environment, where adsorption performance, including capacity, affinity, and selectivity, is governed by the surface properties of the adsorbent. In this study, a phosphorus modified chitosan (PMC) adsorbent was synthesized via a facile reaction between chitosan and tetrakis(hydroxymethyl)phosphonium (THP), incorporating 5.5 wt% phosphorus as phosphonium groups. The resulting PMC exhibited superior Cr(VI) adsorption performance compared to pristine chitosan, demonstrating higher adsorption capacity (161.94 mg/g) and stronger affinity (Langmuir constant of 0.75 L/mg), enabling exceptional selectivity in the presence of competing anions of Cl − , NO 3 − , H 2 PO 4 − , and SO 4 2− . Despite its low regenerability (up to 50 % in the third cycle), PMC successfully applied in Cr(VI) contaminated soil remediation reaching fixation efficiency of 98.8 %. Detailed characterization via XPS, FTIR, and SEM-EDS revealed that Cr(VI) removal primarily occurs through ion exchange, with partial reduction (∼14 %) to Cr(III). Density functional theory (DFT) calculations further demonstrated that the adsorption mechanism is driven by strong electrostatic interactions facilitated by multiple hydrogen bonds between oxygen atoms in Cr(VI) anions and hydrogen atoms from both chitosan hydroxyl groups and THP moieties. These findings provide fundamental insights into the adsorption mechanism and offer valuable guidance for designing high-performance Cr(VI) adsorbents for practical applications in complex environmental matrices.
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高影响因子
CELLULOSE
·
2024
·Vol. 31
·期 6
·3607-3622
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IF 4.9
Chen Yu,Chen Jingyu,Chen Kunlin,Qiu Hua
Hydrogels are effective wound dressings because of their capacity to promptly absorb wound exudate and maintain a moist environment for healing. In this work, an antibacterial hydrogel was prepared by freeze–thaw cycling based on polyvinyl alcohol/chitosan/iron–copper–zinc oxide nanocomposite. The hydrogels were characterized using various methods, including Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, and field emission scanning electron microscopy. The hydrogels were analyzed for porosity, gel content, water vapour transmission rate, swelling rate, water retention rate, contact angle, and mechanical properties. The effect of the PVA: CS ratio on the mechanical properties and bacterial inhibition zone of hydrogels was particularly analyzed. The antibacterial activity of nano-ZnO, nano copper–zinc, and nano iron copper zinc oxide was qualitatively compared using the zone of inhibition test, and the antibacterial rate of the corresponding hydrogel was quantitatively analyzed using the shake flask method. Cell viability was assayed by using the Cell Counting Kit-8 method, in which NIH3T3 cells were directly incubated together with hydrogel samples to detect the change in cell viability after 24 h. Results indicate that the prepared hydrogels possess excellent biocompatibility, antibacterial rate, porous structure, high swelling rate, and good water retention capacity, making them a potential material for wound dressings. Graphical abstract
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高影响因子
APPLIED SURFACE SCIENCE
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2013
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IF 2.112
Hualin Jiang,Pinghua Chen,Shenglian Luo,Xinman Tu,Qun Cao,Meng Shu
A novel nanocomposite with a BET surface area of 212.9 m 2 /g was synthesized from chitosan and Fe 3 O 4 /ZrO 2 using an inexpensive protocol at mild condition. The Fe 3 O 4 /ZrO 2 /chitosan composite has the ability to adsorb both nitrate and phosphate. The maximum adsorption amount of nitrate and phosphate is 89.3 mg/g and 26.5 mg P/g, respectively. The adsorption process fits well to the pseudo-first-order kinetic rate model, and the mechanism involves simultaneous adsorption and intra-particle diffusion. The experimental results suggest that the composite is a promising adsorbent for treating water that is contaminated with nutrients.
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高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Haoxiang Zhong,Aiqin He,Jidian Lu,Minghao Sun,Jiarong He,Lingzhi Zhang
A water-soluble conductive composite binder consisting of carboxymethyl chitosan (CCTS) as a binder and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as a conduction-promoting agent is reported for the LiFePO 4 (LFP) cathode in Li-ion batteries. The introduction of conductive PEDOT:PSS as a conductive composite binder facilitates the formation of homogeneous and continuous conducting bridges throughout the electrode and raises the compaction density of the electrode sheet by decreasing the amounts of the commonly used conducting agent of acetylene black. The optimized replacement ratios of acetylene black with PEDOT:PSS (acetylene black/PEDOT:PSS = 1:1, by weight) are obtained by measuring electrical conductivity , peel strength and compaction density of the electrode sheets. The LFP half-cell with the optimized conductive binder exhibits better cycling and rate performance and more favorable electrochemical kinetics than that using only acetylene black conducting agent. The pilot application of PEDOT:PSS/CCTS binder in 10 Ah CCTS-LFP prismatic cell exhibits a comparable cycling performance, retaining 89.7% of capacity at 1 C/2 C (charge/discharge) rate as compared with 90% for commercial PVDF-LFP over 1000 cycles, and better rate capability than that of commercial PVDF-LFP, retaining 98% capacity of 1 C at 7 C rate as compared with 95.4% for PVDF-LFP.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yongjun Sun,Kinjal J. Shah,Wenquan Sun,Huaili Zheng
Dual-function chitosan-based flocculants with chelation and flocculation capacity, carboxylated chitosan-graft-polyacrylamide (PCA), carboxylated chitosan-graft-polyacrylamide-co-sodium xanthate (PCAXC), and carboxylated chitosan-graft-poly(acrylamide-2-acrylamido-2-methylpropane sulfonic acid) (PCAAF), are designed and prepared by UV initiation method. The physicochemical characteristics of PCA, PCAXC, and PCAAF were characterized by fourier transform infrared spectroscopy, 1 H nuclear magnetic resonance, and X-ray diffraction pattern to confirm the successful syntheses. Then PCA, PCAXC, and PCAAF are applied to chelate and flocculate Cu, Cr, and Ni from water. Effects of pH, flocculants dosage, reaction time, and stirring speed were investigated systematically to detect the relationship between flocculants structural and chelation-flocculation capacity. The maximum removal rate of Cu and Cr obtained by PCAXC at are 85.1% and 76.1%, respectively, while The maximum removal rate of Ni obtained by PCAAF at is more than 75.7%%. In addition, the relationship between the initial concentration of simulated heavy metal wastewater and the flocculants dosage and the competitive chelation-flocculation properties in the mixed heavy metal solution are also detected in detail. The mechanism can be assigned to the effective interaction between function groups of the flocculants and heavy metal irons by chelation, charge neutralization, and adsorption bridging mechanism.
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高影响因子
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
·
2025
·
IF 5.8
Dahao Ji,Abdulaziz Alasiri,Yuefeng Zhang,Xiong Zheng
To overcome the critical limitations of conventional phase change composites (PCCs)—including low thermal anisotropy, phase change material (PCM) leakage, and inefficient photo-thermal conversion—we develop a hierarchically engineered PCC by integrating chitosan (CS) aerogel, unidirectionally aligned carbon fibers (CFs), and polyethylene glycol (PEG2000). The CS aerogel matrix suppresses PEG leakage via hydrogen-bonding networks while enabling directional CF alignment, achieving record axial thermal conductivity (6.61 W·m⁻¹·K⁻¹) and exceptional anisotropy (ratio: 11.9). Despite reduced PEG loading with CF content, the composites retain high latent heat (136.6 kJ·kg⁻¹ at 15 wt% CFs) and mechanical robustness. The aligned CF network synergistically enhances broadband solar absorption and directional heat transfer, enabling ultrahigh solar-thermal efficiency (98.5 % at 3.0 sun irradiation). Remarkably, the system exhibits excellent cyclic stability and outdoor operational reliability. This work establishes a scalable paradigm for sustainable thermal energy storage by concurrently resolving the trade-offs among PCM encapsulation, anisotropic thermal management, and photo-thermal conversion.
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高影响因子
FOOD RESEARCH INTERNATIONAL
·
2012
·
IF 3.15
Weijuan Huang,Huijinlan Xu,Yue Xue,Rong Huang,Hongbing Deng,Siyi Pan
Negatively charged electrospun cellulose acetate (CA) fibrous mats were modified with multilayers of the positively charged lysozyme (LY)–chitosan (CS)–organic rectorite (OREC) composites and the negatively charged sodium alginate (ALG) via layer-by-layer (LBL) self-assembly technique. The morphology and antibacterial activity of the resultant samples were investigated by regulating the number of deposition bilayers, the composition of coating bilayers and the outermost layer. Field emission scanning electron microscopy images indicated that the average diameter of LY–CS–OREC/ALG film coating was larger than that of LY–CS/ALG film coating. X-ray photoelectron spectroscopy results implied that LY and OREC were successfully deposited on CA fibers. The LBL structured fibrous mats with the addition of OREC could enhance the degree of inhibition against Escherichia coli and Staphylococcus aureus . (LY–CS–OREC/ALG) 10.5 film coating with the best antibacterial activity, selected for preserving pork for 21 days, could extend the shelf-life of pork for about 3 days.
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高影响因子
ACS Applied Polymer Materials
·
2026
·Vol. 8
·期 14
·12080-12097
·
IF 5.2
Wang Yiran,Gao Liwen,Cao Lulu,Zhang Long,Zhang Hejin,Li Junyin,Tong Zhaohui,Wang Keran,Yang Yuechao,Zhang Shugang
In this work, a castor oil-based
polyurethane-based controlled-release
urea modified with dehydroabietic acid-grafted chitosan was prepared,
overcoming the poor hydrophobicity of traditional coatings. Dehydroabietic
acid-grafted chitosan (HNCSDA) was synthesized and incorporated into
castor oil-based polyurethane to fabricate modified coated fertilizers.
The chemical structure, micromorphology, thermal stability, hydrophobicity,
nitrogen release, phytotoxicity and antifungal performance of the
coatings were systematically characterized. HNCSDA improved coating
compactness and continuity, reduced structural defects and formed
an effective diffusion barrier. Increasing the HNCSDA dosage from
0% to 20% increased the hydrophobicity and thermal stability of the
coating; the water contact angle increased from 80.6 ° to 116.7 ° ,
and the release longevity increased by 15.54%. In the absence of maize
phytotoxicity and effectiveness against Botrytis cinerea and Rhizoctonia solani , the modified coatings increase
seedling growth, offering a feasible route to eco-friendly biobased
slow-release antifungal fertilizers for sustainable agriculture.
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高影响因子
FOOD MICROBIOLOGY
·
2026
·
IF 5.4
Shuxuan Li,Jing Li,Ming Zhang,Rundong Wang,Xiaoni Wang,Chunyan Li,Defu Zhang
Refrigerated aquatic products are prone to microbial spoilage, while traditional preservation methods have insufficient antibacterial activity or residual risks. To address these issues, this research fabricated a novel composite preservative coating using matrix composed of chitosan (CS) and sodium alginate (ALG), together with bioactive antibacterial phage-derived holin–endolysin(Hol49_Lys19, HL) fusion protein. Structural characterization using scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction confirmed that HL formed stable interactions with CS/ALG, and resulted in a dense and uniform structure. The coating exhibited enhanced mechanical properties (tensile strength = 75.5 ± 3.8 MPa), thermal stability (T max = 286.5 °C), and moisture barrier capacity (water vapor transmission rate = 68.49 g/(m 2 ·d)). It inhibited the growth of 99.97% Aeromonas hydrophila compared with the control and excellent biocompatibility (cell viability >88%). The application of the coating onto refrigerated salmon (4 °C) effectively inhibited microbial proliferation (total viable count <7 Log 10 CFU/g at 12 days), lipid oxidation (thiobarbituric acid reactive substances ≤1.35 mg malondialdehyde/kg), and protein decomposition (total volatile basic nitrogen = 20.72 mg/100 g at 12 days), and it maintained pH stability, high water-holding capacity, and texture integrity. The coating extended the salmon shelf life by at least 6 days. This study integrates the physical barrier of natural polysaccharides with the targeted antibacterial activity of phage-derived proteins, and provides a green and efficient solution to preserve aquatic products and advance the application of phage-derived substances in the food industry.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Li Zhao,Yunchun Li,Jinyu Wang,Xubing Sun,Yuan Peng,Xianyao Feng,Jiangrui Zhao,Jinwei Zhang,Yang He,Xuchu Shi,Liyuan Zhang,Yaohui You
Conductive hydrogels have garnered tremendous focus owing to their potential applications in flexible electronics. However, conventional conductive hydrogels often face limitations such as freezing at low temperatures, dehydration in dry environments, lack of antibacterial activity, and poor mechanical stability, which significantly restrict their practical applications in flexible electronics. To address these challenges, a multifunctional zwitterionic conductive hydrogel was developed by proportionally integrating phytic acid (PA), carboxymethyl chitosan (CMCS), sulfobetaine methacrylate (SBMA) and acrylamide. The acquired hydrogel network was constructed by hydrogen bonds and electrostatic interaction. The incorporation of CMCS made the hydrogel with higher mechanical property. The introduction of PA imparted the hydrogel good anti-freezing, water retention, antibacterial and ionic conductivity characteristics. Additionally, the hydrogel also exhibited good adhesion effect (maximum adhesion strength of 17.6 kPa to pig skin) and self-healing performance (stress healing efficiency of 82%) at room and low temperatures. The prepared multifunctional hydrogel not only demonstrated thermal response performance, but also could be designed as flexible sensor for monitoring human actions and assembled as an electrode for detecting the electromyogram signals of the human body. This work provides a strategy to design a functional-integrated hydrogel that is anticipated to serve as a flexible electronic product for the next generation. Download: Download high-res image (242KB) Download: Download full-size image
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2026
·
IF 8.7
Lu Cai,Hongkai Wang,Qian Yang,Yanting Yi,Xinlan Jiang,Li Dai,Jialiang Li,Zhengyuan Zhou,Ziyin Li,Bingbing Li,Tianchi Zhou
Highlight 1: Zwitterion-modified chitosan creates electrostatic crosslinks for balanced OH⁻ conductivity and dimensional stability, enabling CS@SBA150 to attain 81.0 mS cm −1 at 80 °C alongside a low 26.2% swelling ratio. • Highlight 2: The CS@SBA150 membrane retains 94.1% of its initial conductivity after 216 h immersion in 6 M KOH, with 91.3% elongation and stable structure under deformation and loading. • Highlight 3: Excellent performance in practical rechargeable zinc-air battery application. The rechargeable zinc-air battery (RZAB) assembled with CS@SBA150 membrane delivers a high peak power density of 150.4 mW cm −2 , maintains stable discharge at 1.20 V for over 3 h at a current density of 5 mA cm −2 , and exhibits a long charge-discharge cycle life of 14 h. Moreover, the battery can stably power an LED display module, verifying its great practical application potential in energy storage devices.The assembled zinc-air battery with CS@SBA150 membrane achieves a peak density of 150.4 mW cm −2 , maintains stable discharge at 1.20 V for over 3 h, and exhibits a charge-discharge cycle life of 14 h. The commercialization of rechargeable zinc-air batteries (RZABs) is still limited by the conductivity-stability trade-off in anion exchange membranes (AEMs). To address this challenge, a series of zwitterionic sulfobetaine-modified chitosan AEMs (CS@SBAx) were synthesized via covalent grafting, and the effect of sulfobetaine (SBA) loading on the comprehensive performance of the membranes was systematically investigated. FT-IR and XPS confirms the successful modification, and electrostatic interactions among the zwitterionic side-chains constructs a physical crosslinking network that effectively inhibits membrane swelling. Among all prepared membranes, CS@SBA150 delivers a high OH − conductivity of 81.0 mS cm −1 at 80 °C and a suppressed swelling ratio of 26.2%. Impressively, it exhibits remarkable long-term alkaline stability, with 94.1% of the initial conductivity preserved after 216 h exposure to 6 M KOH solution at 25 °C. Molecular dynamics simulations and density functional theory calculations reveal that surface hopping, synergistically assisted by Grotthuss transfer and a weak Vehicle-type transport, endows the CS@SBA150 membrane with elevated conductivity at low water uptake. RZABs assembled with the CS@SBA150 membrane delivers a peak power density of 150.4 mW cm −2 , maintains stable discharge at 1.20 V for over 3 h, and exhibits a charge-discharge cycle life of 14 h. This work provides a green and effective strategy for the design of biomass-derived AEMs with balanced conductivity and stability. In summary, this work presents a green and efficient strategy for the design of biomass-derived anion exchange membranes (AEMs) with well-balanced ionic conductivity and stability, suitable for sustainable energy conversion and storage applications. Download: Download high-res image (164KB) Download: Download full-size image
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PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2026
·
IF 13.8
Baoyi Zhang,Weijuan Huang
This study elucidates how the spatial distribution of carboxymethyl chitosan (CMCS) governs the architecture and properties of emulsion gels formed via reversible Schiff base linkages. A methodology centered on regulating the oil-water interfacial area was employed to manipulate CMCS distribution between the interface and the continuous phase. Multiscale characterization revealed that the macroscopic properties of this polysaccharide-based dynamic gel are predominantly governed by the continuous phase network, which is fundamentally distinct from interface-dominated protein-based gel systems. Specifically, increasing the interfacial area drove CMCS migration to the interface, reducing the effective cross-linking density in the continuous phase. This led to prolonged gelation, weaker gel strength, a more porous network, and enhanced water mobility. Interestingly, the reduced network density facilitated polymer chain diffusion, significantly accelerating the self-healing process. This work clarifies the dominant role of the continuous phase network in dynamic polysaccharide gels. It establishes a general methodology for programming material properties by controlling polymer spatial distribution. These insights provide a new paradigm for the rational design of functional soft materials.
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高影响因子
危险品化学品经营许可证（带存储）