CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Seongeom Jeong,Siyoung Byun,Sanghyun Jeong
A pH-responsive membrane represents a promising avenue for sustainable water treatment, yet its broader application remains limited by stability and reusability concerns. In this study, a polyvinyl alcohol/chitosan (PVA/CS) hydrogel membrane was fabricated and systematically evaluated for its pH-dependent transport behavior and dye removal performance. The hydrogel membrane exhibited distinct pH responsiveness, achieving the highest water flux (22.45 ± 0.66 L m −2 h −1 bar −1 ) at neutral pH (6.5) when tested using pure water. Flux declined under acidic conditions (3.43 ± 0.26 L m −2 h −1 bar −1 ) due to CS swelling and under alkaline conditions due to polymer chain densification. At pH 2, the membrane removed both cationic and anionic dyes with efficiencies exceeding 99.9 % removal. Under neutral conditions, cationic dyes (crystal violet, methylene blue) were consistently removed (>97 %). In contrast, anionic dyes, including Congo red and methyl orange, showed significantly lower rejection (66.04 % and 24.57 %, respectively), attributable to electrostatic repulsion and size-dependent transport. Importantly, the PVA/CS hydrogel membrane demonstrated regeneration capability, enabling up to three reuse cycles with >99 % dye rejection and limited flux decline for cationic dyes at pH 6.5. CS's reversible swelling-contraction behavior facilitated the recovery of membrane performance. Overall, these findings demonstrate that PVA/CS hydrogel membranes functions as pH-responsive separation platforms capable of chemical-free regeneration and limited reuse across a range of pH conditions. In particular, this study experimentally clarifies how intrinsic pH responsiveness can be leveraged to enable regeneration without chemical treatment, while also highlighting the need for further optimization to address performance limitations toward anionic contaminants.
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高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Renzhang Liang,Cuilian Yu,Dong Ma,Xiaohan Cao,Liying Bai,Yulan Li,Jingxian Zhang,Jiayue Liu,Xia Qiao,Bingren Tian
Curcumin, a polyphenolic compound, demonstrates neuroprotective potential through its antioxidant, anti-inflammatory, and anti-amyloid activities. To enhance its delivery, we fabricated poly(lactic-co-glycolic acid) (PLGA) nanoparticles encapsulating curcumin and stabilized them with chitosan. Successful formulation was confirmed by FTIR, XRD, and SEM analyses. Zeta potential measurement confirmed a surface charge reversal from -28.1 mV (uncoated PLGA) to + 14.7 mV after chitosan coating. The nanoparticles exhibited favorable drug loading (4.09 ± 0.02 % to 5.67 ± 0.01 %) and encapsulation efficiency (14.33 ± 0.08 % to 19.85 ± 0.04 %), and provided a sustained release profile (>24 h) enhanced by chitosan. The curcumin encapsulated PLGA-chitosan nanocarriers demonstrated potent antioxidant activity (>80 % DPPH scavenging at 0.75 mg/mL) and no significant cytotoxicity against PC12 cells at concentrations up to 80 μg/mL. In HCT116 cells, the chitosan coating enhanced cellular uptake and cytoplasmic distribution. Crucially, the nanocarriers promoted PC12 cells differentiation, resulting in a high proportion of neurite-bearing cells. These findings indicate that the designed chitosan-coated PLGA nanoparticles are a promising delivery system for promoting neuronal differentiation.
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高影响因子
FOOD HYDROCOLLOIDS
·
2023
·
IF 10.7
Wenmeng Liu,Long Chen,David Julian McClements,Yidong Zou,Guanxiong Chen,Zhengyu Jin
Modification of starch to realize the value-added utilization of starch is a hot research topic at present. In this study, the complex composed of chitosan, betaine and vanillin with different concentrations was used as a new starch modifier to modify corn starch based on special mechanism, and the gelatinization, rheological, gel, thermal characteristics and structural characteristics of starch gel were evaluated. The gelatinization results showed that chitosan, betaine and vanillin complex can significantly increase the viscosity of starch including peak, breakdown, final and setback viscosity, which proved its potential as a gel thickener. The results of rheological properties showed that the viscoelasticity of corn starch was significantly increased after modification. The gel characteristics also presented that the modifier can promote the gel formation and can be used as gelling agent. The thermal stability of modified corn starch was also significantly improved. FT-IR and XRD results show that chitosan, betaine and vanillin can improve starch properties mainly through hydrogen bond interaction, Schiff base crosslinking and electrostatic interaction. Moreover, SEM showed the microstructure of corn starch became more orderly and regular with the addition of modifiers. The results show that the complex of chitosan, betaine and vanillin can be used as a new gel thickener and stabilizer in the industry, and has the potential for improvement. This will provide theoretical reference for expanding the application scope of starch and realizing the value-added utilization of starch.
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高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 6
·1941-1949
·
IF 6.177
Yunhong Pi,Xiuting Wu,Zefeng Zheng,Liang Ma,Tiejun Wang
Methanol reforming in aqueous solution provides a significantly attractive and promising pathway to release hydrogen with mild H2 release conditions and high H2 storage capacity. Exploring non-noble metal-based catalysts with sufficiently high activity, stability, and selectivity for H2 remains a great challenge. We report here the construction of a chitosan–lignin (CS–LN) carbon framework bio-composite-encapsulated Cu catalyst (Cu@CS–LN) with high loading and dispersion for base-free hydrogen generation from aqueous-phase methanol reforming below 210 °C. With optimized conditions, the hydrogen generation rate of Cu@CS–LN (2.5 × 105 μmolH2 gCu−1 h−1) represents an approximately 2-fold enhancement compared with Cu@CS without lignin incorporation, and more than 3–5 times higher than commercial Cu-based catalysts such as Rainie Cu or CuO/ZnO. The catalyst underwent an intensified water gas shift reaction (WGSR), and it also exhibited extraordinary selectivity toward the CO byproduct. The unique carbon framework structure of CS–LN through electrostatic densification self-assembly not only enhanced the adsorption and dispersion of Cu species, but it also stabilized and further reduced the Cu particles to active phase Cu during the hydrogen generation reaction to promote catalytic activity and stability without obvious catalyst deactivation detected after running for 150 hours. This specific hydrogen production technology exhibits great potential for hydrogen-powered polymer electrolyte membrane (PEMFCs) fuel cells.
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高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Shuai Zhou,Yanxing Xie,Feiyu Zhu,Yuanyuan Gao,Yingjiu Liu,Zhenping Tang,Yi Duan
Graphene oxide (GO) and its composites are promising candidates for the adsorption of U(VI) in water. Whereas the high hydrophobicity and dispersibility of GO makes it hard to separate from aqueous solutions, and thus greatly restricts its practical application. To address this defect, a novel composite [i.e., poly(amidoxime)/GO/chitosan (PAO/GO/CS)] was prepared. Characterization including Fourier transform infrared spectroscopy , X-ray diffraction, and X-ray photoelectron spectroscopy confirmed that cross-linking reaction between GO and CS may consume oxygen-contained groups of GO. The resulting deficit in U(VI) adsorption may be compensated by the amidoxime grafted onto the surface of GO/CS. Langmuir model showed that the maximum adsorption capacity of U(VI) by PAO/GO/CS was up to 701.5, 821.7, and 1220.0 mg/g, respectively, under 293, 303, and 313 K at pH 6.0. U(VI) is spontaneously and mainly chemically adsorbed onto the oxygen-containing groups (i.e., hydroxyl and amidoxime) in PAO/GO/CS based on characterization and density functional theory (DFT). DFT analysis indicated that the optimized adsorption energy of most stable configuration of the uranyl-PAO/GO/CS is −309.99 kcal/mol. PAO/GO/CS can achieve selective adsorption for U(VI) against common coexisting ions and superior separation from water. These findings demonstrate the feasibility of PAO/GO/CS composite used for the remediation of uranium-containing wastewater.
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高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2021
·
IF 4.952
Yuntao Wang,Shasha Wang,Rui Li,Yu Wang,Qisen Xiang,Si Qiu,Wei Xu,Yanhong Bai
In recent years, emulsions stabilized by natural substances have attracted great interests of scientists. As both the emulsifying properties of chitosan (CH) and corn fiber gum (CFG) are poor, the different complex of CH and CFG were used to stabilize emulsion. It was found that the CH-CFG complex had significantly better emulsifying properties than CH or CFG at the same concentration, indicating they played a synergistic role in stabilizing oil in water emulsion. Cryo-SEM results showed that the CH-CFG complex formed a dense interfacial film on the surface of the oil droplets, forming a barrier that effectively prevented the flocculation of droplets, thus improving the stability of the emulsion. The changed surface zeta potential, interfacial activity and viscosity of CH-CFG complex compared with CH or CFG due to the interaction of CH and CFG contributed to the improved emulsifying properties of CH-CFG complex.
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高影响因子
KEY ENGINEERING MATERIALS
·
2020
·
IF 0
Ming Chun Li,Mei Hua Xin
In this study, a new type of surfactant, N, N-dialkyl-3, 6-O-sulfopropyl chitosan (SPDACS) was prepared with two kinds of chitosan (Mw 10 and 50 kDa) and three kinds of alkyl groups (octyl, decyl and lauryl) respectively. The substitution degree of alkyl chain was around 1.50, and the substitution degree of sulfopropyl was around 1.70. The relationship of structure and surfactivity of chitosan-based surfactants were studied with six different structures of SPDACS.The results showed that the length of alkyl side chain and the molecular weight of chitosan main chain of SPDACS had distinct effect on the surface tension (γ) and the critical micelle concentration (CMC). CMC and γ could be reduced as the length of alkyl and the molecular weight of chitosan increased. For the products with 50 kDa of chitosan, the CMC decreased from 0.014 to 0.006 mg/mL, and γ down to 23.59 from 28.76 mN/m as the length of alkyl increased from 8C to 12C. The similar patterns happened for the products with 10 kDa of chitosan. The mean size of the blank micelles decreased with the growth of the length of alkyl, and the molecular weight of chitosan had little effect on the particle size. The zeta potential of all micelles were above -35mV which meant the micelles had good stability in the solution.The product of 5-SPDLCS (50 kDa, lauryl) with the best surfactivity were selected for the study of PTX solubilization. The optimal ratio of 5-SPDLCS/PTX was determined to be 1/1.1. The results showed the encapsulation effificiency (EE) and loading effificiency (LE) were 92.2 % and 50.36 % respectively. The solubility of PTX in water reached to 6.08 mg/mL. The solubility of PTX was 60,000 times higher than that of PTX (< 0.0001mg/mL) in pure water.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 33
·14129-14135
·
IF 3.288
Shuping Wu,Kanghui Li,Zihang Zhang,Lingyun Chen
A promising electrochemical sensing platform based on imprinting chitosan (CS) nanocomposites integrating multi-walled carbon nanotubes (MWCNTs)/graphene (GR)/gold nanoparticles (AuNPs)/Nafion was developed for the sensitive and selective detection of Pb2+. The platform was constructed via drop coating and electrodeposition methods and characterized by using cyclic voltammetry, electrochemical impedance spectroscopy, and differential pulse voltammetry. Under the optimized conditions, the proposed sensor showed good sensitive determination of Pb2+ in the range of 1.0 × 10−9–5.0 × 10−5 mol L−1 with a detection limit of 2.83 × 10−10 mol L−1. In the presence of interfering metal ions, the fabricated sensor could selectively detect Pb2+. Meanwhile, the imprinted sensor exhibited high repeatability, good reproducibility and stability. The successful detection of Pb2+ in water and milk samples suggested its potential application for monitoring Pb2+ in complex water systems for environmental protection and food safety applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 29
·13962-13973
·
IF 4.682
Wang Yifan,Wan Yuqin,Meng Xiangqi,Jiang Lei,Wei Hao,Zhang Xinyue,Ma Ning
Solar energy, as an endless clean energy, has great prospects for the use of water vapor from sewage purification and seawater desalination. Local heating of surface water has shown to maximize the energy efficiency of steam generation. Therefore, at first, the material is required to have a good ability of photo-thermal conversion. Among the photo-thermal converting materials, MXenes are arising candidates for effective photo-thermal conversion, which have shown excellent photo-thermal conversion efficiency and have been attempted for photo-thermal distillation. Although a high photo-thermal conversion efficiency has been realized, however, it is more challenging to prepare photo-thermal evaporating materials with rapid water transport capacity and generating solar steam. In this work, a photo-thermal distillation device was reported by combining a chitosan aerogel with a bio-inspired wood-like oriented porous structure prepared by directional freezing method, and Ti 3 C 2 T x two-dimensional nanosheets coated with polyethyleneimine sprayed on the surface. The ordered microporous structure can quickly transport moisture from the bottom up to the evaporation surface by capillary force. The coating of Ti 3 C 2 T x coated with polyethyleneimine on the evaporation surface has a strong ability to capture sunlight. The evaporation rate reaches 3.99 kg m −2 h −1 under the optical power density of 3000 W m −2 and the efficiency reaches 90%, indicating the broad application prospects as a photo-thermal conversion material for efficiently producing clean fresh water. Graphical abstract
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高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 3
·1660-1669
·
IF 1.134
Deng Yu-Ying,Xiao Xin-Feng,Wang Dan,Han Bo,Gao Yu,Xue Jian-Liang
Cu-BTC was synthesised by hydrothermal method in this study to adsorb and remove the toxic heavy metal hexavalent chromium Cr(VI) in water. The EDTA-chitosan/Cu-BTC was prepared by the surface modification of Cu-BTC with EDTA-modified chitosan. The initial concentration effects of adsorbed
chromium solution, adsorbent dosage, adsorption time, adsorption temperature and pH of chromium solution on adsorption capacity were estimated using the single-factor optimisation experiment. Results show that the adsorption capacity of the modified composite was higher than that of Cu-BTC.
Cu-BTC and EDTA-chitosan/Cu-BTC exhibited significant adsorption of Cr(VI) under acidic conditions in water and basically independent of temperature. Their adsorption processes conformed with the pseudo-second-order model. The Langmuir adsorption isotherm model obtained the adsorption isotherm,
which indicated that the adsorption process was single molecule adsorption. Isotherm fitting obtained the maximum adsorption amounts of Cr(VI) for Cu-BTC and EDTA-chitosan/Cu-BTC at 27.32 and 46.51 mg·g-1, respectively. Factor and principal component analyses show that the
main factors affecting the adsorption of Cr(VI) in the EDTA-chitosan/Cu-BTC composites are pH, initial concentration and adsorption time. Therefore, EDTA-chitosan-modified Cu-BTC was a more feasible metal-organic framework material than Cu-BTC because of better adsorption performance, which
can be used for adsorption removal of Cr(VI) in water.
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PubMed
高影响因子
POLYMER SCIENCE SERIES A
·
2021
·Vol. 63
·期 6
·757-768
·
IF 1.206
Huang Qiao,Yu Haojie,Wang Li,Shen Di,Chen Xiang,Wang Nan
Abstract The glucose-responsive insulin release system was proved to be an effective way to deliver insulin. Here, dendritic mesoporous silica and phenylboronic acid were used to prepare a simple insulin delivery system, and its glucose-responsive properties were studied. Briefly, dendritic mesoporous silica was prepared by the biphase stratification approach. 3-Fluoro-4-carboxyphenylboronic acid was grafted on the hydroxypropyl chitosan to obtain phenylboronic acid-modified hydroxypropyl chitosan. In a weakly acidic environment, insulin was loaded on the dendritic mesoporous silica. The loading capacity and encapsulation efficiency could reach 32.1 and 94.6%, respectively. After that, modified hydroxypropyl chitosan was coated on the insulin-loaded dendritic mesoporous silica to obtain an insulin release system. Then sodium alginate was coated on insulin release system followed by calcium ion crosslinking to obtain another insulin release system. The results demonstrated that both systems had excellent performance in sustained insulin release. Glucose-responsive behavior was observed in the case of the former insulin release system.
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高影响因子
Agronomy-Basel
·
2020
·Vol. 10
·期 2
·265
·
IF 2.603
Cheng Zhang,Youhua Long,Jiaohong Li,Ming Li,Deke Xing,Huaming An,Xiaomao Wu,Yanyou Wu
Soft rot caused byBotryosphaeriadothideaandPhomopsissp. is a critical disease in kiwifruit. In order to efficiently control soft rot, a 28.6% chitosan composite film (CCF) containing chitosan, dextrin, ferulic acid, calcium, and auxiliaries was successfully developed. The results showed that CCF had a strong inhibitory effect on mycelia growth ofB. dothideaandPhomopsissp., with mycelial EC50values of 68.11 and 50.34 mg L−1, respectively. The concentration of 0.71–1.42 g L−1CCF had noticeably preventive and curative effects against soft rot. The spray of CCF before pathogen infection effectively reduced the incidence of soft rot, remarkably increased the content of resistance compounds, and activated the activity of defense enzymes. Moreover, it notably enhanced the yield and quality and prolonged the shelf life of kiwifruit. Therefore, the excellent control effects of CCF against soft rot might be associated with its film-forming property and antifungal activity, which prevent infection and induce plant defense mechanisms. The concentration of 0.71–1.42 g L−1CCF was optimal for the field application before the onset of disease symptoms in plants withB. dothideaandPhomopsissp.Keywords:chitosan composite film;kiwifruit;pathogen infection;soft rot;disease resistance;storage quality
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高影响因子
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