JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2016
·Vol. 309
·期 3
·1217-1226
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IF 0.983
Dong Zhi-min,Qiu Yan-fang,Dai Ying,Cao Xiao-hong,Wang Lin,Wang Pan-feng,Lai Zhong-jun,Zhang Wen-long,Zhang Zhi-bin,Liu Yun-hai,Le Zhang-gao
For the selective adsorption of U(VI) from aqueous solutions, the hydrothermal cross-linking chitosan (HCC) and its phosphorylation production (HCC-TPP) were synthesized by hydrothermal reaction. The monolayer maximum capacity of HCC-TPP was improved from 200 mg g −1 of HCC to 409.2 mg g −1 at 298 K. Calculated thermodynamic parameters showed endothermic property of the adsorption process, while kinetic parameters indicated that the interaction followed pseudo-second kinetic model. Selective separation of U(VI) from effluent by HCC-TPP was achieved.
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MATERIALS RESEARCH BULLETIN
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2018
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IF 2.873
Xin Chen,Xiu-Juan Xu,Xiu-Cheng Zheng,Xin-Xin Guan,Pu Liu
Chitosan supported palladium nanoparticles (Pd NPs/CS) catalysts were facilely prepared via an in-situ reduction of PdCl 2 method and characterized by various techniques. The results showed that the palladium particles were in the range of 4–8 nm and evenly dispersed on chitosan. Furthermore, the resulting Pd NPs/CS catalysts showed high catalytic activity for the hydrolytic dehydrogenation of ammonia borane (NH 3 BH 3 , AB) in aqueous solution. As for the catalytic reaction with an activation energy ( E a ) of 36.25 kJ mol −1 , the orders of palladium and AB concentrations were 0.81 and 0.45, respectively. The maximum turnover frequency was as high as 24.76 mol H 2 · mol Pd -1 · min -1 at 30 °C. In addition, the Pd NPs/CS catalysts still kept satisfied catalytic activity even after eleven runs.
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Desalination and Water Treatment
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2024
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IF 1
Pan Hu,Jing Wang,Ruihua Huang
In this study, batch adsorption study was utilized in evaluating the potential suitability of quaternized chitosan immobilized bentonite (BT) as an adsorbent in the adsorption of anionic pollutants, Cr(VI), and methyl orange (MO) from aqueous solutions. The adsorptive behaviors of Cr(VI) and MO were examined as a function of the ratio of quaternized chitosan to BT, adsorbent dosage, solution pH, initial Cr(VI) (or MO) concentration, and contact time. The adsorption equilibrium for both Cr(VI) and MO was reached quickly. Adsorption isotherms for Cr(VI) and MO were well described by the Langmuir isotherm, while the pseudo-second-order kinetic model provided good kinetic data fitting. Furthermore, the results show that this adsorbent exhibited higher adsorption capacity for MO than Cr(VI). It appears that this anionic Cr(VI) favored the electrostatic interactions with this adsorbent while the anionic MO dye may interact with this adsorbent by electrostatic interactions and the hydrogen bonding.
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Desalination and Water Treatment
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2024
·
IF 1
Lei Hu,Chao Yang,Limin Zang,Qifan Liu,Jianhui Qiu,Jun Yang,Xuan Qiao,Xue Yang,Huihao Li
The removal of dyes from wastewater by wastes has already attracted a great deal of attention for being in line with the idea of “treating the wastes with wastes”. In this study, the waste chitosan magnetic beads immobilized cellulase (CMP-IC) was applied in the adsorption of Orange G (OG) anionic dyes, so as to investigate the kinetics, isotherm and thermodynamics of the adsorption process. Providing porous structures and specific surface areas for OG molecules, CMP-IC possessed a higher adsorption rate at pH = 4 and suited with pseudo-second-order kinetic belong to rate-limiting step. Meanwhile, the adsorption was a spontaneous procedure that met the Langmuir isotherm described as monolayer adsorption. CMP-IC was selective in adsorbing OG anionic dye from the mixed dyes solutions and was efficient in reabsorbing OG for 5 cycles due to the excellent chemical and structural stabilities. Our study can provide new insights into utilizing waste materials for water treatment for various promising applications.
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Journal of Water Process Engineering
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2026
·
IF 6.6
Jiajia Huang,Mushi Li,Mingyu Ma,Juan Wu,Wenjing Sang,Shihong Xu,Dengxin Li
Two chitosan/pectin graft copolymers were synthesized via one-step grafting. • CPDA bears cyclic quaternary ammonium groups; CPDM has comb-like chains. • Both achieved 87%–96% removal of four anionic dyes. • CPDM excels under neutral to alkaline conditions. • Charge neutralization, charge patching, hydrogen bonding, and bridging work together. To achieve cost-effective decolorization, two structurally tunable flocculants—CPDA, bearing a cyclic quaternary ammonium structure, and CPDM, possessing a comb-like quaternary ammonium architecture—were synthesized via a one-step grafting strategy. The effects of raw material mass ratio (CS: pectin: monomer), temperature, reaction time, and initiator dosage on the synthesis were systematically evaluated. The optimal mass ratios were determined to be 1: 1: 3 for CPDA and 1: 1: 1 for CPDM, with the remaining conditions held identical (temperature, 50 °C; reaction time, 3 h; APS dosage, 200 mg). To assess the effectiveness and applicability of CPDA and CPDM, the influences of flocculant dosage, initial pH, initial dye concentration, and coexisting inorganic ions on decolorization performance were investigated. Removal efficiencies of 87%–96% were achieved by both flocculants for the four anionic dyes examined, with CPDA exhibiting superior performance under acidic to neutral conditions and CPDM proving more effective under alkaline conditions. Mechanistic analysis indicated that electrostatic neutralization, charge patching, adsorption bridging, and network capture acted synergistically in the flocculation process. This study offers new insights into the controllable synthesis of chitosan-based flocculants and the understanding of their structure–activity relationships. Download: Download high-res image (173KB) Download: Download full-size image
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Journal of Food Measurement and Characterization
·
2025
·
IF 3.3
Yang Tingting,Tao Guanhua,Xu Xinye,Yu Chunyu,Shi Jindou,Ma Qingwen
Phytosterol (PS) face challenges of poor stability and rapid release in the gastrointestinal tract. To overcome these limitations, this study developed whey protein-chitosan composite (WP-CS-PS) nanoparticles via reverse solvent precipitation, significantly enhancing PS transport efficiency and functional performance. Through systematic optimization using single-factor and orthogonal tests, the nanoparticles were fabricated under ideal parameters. The optimal conditions included a 1:1 WP/CS mass ratio, 0.8% (w/v) PS concentration, 60 °C hydration, and 15 min stirring, which yielded high encapsulation efficiency (77.43%), uniform particle size (203.41 nm, PDI 0.265), and excellent colloidal stability (zeta potential − 35.42 mV). Structural analyses (SEM, FT-IR) revealed a dense gel-network morphology with PS successfully embedded via hydrogen bonding and electrostatic interactions. The WP-CS matrix markedly improved PS stability against thermal, UV, and storage stresses, while in vitro digestion assays demonstrated sustained intestinal release (17.72% slower than free PS). These results not only validate WP-CS-PS as a robust carrier for lipophilic bioactives but also offer a scalable strategy to enhance the bioavailability of PS in functional foods, potentially addressing global health needs such as cholesterol management and dietary supplementation. By bridging material science and nutritional delivery, this work paves the way for sustainable nutraceutical innovations with broad industrial applicability. Graphical
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FOOD HYDROCOLLOIDS
·
2025
·
IF 12.4
Yantao Liu,Xuxi Ma,Chen Huang,Yujia Wan,Qiuyu Deng,Siqi Chen,Jun Tian,Fusheng Sun,Zhengqi Wu,Duoxia Xu,Nan Yang
The interfacial behaviors of microgels at the oil-water interface were significantly affected by the properties of the oil phase, which in turn influence their emulsification ability. In this study, the effects of oil polarity on the interfacial behaviors of hydrophobic modified chitosan microgels ( h -CSMs) at five typical oil-water interfaces (decane, 1-chlorodecane, decanol, medium-chain triglycerides (MCT), and paraffin) were investigated. The interfacial adsorption results show that h -CSMs can rapidly adsorb onto the selected oil-water interfaces, with the ability to reduce surface tension ( γ ) increased as the polarity of the oil phase increased. The saturation adsorption interfacial pressure ( π ) has a power law index (α) equal to 1.19 with the initial oil-water interfacial tension ( γ ow ) indicating that the h -CSMs are soft particles with interfacial deformability between surfactants and flexible proteins. The h -CSMs formed strong viscoelastic interfacial layers at all of the oil-water interfaces except decanol with the dilatational modulus ( E ) positively correlated to the thickness and amount of adsorbed microgels at the interface. From the interfacial microstructure analysis, weakly polar oils (such as paraffin, n-decane) contributes to the expansion of h -CSMs particles, thereby forming a thicker adsorption layer. The polar oil phase suppresses the excessive expansion of h -CSMs, resulting in a compact and thinnest adsorption layer (such as decanol). Emulsion stability studies showed that the polarity and viscosity of the oil phase, and the interfacial properties of the h -CSM film affect the stability of the emulsions, but the interfacial viscoelasticity dominated. Paraffin emulsions (particularly the high internal phase emulsions, HIPEs) stabilized by h -CSMs exhibit superior storage, mechanical, thermal, and ion stability, but the addition of excessive salt ions will introduce emulsion instability by changing the charge properties and thus the morphology and interaction of the microgels at the interface.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Sijia Luo,Shenghe Zhang,Zhimin Song,Lei Song,Fukai Chu,Bibo Wang,Yuan Hu
Thermoplastic polyurethane (TPU) faces significant fire safety challenges due to its inherent flammability and toxic smoke emissions. To address this issue, a novel bio-based flame retardant, APP@CS-Ce, was developed via electrostatic self-assembly of chitosan (CS) and cerium ions (Ce 3+ ) onto ammonium polyphosphate (APP). This core-shell structure used chitosan derived from biomass as the carbon source and synergistically utilized the catalytic carbonization and free radical quenching functions of the rare earth element cerium (Ce 3+ ). Incorporating only 15 wt% APP@CS-Ce enabled TPU composites to achieve a UL-94 V-0 rating and a high limiting oxygen index (LOI) of 27.6 %. The char residues surged from 0.5 wt% (pure TPU) to 24 wt%, while peak heat release rate (PHRR) and total smoke production (TSP) decreased by 76 % and 61 %, correspondingly. Critically, CO emissions were reduced by 45 %, confirming effective toxicity suppression. The cerium ions further promoted graphitization of the char layer and catalyzed CO-to-CO 2 conversion, enhancing barrier properties and combustion efficiency. Unlike conventional additives, APP@CS-Ce preserved mechanical integrity, with elongation at break decreasing merely 0.5 % due to improved interfacial compatibility. This work demonstrates a sustainable, high-performance flame-retardant strategy combining biomass resources with rare-earth catalysis for next-generation TPU applications.
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PubMed
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Siqi Liu,Jiawei Wang,Jiangwei Ren,Meng Zhang,Hui Mao
The contamination of fluoride is a concerned issue from the perspective of drinking water safety. Herein, we reported the controlled synthesis of novel chitosan aerogel functionalized by tannin-chelated Zr(IV), which was capable of accomplishing the high-performance adsorption of fluoride from water. The as-prepared functional chitosan aerogel (BTCA-Zr) featured fast adsorption kinetics and exceptional adsorption capability to fluoride. In static adsorption experiments, the superiority of the functional chitosan aerogels was demonstrated with the removal efficiency higher than 95% in the wide pH range of 3–10. The high porosity (79.08%) combined with surface decoration of amphiphilic tannin provided the functional aerogel with fast adsorption equilibrium in 40 min. Adsorption capacity of 86.0 mg g −1 for fluoride was achieved by the functional aerogel with the low fluoride concentration of 2.0 mg L −1 . The fluoride adsorption on BTCA-Zr exhibits pseudo-second-order (PSO) kinetics and fits the Langmuir isotherm, and the adsorption process is exothermic and spontaneous. The adsorption mechanism was revealed by adsorption experiments combined with the density functional theory (DFT) calculations, which confirmed the critical role to form the species of Zr-oxyfluoride with low binding energy for accomplishing the high-performance adsorption of fluoride. Notably, the functional aerogel achieved 85.59% of fluoride removal by column adsorption of the simulated underground water. The functional aerogel was recycled 5 times in column adsorption of the simulated underground water by retaining 78.38% of its initial adsorption capacity.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2026
·
IF 8.7
Xiaolu Li,Si Wu,Tao Feng,Tong Wu,Xu Zhu
Gold nanoparticles (AuNPs) exhibit excellent catalytic activity but face significant practical constraints, such as insufficient stability and difficult recovery. This study employed a quercetin-mediated green reduction method with chitosan as a stabilizer to synthesize Chitosan/AuNPs (Chit/AuNPs) capable of maintaining long-term dispersion stability (960 h). It was clearly demonstrated that the chitosan dosage is critical for controlling the size of AuNPs, with 0.8 mL of chitosan yielding smaller AuNPs with an average particle size of about 16.8 nm. Subsequently, Chit/AuNPs were immobilized within a calcium alginate network via electrostatic attraction and Ca 2+ cross-linking, successfully fabricating reusable Chitosan/AuNPs@Calcium Alginate (Chit/AuNPs@CaA) composite microspheres. The catalyst exhibited high activity at room temperature, achieving a 4-NP conversion rate of 97.0% within 25 min with an apparent rate constant (k) of 0.168 min −1 . Notably, after five consecutive uses, the conversion rate remained at 96.9% within 25 min, confirming its reliability as a reusable catalyst. Furthermore, in real water samples, the catalyst maintained over 96.1% conversion rate, demonstrating strong environmental tolerance. This research contributes to the development of novel catalytic materials with high activity, remarkable stability, and practical application potential.
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Journal of Food Measurement and Characterization
·
2026
·
IF 3.6
Yang Fang,Lei Sichao,Ma Renyi,Zhang Wen,Luo Minhui,Xie Chenyang
To develop a novel intelligent packaging material capable of real-time food freshness monitoring and preservation, this study prepared a pH-responsive bioactive film (KCNB) by incorporating blueberry anthocyanins (BA) and nano‑zinc oxide (NanoZnO) into a konjac glucomannan/chitosan (KGM/CS) matrix. The resulting KCNB film was structurally characterized and functionally evaluated and results confirmed the successful dispersion of NanoZnO and BA within the matrix. The film exhibited excellent UV‑blocking capacity, significantly enhanced antioxidant activity (DPPH radical scavenging rate increased to 77.57%), and effective antibacterial efficacy against E. coli and S. aureus , which collectively help prevent light‑induced deterioration, chemical oxidation, and microbial spoilage. Crucially, the film displayed a reversible color transition from red to green across the pH range of 2–12, providing a basis for its function as a visual freshness indicator. When applied to chicken breast preservation, the KCNB film, through the synergistic action of these multiple functions, effectively slowed down spoilage, maintained a lower total volatile basic nitrogen (TVB‑N) level, and thereby extended the shelf life by approximately 4 days compared with the control group. This study demonstrates that the developed multifunctional film holds high potential for application in intelligent bioactive packaging of meat products.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2026
·
IF 8.7
Jin Zhang,Jianfeng Li,Dingguo Zhao,Mingjun Chen,Zhaohui Zheng,Ting Wang,Wenli An,Zhicheng Fu,Guoxing Sun,Jinni Deng
Traditional chitosan (CS)-based aerogels suffer from inherent flammability and hygroscopicity, leading to structural collapse and property degradation upon water exposure, which severely limits their practical application. To address these challenges, a kind of copolymer emulsion (CPE) integrated with flame-retardant phosphorus groups and hydrophobic fluorinated groups was developed, and was applied directly to the preparation of CS-based aerogels through simply one-step method. Based on low-surface-energy properties of fluorinated groups aggregated to the surface and physical interaction force of both hydrogen bond and electrostatic interaction between CS and CPE, CS/CPE 0.20 with 20 wt% of copolymer content (F content is lower than 5%) demonstrates great flame retardancy (V-0, LOI = 37.5%), superior hydrophobicity (WCA = 134.1°) and enhanced mechanical properties (compressive strength increased by 200% in radical direction). Significantly, by synergistic effect of hydrophobic protection and structure stability, the dimensional and performance stability of CS/CPE 0.20 on structure, flame retardancy and hydrophobicity still exhibit excellently even after 48 h at 75% relative humidity. Meanwhile, CS/CPE 0.20 also has well oil-water separation performance, solvent adsorption, wet stability and antifouling properties. Consequently, by this simple blending in preparation process, CS-based aerogel composite could achieve multi-functions especially durable flame retardancy and prominent water resistance, which would be effectively used in many practical applications. Compared to traditional functional-modification methods by multi-steps that may be not that stable and uniform, this integrated CPE by one-step strategy not only displays more stable multi-functions but also ensures durable flame retardancy and water resistance through strong interfacial interactions.
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