JOURNAL OF POLYMER RESEARCH
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2026
·Vol. 33
·期 3
·76
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IF 3.5
Song Xiaobo,Liu Xinyi,Mu Zongjing,Xu Zhongbin,Zhang Cailiang
The growing demand for advanced medical catheters in minimally invasive surgery underscores the importance of optimizing catheter mechanical properties. Although existing studies have explored various multilayer catheters made from different materials and composite designs, research on poly ether ether ketone (PEEK)-based double-layer catheters remains limited. This work developed a PAKD/PEBA double-layer medical catheter utilizing a combination of plasma surface modification and multi-step grafting. The approach enhanced the interlayer peel strength from 0 N to 6.78 N, meeting the bonding requirements for medical catheters. Moreover, compared to a single-layer PEEK catheter with the same dimensions, the bending stiffness of the PAKD/PEBA double-layer catheter was reduced by 39.65% and the torsional stiffness by 34.14%, resulting in improved flexibility and torsional resistance.
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Journal of Sustainable Metallurgy
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2026
·
IF 3.5
Zhu Shan,Hu Jiugang
Clay-type lithium ore is an important natural lithium resource characterized by its wide distribution and large reserves. Owing to its complex composition, low-grade clay-type lithium ore contains high levels of impurities and exhibits low lithium concentrations in its leachate, necessitating the selective separation and enrichment of lithium from impurities. In this study, a synergistic solvent extraction system with Mextral®3939H and DIBK was applied for the selective extraction and separation of lithium from the leachate of low-grade clay-type lithium ore, with the objective of mitigating the imbalance between lithium supply and demand. The effects of Mextral®3939H molar fraction, equilibrium time, extraction temperature, organic-to-aqueous phase ratio (O/A), and initial aqueous pH on extraction and separation performance were systematically investigated. The optimized extraction conditions were identified as a Mextral®3939H molar fraction of 0.6, equilibrium time of 20 min, extraction temperature of 45 °C, O/A of 2:1, and initial aqueous pH of 7. Under these optimal conditions, the extraction efficiency of lithium reached 93.76%, while the separation coefficients between lithium and aluminum, calcium, iron, potassium, and sodium were 18.96, 797.64, 394.55, 68.38, and 313.19, respectively. The extraction equilibrium isotherm of lithium revealed that three counter-current extraction stages were required at O/A = 2:1 to reduce the lithium concentration in the raffinate to below 0.042 mg/L, achieving an overall extraction efficiency of more than 99%. Furthermore, slope analysis suggested that the extracted lithium complex may be {Li 2 ⋅[A] (o) ⋅[Cl − ] [B] (o) ⋅[HA]}. This work will provide a theoretical basis for the potential application of industrial lithium recovery from clay-type ores. Graphical
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RESEARCH ON CHEMICAL INTERMEDIATES
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2026
·
IF 3.3
Qie Junmao,Cao Mengfei,Zong Jiaqi,Chang Jian,Zhang Shuqi,Xu Tong
Selective catalytic reduction (SCR) is presently the predominant technology for controlling nitrogen oxides (NO x ) emissions from industrial flue gas in China. Central to its operation is the denitration catalyst; however, the conventional systems face constraints such as a limited active temperature range, potential toxicity of certain active components, and high production costs. Bayan Obo rare earth tailings, enriched in catalytically active elements including Fe, Ce, and Nb, present a promising alternative raw material for denitration catalyst development. Currently, catalyst modification to improve denitration performance is a key research focus. In this study, Fe-rich magnetic separation rare earth tailings were obtained via magnetic separation processing of Bayan Obo tailings. We systematically evaluated the denitration performance and mechanism of catalysts prepared from these magnetic separation rare earth tailings through Mn modification in combination with NaOH alkaline fusion activation. Results indicate that when the catalyst is produced under conditions of 3 wt.% Mn loading and an ore-to-alkali ratio of 1:1.5, activated at 200 °C, the denitration efficiency reaches 89.6%. Furthermore, as the reaction temperature increases, the catalyst consistently exhibits high N 2 selectivity, maintaining values above 90% within the 100–300 °C range. The Mn-modified, NaOH alkaline fusion-activated catalyst shows enhanced stable adsorption of ammonia species, suppression of intermediate conversion to N 2 O, and improved N 2 selectivity. This work offers a viable approach for the high-value, sustainable utilization of rare earth tailings in environmentally friendly denitration technologies.
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BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
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2026
·
IF 1.7
Wei Ran,Liu Shanjun,Sun Shan,Sun Jiaxu,Zhang Jianlin
Persulfate activation for the degradation of organic pollutants has been extensively studied. However, most studies focus narrowly on the performance of activators, with limited investigation of continuous-flow systems. Further experimental validation in such configurations is essential to promote practical applications. A continuous flow experiment for the degradation of atrazine was carried out by persulfate activation using municipal sludge as catalyst. The effects of key operating parameters such as the concentration of activator, hydraulic retention time, mixing intensity and the dosage of persulfate on degradation efficacy were systematically evaluated. Under optimized conditions of 300 mg L⁻¹ sludge biochar, 8 h hydraulic retention time, 300 rpm mixing intensity, and 168:1 persulfate/atrazine molar ratio, the continuous-flow system achieved stable atrazine degradation (> 80%) for 30 days. This study would provide crucial technical validation to advance practical implementation of persulfate-based advanced oxidation processes.
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PLANT MOLECULAR BIOLOGY
·
2026
·Vol. 116
·期 2
·35
·
IF 3.7
Ren Fangfang,Shen Hui,Chen Weiye,Sha Siyue,Li Shanshan,Tao Xin,Li Zhuorui,Shen Weishou,Gao Nan
There is increasing interest in novel fertilizers to reduce dependency on chemical fertilizers in agriculture. Esters are promising stimulants. γ-Valerolactone, a volatile organic compound produced by Stutzerimonas stutzeri NRCB010, was suggested to promote tomato seedling growth under sterile conditions. We thus examined the effects of varying concentrations of γ-valerolactone on growth in hydroponic and greenhouse conditions, checked associated transcriptional changes, and measured the hormone contents. In this study, γ-valerolactone treatment significantly promote the tomato seedling growth, and the optimum concentration was 100 mg L − 1 and 250 mg L − 1 in hydroponic and greenhouse conditions, respectively. The content of IAA-aspartate, IAA-glutamate, indole-3-acetamide, indole-3-acetonitrile, indole-3-butyric acid, gibberellic acid 3 were all significantly increased in leaves, stem, and roots. Transcriptomic analysis revealed that when treated with γ-valerolactone for 6 h, there are more upregulated differentially expressed genes (DEGs) than downregulated DEGs, however, it’s opposite when treated with γ-valerolactone for 24 h. γ-Valerolactone may stimulate the growth of tomato seedlings through mechanisms such as photosynthesis, phytohormone signaling, and the biosynthesis of secondary metabolites. Our studies provide a theoretical basis for the application of γ -valerolactone as a new type of plant growth regulator and lay the foundation for the development of efficient and environmentally friendly agricultural biostimulants.
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WATER AIR AND SOIL POLLUTION
·
2026
·Vol. 237
·期 10
·615
·
IF 3.5
Tian Jianghao,Xiao Min,Li Shifeng,Bu Ruiying,Yang Xin,Zhang Hongling,Chen Xiaoyang
To overcome membrane permeation selectivity defects and mitigate membrane fouling, a novel nanocomposite, UiO-66-NH 2 /g-C 3 N 5 (UNCN), was designed and synthesized. Notably, this composite overcomes the inherent limitations of UiO-66-NH 2 (limited visible light absorption) and g-C 3 N 5 (low specific surface area). The optimal composite ratio was determined to be 3:7 through systematic optimization. The UNCN-3:7 nanocomposite was then embedded into the polyamide selective layer on polysulfone via in situ interfacial polymerization under optimal conditions, resulting in a thin film nanocomposite (TFN) Nanofiltration membrane. Characterization revealed that the UNCN-3:7 Nanocomposites were uniformly distributed within the polyamide (PA) matrix. The resulting TFN Nanofiltration membrane possessed an ultrathin, positively charged selective layer with enhanced hydrophilicity, evidenced by a reduction in water contact angle from 60.3° to 47.3°. It exhibited a 43% increase in pure water permeability compared to the unmodified thin film composite (TFC) membrane (52.7 vs. 36.9 L·m −2 ·h −1 ·bar −1 ), while maintaining an excellent Na 2 SO 4 retention rate (> 96%). Furthermore, the membrane demonstrated excellent photocatalytic degradation performance, superior anti-fouling properties (flux recovery rate > 92%), and stable long-term operation. These results indicate that the construction of the novel UNCN nanocomposite Nanofiltration membrane presents an effective strategy to address membrane fouling issues.
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 3
·196
·
IF 5.4
Yue Xiaoyue,Hao Chenxu,Ji Jinhua,Zhang Hui,Peng Yuewen,Bai Yanhong
A dual-mode sensor integrating colorimetric and fluorescent functionalities was constructed to enable sensitive, on-site visual detection of nitrite in food matrices, with CoFeMn hydroxide nanoflowers (CoFeMn HNFs) serving as a novel oxidase-mimicking nanozyme. First, the successful synthesis of CoFeMn HNFs was confirmed through a series of characterization techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). Then, the synthesized CoFeMn HNFs, which exhibit remarkable oxidase-like activity, effectively catalyzed the oxidation of 3,3’,5,5’-tetramethylbenzidine (TMB) to its blue oxidized form (ox-TMB) via the generation of superoxide anion radicals (O 2 • ⁻). Its K m and V max values reached 0.399 mM and 2.8 × 10 −7 M·s −1 , respectively, demonstrating not only significantly higher catalytic activity than horseradish peroxidase (HRP) but also efficient catalysis without the requirement of H 2 O 2 . In the presence of nitrite, ox-TMB undergoes a diazotization reaction to form yellow diazo products, accompanied by a distinct fluorescence quenching effect. In the colorimetric mode, the sensor exhibited an excellent linear response to nitrite over the concentration range 0.2 to 40 µg/mL, accompanied by a limit of detection (LOD) as low as 0.063 µg/mL. For the fluorescence mode, a superior linear range of 0.3 to 40 µg/mL was achieved, with a LOD of 0.223 µg/mL nitrite. The results generated by this dual-mode sensor for real food samples were highly consistent with the reference values from the national standard method, thereby confirming its accuracy and practical utility. This work presents a versatile, reliable, and cost-effective nanozyme-based platform that addresses a critical need for sensitive, rapid, and on-site nitrite monitoring in food products, with broad implications for improving food safety surveillance and protecting public health.
Section
Graphical
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Nature Communications
·
2026
·
IF 18.1
Qiao Kun,Feng Xuyang,Dong Linyu,Liu Limei,Ma Qing,Zhao Dechun,Lu Shang,Wang Haoyang,Yu Cunjiang,Pan Lijia,Wang Binghao
Vision-based robotic triaxial tactile sensing provides superior spatial resolution and rich multimodal data. However, employing rigid CMOS imagers suffers from limitations in mechanical flexibility and large-area scalability. Here we present a large-area ultraflexible photoelectrical impedance tomography (PIT)-based imager that achieves high-fidelity triaxial tactile sensing. The 5-μm-thick PIT imager incorporates a quantum dots/metal-oxide heterojunction layer with 16 peripheral electrodes, significantly reducing interconnects complexity (pixel-to-interconnect ratio >80). The device exhibits a photo-to-dark-current ratio exceeding 10⁴ under ultraviolet illumination, resolves spatiotemporal features as fine as 1.5 mm, and can simultaneously image up to five occluded regions. By integrating a thin light-scattering porous rubber and flexible LEDs, triaxial force decoding is achieved through Gaussian photocurrent analysis. The system achieves over a dynamic range of 80 kPa with a normal force sensitivity of 0.04 kPa⁻¹, a shear displacement resolution of 0.17 μm kPa⁻¹, and a topological recognition accuracy of 96.5%. We anticipate that this technology will enable advanced applications in industrial and humanoid robotics, medical and rehabilitation robotics, and wearable health monitoring and human–machine interaction systems.
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BIOLOGICAL TRACE ELEMENT RESEARCH
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2026
·
IF 4.3
Yang Wenyan,Ma Lu,Hu Ting,Zhang Lei,Wu Kewei,Chen Hualin,Zhang Dandan,Luo Peng
Geochemical fluoride pollution is a global public health issue affecting a wide range and large population. The major health hazard from long-term fluoride exposure is skeletal fluorosis, a highly disabling and irreversible bone damage disease with no effective early interventions available to date. Given reactive oxygen species (ROS) accumulation is a key event in fluoride-induced bone damage, we established a sodium fluoride-exposed rat model. During the phase when fluoride induced ROS accumulation and mild bone damage in rat bone tissue, we administered Rosa roxburghii Tratt juice (RRTJ)—a natural food-medicinal homologous plant with antioxidant properties—to explore its intervention effect and potential mechanism against fluoride-induced bone damage. Results showed RRTJ inhibited fluoride-induced decreases in bone mineral density and trabecular number in male rats. Since enhanced bone resorption mediated by osteoclast overactivation is the initiating link of these fluoride-induced pathological changes, this study further found RRTJ suppressed fluoride-induced increases in osteoclast activity in male rat bone tissue, specifically reducing osteoclast numbers in bone tissue and lowering serum levels of bone resorption markers CTX and TRAP-5b. This effect is achieved by RRTJ scavenging fluoride-induced ROS accumulation in bone tissue, restoring ROS/TNF-α/NF-κB pathway homeostasis, and thereby inhibiting the overexpression of osteoclast activation-related genes tartrate-resistant acid phosphatase and cathepsin K. In conclusion, this study confirms RRT inhibits fluoride exposure-induced bone damage in male rats by regulating ROS/TNF-α/NF-κB pathway homeostasis. These findings provide new perspectives on the mechanism of fluoride-induced bone damage and, more importantly, reveal a potential novel intervention strategy.
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CELLULOSE
·
2026
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IF 4.6
Zhu Hong,Cheng Jun-Hu,Yi Cuiping
This study investigated the structural and performance characteristics of cellulose nanofibers (CNFs) prepared through Fe 2+ assisted cold plasma (CP) pretreatment of cellulose. The results indicated that the high-energy active particles generated by Fe 2+ assisted CP played a crucial role in the deconstruction of cellulose, resulting in CNFs with a more uniformly dispersed network structure, increased carboxyl content, and enhanced intramolecular hydrogen bonding. This effect was particularly pronounced at a working voltage of 60 kV. In addition, the mechanical properties of CNF films exhibited significant improvements in tensile strength and elongation at break. At a working voltage of 60 kV, the tensile strength and elongation at break of the CNF film increased by 21.79% and 78.91%, respectively, compared to that obtained without pretreatment. Compared to enzymatic pretreatment methods, the Fe 2+ assisted CP pretreatment offered distinct advantages in both time efficiency and mechanical performance enhancement of CNF film. Considering the overall structure and properties of the CNFs, a working voltage of 60 kV was determined to be optimal for Fe 2+ assisted CP pretreatment, yielding superior CNF performance.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2026
·
IF 1.7
Yao Benlin,Ren Guangzhi,Jia Hongwei,Yang Mingshuai,Li Xun,Liu Xiao,Sun Jing,Liu Sijing,Xiao Yiqun,Meng Zhaokai,Song Peng,Chen Hui,Zhang Qiuyue,Zhang Lei,Lin Rushan,Ye Guoan,He Hui
This study investigated the electrolytic reduction of kilogram-scale U₃O₈ pellets in molten LiCl and focused on optimizing the process for nuclear fuel cycle applications. Critical developments included resolving carbon impurity issues in LiCl, implementing a sequential kerosene-cyclohexane washing process at 150 °C for lithium anode pretreatment, and establishing optimal pellet fabrication parameters. By adjusting the sintering atmosphere, the pellet density (4.5–8.5 g/cm 3 ) and chemical composition (U₃O₈ or U₄O₉) could be controlled. The electrolytic reduction used a stainless-steel cathode basket loaded with sintered pellets and a lithium metal counter electrode. The experiment was conducted in an inert-atmosphere glove box for 181h. The results showed reduction extents of 99.09% for U₃O₈ and 99.17% for U₄O₉, a uranium metal production rate of 55.7 gU/h, and a current efficiency of 56.1%. X-ray diffraction analysis confirmed that the primary reduction products were metallic uranium and uranium carbide.
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 7
·501
·
IF 5.4
Wang Yunan,Zhang Qiang,Cheng Yue,Shi Chenglong,Wang Yong,Ma Xiaofei
A micro-nano structure enhanced chiral separation strategy is proposed by integrating biomimetic liposome assemblies with cyclodextrin (CD) derivatives as composite chiral selectors in capillary electrophoresis (CE). The self-assembly of weakly chiral, poorly soluble phospholipids into liposomes markedly amplifies chiral discrimination when coupled with CD-based molecular recognition, enabling highly efficient separation of multiple 9-fluorenylmethoxycarbonyl (Fmoc)-amino acid enantiomers. This enhancement is proposed to be associated with the formation of interfacial pre-enrichment microzones on liposome surfaces, where locally concentrated selectors and analytes may engage in synergistic hydrogen bonding, hydrophobic interactions, and steric effects, collectively strengthening chiral recognition. The composite system exhibits good selectivity and compatibility in mixed-sample separations, supporting simultaneous enantioseparation of multiple amino acids with high reproducibility. Beyond establishing an effective CE-based approach for amino acid enantiomer separation, this work demonstrates a proof-of-concept for transforming poorly soluble, weakly chiral substances into efficient chiral selectors through micro-nano assembly, offering preliminary insights for synergistic chiral separation systems. Graphical abstract
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