KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2023
·Vol. 40
·期 4
·999-1013
·
IF 2.7
Gao Yan,Li Jinfeng
According to the requirements of flame retardant and environmental protection of wool fabrics, a phosphorus-nitrogen intumescent flame-retardant (IFR) system was constructed on the surface of wool fabrics based on dip-rolling-drying process with DEA serving as carbonizing agent, phosphorous acid and phosphoric acid used as acids, and urea serving as blowing agent. Ammonium N-ethoxy-n-methylene phosphonate-n-ethyl phosphate (ANPP) was designed and the treated wool fabrics with a weight gain (WG) of 27.4% presented highly flame retardancy and exhibited a high limiting oxygen index (LOI) of 37.8%; after 50 laundering cycles (LCs), LOI can still be remained at 30.5%. Self-extinguishing properties in the vertical combustion. The cone calorimeter (CONE) test verified that the peak heat release rate (PHRR) of the untreated wool fabrics declined to 82.2 from 251.7 kW/m 2 after ANPP treatment, and the total heat release (THR) was reduced to 4.4 from 37.9 MJ/m 2 . In addition, the physical properties were maintained in the usable range. The flame-retardant mechanism analysis showed that the dense phosphorus-nitrogen char layer shaped effectively prevented the release of heat and spread of flammable volatile substances in the condensed phase. This study supplies novel ideas on devising and manufacturing of environmentally friendly treated wool fabrics with superior flame retardancy, durability, and high efficiency.
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高影响因子
Nano Research
·
2023
·Vol. 16
·期 7
·9997-10003
·
IF 9.9
Yu Zhumin,Zhao Kai,Li Lin,Ye Changqing,Dong Yuxiang,Song Yanlin
Localized surface plasmon resonance (LSPR) has been widely used in medical detection because of its time effectiveness, non-invasiveness, high sensitivity, and relatively simple fabrication process. Porous anodic alumina (PAA) can be regarded as a plasma substrate for label-free detection due to its unique two-dimensional structure. In this work, a vivid Au-PAA composite film with the inverted taper structure was developed by multi-step anodic oxidation and pore-widening processes followed by magnetron sputtering with Au nanoparticles (AuNPs). The highly saturated and bright structural color was generated by the synergistic effect of photonic and plasmonic modes. Interestingly, various Au-PAA composite films with structural colors altering from purple to red were obtained via adjusting the height/diameter ratio of PAA. Benefiting from the inverted taper structure, light trap characteristics were effectively enhanced by increasing the incident light and reducing the diffuse light. In addition, a finite difference time domain (FDTD) model was proposed to predict the relationship between the reflectance peak and the height of the composite film, and the simulated data were in good agreement with the experimental results. As a proof of concept, label-free detections of various reagents (water, ethanol, glycol, glycerol, and glucose), the concentration of glucose (refractive index sensitivity of 376 nm/RIU, RIU: refractive index unit), and thrombin (detection limit of 0.1 × 10 −7 mol/L) were realized by the Au-PAA composite film. This vivid Au-PAA composite film provides a very powerful tool for in-situ label-free bio-detection.
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ANALYTICAL SCIENCES
·
2023
·Vol. 39
·期 7
·1151-1161
·
IF 1.6
Zhang Zhihui,Zhang Jingyu,Li Mufei,Jin Xiangzi,Yao Liping,Wang Wenyuan,Liu Jinsong,Li Zuguang
This work first proposed a novel green and efficient method based on Quick, Easy, Cheap, Efficient, Rugged, and Safe pretreatment (QuEChERS) combined with switchable hydrophilic solvent homogeneous liquid–liquid microextraction (SHS-HLLME) for trace determination of triazole fungicides (TFs) in agricultural products such as vegetables and fruits by gas chromatography–mass spectrometry (GC–MS). N , N -Dimethyl benzylamine was used for the synthesis of SHS. Box–Behnken design was applied for the optimization of extraction conditions and a mathematical model was obtained. Ultimately, 0.50 mL SHS, 1.0 mL 10 mol L −1 sodium hydroxide, and 45 s ultrasonic time were determined as optimal conditions for the SHS-HLLME method. The limit of detection and limit of quantification determined using the optimal method (SHS-HLLME/GC–MS) were 0.13–0.27 ng mL −1 and 0.43–0.90 ng mL −1 , respectively. In addition, the SHS-HLLME method under optimal conditions was combined with the traditional QuEChERS method to realize the advancement of the SHS-HLLME method from simple to complex matrix analysis, and the QuEChERS–SHS-HLLME method was successfully applied to the analysis of TFs in cucumbers, tomatoes, watermelon and grapes in agricultural products. Matrix-matched calibration standards were used to improve the accuracy of TFs in spiked cucumber samples to obtain recovery results close to 100%. It was shown that the new method is green and rapid, enabling fast and inexpensive sample pretreatment with up to 100-fold enrichment factor and low detection limit compared with the original QuEChERS method. Graphical abstract
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PubMed
高影响因子
IONICS
·
2023
·Vol. 29
·期 8
·3373-3384
·
IF 2.8
Wan Xiuying,Zhao Mengyuan,Li Fang,Zhu Gan,Zhao Hongyuan
Herein, we reported a novel niclosamide (NA) electrochemical sensor based on the multifunctional nanocomposite of palygorskite (Pal) nanofibers and bifunctional multiwalled carbon nanotubes (BMCN) with graphitization and carboxylation. For the BMCN@Pal nanocomposite, BMCN with one-dimensional nanotube structure possessed excellent electrical conductivity and good dispersion performance due to the graphitization and carboxylation; Pal with fibrous structure possessed good electrocatalytic activity due to the high absorption capability, large specific surface area, and prominent stability. Moreover, BMCN with interconnected carbon conductive network promoted the uniform distribution of Pal nanofibers and compensated for the poor electrical conductivity of Pal nanofibers. Thanks to the functional combination of BMCN and Pal, the BMCN@Pal/GCE sensor exhibited good NA electrochemical detection performance with low limit of detection of 7.88 nM in linear NA concentration of 0.01–10 μM. The BMCN@Pal/GCE sensor exhibited good repeatability and reproducibility. In addition, a good practical feasibility can be achieved at the BMCN@Pal/GCE sensor for the detection of NA in tap water and pond water samples (recovery rate: 96.2–100.3%, relative standard deviation: 2.53–4.97).
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高影响因子
Tungsten
·
2023
·Vol. 5
·期 4
·589-597
·
IF 6.6
Ma Ming-Yue,Yu Han-Zhi,Deng Li-Ming,Wang Lu-Qi,Liu Shu-Yi,Pan Hui,Ren Jian-Wei,Maximov Maxim Yu.,Hu Feng,Peng Sheng-Jie
Constructing hetero-structured catalyst is promising but still challenging to achieve overall water splitting for hydrogen production with high efficiency. Herein, we developed a sulfide-based MoS 2 /Co 1− x S@C hetero-structure for highly efficient electrochemical hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The carbon derived from the filter paper acts as a conducting carrier to ensure adequate exposure of the active sites guaranteed with improved catalytic stability. The unique hierarchical nano-sheets facilitate the charge and ion transfer by shortening the diffusion path during electro-catalysis. Meanwhile, the robust hetero-interfaces in MoS 2 /Co 1− x S@C can expose rich electrochemical active sites and facilitate the charge transfer, which further cooperates synergistically toward electro-catalytic reactions. Consequently, the optimal MoS 2 /Co 1− x S@C hetero-structures present small over-potentials toward HER (135 mV @ 10 mA·cm −2 ) and OER (230 mV @ 10 mA·cm −2 ). The MoS 2 /Co 1− x S@C electrolyzer requires an ultralow voltage of 1.6 V at the current density of 10 mA·cm −2 with excellent durability, outperforming the state-of-the-art electro-catalysts. This work sheds light on the design of the hetero-structured catalysts with interfacial engineering toward large-scale water splitting.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 11
·1-15
·
IF 2.8
Zhang Zengdong,Wang Jia,Pei Hebing,Guo Ruibin,Liu Nijuan,Mo Zunli
Electrochemical chiral recognition has gained much of attention as an efficient method for enantiomeric recognition. Herein, a chiral sensing platform via β-cyclodextrin dinuclear copper (Cu-β-CD) as a chiral selector supported on graphene/polypyrrole (RGO/Ppy) nanocomposites were fabricated for recognition of tryptophan (Trp) enantiomers. Cu-β-CD with additional chiral sites improves recognition efficiency, and the addition of the conducting polymer Ppy enhances the electrical conductivity of the nanocomposite and addresses the agglomeration effect of graphene (RGO). In addition, the composition and morphology of the materials were analyzed by transmission electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The mechanism of chiral recognition was evaluated by water contact angle experiments and UV–Vis absorption spectroscopy. And the battery of chiral recognition experiments revealed that the chiral sensing platform RGO/Ppy/Cu-β-CD/GCE provides excellent recognition of the Trp enantiomer with an enantioselectivity coefficient of 3.24. It also exhibits outstanding stability and reproducibility, with a minimum line of detection (LOD) of 0.37 mM and 1.05 mM for L-Trp and D-Trp, respectively. With these results, the RGO/Ppy/Cu-β-CD/GCE chiral sensing platform has provided a feasible approach for the electrochemical chiral recognition of Trp enantiomers.
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高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2023
·Vol. 31
·期 9
·3894-3906
·
IF 5.3
Zhang Hankun,Xu Xia,Tang Xinru,Kong Fanxing
The combined pollution of microplastics (MPs) and antibiotics in the water environment has received much attention in the past decade. MPs are often considered ideal adsorption carriers for organic matter (OM) in the water environment. Meanwhile, mechanical wear and ultraviolet radiation will make MPs age and enhance the adsorption of OM on MPs. In this study, biodegradable polylactic acid (PLA), non-biodegradable polyethylene terephthalate (PET), and polypropylene (PP) were aged by K 2 S 2 O 8 advanced oxidation. The adsorption behavior of MPs before and after aging to norfloxacin antibiotic (NOR) was studied. Results showed that the surface of MPs after aging had cracked and become rougher. The aged PLA was the most changed among the three kinds of aged MPs, and its specific surface area, equilibrium, and saturated adsorption capacity of aged PLA reached 15.826 m 2 /g, 1.184 mg/g, and 15.241 mg/g, respectively. Most of the adsorption of NOR on pristine and aged MPs was more aligned with the pseudo-first-order. The NOR was multiple adsorptions on the surface of aged PLA and aged PET, while it was monolayer adsorption on the surface of aged PP. In addition, it was different for the effect of pH, salinity, and dissolved organic matter (DOM) on the adsorption of NOR on different MPs. These results suggested that the chemical aging of MPs can enhance the adsorption capacity of MPs to NOR and promote the carrier effect of it to NOR.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 6
·976-984
·
IF 3.1
Hou Huipeng,Tang Shanshan,Wang Wei,Liu Miao,Liang Axin,Xie Bingteng,Yi Yue,Luo Aiqin
I n this work, an electrochemical chiral sensor of a nanowire-like chiral metal-organic framework/multiwalled carbon nanotube-chitosan/glassy carbon electrode( D -MOF/MWCNTs-CS/GCE) was proposed for the enantiorecognition of L / D -tryptophan( L / D -Trp). The asymmetrical spatial structure of D -MOF provides the feasibility for the enantiorecognition of Trp enantiomers. Moreover, differential pulse voltammetry(DPV) was carried out to be the detection method and the DPV peak potential difference(Δ E p ) between L -Trp and D -Trp was referred as the index of the enantiorecognition performance. Several parameters, such as mass ratios and drop-coated volume of MWCNTs-CS, drop-coated volume and concentration of D -MOF, pH and detection temperature of D -MOF/MWCNTs-CS/GCE were optimized for the largest Δ E p value. And the molecular dynamics(MD) simulation was used to elucidate the enantiorecognition mechanism. Furthermore, the proportions of D -Trp( D -Trp%) in Trp mixtures were detected in a good linear relationship with the DPV peak potentials( E p ), and the proposed electrochemical chiral sensor exhibited good reproducibility, stability and enantiorecognition ability. Additionally, the proposed electrochemical chiral sensor( D -MOF/MWCNTs-CS/GCE) has a good application prospect in the fields of biomedicine, clinical diagnosis, chemical production, pharmaceuticals safety and so on.
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高影响因子
Friction
·
2023
·Vol. 11
·期 11
·2091-2106
·
IF 6.8
Zhou Yongjun,Zhang Yuanya,Liu Meng,Wang Yanling,Yuan Junya,Men Xuehu
Epoxy resin (EP) composites with satisfactory thermal and tribological performance are highly required for engineering moving components. However, the simple addition of fillers leaded to the serious filler agglomeration and limited promotion in tribological properties. In this work, we constructed a new kind of three-dimensional (3D) reduced graphene oxide (RGO)/Si 3 N 4 hybrid aerogel for EP composites, which was prepared by a facile hydrothermal self-assembly method followed by freeze-drying technique. As a result, the dispersibility of Si 3 N 4 whiskers was greatly improved through wrapping of polydopamine—polyethyleneimine copolymer (PDA—PEI) copolymer and physical spacing of 3D skeleton. Furthermore, benefiting from the synergistic effect of RGO and Si 3 N 4 @PDA—PEI in the thermal network, the thermal conductivity of RGO/Si 3 N 4 hybrid aerogel (GSiA)—EP increased by 45.4% compared to that of the neat EP. In addition, the friction coefficient and wear rate of GSiA—EP decreased by 83.7% and 35.8%, respectively. This work is significant for opening a tribological performance enhancement strategy though constructing 3D hybrid architecture.
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高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2023
·Vol. 31
·期 7
·2999-3014
·
IF 5.3
Song Jie,Chen Lijun,Niu Yuhua,Wei Zhiqiang,Sun Yonghui
From the perspective of environmental protection, high removal rate, reusable and degradable, amino-functionalized porous hydrogel material P-(EA-β-CD/KHA/AC) was synthesized by introducing ethylamino cyclodextrin, humic acid, and activated carbon, using polyacrylic acid as the carrier. MB and Cr (VI) are common wastewater pollutants, thus, Such contaminants must be removed from the water. The gel materials before and after adsorption were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The removal of MB and Cr(VI) showed high adsorption capacity. At 298 K and pH 8, the adsorption capacities of P-(EA-β-CD/KHA/AC) hydrogel for MB and Cr(VI) were as high as 262.31 and 170.12 mg/g, respectively, and the removal rates were 98.96% and 70.27%, respectively. The adsorption behavior follows the pseudo-second-order kinetic equation, conforming to the Langmuir model; and through intermolecular forces, π–π conjugation, chelation, and other interactions, entropy-increasing, endothermic, and spontaneous process is formed. The regeneration and degradability experiments of P-(EA-β-CD/KHA/AC) hydrogel were conducted and its recycling performance was verified.
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高影响因子
FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 3
·801-810
·
IF 2.5
Wang Yi,Qin Hui,Chen Shuyi,Liu Yuan,Luo Jun,Nie Shengqiang
In this study, a highly efficient, convenient, and universal protocol of in situ cross-linking copolymerization of 2-hydroxyethyl methacrylate and sodium p-styrenesulfonate in polyvinylidene fluoride (PVDF) solution was presented to prepare blood-contacting material with good blood compatibility. The modified PVDF membranes were prepared by liquid–liquid-phase inversion technology, which could induce the enrichment of hydrophilic groups including sulfonic acid and hydroxyl groups on the surface of the modified PVDF membranes. The hydrophobic-fluorinated PVDF surfaces with hydrophilic sulphonic acid and hydroxyl groups exhibited high performance with prolonged clotting time (activated partial thromboplastin time and thrombin time) and low activation of blood components (platelets, coagulation cascade, and complements) when they contacted blood. On the other hand, the ultrafiltration experiment results revealed the improvement in the antifouling properties of the modified PVDF membranes after the introduction of hydrophilic groups on the membranes surface. The results indicate that the blood-compatible PVDF membranes may have potential to be used in the field of blood purification, and can be used as long-term blood-contacting materials as well.
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高影响因子
ANALYTICAL SCIENCES
·
2023
·Vol. 39
·期 6
·925-933
·
IF 1.6
Tang Tingfan,Li Xiaohui,Zhu Jiaqing,Huang Wenyi,Cheng Hao,Feng Jun
In this paper, a polymer monolithic column based on poly (Butyl methacrylate-co-ethylene glycol dimethacrylate) (poly (BMA-co-EDGMA)) doped with MIL-53(Al) metal–organic framework (MOF) was prepared using an in situ polymerization method. The characteristics of MIL-53(Al)-polymer monolithic column were studied through scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FT-IR), energy-dispersive spectroscopy (EDS), X-ray powder diffractometry (XRD), and nitrogen adsorption experiment. Due to its large surface area, the prepared MIL-53(Al)-polymer monolithic column has good permeability and high extraction efficiency. Using MIL-53(Al)-polymer monolithic column for solid-phase microextraction (SPME), coupled to pressurized capillary electrochromatography (pCEC), a method for the determination of trace chlorogenic acid and ferulic acid in sugarcane was established. Under optimized conditions, chlorogenic acid and ferulic acid have a good linear relationship ( r ≥ 0.9965) within the concentration range of 50.0–500 µg/mL, the detection limit is 0.017 µg/mL, and the relative standard deviation (RSD) is less than 3.2%. The spike recoveries of chlorogenic acid and ferulic acid were 96.5% and 96.7%, respectively. The results indicate that the method is sensitive, practical, and convenient. It has been successfully applied to the separation and detection of trace organic phenolic compounds in sugarcane samples. Graphical abstract
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高影响因子
危险品化学品经营许可证（带存储）