SPECTROSCOPY LETTERS
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2014
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IF 0.718
Jing Zhang,Yijin Ren,Fang Chang,Qiuyi Shi
A fixed time point on the curve of the absorbance variation with time determined in the hydroxyl polyaluminum solution by 7-iodine-8-hydroxyquinoline-5-sulfonic acid-timed spectrometry is usually used to quantify the mononuclear aluminum species in the hydroxyl polyaluminum solution. The right choice of the determining time of mononuclear Al must be established on the basis of the sufficient reaction between chromogenic reagent and the hydroxyl polyaluminum solution. But this question has never been noted, which resulted in the confusion of application and research of this assay. In this work, the effect of variation of the determining time on the accurate determination of mononuclear Al in the hydroxyl polyaluminum solution was first studied. The experimental results showed that 60 s was the best under the appropriate dosage of 7-iodine-8-hydroxyquinoline-5-sulfonic acid. The reasonableness of 60 s was further verified by 27Al nuclear magnetic resonance spectrometer and the absorbance–time curve obtained from the pure mononuclear Al solution with pH < 2. The above conclusion was further used to analyze the results reported in literature. The mononuclear Al determined at 60, >60, and <60 s in the literature were comparable to the corresponding results of this study.
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RSC Advances
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2017
·Vol. 7
·期 27
·16423-16427
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IF 3.108
Guangming Li,Nan Lv,Jilin Zhang,Jiazuan Ni
A sensitive fluorescent nanosensor based on MnO2 quenching fluorescent carbon quantum dots was facilely developed by MnO2 in situ formed in the pores of C-dots/ZIF-8 hybrid nanocomposite. The C-dots/ZIF-8 hybrid nanocomposite was synthesized via a rapid method within 5 min at room temperature. Then, the MnO2 was directly incorporated into the ZIF-8 framework via redox reaction between the C-dots/ZIF-8 hybrid nanocomposite and KMnO4. The resulting fluorescent nanosensor exhibited a relatively uniform particle size of about 100 nm, good water-dispersibility and a highly selective fluorescence response toward ascorbic acid with a detection limit as low as 83 nM and a linear range of 0.5–8 μM.
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EUROPEAN POLYMER JOURNAL
·
2016
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IF 3.485
Tao Chen,Xiaohua Han,Zhi Peng,Aihua Li,Jingquan Liu
7, 8-Dihydroxyflavone (7, 8-DHF) is an effective drug for the treatment of Parkinson’s disease. However, its application is heavily limited by its poor water solubility. To improve its hydrophilicity, biocompatible poly (ethylene glycol)acrylate (PEG-A) was grafted onto 7, 8-DHF via in situ reversible addition-fragmentation chain transfer (RAFT) polymerization, forming a kind of a drug/polymer composite, DHF/PPEG-A. It was found that the solubility of DHF/PPEG-A was significantly improved by 78 times compared to the unmodified precursor. Impressively, both the cytotoxicity and the drug efficacy of the synthesized DHF/PPEG-A just slightly decreased compared with the unmodified 7, 8-DHF. Moreover, the drug efficacy of DHF/PPEG-A can be regained by the hydrolysis in the presence of the esterase D due to the decomposition to 7, 8-DHF in body. This dramatical improvement of the water solubility of DHF/PPEG-A and the insignificant compromise of its drug cytotoxicity could envision extensive practical clinical administration of 7, 8-DHF for enhanced drug efficacy.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Longfei Qiao,Yu Shu,Yan Gao,Hua Fan,Jiaqing Zhao,Jingjing Zhang,Hiroshi Uyama,Yehua Shen
The physical properties and chemical compositions of porous carbons are crucial factors in determining their effectiveness in adsorbing CO 2 . Cellulose-based porous carbon has emerged as an outstanding candidate adsorbent for CO 2 capture. The research involved the creation of hierarchically nitrogen-doped porous carbon (HNC) using a 3D cellulose alcogel (CA) as substrate, which was prepared through a thermal introduced phase separation (TIPS) method combined with hydrolysis treatment. The plentiful functional groups of CA offered abundant growth sites for the introduction of ZIF-8 crystals. CA/ZIF-8 composite alcogel (CZA) with greater surface area and superior thermal stability compared to CA was successfully fabricated and used as precursor for the production of HNC. The important effects of microporosity and surface chemistry of HNC samples on CO 2 capture were discussed in-depth. HNC-350–850 displayed a hierarchically porous structure with a large number of micropores and abundant N/O/Zn-doped functional groups, exhibiting high CO 2 uptakes at 1 bar (3.56 mmol/g at 25 °C), good IAST CO 2 /N 2 (15/85, V/V) selectivity of 16.31 at 25 °C, and outstanding regenerability with ∼100 % CO 2 adsorption capacity retained after ten cycles. In the two-component CO 2 /N 2 (15/85, V/V) competitive adsorption process, the maximum breakthrough periods for CO 2 (433.1 s) is significantly longer than that of N 2 (3.8 s). The CO 2 breakthrough adsorption capacity reached 1.79 mmol/g at 25 °C and 1 bar with the separation coefficient of 45.8 for CO 2 over N 2 . These results confirmed that HNC, in addition to having excellent CO 2 /N 2 selectivity, demonstrated good feasibility for practical use. The green and practicable synthetic route described in this study is not only expected to offer novel adsorbents for high performance CO 2 capture, but also provide a new theoretical foundation for the development of cellulose-based porous materials.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
·
IF 4.1
Haopeng Gao,Kangming Wang,Xiangyu He,De Li,Cheng Zheng,Yong Chen
Dual-ion batteries (DIB) have drawn much attention because of their advantages such as low cost, high energy density, and high power density. Graphite has been considered as one of the most promising cathode materials for DIBs due to its low cost, good electron conductivity, environment friendliness and unique two-dimensional layered structure. However, graphite still suffers from limited cycling stability caused by the structural collapse of graphite, resulting from the repeated intercalation/deintercalation of anions, solvent co-intercalation, and electrolyte decomposition on the electrode/electrolyte interface. In this work, the electrochemical performances of graphite cathode are significantly enhanced through a simple way by in-situ coating of the hydrolysate Zn 5 (HMIM) 4 (MIM) 6 (OH) 4 (labeled as ZnHM) derived from ZIF-8, which was performed in aqueous solution at room temperature. It is found that a capacity retention as high as 84 % with the discharge capacity of 65 mA h g −1 after 1000 cycles at 100 mA g −1 was achieved. More importantly, ca. 70 % of the initial discharge capacity is retained even after 3000 cycles at 500 mA g −1 . These remarkable electrochemical properties are attributed to the coating layers of ZnHM on graphite surface, which inhibit the co-intercalation of solvent molecules, keep the structural stability of graphite, and hinder the decomposition of electrolyte.
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TALANTA
·
2024
·
IF 5.6
Yaqin Zhan,Jinru Cao,Ying Wang,Xuesong Li,Yixing Li,Huihui Zeng,Wenyi Huang,Hao Cheng,Si Gao,Lijun Li,Jun Feng
Surface Enhanced Raman Scattering (SERS) has been extensively utilized in therapeutic drug monitoring (TDM) due to its rapid detection speed, high sensitivity and straightforward sample pretreatment. In this study, Au/AgNPs were obtained through the reduction of AgNO 3 on the surface of AuNPs. Subsequently, Au/AgNPs were embedded into the tetrahedral lattice of ZIF-8 MOFs, resulting in the formation of Au/Ag@ZIF-8 nanocomposites. The Au/Ag@ZIF-8 nanocomposites exhibit a robust electromagnetic enhancement of Au/Ag bimetallic nanoparticles and a considerable adsorption capacity of ZIF-8 MOFs. This enables the pre-enrichment of target molecules in the vicinity of the electromagnetic field of the Au/AgNPs, thereby enhancing the sensitivity of SERS detection. The SERS substrate also exhibits high stability and reproducibility, as well as molecular sieving effects, due to the fact that Au/AgNPs are embedded into the tetrahedral lattice of ZIF-8. A TDM method for tacrolimus (FK506) in human serum was developed by using Au/Ag@ZIF-8 nanocomposites as solid phase extraction (SPE) adsorbent and SERS substrates. The results showed that under the optimized conditions, tacrolimus exhibited satisfactory linearity within the concentration range of 10 −5 -10 −11 mol L −1 , with a correlation coefficient (R 2 ) of 0.9944, and the limit of detection (LOD) was as low as 6.4 pg mL −1 . The recoveries were observed to range between 92 % and 105 %, with an RSD of below 8 %. The method is highly sensitive, exhibiting a sensitivity that is 3-6 orders of magnitude higher than that of existing analytical techniques. It has the potential to be applied in a clinical setting to biological samples.
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PubMed
高影响因子
Food Chemistry-X
·
2024
·
IF 6.5
Xingyu Zhu,Chong Chen,Dou Che,Hui Yan
To improve the activity of single-atom nanozymes (SAzymes) for applications in food analysis, a new bimetal SAzyme FeCe/NC was developed. Its oxidase-like activity is 40% higher than that of single metal SAzyme Fe/NC. Based on a series of characterization investigations, the catalytic mechanism is that it directly catalyzed O 2 to generate • OH, O 2 • - and 1 O 2 . It could directly catalyze oxidation 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxTMB, thereunder, a FeCe/NC SAzyme-TMB colorimetric method for the detection of tannic acid (TA) was constructed after the optimization of catalytic conditions. The method has a high R 2 of 0.995, a low limit of detection (LOD) of 0.26 μmol/L, and high stability. The detection performance was validated by the real samples (tea). Therefore, the prepared bimetallic SAzyme FeCe/NC can be applied for TA detection without the addition of H 2 O 2 , and will have broad applications in the areas of food, feed, and life science.
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PubMed
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MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Le-Yan Feng,Zhenhua Tang,Nuan Xu,Jiaxin Huang,Yan-Ping Jiang,Xin-Gui Tang,You Zeng,Shang-Xian Chen
Antibiotics play an essential function in treating various diseases. However, their overuse has led to water pollution and food safety issues. This work discusses a highly sensitive ratiometric fluorescent flexible sensor based on multifunctional 4-MU@ZIF-8@PLA-PEG composite film prepared using a low-toxicity, eco-friendly and self-assembly method. The sensor combines the luminescent properties and structural tunability of ZIF-based composites with the processability and flexibility of polymers. The 4-MU@ZIF-8@PLA-PEG sensor can detect tetracycline (TC), oxytetracycline (OTC), chlortetracycline hydrochloride (CTC⋅HCl), and doxycycline hydrochloride (DOX⋅HCl) with dual-emission ratiometric fluorescence, exhibiting a visible color change from blue to yellow, with detection limits of 0.058 nM, 16.806 nM, 2.113 nM and 20.510 nM, respectively. The fluorescence characteristics exhibit excellent linear relationships with TC detection in tap water and milk, and show inhibition rates of 87.27 % and 76.61 % against E. coli and S. aureus . With its antibacterial activity, visual detection, high sensitivity, and short detection time, this sensor has significant potential for detecting antibiotics in aquatic environments and food safety applications.
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Analytical Methods
·
2025
·
IF 2.6
Jianhua Luan,Xin Zhang,Wenjing Qian,Xinyu Zhang,Mengru Shu,Xiubo Zhao,Nan Wang
Chromium(VI) ions (Cr(VI)) are highly toxic heavy metal pollutants, and their rapid detection holds significant importance for environmental protection. In this study, a colorimetric detection platform was developed using a copper-based porphyrin metal–organic framework (CuTCPP) with peroxidase-like (POD) activity. 8-Hydroxyquinoline (8-HQ) was used to inhibit the color-forming reaction. Upon the addition of the target analyte, Cr(VI), the colorimetric response was restored, since Cr(VI) can preferentially form a chelate with 8-HQ. Results showed that the detection system exhibited a linear range from 50 nM to 10 μM (R2 = 0.999) with a low detection limit (LOD) of 22.3 nM, demonstrating excellent selectivity even in the presence of multiple interfering ions. The proposed intelligent response mechanism provided a visual, rapid, and user-friendly solution for on-site monitoring of Cr(VI) contamination, showing promising application potential in environmental analysis.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Haonan Zhang,Huaibao Tang,Ling Fang,Yunchuan Luo,Jie Zhou,Leilei Shu,Olim Ruzimuradov,Shavkat Mamatkulov,Butanov Khakimjan Turamuradovich,Kamoladdin Saidov,Dae Joon Kang,Wen He,Peihong Wang
The advanced flexible wearable self-charging power system (SCPS) offers exciting development prospects for flexible electronics, medical sensing, and environmental monitoring. However, constructing a SCPS with fast charging rate still remains a significant challenge. Therefore, in this study, a flexible SCPS featuring rapid charging rate has been designed. Micro-supercapacitors (MSCs) with a synaptic structure were fabricated via electrospinning technique followed with laser engraving, employing polyethylene glycol diacrylate/sulfuric acid gel and ZIF-8@MXene/carbon nanofibers as the polymer gel electrolyte and electrodes, respectively. The specific capacitance of the synaptic-structured MSCs was measured to be 25.5 F g −1 . The power management circuit (PMC) converts the AC output generated by the Ecoflex/BTO triboelectric nanogenerator (TENG) into a stable DC output through periodic conduction, thus greatly reducing the impedance gap between TENG and MSCs, enabling SCPS to efficiently collect high-entropy energy from the environment. The average charging rate could of SCPS reach as high as 26 mV s −1 , which is 14.5 times higher than that achieved with a rectifier, and significantly higher than that reported in the literature. The as-prepared SCPS could provide important support for green energy and sustainable development.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Peiyuan Zhu,Junxian Yang,Fangfei Sun,Kun Wang,Hui Li,Lincai Peng
The widespread environmental issues caused by plastic packaging have driven the search for sustainable alternatives. In this study, we report a facile and scalable layer-by-layer (LBL) spraying strategy to fabricate superhydrophobic paper-based packaging materials with integrated photothermal and photodynamic antibacterial activities. Cellulose paper was modified through the alternate deposition of collagen (COL) and polydopamine-hybridized ZIF-8 (PDA@ZIF-8) nanoparticles to construct hierarchical micro/nano structures, followed by polydimethylsiloxane (PDMS) treatment. The resulting superhydrophobic paper demonstrated remarkable water repellency, self-cleaning and antibacterial adhesion performance. In contrast to original paper, this functional paper also exhibited enhanced mechanical properties and gas barrier. Under 808 nm near-infrared (NIR) irradiation, it generated localized heat and reactive oxygen species (ROS), achieving up to 100 % inhibition against Staphylococcus aureus and Escherichia coli . Moreover, the modified paper demonstrated good biocompatibility and biodegradability, meeting food safety requirements while addressing environmental sustainability. Preservation packaging tests revealed that this functional paper, when combined with NIR irradiation, effectively preserved the quality and freshness of blueberries for 8 days during ambient storage. This work presents a promising strategy for the development of multifunctional and biodegradable paper-based packaging materials, showing great potential for green and active food packaging applications.
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JOM
·
2025
·
IF 2.3
Wu Shijie,Gu Haiquan,Chen Zhimin,Jia Jun,Sun Liang,Li Yafeng
Nitrogen- and oxygen-doped high specific surfaces of activated carbon with an optimized pore system have been obtained by the method of calcination at 1000°C, using ZIF-8 as the precursor. The ZnCl 2 is as the activating agent, which is reduced to Zn 0 by the carbon in the precursor. And the specific surface area of activated carbon can reach up to 2569 m 2 g −1 . This is comparable to the specific surface area of activated carbon produced with KOH as the activating agent. The N 2 isothermal adsorption–desorption at 77 K indicates that the specific surface area of N-doped super-activated carbon increases a little to 2838 m 2 g −1 , when the urea has been incorporated into the precursor as extra an nitrogen source. Interaction between N- and O-doped carbon and K + ions in KOH is illustrated by the corresponding density function theory (DFT), and the electron cloud between K and the carbon material is simulated. The electrochemical measurements were conducted in 6 M KOH and 1 M Na 2 SO 4 , which confirms that nitrogen and oxygen doping has a significant increase in specific capacitance. The super-activated carbon with an optimized pore system possesses excellent electrochemical performance, which shows good application prospects for energy storage.
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