MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yuying Han,Xingyu Hou,Yali Li,Xiaopeng Yang,Xue Sun,Xinxin Bian,Na Sun,Yuguang Lv,Lixin Ding,Ze Li
This study utilized Panax notoginseng leaves carbon dots (PN-CDs) with red and blue fluorescence to detect 5-hydroxyindoleacetic acid (5-HIAA). It is a straightforward one-pot hydrothermal technique using Panax ginseng leaves to synthesize these CDs. Under 400 nm excitation, 5-HIAA decreases the fluorescence intensity at 670 nm while enhancing the fluorescence intensity at 420 nm. The fluorescence intensity ratio (F 670 /F 420 ) exhibited a significant linear relationship over the 5-HIAA concentration range of 0–100 μM. Notably, smartphones could capture the observable color change of the PN-CDs under 365 nm UV exposure and perform RGB (red/green/blue) analysis for color quantification using the smartphone’s software. The detection limit for its fluorescence detection was determined to be 0.023 μM, whereas that of mobile phone detection was 0.36 μM. This study proposes a novel platform combining fluorescence sensing and cell phone technology, facilitating real-time analysis of 5-HIAA levels in human urine.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Mengqi Wang,Ting Yang,Tiantian Yue,Zhong Wang,Jian Fang,Yuqing Liu
The interfacial interaction of carbon nanotubes (CNTs) significantly enhances the output capability of piezoelectric nanogenerators (PENGs). However, overcoming the limitation of low specific surface area in one-dimensional materials remains a significant challenge. This paper introduces a hydrothermal method for composite MOF (C-M) using CNTs and MOF-5, demonstrating localized co-doping between them. Coaxial electrospun piezoelectric fiber membranes (C-MNF) were then prepared using PVDF/PAN as the matrix. Benefiting from C-M’s excellent crystallinity and its synergistic interaction with the polymer matrix, the C-MNF-based PENG showed a 125 % increase in output voltage, reaching ∼25 V, compared to coaxial membranes simply mixing MOF-5 and CNTs. As a result, its short-circuit current was ∼1.8 μA, with a piezoelectric coefficient d 33 of ∼400 pC N −1 . Consequently, this material exhibits superior piezoelectric output capabilities, paving the way for future functional material fabrication.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Lin Gao,Luping Gu,Wentian Li,Gang Wang,Jianxin Zhao,Wei Chen,Peijun Tian
5-Hydroxytryptophan (5-HTP) is a functional food ingredient widely recognized for its sleep-enhancing properties, but it has a short elimination half-life in vivo , resulting in suboptimal pharmacokinetic performance. In this study, we developed a composite nanoparticles system based on β-cyclodextrin and corn starch using the anti-solvent precipitation method for the encapsulation and sustained release of 5-HTP. The nanoparticles were characterized using laser particle size analysis, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and evaluation of their digestive properties in simulated gastrointestinal fluids. We further evaluated their effects on the pharmacokinetic profile and distribution of 5-HTP in rats, including serum, gut, and brain, demonstrating a significant extension of the drug elimination half-life and improved bioavailability. In an insomnia mouse model, administration of the composite nanoparticles system significantly alleviated behavioral abnormalities and circadian rhythm disorder induced by sleep deprivation. This study provides a solid theoretical basis and technical support for the efficient application of 5-HTP in functional foods.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Yang Sun,Fan Yang,Siyuan Sun,Yankun Sun,Hongchen Liu,Chunhui Yu,Junpu An,Xi Li,Yongfeng Li
The preparation of highly active and stable Pd-based catalysts for direct alcohol fuel cells (DAFC) is hampered by inefficient utilization of the active sites, susceptibility to CO poisoning, poor stability, and relatively slow reaction kinetics. Herein, the stability and anti-toxicity of the catalysts (Pd/ZnO/MDC) are tuned by loading Pd nanoparticles on the carbon-coated ZnO support, achieving efficient electrocatalysis for methanol and ethanol oxidation reaction (MOR and EOR). TEM result shows the ZnO is covered by the carbon layer formed outside of MOF-5 derived porous carbon, which can prevent it from dissolving under harsh conditions. The mass activities of the well-tuned catalyst Pd/ZnO/MDC (8 0 0) for MOR and EOR are 931.83 mA/mg and 1838.30 mA/mg, respectively. It is due to the improved electron transport efficiency between the Pd and ZnO, and the enhanced stability by carbon layer outside the ZnO. It is also found that the onset potential and the peak potential of Pd/ZnO/MDC (8 0 0) (−0.813 V, −0.228 V) in CO stripping experiment in MOR are more negative than Pd/MDC (8 0 0) (−0.261 V, −0.215 V). This result indicates that the existence of ZnO helps to provide surface hydroxyl group, which promotes the oxidation of the intermediates. This work indicates provides a feasible idea for DAFC catalyst design and construction.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2017
·
IF 2.726
Qing-Qing Zhao,Xiao-Hui Wu,Ning Ren,Jian-Jun Zhang,Li-Na Geng
Two novel lanthanide complexes with the general formula [Ln(2-Br-5-MOBA) 3 (2,2′-DIPY)] 2 (Ln = Pr(1), Dy(2); 2-Br-5-MOBA = 2-bromine-5-methoxybenzoate; 2,2′-DIPY = 2,2′-bipyridine) have been successfully synthesized and characterized. The complexes 1 and 2 are isostructural and nine-coordinated with distorted monocapped square antiprismatic coordination geometry by the single-crystal X-ray diffraction analyses. Two complexes are all assembled into the 1D, 2D, 3D supramolecular structures by C H⋯O hydrogen bonding and π–π stacking interactions. The thermal decomposition mechanism for title complexes were obtained by TG/DSC-FTIR technology. The molar heat capacities of the complexes 1 and 2 are measured by a DSC instrument over the temperature range from 263.15 K to 365.15 K. On the basis of the fitted polynomial and thermodynamic equations, the smoothed values of heat capacities and thermodynamic functions ( H T - H 298.15K ), and ( S T - S 298.15K ) of the two complexes are calculated. In addition, the fluorescence spectra indicate that the complex 2 exhibits the characteristic emission of Dy(III) ion ( 4 F 9/2 → 6 H 13/2–15/2 ).
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Xiaoling Zhang,Mingbao Feng,Liansheng Wang,Ruijuan Qu,Zunyao Wang
Recently, the toxicity of sunscreen has received extensive attention due to their potential endocrine disrupting effect. In the present study, nitrogen and sulfur co-doped multi-walled carbon nanotubes loaded CuFe 2 O 4 (NS-CNTs/CuFe 2 O 4 ) catalyst was rationally designed and synthesized by co-precipitation method for the degradation of 2-phenylbenzimidazole-5-sulfonic acid (PBSA, a typical sunscreen addition). The catalyst was fully characterized by scanning electron microscope, transmission electron microscope, X-ray diffraction, Fourier transform infrared spectroscopy, nitrogen gas uptake, and X-ray photoelectron spectroscopy. Then the kinetics, pathways and mechanisms of catalytic degradation of PBSA were studied in NS-CNTs/CuFe 2 O 4 activated peroxymonosulfate (PMS) solution. The catalyst showed high catalytic activity, stability and reusability in PBSA removal. The results of electron paramagnetic resonance (EPR) and quenching experiments suggested that sulfate radicals (SO 4 − ) predominated in the activation of PMS by NS-CNTs/CuFe 2 O 4 . The synergistic effect between CuFe 2 O 4 and NS-CNTs was proposed in PMS activation. In addition, eight degradation intermediates of PBSA were identified by liquid chromatography mass spectrometry (LC–MS), and degradation pathways were further proposed. Overall, this study provides insights of PBSA removal by NS-CNTs/CuFe 2 O 4 activated PMS at ambient temperature.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Lixi Chen,Ying Wang,Xiangyang Yuan,Yi Ren,Ning Liu,Lihua Yuan,Wen Feng
Three phosphine oxide functionalized pillar[5]arenes (POP5A) were evaluated for the extraction of uranyl ion from nitric acid feed solutions in room temperature ionic liquid (RTIL), 1-n-octyl-3-methylimidazolium hexafluorophosphate (C 8 mimNTf 2 ). The host-guest interaction between POP5A and C 8 mim + for the formation of [POP5A C 8 mim] + complex was evidenced by 1D and 2D proton NMR spectroscopy and mass spectra technique before extraction, and also supported by theoretical calculation. High extraction efficiency and selective separation of UO 2 2+ were achieved with the ligand bearing longer spacer exhibiting best solvent extraction performance. The distribution ratios of U(VI) in RTIL were significantly enhanced in the range of 0.1–1.8 M HNO 3 as compared with organic diluent. The extracted species were ascertained from the slope analysis method as well as Job plots method, and a supramolecular cation-exchange mechanism involving competitive host-guest interactions was found to dominate the extraction process. This extraction system was also examined for its ability towards extraction of lanthanides and Th 4+ . The results revealed an excellent selectivity towards UO 2 2+ over other metal ions. Stripping experiments showed almost a complete back extraction of UO 2 2+ within four stages. With high selectivity towards UO 2 2+ and efficient back extraction, this new POP5A-RTIL extraction system shows promise for future application of uranium recovery.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2017
·Vol. 25
·期 4
·1007-1016
·
IF 1.624
Zhao Xinhong,Zhang Xiaoxiao,Hao Zhixin,Gao Xiangping,Liu Zhong
To synthesize zeolites in a safe and cost-saving manner is the first and the most important task for zeolite application in industry. In the present work, FeAPO-5 aluminophosphate molecular sieve with high iron content was ionothermally synthesized by microwave irradiation at ambient pressure using low dosage of eutectic mixture as the solvent. The influences of seed crystals and mechanochemical pretreatment on the synthesis of FeAPO-5 were investigated in detail. The resultant relatively pure FeAPO-5 molecular sieves were characterized by XRD, ICP-AES, SEM, N 2 physisorption and UV–Vis diffuse reflectance spectrometer, and their catalytic performances were studied using phenol hydroxylation as a probe reaction. The XRD results revealed that pure FeAPO-5 can be readily obtained from mechanochemically pretreated reactants, regardless of whether or not the seed crystals were added. The ICP-AES measurements suggested that only by using specific seed crystals can pure FeAPO-5 molecular sieve with high iron content be synthesized. The SEM analysis implied that seed crystals may play a role of morphology-directing agent in these syntheses. The catalytic results demonstrated that longer pronounced induction period were only observed over those FeAPO-5 catalysts with sole framework iron species. The different catalytic activity among five selected catalysts was largely determined by their different densities of framework iron species, while the selectivity towards dihydroxybenzene was mainly controlled by the diffusion path length. Under given reaction conditions, FeAPO-5 catalyst with up to 6.79 wt% of iron content gave 42.0% dihydroxybenzene yield with a selectivity of 94.1%.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 75
·60736-60744
·
IF 3.84
Yanfang Wang,Zhen Gu,Wentao Liu,Yuan Yao,Haijun Wang,Xiao-Feng Xia,Wei Li
A series of novel catalysts were prepared by immobilizing chromium(III) Schiff base complexes and acidic ionic liquids onto the surface of MCM-41, and characterized by FT-IR, TG, XRD, SEM, TEM, NH3-TPD, ICP-OES and N2 sorption studies. The catalytic activity of the prepared solid catalysts was investigated for the conversion of biomass (mainly including glucose, fructose and inulin) in the presence of DMSO. The dependencies of catalytic activity on reaction parameters such as temperature, reaction time and solvent were investigated and the reaction conditions were optimized. A HMF yield of 43.5% was achieved from glucose using Cr(salen)-IM-HSO4-MCM-41 as the catalyst in DMSO at 140 °C for 4 h. Furthermore, the catalyst also demonstrated good activity, and as high as 83.5% HMF was directly obtained from fructose, and the HMF yield reached 80.2% when inulin was selected as the substrate. The immobilized catalysts developed in this study present improved performance over other solid catalysts, and they have been efficiently and easily recycled at least five times without significant loss of activity in glucose conversion and HMF yield.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2013
·
IF 5.695
Yuling Hu,Zelin Huang,Jia Liao,Gongke Li
A facile and efficient strategy about the synthesis of a novel kind of hybrid magnetic metal–organic framework (MOF)-5 via chemical bonding assembly was reported. The covalent bonding established between the amino functionalized Fe3O4 nanoparticles and the surface of the metal organic framework improved the chemical stability and structure uniformity of the hybrid microcrystals. Combination of MOF-5 with Fe3O4 nanoparticles allows for facile withdrawal of the porous materials by magnetic decantation. The powder X-ray diffraction patterns of the hybrid magnetic MOF-5 showed the structure of the metal organic framework was not disturbed with the decoration of magnetic nanoparticles. The as-synthesized materials combine the favorable attributes of both magnetic characteristics of Fe3O4 nanoparticles and high porosity of metal organic framework, making them excellent candidates as adsorbents for magnetic enrichment of trace analytes. Their potential applications were explored by preconcentrating polycyclic aromatic hydrocarbons and gibberellic acids from environmental, food, and plant samples prior to gas chromatography–mass spectrometry (GC/MS) and liquid chromatography-tandem mass spectrometry (LC-MS/MS), respectively. The results showed that the magnetic MOF-5 exhibited superior enrichment capacity for both of these nonpolar and polar analytes. The method demonstrated good precision (relative standard deviations (RSDs) of 1.7–9.7%), low detection limits (0.91–1.96 ng·L–1 for polycyclic aromatic hydrocarbons and 0.006–0.08 μg L–1 for gibberellic acid), and good linearity (correlation coefficients higher than 0.9949). The RSDs of batch-to-batch extraction were 2.9–11.2%. The magnetic MOF-5 was robust enough for repeatable use without damage of extraction performance.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2013
·Vol. 180
·期 11
·1051-1057
·
IF 3.434
Wang Ai-Jun,Guo Han,Zhang Ming,Zhou Dan-Ling,Wang Rui-Zhi,Feng Jiu-Ju
We have developed a simple, sensitive and selective colorimetric method for the detection of cadmium(II) (Cd 2+ ) using gold nanoparticles modified with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole. Organic solvents or additives are not required. It is found that Cd 2+ induces the aggregation of the modified Au-NPs via chelation, leading to a color change from red to blue. This change can be seen with bare eyes, and monitored by UV–vis spectroscopy, transmission electron microscopy and dynamic light scattering. The detection limit is 30 nM (at a signal-to-noise ratio of 3). The new approach was successfully applied to the detection of Cd 2+ in spiked samples of tap water and lake water, and the results agree well with those obtained by flame atomic absorption spectroscopy.
A simple, sensitive and selective colorimetric method was developed for the detection of Cd 2+ , where 4-amino-3-hydrazino-5-mercapto-1,2,4-triazol (AHMT) modified gold nanoparticles (AuNPs) were used as optical probes. The presence of Cd 2+ induced the aggregation of the AHMT-AuNPs through the chelation process. This approach was successfully applied for the detection of Cd 2+ in spiked samples of tap water and lake water.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 45
·23797-23806
·
IF 3.708
Yunlei Zhang,Jianming Pan,Yongsheng Yan,Weidong Shi,Longbao Yu
Based on halloysite nanotubes (HNTs), precipitation polymerization and Pickering emulsion polymerization were firstly adopted to synthesize two composites i.e. HNTs–polystyrene(PSt)–polydivinylbenzene(DVB)(I) and HNTs–PSt–PDVB(II), respectively. After sulfonation by 98% H2SO4, two polymeric solid acid catalysts i.e. HNTs–PSt–PDVB–SO3H(I) and HNTs–PSt–PDVB–SO3H(II) were successfully prepared for conversion of one-pot cellulose to 5-hydroxymethylfurfural (HMF) in an ionic liquid 1-ethyl-3-methyl-imidazolium chloride ([EMIM]-Cl). Characterization of two catalysts showed that HNTs–PSt–PDVB–SO3H(I) possessed superior hydrophobicity, content of –SO3H groups, and total acidic amounts to those of HNTs–PSt–PDVB–SO3H(II), but with less very strong acidic sites and non-uniform morphology. Then the amount of the catalysts, reaction time and reaction temperature were optimized for cellulosic conversion over the two catalysts, and a maximum yield of 28.52% for HNTs–PSt–PDVB–SO3H(I) and 32.86% for HNTs–PSt–PDVB–SO3H(II) under the optimized conditions was obtained, indicating very strong acidic sites played a key role in cellulose conversion. In addition, the two as-prepared catalysts could be very easily recycled at least five times without significant loss of catalytic activity.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）