ACS Applied Energy Materials
·
2025
·
IF 5.5
Ying Wang,Bingyao Sun,Bo Zhang,Lin Chen,Jie Wang,Fuqiang Hu,Hai Liu,Quanyuan Zhang
The key to achieving high power density and a long operational lifetime in direct methanol fuel cells (DMFCs) lies in the development of proton exchange membranes exhibiting both high proton conductivity and superior chemical stability. In this study, sulfonated poly(ether ether ketones) (SPEEKs) were modified using various ratios of melamine (Mel), followed by dipping in phosphoric acid (PA), to yield SPEEK-Melx/PA membranes. The primary advantage of this approach is that the alkaline sites on melamine can immobilize PA molecules through acid–base interactions, while the resulting ionic cross-links enhance both thermal and mechanical stability. Furthermore, the proton conductivity at the acidic sites is increased due to acid–base pairing, forming an effective pathway for proton migration. Notably, the SPEEK-Melx/PA membranes demonstrated a mechanical strength exceeding 28.4 MPa and an elongation at break of over 200% under hydrated conditions, along with improved thermal stability compared to unmodified SPEEK. A maximum proton conductivity of 259.01 mS cm–1 was achieved. In DMFC testing, the membrane exhibited a peak power density of 69.74 mW cm–2 and retained 94.6% of its initial voltage after a 100-h durability assessment. These results surpassed the performance of both Nafion and unmodified SPEEK membranes. The findings suggest that melamine-cross-linked SPEEK membranes exhibit significant potential for practical application in DMFC systems.
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Polymers
·
2024
·Vol. 16
·期 20
·2946
·
IF 4.7
Lin Wang,Yuyang Li,Chenyang Yan,Xiangmei Li,Jiyu He,Rongjie Yang
In order to mitigate the release of toxic phosphine from aluminum hypophosphite in twin-screw processing, montmorillonite–melamine cyanurate was prepared by three methods: (1) mechanical intercalation, (2) water intercalation and (3) in situ intercalation. The sheet spacing of montmorillonite was increased from 1.140 nm to 1.141 nm, 1.208 nm and 1.217 nm for these three methods, respectively, and scanning electron microscope (SEM) and transmission electron microscopy (TEM) proved that melamine cyanurate was successfully inserted into the montmorillonite sheets. The montmorillonite–melamine cyanurate from in situ intercalation can best inhibit the release of PH3from aluminum hypophosphite, and the peaks of phosphine, mean values of phosphine and integral of phosphine were reduced by 81.9%, 72.1% and 72.2%, respectively. The mode of action of montmorillonite–melamine cyanuric inhibition of the emission of phosphine from aluminum hypophosphite can be attributed to the physical absorption of montmorillonite and the chemical bonding of melamine cyanurate. In addition, in situ intercalation can slightly improve flame retardancy, attributed to incomplete exfoliation of montmorillonite sheets.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Biao Li,Yuqi Liu,Baizhuang Li,Yusi He,Yufeng Zhang,Xinying Wang,Yuebin Feng,Wei Li
Tetracycline (TC) antibiotics in aquatic environments pose severe ecological and health risks due to their difficult biodegradability and environmental accumulation. Persulfate-based advanced oxidation process (PS-AOP) has been proven to be a promising method for TC degradation in wastewater treatment but requires efficient, stable catalysts. Herein, three melamine-modified POM@MOF composites WCo@C-1, WCo@C-5 and WCo@C-10 (WCo-PMOFs and melamine in mass ratios of 1:1, 1:5, and1:10, respectively) were synthesized by calcining a mixture of WCo-PMOFs and melamine, which were used as catalysts for peroxymonosulfate (PMS) activation to degrade TC efficiently. The results demonstrated that the TC degradation rate by WCo @ C-10 activated persulfate (PMS) reached 95.83 % within 2 h superior to that of WCo@C-1 and WCo@C-5 under the same experimental conditions. Notably, the WCo@C-10/PMS system exhibited exceptional cycling stability, maintaining a degradation efficiency of 83.51 % even after four consecutive cycles. The X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS) characterization results indicate that the WCo@C-10 composite material exhibits outstanding catalytic performance. This characteristic is mainly attributed to the significant improvement in the material's dispersion and its having the smallest impedance arc radius among a series of materials, which reflects a lower charge transfer resistance and excellent electrical conductivity. These characteristics synergistically promote the efficient conversion of Co(III) to Co(II). The quenching experiment combined with electron paramagnetic resonance (EPR) analysis confirmed that superoxide radicals (O 2 ·- ) and singlet oxygen ( 1 O₂) are the main reactive oxygen species in this system. This study provides a new idea for designing efficient PMS-based advanced oxidation systems.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Yiyang Rong,Guohua Ye,Surong Mao,Junshu Wang,Hanwei Wen,Jiaxing Hong
As the predominant vanadium recovery method, ammonium salt precipitation generates substantial ammonia nitrogen-containing wastewater. To overcome this limitation, we introduce an innovative vanadium precipitation approach based on melamine as a novel precipitant. Using a vanadium-rich stripping solution as feedstock, we systematically investigated the precipitation performance of melamine for vanadium and the underlying mechanisms. The effects of key parameters such as pH and dosage were examined in simulated solutions. Remarkably, this process achieves a vanadium removal rate of 99.03 % with an exceptional capacity of 1992 mg/g under mild operating conditions. Mechanistic studies indicate that both complexation and redox reactions are involved, while the unique micro–mesoporous structure of melamine synergistically enhances the capture and precipitation of vanadium species. Kinetic and isotherm analyses reveal that the process follows pseudo-second-order kinetics and is best described by monolayer chemisorption. The method was further validated with actual solutions, and response surface methodology was employed to optimize the process conditions. The optimum parameters were identified as pH = 0.86, n(melamine):n(vanadium) = 0.3, temperature = 79 °C, time = 60 min, and stirring speed = 400 rpm, yielding a precipitation rate of 94.12 %. Finally, high-purity vanadium pentoxide (99.15 %) was obtained through staged calcination. This work provides both theoretical insight and technical support for a sustainable vanadium precipitation pathway, with promising environmental and economic benefits.
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TALANTA
·
2019
·
IF 4.916
Linli Hou,Yonghai Song,Yingjie Xiao,Rong Wu,Li Wang
Lanthanide-based fluorescence sensor in the detection of major Anthrax biomarker dipicolinic acid (DPA) is attracting wide attention. In this work, we proposed a new strategy for ratiometric fluorescence detection of DPA based on microporous Ln/melamine-terephthaladehyde Schiff base networks (Ln/MTSNW) complex for the first time. The microporous MTSNW was prepared by amine-aldehyde condensation between melamine and terephthaladehyde and presented lamellar and octahedral structure. Lanthanide ions, Eu 3+ or Tb 3+ were coordinated with N atoms of MTSNW to form Ln/MTSNW complex. The microporous Ln/MTSNW complex not only provided large surface area to improve the sensitivity of DPA detection, but also constructed ratiometric fluorescence sensors to eliminate environmental effects and instrument fluctuation. DPA was a highly efficient antenna molecule for Eu 3+ and Tb 3+ and transferred the energy to Eu 3+ or Tb 3+ to sensitize their fluorescence. The Ln/MTSNW complex were uniformly and stably dispersed in aqueous solution for DPA detection with a linear range from 15 nM to 7 μM and low detection limit of 5.2 nM for Eu/MTSNW and a linear range from 4 nM to 2.5 μM and low detection limit of 1.4 nM for Tb/MTSNW. Due to the simple preparation of Ln/MTSNW complex and low technical requirement, the ratiometric fluorescence DPA sensor based on Ln/MTSNW complex might show great potential in practical applications.
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ChemElectroChem
·
2022
·Vol. 9
·期 15
·e202200455
·
IF 4.782
Guangying Gao,Chengshuai Chang,Yuxin Zhu,Chao Cong,Xiao Ma,Li Li,Li Zhang,Shulan Wang
Graphical Hierarchical porous carbon : was synthesized by using melamine as both N dopant introducer and soft structural-directing template. Benefiting from abundant heteroatom doping and proper pore structure, the as-prepared carbon sphere delivered an ultrahigh capacitance of 578 F/g at 0.2 A/g. Heteroatom-doped-carbon with high electrochemical performance is crucial for the development of advanced carbonaceous materials for energy use. However, achieving homogeneous doping while maintaining electrochemically active microstructure remains challenging. Herein, a feasible hydrothermal protocol to fabricate uniformly N-doped carbon spheres by in-situ treatment of glucose and melamine was shown. Melamine served as the soft template to introduce heteroatom dopants while releasing gases to enrich the porous structure. Profiting from the structural directing effect of melamine along with an effective fabrication route, the as-prepared material presented multiple electrochemically advantageous features including a high surface area, a hierarchical porous structure at different levels, abundant heteroatom doping, etc., and thus delivered high supercapacitance. This work provided an effective strategy for fabrication of carbonaceous scaffold for advanced heterostructured energy materials.
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ANALYTICAL CHEMISTRY
·
2016
·
IF 5.886
Caili Fu,Chang Liu,Ying Li,Yajing Guo,Fang Luo,Peilong Wang,Longhua Guo,Bin Qiu,Zhenyu Lin
Abasic site (AP site) in the triplex structure can recognize specific target with high selectivity. In this study, this character was first applied to develop a simple, sensitive, and selective homogeneous electrochemical biosensor for melamine determination. The assay combines the advantage of the high selectivity of the DNA triplex structure containing an AP site to melamine and high efficiency of exonuclease (Exo) III-assisted recycling amplification. DNA-1 (T1), DNA-2 (T2), poly[dA] probe containing an AP site (8A) and methylene blue-labeled DNA probe (dMB probe) were carefully designed. Melamine can specifically locate in the AP site through hydrogen bonding interaction between thymine and melamine to make T1, T2, and 8A close to each other, therefore, forming a stable T-melamine-T DNA triplex structure. Under the optimal conditions, the differential pulse voltammetric (DPV) response had a linear relationship with the logarithm of melamine concentration in the range of 1 nM∼0.5 μM. The developed biosensor has been successfully applied to detect the migration of melamine from melamine bowl. Result showed that the migration in 4% acetic acid solvent was the largest, which is similar to that detected by high performance liquid chromatography. This homogeneous electrochemical sensor may have a potential prospect in detecting melamine in dairy products and migration of melamine from multicategory food packaging or application materials.
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PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Yun Feng,Wei Qu,Yuzhang Wu,Jingpeng Zhang,Limin Peng
Melamine–formaldehyde (MF) resin-impregnated paper-decorated panels are prone to surface cracking, which can be reduced by changing the brittle structure of the MF resin. To increase the curing degree and toughness of the resin, a hexamethylene diisocyanate trimer blocked with methyl ethyl ketoxime (ME-HDI-tri) was used as a temperature-responsive crosslinker. This latent crosslinking agent only worked above 120 °C, which prevented it from participating in cross-linking reactions during the preparation of the impregnated paper. The chemical structures of the modified MF resins (ME-HDI-tri-MF) were characterized by Fourier-transform infrared (FTIR) spectroscopy. The curing behaviors of the MF resins were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and dynamic mechanical thermal analysis (DMTA). Impregnated paper was prepared with ME-HDI-tri-MF, and its tensile strength and elongation at break were tested. Blockboard was prepared with ME-HDI-tri-MF, and its cracking and corrosion resistance were tested. The absorption peak of the methylene chain was observed in the FTIR spectrum of ME-HDI-tri-MF after curing, which indicated that ME-HDI-tri participated in the curing reaction of the MF resin. With the addition of ME-HDI-tri 5 %, the curing temperature of the MF resin decreased from 142 °C to 130 °C, and the ultimate tensile stress and elongation at break of the modified impregnated paper increased by 97.70 % and 86.25 %, respectively. The cracking and corrosion resistance of the decorated panel prepared with ME-HDI-tri-MF were also improved. After adding 3 % ME-HDI-tri, the surface cracking of the decorated panels was prevented, which extended the service life and broadened the application range of the decorated panels.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 2
·853-861
·
IF 1.483
Zheng Hongru,Li Ying,Xu Jingyue,Bie Jiaxin,Liu Xin,Guo Jiajia,Luo Yeli,Shen Fei,Sun Chunyan,Yu Yali
In this paper, a rapid and facile visual method for detecting melamine in raw milk was developed by using T-rich single-stranded DNA (ssDNA) aptamers as the recognition element and cysteamine-stabilized gold nanoparticles (CS-AuNPs) as the color indicator. The electrostatic interaction
between the negatively-charged melamine-binding aptamers and the positively-charged CS-AuNPs induced the aggregation of the CS-AuNPs and a remarkable change in color from wine red to blue. The specific recognition between melamine and T-rich aptamers could cause the formation of melamine-aptamer
complex through hydrogen bonding. Compared with the electrostatic interaction between CS-AuNPs and aptamers, the strongly specific recognition between melamine and aptamers played a dominant role, thus the presence of melamine could prevent the aptamers-induced aggregation and color change
of CS-AuNPs. As a result of this, using CS-AuNPs as the colorimetric probe, a simple and sensitive aptasensor for melamine determination is developed. Under the optimum conditions, the absorbance change (ΔA
526) of CS-AuNPs was linearly proportional to melamine concentration
in the range of 1–24 nM, with the detection limit of 0.389 nM. The application of the proposed method for the determination of melamine in raw milk samples spiked with different amounts of melamine suggested satisfactory recoveries between 92.8% and 112.2%, which are in full accordance
with the results from HPLC. Due to the advantages of low cost, high sensitivity, simple operation procedure, reduced detection time, and practical application, this method would be expected for on-site and real-time screening of melamine in raw milk.
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MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Jiujun Wang,Ya Wu,Qinghua Wu,Li Li,Yun Wang,Hualin Yang
Melamine has a high nitrogen content thus is often illegally added to milk powder to phonily boost the protein percentage composition. Milk products containing melamine are harmful to babies and children. In the present work, a simple, label-free and turn-on fluorescence method to detect melamine with a high sensitivity and selectivity has been developed. The N -methylmesoporphyrin IX (NMM)/G-quadruplex structure is used as a signal reporter in this method to realize label-free detection of melamine. The detection limit of this method is 12.5 nM, which is much less than the maximum level permitted for infant formulas. The linear range is 0.05–1 μM ( R 2 = 0.98). The selectivity of this method is also very satisfactory. Furthermore, this method can be successfully applied for detection melamine in raw milk and milk powder.
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DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Guoqiang Xie,Guofu Li,Di Chen,Xiangyu Meng,Chuanjun Fan,Beili Pang,Yingchao Zhang,Yingjie Chen,Liyan Yu,Lifeng Dong
Non-enzymatic glucose detections have attracted more and more attentions with the development of electrochemical catalysts. Herein, Co 2+ and Cu 2+ are introduced into the hexagonal prism of melamine cyanurate, and nitrogen-doped carbon seaweed-like nanosheets (CoCu@MC) are synthesized through pyrolysis . CoCu@MC shows superior electrochemical catalytic activity for glucose oxidation with high sensitivity (1.489 μA μM −1 cm −2 ), low detection limit (0.34 μM) and wide linear range (1 μM–1.25 mM). Also, CoCu@MC demonstrates excellent application potential for glucose detection in artificial sweat with good conductivity, fast electron transfer , and high selectivity, which result from CoCu bimetal composites and seaweed-like carbon nanostructures . The glassy carbon electrode coated with CoCu@MC was used as the working electrode along with Ag/AgCl as the reference electrode and carbon rod as the counter electrode. The findings above will provide a general methodology to design and synthesize different carbon nanostructures through the addition of different transition metal cations.
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CRYSTENGCOMM
·
2016
·Vol. 18
·期 40
·7805-7813
·
IF 3.849
Xiu Liang,Xiao-Juan Zhang,Ting-Ting You,Guang-Sheng Wang,Peng-Gang Yin,Lin Guo
A new, feasible, and highly efficient platform was developed using self-assembly of (3-aminopropyl) diethoxymethylsilane (ATES) to create metallic oxide-based noble metal nanoparticle hybrid materials. The ex situ approach for fabricating 1D MoO3-nanowires (MoO3-NWs) or ZnO-nanorods (ZnO-NRs) @Au-nanoparticles (Au-NPs) hybrid surface-enhanced Raman scattering (SERS) substrates not only provides a simple route for the decoration of noble metal nanoparticle on metallic oxide nanomaterials, but also realizes the controllable assembly/co-assembly of pre-synthesized nanoparticles with distinctively different sizes, compositions, shapes, and properties. Control over the self-assembly synthesis for morphology and SERS activity was demonstrated by several parameters: (i) coupling agent of ATES, (ii) ATES content, (iii) Au-NPs content, (iv) Au-NP sizes, and (v) other metallic oxide such as ZnO-NRs. The finite difference time domain (FDTD) method was employed to visualize the enhancement mechanism distribution of the hybrid substrate. Furthermore, the optimized MoO3-NW@Au-NPs SERS substrate manifests high SERS sensitivity to melamine with a limit of detection (LOD) of 0.1 ppb (0.08 nM) and excellent uniformity (RSD = 9.26%). The LOD was much lower than the maximal residue limit (MRL) of 2.5 ppm in food prescribed by the US Food and Drug Administration (FDA).
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危险品化学品经营许可证（带存储）