BIOSENSORS & BIOELECTRONICS
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2016
·
IF 7.476
Rongli Zhang,Sheng Xu,Ye Zhu,Wei Zhao,Jing Luo,Xiaoya Liu,Dingxing Tang
A voltammetric sensor for melamine (MEL) was prepared from molecularly imprinted nanohybrids (MINBs). A dopamine modified poly-γ-glutamic acid copolymer (γ-PGA-DA) and MEL were self-assembled into MEL/γ-PGA-DA nanoparticles (NPs) in aqueous solution via weak interactions, followed by adding an aqueous AgNO 3 solution into the mixture. The Ag + was adsorbed in the MEL/γ-PGA-DA NPs and spontaneously reduced to Ag NPs by the dopamine moieties of γ-PGA-DA, forming Ag/MEL/γ-PGA-DA MINBs, which were then cast on a gold electrode to form a MINBs film. The MEL was removed by electrolysis via catalysis of Ag NPs at a constant potential of 1.4 V in phosphate buffer saline solution , to obtain a voltammetric sensor for MEL. The sensor responded linearly to MEL in the concentration range of 5×10 −18 to 5×10 −7 mol L −1 . Compared to other published molecularly imprinted polymer sensors for sensing MEL, the prepared MINBs sensor had much wider detection range with lower detection limit.
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PubMed
高影响因子
IONICS
·
2016
·Vol. 22
·期 10
·1937-1945
·
IF 2.119
Ren Jujie,Li Liujia,Cui Min,Zhai Miao,Yu Congcong,Ji Xueping
A novel and convenient electrochemical sensor, based on multi-walled carbon nanotube (MWCNT)–poly-melamine(PMel)–silver nanoparticle (AgNP) composite-modified glassy carbon electrode (GCE), was fabricated for the determination of nitrobenzene (NB). The modified electrode not only played an efficient electrocatalytic role for the reduction of NB but also significantly reduced the overpotential of NB, and the peak current increased greatly compared with bare GCE or other modified electrodes. The excellent performance of NB sensor can be ascribed to the synergistic effect between MWCNT and AgNP. The synergistic effect promoted the electron transfer between MWCNT and AgNP significantly and enhanced the electrochemical reduction ability of NB remarkably. Besides, PMel has huge nitrogen and amine groups, which contributes to the dispersion of silver nanoparticles and also improves the electrocatalytic activity and sensitivity of the sensor. The integration of PMel/MWCNT with AgNP provided a high-performance platform for the NB determination. Under the optimized experimental conditions, the developed sensor showed a wide linear calibration ranges from 20 to 1000 μM and from 1000 to 6000 μM, with a low detection limit (0.55 μM) for the detection of NB. At the same time, the modified electrode exhibited good stability and reproducibility and acceptable selectivity. Moreover, the proposed sensors were successfully employed to determine NB in real samples, and the recoveries were between 97.2 and 104.6 %.
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高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Wanqing Zhang,Guangri Xu,Runqiang Liu,Jun Chen,Xiaobo Li,Yadong Zhang,Yuping Zhang
A sensitive and selective sensor was fabricated to determine melamine (Mel), based on MIL-53@XC-72 nanohybrid modified glassy carbon electrode (GCE). The MIL-53@XC-72 nanohybrid was synthesized from MIL-53 via hydrothermal method, followed by adulterating with XC-72. The prepared sensor possessed high sensitivity and selectivity due to the synergistic effect of the large surface of MIL-53, the bonding interaction between Mel and MIL-53 as well as the high conductivity of XC-72. Under the optimal conditions, the sensor exhibited rapid electrochemical response to Mel at the potential of 0.7 V in 0.1 M HCl solution. A linear concentration range of Mel was obtained from 0.04 to 10 μM with a linear correlation coefficient of 0.998 and detection limit of 0.005 μM (S/N = 3). In addition, the sensor presented excellent reproducibility, high stability and selectivity, and was successfully applied for the determination of Mel in liquid milk with a good recoveries. Hence, the MOFs@XC-72-Nafion-GCE sensor could be considered as promising applicability for the determination of other electrochemically inactive analytes.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2014
·Vol. 49
·期 7
·2853-2863
·
IF 2.305
Xu Xiuzhu,Chen Shuixia,Zhuang Linzhou,Zheng Chunhao,Wu Yingzhu
A surface molecular-imprinting system was developed on polypropylene (PP) fiber for melamine (Mel) as an N-containing template. In this article, acrylic acid was introduced onto the surface of PP for template binding. Subsequently, binding sites on PP were stabilized by crosslinking with ethylene glycol diglycidyl ether in the presence of Mel. The imprinted fiber (MIF-Mel) prepared with the optimal 15 % crosslinking density showed best-imprinting effect, with an imprinting factor of 2.18 respect to nonimprinted fiber, and a relative selectivity coefficient k ′ of 10.40 for Mel with respect to its structural analog 2,4-dinitroaniline. MIF-Mel showed higher affinity to Mel with the maximum adsorption capacity of 15.5 mg g −1 , while that on nonimprinted fiber was only 6.9 mg g −1 . Its adsorption isotherm was well described using Langmuir model. Kinetic studies showed a rapid-binding interaction and high affinity of the MIF-Mel for its template, with a 2.5 times higher in binding amount and 4.7 times faster in binding speed than those of granular molecular-imprinting polymer with the same chemical structure. High degree of fitness with pseudo-second-order model revealed chemisorption was the rate-controlling step in the template-binding process. Basic theory of matrix–template interaction in this imprinting system was clarified to be dominated by electrostatic force synergized by hydrogen bonding between deprotonated carboxyl groups and protonated N atom in the template. It suggests that extension of this novel approach or theory to other imprinting system involving nitrogenous templates is very likely.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 13
·5297-5304
·
IF 3.269
Fengqin Yin,Peixuan Peng,Wenjie Mo,Shuixia Chen,Teng Xu
A porous amino resin melamine–formaldehyde (MF) with a high content of hydroxymethyl groups was prepared via the polycondensation of an excess of formaldehyde with melamine. Polyethylene imine (PEI) was then grafted onto the porous amino resin via a Mannich reaction between the active hydroxymethyl groups on the MF resin and the amino group on PEI to synthesize a solid amine adsorbent (MF-g-PEI). A large amount of hydroxymethyl groups were generated on the synthesized amino resin due to the excess formaldehyde used in the polycondensation reaction, which will provide abundant active sites to firmly combine with PEI and thus, enhance the stability of the MF-g-PEI adsorbent. The BET surface area and the pore volume of MF-g-PEI prepared using the optimal conditions were 460 m2 g−1 and 0.76 cm3 g−1, respectively. The CO2 adsorption capacity of MF-g-PEI, with a PEI loading of 11.35% can reach 1.32 mmol g−1 at 10 °C, while its amine utilization efficiency can reach up to 48.9%. The adsorbents also exhibited significantly improved adsorption kinetics and regeneration performance. This work provides a novel method that can achieve a promising solid amine adsorbent by directly grafting PEI onto porous material in the absence of an intermediate.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Ahai Zhu,Jian Zheng,Zhijia Zhu,Chunyan Hu,Baojiang Liu
The escalating problem of oily wastewater and microplastic pollution poses a significant threat to our environment. Addressing this challenge has been hampered by the lack of sustainable materials capable of handling multiple pollutants effectively. However, this research introduces a groundbreaking approach for designing a superhydrophobic composite sponge, MS@ZnCo-ZIF@HDTMS. Utilizing a straightforward layer-by-layer self-assembly strategy, this work achieved the robust integration of bimetallic organic framework (ZnCo-ZIF) onto the sponge surface. This integration was facilitated by the adhesive and ion exchange properties of polydopamine (PDA), thereby constructing intricate micro- and nanocomposite structures. The immense specific surface area of ZnCo-ZIF offered numerous absorption sites for the assembly of PDA and hexadecyltrimethoxysilane (HDTMS). Remarkably, the composite sponge exhibits superhydrophobic and superoleophilic properties, demonstrating exceptional oil absorption capacities ranging from 55 g/g to 96 g/g, even after enduring 50 cycles. Moreover, MS@ZnCo-ZIF@HDTMS possesses remarkable mechanical and chemical stability. Its gravity-driven oil-water separation capabilities are noteworthy, achieving a permeate flux of 10,000 L m -2 h -1 and a removal rate of up to 99.2 %. Crucially, the superhydrophobic nature of the composite sponge, coupled with capillary effect, Van der Waals forces, hydrogen bonding , and other interactions, enables MS@ZnCo-ZIF@HDTMS to capture a diverse range of microplastics from water relatively swiftly. Therefore, this work not only provides effective candidates for the sustainable treatment of oil and microplastics in water but also opens new avenues for the restoration of aquatic environments.
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高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2024
·Vol. 30
·期 3
·284-296
·
IF 6.7
Xuan Jie,Guan Guijian,Han Ming-Yong
Because of the low reactivity of cyclic nitrides, liquid-phase synthesis of carbon nitride introduces challenges despite its favorable potential for energy-efficient preparation and superior applications. In this study, we demonstrate a strong interaction between citric acid and melamine through experimental observation and theoretical simulation, which effectively activates melamine-condensation activity and produces carbon-rich carbon nitride nanosheets (CCN NSs) during hydrothermal reaction. Under a large specific surface area and increased light absorption, these CCN NSs demonstrate significantly enhanced photocatalytic activity in CO 2 reduction, increasing the CO production rate by approximately tenfold compared with hexagonal melamine (h-Me). Moreover, the product selectivity of CCN NSs reaches up to 93.5% to generate CO from CO 2 . Furthermore, the annealed CCN NSs exhibit a CO conversion rate of up to 95.30 μmol/(g h), which indicates an 18-fold increase compared with traditional carbon nitride. During the CCN NS synthesis, nitrogen-doped carbon quantum dots (NDC QDs) are simultaneously produced and remain suspended in the supernatant after centrifugation. These QDs disperse well in water and exhibit excellent luminescent properties (QY = 67.2%), allowing their application in the design of selective and sensitive sensors to detect pollutants such as pesticide 2,4-dichlorophenol with a detection limit of as low as 0.04 µmol/L. Notably, the simultaneous synthesis of CCN NSs and NDC QDs provides a cost-effective and highly efficient process, yielding products with superior capabilities for catalytic conversion of CO 2 and pollutant detection, respectively.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2025
·
IF 2.5
Wang Wenbo,Li Guoxuan,Yang Guanda,Schubert Dirk W.
This study investigates the multifunctional properties of a carbon black (CB)- and polyvinyl alcohol (PVA)-modified melamine sponge, focusing on flame retardancy, electromagnetic wave absorption, and sensing capabilities. Scanning electron microscopy analysis reveals the microstructural changes induced by CB modification, with CB particles forming a continuous layer on the sponge skeleton. Thermal analysis via thermogravimetric analysis and differential thermal analysis indicates increased residual mass with higher CB content, while Fourier transform infrared spectroscopy shows minimal alteration in the organic constituents post-modification. Flame-retardancy testing demonstrates enhanced flame suppression in CB-modified sponges, with residual char percentages of 26%, 72%, and 85% for the raw sponge, low-CB/sponge, and high-CB/sponge, respectively. Electromagnetic wave absorption performance is evaluated through impedance matching and reflection loss mapping, indicating the optimal thickness for absorption efficiency. Additionally, the high-CB/sponge exhibits promising sensing properties, accurately detecting human motions with high reproducibility and durability. Overall, the study highlights the multifunctional capabilities of CB-modified melamine sponge, making it a promising candidate for various applications requiring flame retardancy, electromagnetic wave absorption, and sensing functionalities.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Daqiang Zhao,Xu Zhou,Tianhao Cui,Gui-Gen Wang
The deposition of Ti 3 C 2 T x nanosheets onto an ultralight melamine sponge (MS) holds great appeal for constructing mechanically robust and high-performance electromagnetic interference (EMI) shielding composites. However, the full potential of Ti 3 C 2 T x materials for shielding performance is impeded by the insufficient affinity between Ti 3 C 2 T x nanosheets and MS. Herein, with the assistance of cellulose nanofibers (CNF), large-sized single-layer Ti 3 C 2 T x nanosheets were firmly attached to the MS skeleton and enveloped the pores. The obtained Ti 3 C 2 T x /MS composite sponges exhibit a unique multi-cavity structure. Moreover, hydrophobic modification was applied to the composites through the use of two-component silane coupling agents. The silane-modified multi-cavity structured composite sponges demonstrate significant enhancements in conductivity, mechanical strength , and environmental stability. Particularly, the incorporation of 17 wt% CNF leads to a 29.3 dB increases in shielding efficiency (SE) for the composite sponge. The enhancement can be attributed to the high reflectance of electromagnetic waves due to the highly conductive Ti 3 C 2 T x /CNF cavity-membranes, the multiple internal reflections within the multi-cavity structure, and the improved interfacial polarization loss capability facilitated by the abundance of MXene-CNF interfaces.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Zhongxiang Bai,Tingdan Deng,Nini Luo,Li Yang,Jingjiang Wei,Pan Wang,Yuanlai Fang,Xulin Yang,Kun Yang,Kun Jia,Qingyuan Wang
Superhydrophobic/superoleophilic sponges with hierarchical biomimetic surfaces hold great potential for application in oil/water separation. However, the process of coupling hierarchical rough structures with hydrophobic chemical groups to fabricate biomimetic superhydrophobic surfaces remains tedious and complicated, making industrial promotion challenging. Herein, we developed an oxidation-mediated kinetic strategy to fabricate a biomimetic interlayer on melamine sponge (MS) skeletons. Initially, the precursor tannic acid-Fe II (TA-Fe II ) complexes were oxidized to interface-active TA-Fe III species. This transformation facilitated the controlled deposition of a biomimetic coating with precise spatial and temporal regulation. Subsequently, octadecylamine modification was employed to impart superhydrophobic properties to the functionalized sponge. Compared with the TA-Fe III mediated hydrophobic sponge by discrete assembly and layer-by-layer self-assembly, the intermediate layer generated by continuous oxidative growth of the TA-Fe II system features a hierarchical spherical rough morphology and demonstrates superior hydrophobicity, achieving a water contact angle of 165°. In addition, the modified sponge exhibits excellent hydrophobic properties in a wide range of application environments, and has excellent oil/water separation performance in both static and dynamic operating environments. It is expected that this simple and effective biomimetic superhydrophobic coating preparation process can provide a reference for applications based on superhydrophobic surfaces.
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高影响因子
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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高影响因子
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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高影响因子
危险品化学品经营许可证（带存储）