JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 141
·期 2
·e54779
·
IF 3
Jinhan Lu,Xuan Sun,Gaëlle Fontaine,Serge Bourbigot,Zhilin Chen,Maohai Wang,Peng Jiang
An intumescent-flame-retardant vinyl acetate–ethylene copolymer (IFR/VAE) compound has been prepared by blending with a complex of melamine amino trimethyl phosphate (M-AT) and sodium lignosulfonate (SL). Then, this obtained IFR/VAE polymer was applied as adhesives for producing the flame-retardant plywood. The IFR VAE sample (VAE/M-AT3/SL1) with a mass ratio 3:1 (M-AT to SL) showed an enhanced amount of char residue, limiting oxygen index (LOI) value and tensile strength value to 20.6 wt%, 32 vol% and 19.3 MPa, which have been increased by 796%, 600%, and 56% compared to that of neat VAE. The cone calorimeter result showed that the peak of heat release rate (pHRR) of VAE/M-AT3/SL1 sample was reduced by 48% compared to the control one. Additionally, the second peak of HRR of sample IFRPW/15 L/15 (containing 15 wt% M-AT3/SL1 in the plywood adhesive layer) presented a reduction of 29% compared to that of the sample PW/15 L (neat plywood). It is assigned to the formation of phospho-carbonaceous structure during combustion, thus the flame-retardancy of plywood has been greatly enhanced. Thus, this work provides an economical and applicable fire-retardant VAE adhesive formula for producing plywood materials with good performances.
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Journal of Cleaner Production
·
2023
·
IF 11.1
Wei Li,Yue-Lei Hao,Wei-Liang Jin,Jing-Qi Liu,An-Na Tang,Li-Na Zhu,Hong-Xin Jiang,De-Ming Kong
The assessment and treatment of heavy metal pollution are eternal subjects of environmental protection. Facile on-site assessment of heavy metal pollution and efficient, rapid removal of pollutes are still challenging. Covalent organic frameworks (COFs) hold great promise as absorbents for heavy metal pollution treatment. To overcome the application limits of COF powders, a COF-based monolithic composite is prepared by direct in-situ growth of an N/O-rich COF on the surface of a melamine foam (MF). The resultant MF@COF inherits the macro-porous channels of MF, the good crystallinity of COF, and integrates the attractive features of monolithic materials such as ease of operation, facile and highly efficient recovery, and good reusability . The abundant N/O groups endow MF@COF with powerful capture capability towards various heavy metal ions . Its maximum adsorption capacity for Cd 2+ is 278.45 mg/g, and the adsorption equilibrium can be reached within 1–3 s. The adsorption kinetic of Cd 2+ by MF@COF follows the pseudo-second-order kinetic model , and the adsorption isotherm conforms to Freundlich model. Rapid adsorption, together with the easy-to-operate feature of monolithic material, make the ultrafast water purification possible. Meanwhile, MF@COF works well for the highly efficient enrichment of Cd 2+ to realize the naked-eye detection of Cd 2+ pollution at low levels, thus may be developed as an important tool for both on-site assessment and rapid treatment of heavy metal pollution.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Zejun Zhang,Yang Liu,Yuxin Zhu,Juan Zhou,Lisi Wang,Lina Zeng,Lin Li,Shuhai He,Wei Sun
A novel electrochemical sensor based on shrimp shell-derived porous carbon (SSPC) and Cu-melamine (Cu-Me) metal-organic frameworks composite modified electrode was proposed for sensitive determination of hydroquinone (HQ). The SSPC has the enlarged active surface area, the increased conductivity, and the loading ability of Cu-Me. Attributed to these impressive features, the detection signals of HQ is greatly amplified on the SSPC/Cu-Me modified glassy carbon electrode (GCE). Under the optimized conditions, the current response of HQ on SSPC/Cu-Me/GCE is linear in the range of 5.0-1800.0 μmol/L with detection limit down to 1.83 μmol/L (3ϭ). The SSPC/Cu-Me/GCE exhibited excellent selectivity, stability, and reproducibility, which was utilized to detect HQ successfully in lake water sample with satisfactory recoveries. This work is expected to attract greater attention to biomass/MOF composites for electrochemical sensing.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 19
·6336-6346
·
IF 6.4
Dong Guo,Chen Chen,Yongqiang Wang,Youke Wang,Conglu Zhang
Two dimensional materials show unique advantages in catalysis. In this work, it was found that melamine could induce the directional growth of cobalt-based catalysts to form an ultra-thin two-dimensional hexagonal nanosheet structure with only 1.5 nm. In addition, these hexagonal nanosheets (HNs) could grow into a microporous structure under high temperature conditions, and the finally formed CoO hexagonal porous nanosheets (HPNs) had a surface area 11.3 times that of the nanoparticles. Embedding 1.25 wt% of monoatomic ruthenium in the CoO HPNs (CoO/Ru1.25% HPNs) allowed the catalyst to have more active charge storage and transfer centers. The results showed that the overpotential of CoO/Ru1.25% HPNs was 64 mV lower than that of CoO nanoparticles at 10 mA cm−2. The Tafel slope of CoO/Ru1.25% HPNs was only half that of CoO nanoparticles, indicating that a small amount of Ru dispersion and the two-dimensional structure control significantly increased the kinetic rate in the oxygen evolution reaction. The DFT results showed that the Ru single atoms in CoO/Ru HPNs (111) possessed the lowest energy barrier (1.19 eV). The Ru single atoms could effectively reconstruct the neighboring localized structure in the formation of ˙OOH, which desirably decreased the free energy of the system.
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Journal of Cleaner Production
·
2019
·
IF 6.395
Yujie Wang,Anwei Chen,Min Peng,Di Tan,Xiaohui Liu,Cui Shang,Si Luo,Liang Peng
Oil spills result in severe environmental pollution and inflict serious ecological damage, which makes the development of facile, low-cost, high-capacity, and sustainable oil absorbents to be a task of high practical significance. In this study, a kaolin-modified hydrophobic melamine sponge (K-MS) was prepared via simple soaking method, which can be applied to clean up oil spills and organic solvents leaks. The properties of the K-MS were characterized by a range of instrumental techniques. The addition of fluorizated kaolin not only endowed commercially available melamine sponge hydrophobic properties and enhanced its adsorption capacity to various oils and organic solvents. The K-MS exhibited the high adsorption capacity (up to 87–194 g/g) and excellent recyclability (>90%). The equilibrium adsorption time was fast within 1 s for diesel . Moreover, the as-prepared sponge adsorption performance was examined in harsh environment, which has remarkable chemical stability and compressive properties. Thus, this study presents a low-cost facile strategy to produce promising absorbent for large-scale oil and organic solvents cleanups and recovery. Furthermore, this approach can be extended to a series of clay minerals in rich source, thus could open up new prospects for design hydrophobic materials to address oil pollution.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2019
·
IF 2.722
Dan Tang,Yefeng Chen,Mengyun Yin,Qin Yang,Yafen Zhou,Limei Zhou
Since doping has a good effect on improving the photocatalytic performance of carbon nitride (CN), the doping scheme has been extensively studied. In this work, a melamine derivative (2, 4-diamino-6-phenoxy-[1, 3, 5]-triazine, MA-phO) was synthesized and used as a new doping molecule to prepare the modified-CN materials by a facile supramolecular self-assembly method with melamine (MA) and cyanuric acid (CA). The “growth stoppers” effect caused by the doping molecule MA-phO in the supramolecular complex made the modified-CN materials more favorable for forming nanostructure and increasing the specific surface areas. The decomposition of phenyl group allowed C atoms to be incorporated into the CN skeleton which facilitated the separation of photogenerated h + /e − pairs. What's more, the addition of MA-phO could regulate the energy band structure of modified-CN materials. It has been found that the amount of doping molecule affected the photocatalytic performance of photocatalyst. Especially when the doping amount reached 0.5%, the prepared sample had the best photocatalytic activity for the organic pollutants. Significantly, design and synthesis of new melamine derivatives as doping molecules and pretreatment by using supramolecular self-assembly strategy may provide a facile approach for the preparation of tunable morphology, energy band structure and heteroatom-doped g-C 3 N 4 .
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2017
·
IF 4.873
Fubin Luo,Kun Wu,Shan Wang,Mangeng Lu
Melamine resin/graphite nanoflakes hybrids (MGNH) were synthesized by in situ polymerization. The SEM and TEM demonstrate that melamine resin was self-deposited on the surface of the flakes. MGNH is uniform sheeted hybrids which exhibits excellent dispersiveness. MGNH/epoxy composite (MGNH/EP) is prepared via vacuum-assisted method. The special prepared method endows MGNH/EP with interesting anisotropic thermal conductivity . The coefficient of thermal conductivity of the composite in normal direction is 0.4024 W m −1 K −1 , while that of MGNH/EP in horizontal direction is 1.5596 W m −1 K −1 . The optical microscope image of the composite suggests that the nanoflake is arranged as a parallel conduction medium, it is demonstrated that direct flake-flake conduction can form heat-transfer passages, which contributes to the higher thermal conductivity of the composite in horizontal direction. Also, MGNH/EP shows excellent flame retardant properties, evidenced by the dramatically reduced peak heat release rate and 51% of total heat release values compared with neat EP obtained from a microcombustion calorimeter . The reduced fire hazard can mainly attributed to the synergistic effects of melamine resin and graphite nanoflakes.
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MATERIALS LETTERS
·
2025
·
IF 2.7
Yuyan Li,Lijie Zhang,Zhikang Rong,Zhigang Jia
Organic contaminant has detrimental influence on aquatic life and humankind through water circulation. In this work, Ag coated melamine sponge (Ag-P@MS) has been successfully prepared by facile, one-step and in-situ deposition method with the assistance of polyvinyl alcohol (PVA). Methylene blue and congo red as the representative of dyes and 4-nitrophenol as the typical of nitrophenol contaminants are employed to evaluate the catalytic performance of the as-prepared Ag-P@MS. The as-prepared MS composite (Ag-P@MS(6.5)) in the nearly neutral condition demonstrates better catalytic property than that of Ag-P@MS(10.5), and the apparent rate constants for Ag-P@MS(6.5) degradation of MB, CR and 4-NP are 0.01356 s −1 , 0.00886 s −1 and 0.00465 s −1 , respectively. The present work presents a novel approach for the preparation of Ag carrying monolith catalysts based melamine sponge and the potential practical application prospect due to their excellent catalytic performance for organic pollutant.
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RSC Advances
·
2024
·Vol. 14
·期 20
·14041-14050
·
IF 3.9
Dongbo Xi,Ruipeng Chen,Shuyue Ren,Zhenhong Jia,Zhixian Gao
In the present study, we address the limitations of conventional surface-enhanced Raman scattering (SERS) techniques for sensitive and stable detection of melamine in food products, especially dairy. To overcome these challenges, we developed a novel SERS-active substrate by incorporating gold nanoparticles (AuNPs) onto carboxyl-functionalized two-dimensional (2D) MXene material doped with nitrides, specifically Au–Ti2N–COOH. Our strategy leverages the unique physicochemical properties of MXene, a class of atomically thin, 2D transition metal carbides/nitrides, with tunable surface functionalities. By modifying the MXene surface with AuNPs and introducing carboxyl groups (–COOH), we successfully enhanced the interaction between the substrate and melamine molecules. The carboxyl groups form hydrogen bonds with the amino groups on the melamine's triazine ring, facilitating the adsorption of melamine molecules within the ‘hotspot’ regions responsible for SERS signal amplification. A series of characterization methods were used to confirm the successful synthesis of Au–Ti2N–COOH composites.Using Au–Ti2N–COOH as the SERS substrate, we detected melamine in spiked dairy product samples with significantly enhanced sensitivity and stability compared to nitride-doped MXene alone. The detection limit in liquid milk stands at 3.7008 μg kg−1, with spike recovery rates ranging from 99.84% to 107.55% and an approximate RSD of 5%. This work demonstrates the effectiveness of our approach in designing a label-free, rapid, and robust SERS platform for the accurate quantitation of melamine contamination in food, thereby mitigating health risks associated with melamine adulteration.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Ting Wang,Jin Xu,Ying-jiao Zhan,Lei He,Zhi-Cheng Fu,Jin-Ni Deng,Wen-Li An,Hai-Bo Zhao,Ming-Jun Chen
Atmospheric drying method for fabricating aerogels is considered the most promising way for casting aerogels on a large scale. However, the organic solvent exchange, remaining environmental pollution risk, is a crucial step in mitigating the impact of surface tension during the atmospheric drying process, especially for wet gel formed through the alkoxy-derived sol-gel process, such as melamine-formaldehyde resin (MF) aerogel. Herein, a tough polymer-assisted in situ polymerization was proposed to fabricate MF resin aerogel with a combination of mechanical toughness and strength , enabling it to withstand the capillary force during water evaporation. The monolithic MF resin aerogel through the sol-gel method can be directly prepared without additional network strengthening or organic solvent exchange. The resulting MF resin aerogel exhibits a homogeneous as well as hierarchical structure with macropores and mesopores (~6 μm and ~5 nm), high compressive modulus of 31.8 MPa, self-extinguishing property, and high-temperature thermal insulation with 97 % heat decrease for butane flame combustion. This work presents a straightforward and environmentally friendly method for fabricating MF resin aerogels with nanostructures and excellent performance in open conditions, exhibiting various applications.
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Polymers
·
2024
·Vol. 16
·期 11
·1557
·
IF 4.7
An Wei,Shunxiang Wang,Yongjin Zou,Cuili Xiang,Fen Xu,Lixian Sun
To broaden the applications of wood, it is necessary to prepare flame-retardant coatings that can protect wood substrates during combustion. In this study, a bio-based, intumescent, flame-retardant phytic acid–melamine polyelectrolyte (PM) was prepared using phosphorus-rich biomass phytic acid and nitrogen-rich melamine as raw materials through an ion crosslinking reaction. Subsequently, a series of bio-based, flame-retardant wood coatings were prepared by optimizing the structure of urea–formaldehyde resin with the addition of melamine, sodium lignosulfonate, and PM as a flame-retardant curing agent. Woods coated with PM-containing coatings displayed significantly improved flame-retardant performances in comparison to uncoated woods. For PM-cured woods, the measured values of total heat release and total smoke production were 91.51% and 57.80% lower, respectively, compared with those of uncoated wood. Furthermore, the fire growth index decreased by 97.32%, indicating a lower fire hazard. This increase in flame retardancy and smoke suppression performance is due to the dense expanded carbon layer formed during the combustion of the coating, which isolates oxygen and heat. In addition, the mechanical properties of the flame-retardant coatings cured with PM are similar to those cured with a commercial curing agent, NH4Cl. In addition, the prepared flame-retardant coating can also stain the wood. This study proves the excellent flame-retarding and curing effect of ammonium phytate in urea–formaldehyde resin coatings and provides a new approach for the application of bio-based flame retardants in wood coatings.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Lianyong Wu,Yuyan Li,Zhigang Jia,Lixin Xu,Guanghong Sheng,Ran Wei,Kairan Ye
In the work, the functionalized melamine sponge has been successfully prepared by an in-situ solid esterification reaction of poly (vinyl alcohol) (PVA) and citric acid (CA) monomers. The esterification products were evenly coated onto the surface of the sponge framework of the melamine sponge (MS) by the mild heat treatment. Characterization results showed that the as-prepared PVA/CA@MS was provided with a rich hydroxyl group and carboxyl groups due to the as-formed cross-linked hydrogel and the suspending carboxyl group derived from the citric acid monomer. Therefore, the as-prepared 3D PVA/CA@MS was employed as the specific adsorbent to remove cationic dyes due to its oxygen-containing group. The adsorption performance of 3D PVA/CA@MS for cationic methylene blue and methyl violet was systemically carried out by kinetic and isothermal adsorption investigation. The data analyses suggested that the adsorption for PVA/CA@MS for MB and MV followed Langmuir isotherm adsorption and the maximum experimental adsorption capacities were 137.6 and 262.5 mg•g −1 , respectively. The pseudo-second-order adsorption kinetic model fitted well with the experimental data of the time-dependent adsorption process. Mechanistic studies indicated that the electrostatic interaction was the main driving force for the adsorption of cationic dyes. These results demonstrated that the as-fabricated 3D PVA/CA@MS with easy separation performance was an efficient adsorbent for the selective removal of cationic dyes.
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危险品化学品经营许可证（带存储）