SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Jie Zhao,Zhefeng Fan
Melamine (MA)-passivated Mn-doped ZnS quantum dots (QDs) were synthesized by a hydrothermal method . The MA-passivated QDs can form a charge-transfer complex with picric acid (PA) at 80 °C, thereby quenching the phosphorescence of the QDs. A sensitive method for detecting PA was established based on this principle of phosphorescence quenching . When the PA concentration ranged from 2.0 to 180 ng mL −1 , the concentration was linearly related to the quenching intensity of the QDs, with a detection limit of 1.4 ng mL −1 . When applied to detect PA in environmental water samples, the proposed method showed superior analytical performance compared with other PA analysis methods. Furthermore, we verified the static quenching mechanism by density functional theory . MA on the surface of QDs and PA formed a stable structure with a binding energy of 12.43 eV.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2026
·Vol. 37
·期 6
·e70651
·
IF 3.8
Weijiang Huang,Jie Zhang,Ping Yang,Jinghan Hu,Chunyun Tu,Wentao He,Qin Tian,Kui Wang,Xiaolu Xu,Wei Yan
A novel P–N–Si coflame retardant comprising bio-based phytic acid/melamine–coated SiO 2 (PM@SiO 2 ) was designed. The effects of a combination of a 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-derived compound (PN-DOPO) with PM@SiO 2 on the flame retardancy and thermal decomposition of WPU were investigated. Compared with pure WPU, the WPU/PN-DOPO/PM@SiO 2 composites possessing different PM@SiO 2 addition amounts demonstrated enhanced flame retardancy. The addition of 5 wt% PM@SiO 2 and 9 wt% PN-DOPO increased the limiting oxygen index (LOI) of pure WPU from 19.0% to 29.4%, and the resulting material achieved a V-0 rating in the UL-94 test. Furthermore, the peak heat release rate (pHRR), total heat release (THR), and fire growth index of WPU/9%PN-DOPO/5%PM@SiO 2 considerably decreased by 36.1%, 29.1%, and 41.9%, respectively. The excellent flame retardancy is attributed to the ability of PM@SiO 2 to effectively repair defects in the char layer formed by the gas-phase PN-DOPO flame retardant via its silica-cross-linked network. Moreover, the initial thermal decomposition temperature of WPU/9%PN-DOPO/5%PM@SiO 2 increased from 229.6°C to 260.1°C. Moreover, the tensile strength and storage modulus were considerably enhanced. This study presents a new research paradigm for developing environmentally friendly flame-retardant WPUs based on green and synergistic multimechanistic strategies.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·124687
·
IF 7.5
Xiaoli Ren,Zhiqiang Xu,Jingyi Zeng,Ming Liu,Fangfei Li
Layered BiOBr is promising for environmental catalysis but suffers from limited visible-light utilization and rapid charge-carrier recombination. Here, a nested-crucible melamine-assisted thermal activation strategy was developed to regulate the defect and phase structure of BiOBr-based materials while avoiding direct contact between melamine and BiOBr. The melamine-derived atmosphere introduced defect-related states, including possible oxygen-vacancy-related species, and induced minor bromine-deficient phase evolution. These changes enhanced light absorption, charge-separation behavior, and local piezoelectric response, whereas excessive melamine caused severe debromination and Bi 2 O 3 formation. The optimized M-BOB-5 achieved an H 2 O 2 yield of 1772.6 μmol g −1 within 120 min under piezo-photocatalytic conditions, which was 1.8 and 6.9 times those obtained under piezocatalysis and photocatalysis alone, respectively, together with nearly 99% TCH removal within 60 min. The improved performance may originate from defect- and phase-related electronic modulation combined with ultrasound-induced piezoelectric polarization, which facilitates charge separation, O 2 reduction to H 2 O 2 , and pollutant oxidation. This study provides a practical melamine-assisted thermal strategy for regulating the defect and phase structures of BiOBr-based piezo-photocatalytic materials.
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POLYMER DEGRADATION AND STABILITY
·
2026
·
IF 8.1
Fengqing Chen,Yan Feng,Jiahao Shen,Jiawei Ye,Teng Huang,Shuoshuo Xue,Qiao Kang,Dan Xie,Baiyu Jiang,Chunde Jin,Jinfeng Dai
As a key engineering adhesive for wood architecture and interior finishes, melamine-formaldehyde resin (MF) is critically constrained by intrinsic brittleness, insufficient hydrophobicity, and limited long-term flame-retardant efficiency. Herein, this study successfully engineered a category of multifunctional MF (PMF) via in-situ co-polymerization of a novel amino-grafted polyborosiloxane (N-PBS). The obtained PMF integrates B-O linkages and the robust siloxane skeleton into the rigid MF network, exhibiting excellent material processability, characterized by a light color, transparency, good storage stability, and suitable viscosity. Crucially, the incorporation of N-PBS improved fire resistance of PMF, as manifested by significantly enhanced thermal stability. For PMF containing 15 wt% N-PBS (15 %-PMF), the residual char yield was elevated from 19.7 % to 23.9 % due to the synergistic effect of boron and silicon in promoting the rapid formation of a dense, protective char layer. This structural defense extended the burn-through time of 15 %-PMF decorative panel by 64.6 s, and suppressed the total smoke production (TSP) and total heat release (THR) by 82.1 % and 5.9 %, respectively, compared to pure MF. Importantly, the intrinsically flexible siloxane backbone and its low surface energy significantly enhanced the mechanical and interfacial properties. The PMF with 10 wt % N-PBS (10 %-PMF) was considered mechanically optimal, yielding a 20.0 % increase in flexibility (verified by 4.8 mm curling radius) with 7.0 % and 16.0 % enhancements in dry and wet bonding strengths, respectively. The surface robustness was significantly enhanced, evidenced by a 14.6° increase in water contact angle with a 26.4 % enhancement, the cigarette burn resistance and surface water vapor resistance both of 4 level. The designed multifunctional engineering PMF in our work holds great promise as an advanced, high-performance composite for sustainable and functional flame-retardant interior finishes.
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ACS Applied Nano Materials
·
2026
·
IF 5.8
Shuilai Qiu,Wanting Song,Guohua Luan,Bin Zou,Xiaochuan Li,Fei Ren,Yifan Gan,Jingyao Xu,Xiaodong Qian,Yuan Hu
Abstract To address the low adsorption efficiency for high-viscosity crude oil and the flammability of adsorbents in marine oil spill treatment, a nanoengineered multifunctional titanium nitride/black phosphorus−polydopamine−melamine sponge (TiN/BP-PDA/MS) with photothermal, flame-retardant, and superhydrophobic properties was fabricated via a simple dip-coating method. Polydopamine (PDA) served as an adhesive layer, while black phosphorus (BP) and titanium nitride (TiN) provided synergistic photothermal conversion and flame retardancy. The results demonstrate that the composite sponge possesses a stable micro−nano rough structure with a water contact angle of 155°, exhibiting excellent superhydrophobic−oleophilic properties and achieving adsorption capacities of 631−1055 kg/m3 for various oils and organic solvents. Under 1.0 kW/m2 illumination, the BP/TiN synergy enabled rapid heating to reduce crude oil viscosity and enhance adsorption efficiency. Cone calorimetry showed that peak heat release rate and total heat release were reduced by 68.7% and 59.8%, respectively, with significant suppression of smoke and CO/CO2 emissions. The flame-retardant mechanism involves gas-phase radical trapping by BP-derived phosphorus radicals and condensed-phase char barrier formation by PDA, TiN, and PDMS. This work achieves synergistic integration of photothermal conversion, adsorption, and flame retardancy, offering a strategy for emergency marine oil spill remediation.
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AIP Advances
·
2021
·Vol. 11
·期 12
·
IF 1.548
Zhang Jie,Zhang Han,Wang Xuanyao,Zhang Min
The application of flame retardants in automobiles is extensive, and the existing flame retardants will cause some pollution to the environment. Therefore, environmentally friendly flame retardants need wide exploration. Natural fibers have been used in various fields for their environmentally friendly features. Thus, in this paper, hemp fiber (HF) was modified with phytic acid and then combined with melamine cyanurate to improve the fire safety of unsaturated polyester resins (UPRs). The fire behavior and thermal stability of UPR composites were evaluated using the limiting oxygen index (LOI), cone calorimeter test, and thermo-gravimetric analysis (TGA). With 3 wt. % modified HF (HF-P) incorporation, the LOI value of UPR/HF-P-3 composites increased from 18.9% of pure UPR to 22.1%, and the average heat release rate (AHRR) and total heat release were reduced to 401.9 kW/m 2 and 150.6 MJ/m 2 , respectively. TGA revealed that UPR/HF-P-3 composites led to the increased amount of residual char and better thermal stability compared to UPR/HF composites. In addition, HF-P endowed a better enhancement on the flexural strength of UPR composites.
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ACS Omega
·
2021
·
IF 3.512
Xuexia Liu,Juan Wang,Yinfeng Wang,Chunfang Huang,Zhijun Wang,Limin Liu
A simple and green colorimetric sensing assay strategy for highly efficient determination of melamine has been fabricated, which is based on the redox reaction of gallic acid with Ag+. Monodispersed Ag nanoparticles (AgNPs) were obtained using gallic acid as a reducing and stabilizing agent. However, the aggregate behavior of AgNPs was observed, while the melamine was present in the reaction medium. As a result, the color of the solution changed from vivid yellow to brown, and the density of the color was quantitatively correlated with the melamine concentration. The aggregation of AgNPs could be attributable to the formation of hydrogen bonds between melamine and gallic acid. The designed sensor exhibited a good detection limit of 0.099 μM (0.012 ppm), which was much lower than the safety limit in China (1.0 ppm) and EU (2.0 ppm). Additionally, the sensing assay displayed good selectivity toward melamine over other coexisting substances. Consequently, the proposed colorimetric sensor was successfully used for the determination of melamine detection in raw milk samples.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xufei Li,Baoyou Yan,Weiqiu Huang,Hui Bian,Xinya Wang,Jiahui Zhu,Shaocan Dong,Yuyu Wang,Weihua Chen
To overcome the shortage of conventional synthetic methods, such as long reaction time at high temperature and pressure (HTP) or poor performance at room temperature and pressure (RTP), a facile and economical strategy was employed to prepare high-performance ZIF-90 for the first time at RTP only by adding triethylamine (TEA). Herein, we successfully prepared ZIF-90 nanocrystals by a two-step stirring method within several minutes (5–30 min) and their structure parameters (e.g., BET surface areas, 916–1235 m 2 ·g −1 ) were also tuned simultaneously, which were much better than reported samples prepared at RTP. Afterwards, by changing functional ligands, hydrophobic ZIF-90-CF 3 with low surface energy was also designed. With the ligand side of aldehyde (–CHO) and trifluoromethyl (-CF 3 ) groups on ZIF-90 and ZIF-90-CF 3 , the water vapor uptakes and adsorption heats decreased from 7.9 to 0.79 mmol·g −1 and 20.6 to 2.6 kJ·mmol −1 , respectively. Additionally, a shaped ZIF-90-CF 3 /melamine foam (MF) composite with both hydrophobic and oleophilic properties exhibited extraordinary organic compounds (OCs)-water separation ability, including a high adsorption capacity (40.1–108.7 g‧g −1 ) towards various OCs. Furthermore, owing to its excellent compressibility and mechanical stability, the ZIF-90-CF 3 /MF composite can be regenerated by slightly squeezing the adsorbed OCs, indicating the potential for possible commercialisation of the derived MOF/MF composites for the efficient purification of wastewater.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 35
·50826
·
IF 3.125
Yujiao Liu,Ben Niu,Rixin Qi,Yuheng Zhang,Yunqiang Zhang,Mei Li
A simple and efficient approach derived from melamine formaldehyde (MF) resin was explored to synthesize porous thick plate-like carbon (TPC) using poly(vinyl alcohol) (PVA) as reagent and dispersant. Ultra-large lateral dimension of over 100–150 μm is achieved with high nitrogen (12.4 at%)/oxygen (10.8 at%) content after MF prolysis at 700°C. The introduction of PVA provides abundant micro and mesopores inside TPC and the folded layered structure increases the specific surface area both of which are beneficial to improve the electrochemical properties of the electrode. The optimized TPC (MTPC-0.2) shows remarkable rate capability as the current densities increased from 0.5 A/g (409.3 F/g) to 20 A/g (330.0 F/g). Further, the all-solid-state supercapacitors built from two identical MTPC-0.2 electrodes delivers dramatically improved volumetric specific capacitance (8.6 F/cm 3 at 1.2 mA/cm 2 ) and volumetric energy density (1.20 at 21.42 mW/cm 3 ) based on the total volume of device.
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COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Min Sang,Yuxuan Wu,Shuai Liu,Linfeng Bai,Sheng Wang,Wanquan Jiang,Xinglong Gong,Shouhu Xuan
With the development of electronic devices, human beings are always disturbed by the widespread electromagnetic radiation. Meanwhile, the impact kinetic energy from external object will also cause injuries to precision electronic instrument itself and human body. Herein, a lightweight and flexible Melamine Sponge/MXene/Polyborosiloxane (MSMP) hybrid structure with both anti-impacting and electromagnetic shielding performance is proposed by incorporating conductive Ti 3 C 2 T X and polyborosiloxane (PBS) into porous melamine sponge (MS). The nanocomposite shows outstanding energy dissipation ability which can efficaciously degrade the external impact force due to the shear stiffening characteristic. Meanwhile, the nanocomposite presents an excellent electromagnetic interference (EMI) shielding ability with a maximum SE T value of 39 dB. Besides, the MSMP displays obvious adhesion property after being cut due to the viscoelastic property and internal supramolecular network of PBS, thus can repeatedly resist the external damage. Finally, a safety sports protective equipment is developed by integrating the MSMP nanocomposite into the common sportswear . Owing to the good integration of safe-guarding performance and EMI shielding properties, the MSMP nanocomposites show high prospective potential in precision electronic instruments and wearable protective equipment.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Huan Liu,Shuai Li,Luping Feng,Yue Hua,Yuanyuan Cai,Mengyuan Yin,Yuqi Wan,Hua Wang
Mesoporous silver-melamine (Ag-MA) nanocomposites were synthesized by controlled supramolecular self-assembly with various structural morphologies. It was discovered that the rod-like Ag-MA nanocomposites could present the larger Hg 2+ -enhanced catalysis by forming Ag-Hg alloys. Also, they could display large surface-to-volume area and high aqueous stability for the selective Hg 2+ enrichment and absorption of Hg 2+ ions by yielding the stable coordination complexes. A catalysis-based colorimetric method was thus developed using 96-wells plates to probe Hg 2+ ions in blood and wastewater with the linear Hg 2+ concentrations ranging from 1.0 nM to 600 nM and 0.50 nM to 700 nM, respectively. Besides, mesoporous Ag-MA absorbents could facilitate the removal of Hg 2+ ions in wastewater with the removal efficiency up to 99.76 % and the absorption capacity of 598.99 mg g −1 .
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 50
·108774-108782
·
IF 5.8
Xu Jinjie,Li Yongli,Yu Lihong,Pang Yuehong,Shen Xiaofang,Liu Jun
In this work, metal–organic frameworks (MOFs) including Fe-MIL-101 and Ti-MIL-125 were prepared and fixed on the melamine foam (MF) by polyvinylidene fluoride (PVDF) to prepare MF/PVDF/MOFs, which was used as adsorbents in pipette-tip solid-phase extraction (PT-SPE) for rapid extraction of organophosphorus pesticides (OPPs). Then, a gas chromatograph-flame thermionic detector (GC-FTD) was used for simultaneous analysis of Dimethoate (DMT), Iprobenfos (IBF), Parathion-methyl (PAM), and Chlorpyrifos (CPF). The morphology, crystal structure, and functional groups of MF/PVDF/MOFs were characterized, indicating that Ti-MIL-125 and Fe-MIL-101 were successfully synthesized and distributed on MF. The Fe-MIL-101 and Ti-MIL-125 showed good extraction ability for OPPs, which was mainly due to the π-π interaction and the multiple porous structures. Under the optimal conditions, the limit of detection (LODs) of four OPPs was 0.03–0.14 μg L −1 and the RSDs were less than 9.9%. The developed PT-SPE method showed a short extraction time (<3 min). The recoveries in fruits and vegetables (Celery, cabbages, and oranges) ranged from 75.3%–118.8% (RSDs<9.6%). The prepared MF/PVDF/MOFs demonstrated the efficient extraction performance of OPPs, contributing to the rapid pretreatment of OPPs from food and the environment.
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