DYES AND PIGMENTS
·
2014
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IF 3.468
Xianyi Cao,Fei Shen,Minwei Zhang,Jiajia Guo,Yeli Luo,Jingyue Xu,Ying Li,Chunyan Sun
A rapid, convenient and highly sensitive method for melamine detection was presented based on fluorescence resonance energy transfer between rhodamine B and citrate-stabilized gold nanoparticles . Rhodamine B could be electrostatically adsorbed to the surface of gold nanoparticles and the fluorescence emission of rhodamine B was quenched. Upon addition of melamine, the decreased fluorescence emission recovered, since melamine could induce the aggregation of gold nanoparticles and release the adsorbed rhodamine B. Under the optimal conditions, the fluorescence recovery efficiency was linearly proportional to melamine concentration in the range of 5–1000 μg L −1 . The detection limit was 0.18 μg L −1 , which was greatly lower than the safety limits required in China. The method was successfully applied for melamine detection in milk and powdered infant formula. Many advantages were exhibited by the system such as facile material synthesis, ease of operation, rapid analysis and competitive analytical performance.
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APPLIED SURFACE SCIENCE
·
2015
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IF 2.711
Ming Wu,Jun-Min Yan,Xue-wei Zhang,Ming Zhao
The g -C 3 N 4 is synthesized by directly heating the acetic acid treatment melamine. A combination of XRD, SEM, TEM, PL and UV–vis are utilized to characterize the composition, morphology and optical properties of g -C 3 N 4 . This method synthesized g -C 3 N 4 shows smaller particles and some holes which high up the photocatalytic activity compared with the bulk g -C 3 N 4 .
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Environmental Science-Water Research & Technology
·
2024
·
IF 3.5
Haoxiang Yan,Jianzheng Zhen,Yuyuan Yao
Developing a facile preparation method to construct separable and recyclable Fenton-like catalysts holds great significance in the field of environmental remediation. Herein, a rapid dopamine (DA) polymerization strategy to modify melamine foam (MF) was proposed for the construction of bulk foam catalytic materials, which was further utilized for peroxymonosulfate (PMS) activation to degrade organic pollutants. Taking advantage of the chelation between dopamine's catechol group and Fe3+, as well as the oxidative environment provided by H2O2, DA could encapsulate and polymerize on the surface of MF within 2 h to obtain the MF@Fe@PDA catalyst. Detailed experimental results demonstrated that MF@Fe@PDA could efficiently activate PMS to achieve almost 100% removal of bisphenol A (BPA) in 20 min, and the corresponding turnover frequency (TOF) value was one order of magnitude higher than that of the homogeneous (Fe2+, Fe3+) and nanoparticle (Fe0) catalysts. The high activity of the MF@Fe@PDA/PMS system stemmed from the Fe sites and carbonyl group (CO), which could induce the activation of PMS for the rapid generation of singlet oxygen (1O2), sulfate radical (SO4˙−) and hydroxyl radicals (˙OH). Meanwhile, the coexisting bicarbonate ions (HCO3−) in the MF@Fe@PDA/PMS system could enhance the generation of 1O2, thereby accelerating the degradation of BPA. Moreover, a flow-through system assisted by the bulk MF@Fe@PDA catalyst was constructed for organic pollutant degradation. Overall, these findings may open up new possibilities for developing highly efficient catalysts for wastewater remediation.
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International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 3
·556-565
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IF 7.2
Tian Konghu,Yang Hang,Zhang Chao,Shu Ruiwen,Shao Qun,Liu Xiaowei,Gao Kaipeng
Carbon-based foams with a three-dimensional structure can serve as a lightweight template for the rational design and controllable preparation of metal oxide/carbon-based composite microwave absorption materials. In this study, a flake-like nickel cobaltate/reduced graphene oxide/melamine-derived carbon foam (FNC/RGO/MDCF) was successfully fabricated through a combination of solvothermal treatment and high-temperature pyrolysis. Results indicated that RGO was evenly distributed in the MDCF skeleton, providing effective support for the load growth of FNC on its surface. Sample S3, the FNC/RGO/MDCF composite prepared by solvothermal method for 16 h, exhibited a minimum reflection loss (RL min ) of −66.44 dB at a thickness of 2.29 mm. When the thickness was reduced to 1.50 mm, the optimal effective absorption bandwidth was 3.84 GHz. Analysis of the absorption mechanism of FNC/RGO/MDCF revealed that its excellent absorption performance was primarily attributed to the combined effects of conduction loss, multiple reflection, scattering, interface polarization, and dipole polarization.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2024
·Vol. 39
·期 5
·1223-1228
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IF 1.3
Cao Lijiu,Zhang Jiyao,Wang Xinqi,Zhang Xinhe,Huang Jian,Chen Yufang,Jin Tao
Through exploring the effects of low pH on the composite system of desulfurization gypsum (DG) enhanced by melamine-formaldehyde resin (MF), it is found that the inducing of sulfate-ion, in contrast to chloride and oxalate ions, favors the longitudinal growth of the crystalline form of the hydration product, which was relatively simple and had the highest length to width ( L / D ) ratio. At the same time, MF can also improve L / D ratio of gypsum hydration products, which favors the formation of hydrated whiskers. Finally, in a composite system composed of hemihydrate gypsum, MF, and glass fibers, when dilute sulfuric acid was used to regulate pH=3–4, the tight binding formed among the components of the composite system compared to pH=5–6. The hydration product of gypsum adheres tightly to glass fiber surface and produces a good cross-linking and binding effect with MF. The flexural strength, compressive strength, elastic modulus, and water absorption of the desulphurized gypsum composite board is 22.7 MPa, 39.8 MPa, 5 608 MPa, and 1.8%, respectively.
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INORGANIC CHEMISTRY
·
2024
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IF 4.3
Ya-Lan Deng,Chun-Li Hu,Jiang-Gao Mao
The π-conjugated [C3H6+xN6]x+ (x = 0–3) cations are good functional groups, which are widely employed in the preparations of nonlinear optical (NLO) and birefringent materials due to their high hyperpolarizability and optical anisotropy. In this paper, the first melamine hydroxyborate [C3H7N6]3[B3O5(OH)2] (MelBO-I) was synthesized by the boric acid melting method under the molar ratio of H3BO3:C3H6N6 = 1:1. MelBO-I (P21/c) exhibits a two-dimensional (2D) {[C3H7N6]3[B3O5(OH)2]}∞ layer composed of [C3H7N6]+ cations and [B3O5(OH)2]3– anions interconnected via hydrogen bonds. MelBO-I exhibits significant birefringence (Δn = 0.286@546 nm). Under the molar ratio of H3BO3/C3H6N6 = 3:1, [C3H8N6]4[B12O19(OH)6] (MelBO-II) was isolated. In MelBO-II (P21), highly polymerized [B12O19(OH)6]8– groups form a 3D network through hydrogen bonding, featuring 1D tunnels of 8-membered and 16-membered rings filled by [C3H8N6]2+ cations. MelBO-II is the first noncentrosymmetric (NCS) bifunctional melamine borate with a moderate SHG response (0.4 × KDP) and large birefringence (Δn = 0.285@546 nm). The results indicate that incorporating [C3H6+xN6]x+ (x = 0–3) cations into borate can effectively induce birefringence. A high concentration of boric acid promotes the formation of large boric acid cluster anions and facilitates the transformation from the CS to NCS structure.
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PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
·
2025
·
IF 3.2
Zhang Xu,Peng Xiaoqian,Liu Shaojun,Liu Xiaochan,Liu Guoran,Liu Rongshuang,Niu Jiale,Yuan Zhipeng,Zhang Jing,Yi Xibin,Filatov Serguei
A current challenge for natural gas adsorbed storage technology is to find specialized adsorbent materials that are able to store and deliver large amounts of methane (CH 4 ) near room temperature and at low pressures. In this study, bimetallic MOFs is supported on nitrogen-doped carbon foam derived from melamine (MC@NZn) by vacuum impregnation process as an adsorbent for CH 4 storage. The nitrogen-doped carbon foam with macroporous internetwork combined with high surface area and micro-/mesoporous structure of the NiZn-MOF leads a hierarchical porous structure, which provides efficient and rapid pathways for the penetration of CH 4 molecules and more active sites for CH 4 adsorption. Experimental results show that MC@NZ4 exhibits a CH 4 adsorption capacity of 105.80 cm 3 ·g -1 under 298 K and 60 bar with isosteric heat of adsorption of 10.71 kJ·mol -1 . Furthermore, MC@NZ4 achieves a CH 4 /N 2 adsorption selectivity of 5.63, indicating its potential for CH 4 adsorption. This work provides a simple method to combine MOF powders with three-dimensional skeleton substrate material to fabricate monolithic solid porous materials, which can find potential applications in gas adsorption.
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TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Qingyao Li,Qiang Gao,Wenhao Chen,Wenpeng Wang,Zixiang Wu,Zhuopei Zhang,Youqiang Wang,Yange Feng,Daoai Wang,Feng Zhou
Currently, the conductive grease has problems such as unstable conductivity and large wear volume. This article used an in-situ synthesis method to synthesize a base conductive grease with PAO 10 as base oil, oleic acid and melamine as thickener. The complex conductive grease was further prepared by doping MWCNTs-OH into the base conductive grease. The experiment found that the complex conductive grease's anti-wear and anti-friction properties improved by 72.23% and 27.16%, respectively, with respect to the current-carrying condition. The contact resistance is 27.12% lower than commercially available conductive grease. This method of reducing the contact resistance (ECR) and friction coefficient (COF) of conductive grease through hydrogen bonding shows excellent application prospects in the current-carrying friction direction.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Enyuan Hu,Yingwen Zhu,Haiyun Li,Cheng Deng,Bo Cui,Lei Zhao,Jinhui Wu,Xinmiao Wang,Mengfu Zhu
Noise pollution has been recognized as having negative impacts on human psychological and physiological health. Common porous sound-absorbing materials are often limited by low sound absorption coefficient (SAC), excessive thickness, and poor moisture resistance or mechanical properties. Herein, poly(urethane-imide) and melamine foam (MF) were successfully combined for the first time using hydrothermal synthesis and ambient drying to fabricate a poly(urethane-imide)/melamine (PUI/MA) aerogel with a multi-stage pore structure and a core–shell framework. The introduction of PUI reduces pore size and increases tortuosity, thereby enhancing thermal and viscous losses of sound waves. Compared to unmodified MF, the noise reduction coefficient of PUI/MA aerogel achieves an 80 % improvement. Furthermore, numerical microstructural modeling calculations show that the JCA model’s predictions are more consistent with the SACs of PUI/MA aerogels. In addition to significantly improving SAC, the core–shell structure endows the composite aerogels with a compressive Young’s modulus up to 30 times that of MF, a water contact angle over 120°, and a thermal conductivity of less than 60 mW/m/K at 150 °C. The facile and cost-effective fabrication process, superior broadband sound absorption, and excellent fundamental properties suggest that PUI/MA aerogel is a promising candidate for noise mitigation in residential, rail transport, and industrial applications.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2025
·
IF 8.9
Weiwen Gu,Rui Wang,Huaibo Qian,Jingyu Zhang,Jiang Jing,Hongfei Li,Xiaoyu Gu,Sheng Zhang
This study reports our recent effort to address the key challenges of hydrophilicity and inefficiency for conventional intumescent flame retardants (IFRs) through the regulation of interaction modes. Three interaction modes are designed through physical blending (DPAPI/MP, astatic binding), core–shell structure (DPAPI@MP, weak chemical interaction), and covalent bonding (DPAPI-MP, strong chemical interaction). The effect of different interaction modes between piperazine diphosphate (DPAPI) and melamine phosphate (MP) on flame retardancy is analyzed. The introduction of only 20 wt% DPAPI-MP into the PP matrix significantly enhances its flame retardant properties, raising the limiting oxygen index (LOI) increase from 17.2 % to 27.8 % and achieving a UL-94 V-0 rating. The peak heat release rate (PHRR) and total smoke release (TSR) decreased by 79 % and 54 %, respectively. The residual char increases to 29.4 % from 0. The flame retardant mechanism involves a topological rearrangement of the triazine ring, which releases non-combustible gases, while acidic compounds facilitate the development of a three-dimensional P-O-C cross-linked structure. For water-resistant performance the PP/DPAPI-MP/RDP cretained the UL-94 V-0 rating even after 168 h of hydrothermal aging at 70 °C. The precipitation rate is reduced to 1.18 wt%, and the tensile strength decreases by only 1.5 %. The PP/DPAPI-MP/RDP exhibit an excellent balance between flame retardancy and water resistance. This study proposes a novel design concept for regulating the interaction modes of flame retardants, offering new insights into the development of water resistant and flame retardant PP.
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DESALINATION
·
2024
·
IF 8.3
Yichi Liu,Yi Liu,Wenjing Chen,Xiaowu Hu,Yinshui He,Yan Ma,Yuqiong Xie,Wenxing Luo,Lixiang Luo,Lan Jiang,Xiongxin Jiang,Qinglin Li
CdS has been shown to be an excellent photon trap with strong absorption of light at visible and near-infrared wavelengths. The use of CdS for phase change material (PCM) modification can significantly improve its photothermal conversion performance. However, due to the unique energy band structure of CdS, the difficulty in electron conduction leads to poor thermal conductivity . This problem can be improved by introducing high thermal conductivity nanometals for modification, however, the effective combination of CdS and nanometals has been challenging. In this study, a new preparation strategy is demonstrated, in which Ag nanoparticles (NPs) with similar lattice parameters and crystalline coordination to CdS is first introduced on the surface of carbonized melamine foam (CMF), followed by the introduction of CdS NPs. This similar structure helps to form a better interfacial bond between CdS and Ag. The resulting stabilized structure enables the composite phase change material (CPCM) to achieve 96.1 % PEG loading with an ultra-high photothermal conversion efficiency of 94.6 %, thermal conductivity of 0.61 W/m∙K, and excellent antimicrobial activity. This study provides valuable guidance for the engineering design of CPCM with high photothermal conversion performance and suggests its practical application value in seawater evaporation and thermal management of medical devices .
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Lin Gu,Shuhai Ding,Junyu Zhang,Guangxin Yang,Longlong Wang,Xiaoshen Shen,Liangliang Tian,Cong Kong
Antibiotic contamination in environmental waters often occurs at low residue levels, necessitating pre-analysis concentration. To address this, we synthesized a hydrophilic molecularly imprinted resin (MIR) using melamine, urea, and formaldehyde as monomers, with oxytetracycline as the template molecule. Enhanced adsorption efficiency was achieved by doping the resin with Cu 2+ , which forms stable complexes with oxytetracycline. This Cu 2+ -doped MIR (Cu-MIR) was employed as a selective adsorbent in solid-phase extraction (SPE) to enrich four tetracycline antibiotics (TCs) from aqueous solutions. The optimized parameters for Cu-MIR in environmental water sample analysis resulted in linear detection ranges from 0.20 to 40 ng/mL, recoveries between 80.2 % to 102.4 %, relative standard deviations ≤ 9.0 %, a detection limit of 0.1 ng/mL, and the enrichment factors were between 4.79–5.13, as determined by HPLC-MS. Given its diverse adsorption mechanisms and specificity, Cu-MIR shows promise for practical applications in real-world sample analysis.
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