JOURNAL OF SEPARATION SCIENCE
·
2016
·Vol. 39
·期 19
·3775-3781
·
IF 2.741
Xiaoyu Zhao,Ligang Chen
A new magnetic molecularly imprinted polymer was coupled with ultra high performance liquid chromatography and tandem mass spectrometry for the selective determination of melamine in milk powder. The magnetic molecularly imprinted polymer has been prepared by using carbon nanotubes as the matrix, Fe 3 O 4 particles as the magnetic ingredient, melamine as the template molecule, methacrylic acid as the functional monomer, ethylene glycol dimethacrylate as the cross-linker and polyvinylpyrrolidone as the dispersant. The polymer was characterized with scanning electron microscopy, Fourier transform infrared spectroscopy and a physical property measurement system. The isothermal adsorption, kinetics adsorption, and selectivity were studied to evaluate the rebinding properties of the magnetic molecularly imprinted polymer. Various parameters affecting the extraction efficiency such as the amount of polymer, extraction time, and eluting solution were evaluated. The limit of detection was 0.00075 mg/kg. The relative standard deviations of the intraday and interday precision are 0.4–2.7 and 2.3–5.1%, respectively. The proposed method was successfully applied to determine melamine in different milk powder samples from different provenances, and satisfactory recoveries of 89.0–95.6% were obtained. This method has great significance for quality control and is simple and suitable for the rapid determination of melamine in milk powder.
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SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Xiaokang Zhang,Li Zhang,Jing Chen,Xiangzhan Jiang,Yu Wei,Fei Xiao,Jinghui Hu,Jiawang Ding
Facing the escalating issue of industrial wastewater discharge and its profound environmental repercussions, the creation of novel sponge materials that excel in oil-water separation while incorporating flame retardancy becomes critically urgent. Despite their superior absorption capabilities, conventional oil-water separation sponges typically overlook flame retardant features, a limitation that curtails their applicability. To address this gap, we have developed a multifunctional hydrophobic sponge through a sophisticated multi-step chemical self-assembly process. This method grafts 9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and perfluorinated compounds onto melamine foam (MF), yielding a composite material designated as DOPO-PF@MF. DOPO-PF@MF boasts a dual functionality of hydrophobicity and flame retardance. Its modified surface exhibits a pronounced hydrophobic-lipophilic balance, with a static water contact angle of 134°. It also displays favorable wetting characteristics towards various organic solvents, such as methanol, ethanol, dimethylformamide, dichloromethane, and hexane. This material demonstrates an impressive adsorption capacity for these solvents, with the adsorption-desorption capacity for ethanol remaining consistent over ten cycles. Furthermore, DOPO-PF@MF efficiently separates emulsions of methylene chloride and water, showcasing its versatility. Moreover, DOPO-PF@MF exhibits commendable chemical resilience under extreme temperatures, ranging from 0 °C to 100 °C, and withstands both acidic and alkaline conditions (pH 1–14), preserving its structural integrity against corrosive substances. Most notably, it surpasses unmodified melamine foam in flame retardancy. The incorporation of DOPO fortifies the material's resistance to high-temperature ignition, effectively inhibiting flame propagation and reducing burn rate, enhancing safety measures.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Hu Liu,Dong-Hui Yang,Xu-Yun Wang,Jiangwei Zhang,Bao-Hang Han
Exploiting low cost and durable electrocatalysts with high efficiency for oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER) is of great significance for energy conversion and storage applications. Herein, a hybrid electrocatalyst of FeCo alloy nanoparticles embedded in a porous N -doped carbon was prepared via a pyrolysis process of low-cost melamine sponge and mass-produced metal–polyphenol network. Benefting from the metal coordination of metal–polyphenol network and abundant N source of melamine sponge, the metal–N moiety and FeCo alloy nanoparticles (wtih a diameter around 50 nm) encapsulated in a N -doped graphene-like carbon layer were formed in-situ. Such intimate integration of graphene-like carbon-encapsulated FeCo alloys, metal–N active species, and porous structure is conducive to improve the catalytic activity and increase the catalytic durability in alkaline media. As a consequence, the as-prepared electrocatalyst exhibits the pronounced activity toward ORR, OER, and HER simultaneously under alkaline condition, particularly on the performances of potential, stability, and methanol tolerance.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 5
·2701-2711
·
IF 11.301
Sen Meng,Xing Zhao,Chun-Yan Tang,Peng Yu,Rui-Ying Bao,Zheng-Ying Liu,Ming-Bo Yang,Wei Yang
Interfacial solar steam generation has been proved to be effective for desalination and water purification applications and a large number of smartly designed structures have been reported to reduce the heat conduction loss into bulk water by introducing thermally insulating porous foams. Actually, directly using air as the thermal insulation layer should be one of the most efficient ways to reduce the heat loss into bulk water. To this end, we present a bridge-arched hollow and self-floating integrative solar absorber/water evaporator prepared by a one-step hydrothermal reaction. The fully integrative water evaporator can achieve ∼92.9% water evaporation efficiency and 1.476 kg m−2 h−1 water evaporation rate under just 1 sun illumination. Such a high efficiency is caused by the unique bridge-arched raised upper surface, hollow interior, and tailored bilayer structure consisting of hydrophilic porous melamine foam for water transportation and a reduced graphene oxide layer for photothermal conversion. These features not only provide broadband solar absorption (∼95%), efficient light-to-heat conversion and a high water evaporation rate, but also suppress the heat loss at the same time. Owing to the simplicity of fabrication and recyclability, this novel composite structure is an ideal material for commercial, portable solar thermal conversion applications to obtain clean water via seawater desalination and wastewater purification.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Linghao He,Jiameng Liu,Yongkang Liu,Bingbing Cui,Bin Hu,Minghua Wang,Kuan Tian,Yingpan Song,Shide Wu,Zhihong Zhang,Zhikun Peng,Miao Du
An advanced trifunctional electrocatalyst based on a series of composites composed of TiO 2 -encapsulated carbon-nitride (CN x ) (denoted as TiO 2 [email protected] x ) is developed, which is derived from the Ti 3 C 2 T x and melamine–cyanuric acid calcinated at different temperatures. Among the series of TiO 2 [email protected] x nanosheets, the TiO 2 [email protected] x,950 (obtained by calcination at 950 °C) hybrid exhibits robust trifunctional electrocatalytic activity toward the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR) by combining the excellent electrochemical activity of the graphene-like nanostructure and the high electrocatalytic performances of TiO 2 nanoparticles. When TiO 2 [email protected] x,950 is used as the electrocatalyst for water splitting, a current density of 10 mA cm −2 ( E j = 10) is achieved at a low cell voltage of 1.50 V vs. reversible hydrogen electrode. Meanwhile, the overall oxygen activity of the TiO 2 [email protected] x,950 exhibits good reversible oxygen reaction, giving a small potential difference between the E j = 10 for OER and the half-wave potential for ORR (0.75 V). Moreover, a simply equipped Zn-air battery is assembled using a homemade cathode, showing open-circuit potential of 1.344 V, which also can supplied an electrical power and produced H 2 at the cathode and O 2 at the anode. Consequently, this work can pave a path for developing multifunctional electrocatalysts for water spitting and liquid Zn–air battery.
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Journal of Energy Storage
·
2024
·
IF 8.9
Jianfeng Hu,Shenghua Xu,Ye Wang,Xin Lai,Zhengbin Xia,Zhengguo Zhang,Peng Xie,Sixing Zhang
Organic phase change materials pose a risk of flammability in practical applications, and composite materials prepared after encapsulation also face the problem of high thermal resistance when in contact with equipment. In this study, a new type of flexible composite phase change material with flame retardancy and insulation was prepared. Melamine foam (MF) was also physically modified with flexible long-chain polymer polyvinyl alcohol (PVA) to improve tensile property, leading to the preparation of one porous material, denoted as PMF. Subsequently, ammonium polyphosphate (APP), an intumescent flame retardant, was incorporated to formulate the composite phase change material APP/PEG@PMF. The mechanical properties of melamine foam were assessed using the universal material testing machine both before and after modification and the optimal amount of PVA, determined to be 15 %, was selected. The experimental results show that the composite materials have a high latent heat (both higher than 160 J/g). After 100 heating and cooling cycles, the material demonstrates excellent shape stability, proficiently preventing PEG leakage during phase transformation. Additionally, it exhibits prominent shape memory attributes, thereby reducing the contact thermal resistance when integrated within equipment. The oxygen index meter and vertical combustion test show that when the APP content is higher than 10 %, the oxygen index of the composite material reaches 22.6 %, while the thermal conductivity decreases to 0.13 W/(m·K). It not only improves the safety of PCMs in practical application scenarios, but also broadens the potential application spectrum of this composite material within the thermal insulation domain.
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DESALINATION
·
2026
·
IF 9.8
Chen Tan,Jing Miao,Kanghui Liu,Aichun Zhao,Xinlong Guo,Linjie Qin
Developing cost-effective adsorbents capable of treating multipollutant wastewater under fluctuating pH conditions remains a major challenge for layered double hydroxide (LDH)-based materials. Herein, we report a La-doped MgAl-borate LDH/Nitrogen-doped carbon hybrid (LaMgAl-BLDH/NC) constructed through a C-O-M interfacial coupling, in which hydroxyl-rich N-doped carbon reacts with the metal‑oxygen layers of LaMgAl-BLDH to form robust covalent C-O-M linkages. This bonding-directed assembly produces a chemically durable and strongly integrated 3D porous network with enhanced charge heterogeneity and improved resistance to acidic or alkaline corrosion. Benefiting from this strengthened interfacial coupling and the synergistic effects of La incorporation, the LaMgAl-BLDH/NC composite exhibits high removal capacities toward structurally diverse pollutants, achieving maximum capacities of 995.20 mg/g for Congo red, 3020.19 mg/g for malachite green, and 151.34 mg/g for phosphate. Notably, compare with conventional LDHs that undergo structural degradation in acidic or alkaline environments, the C-O-M reinforced hybrid maintains excellent performance over a broad pH range of 4–10. The maximum adsorption capacities of the adsorbent for Congo red, malachite green and phosphate at pH 2, 4 and 12 correspond to 79.65%, 87.32% and 58.83% of those obtained at their respective optimal pH values. Mechanistic analysis reveals that electrostatic interaction, ion exchange, π-π stacking, pore filling jointly govern the removal process. Optimization via Box-Behnken response surface methodology further enhances removal efficiency by identifying favorable synthesis and operational conditions. This work establishes a generalizable, low-cost C-O-M bonding strategy for pH-tolerant LDH/carbon hybrids, enabling efficient remediation of multipollutant industrial wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Le Cheng,Jiachun Feng
With the progress of intelligent electronic equipment, flexible and wearable strain sensors are being widely used in various applications such as electronic skins and smart robot. In this work, we proposed a facile method for the preparation of stretchable strain sensors as well as compressible strain sensors by using commercially available melamine form (MF). Firstly, MF was coated with reduced graphene oxide (rGO) to construct conductive networks via layer-by-layer assembly of polyethyleneimine and graphene oxide followed by chemical reduction. Thermoplastic elastomer poly (styrene- b -ethylene-butylene- b -styrene) (SEBS) was then infused into the MF@rGO scaffolds through solution absorption method. By adjusting the concentration of SEBS solution used, stretchable and compressible strain sensors were fabricated and both of them exhibited excellent mechanical properties, sensitive responsiveness and electromechanical durability. The deformation capacity of these two types of sensors could reach as high as 50% strain and the maximum gauge factors of stretchable and compressible strain sensors was 2.43 and 1.74, respectively. Stable signals during at least 1000 cycles for both stretchable and compressible strain sensors were well maintained. The potential sensing application of real-time monitoring of human motions was also demonstrated.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Huilan Chen,Yunyan Li,Lily Chen Wang,Ziyi Wang,Di Wang,Luping Feng,Shuai Li,Jizhen Shang,Limin Lu,Guojiang Mao,Hua Wang
Mercury (II) ion (Hg 2 + ) as highly toxic heavy metal may be accumulated in aquatic ecosystems and animals species so as to enter human body to conduct health harm. To ensure the safety of fishes food, hence, it is of great interest to evaluate the Hg 2+ levels in different kinds of fishes as well as Hg 2+ removal in aquaculture tailwater. In this article, a selective colormetric detection and efficient removal strategy has been developed for Hg 2+ ions by the controlled supermolecular self-assembly of melamine (MA)-platinum (Pt) composites onto mesoporous Fe 3 O 4 carriers. The resulting Fe 3 O 4 @MA-Pt exhibited the largely enhanced catalysis properties, which might rationally decrease in the presence of Hg 2+ ions through the strong Pt-Hg and MA-Hg interactions. A colorimetric analysis technique based on Fe 3 O 4 @MA-Pt catalysis was thereby designed for detecting Hg 2+ ions with the linear concentrations ranging from 0.010 to 1.0 μM. Moreover, Hg 2+ levels in muscles samples of four kinds of carnivorous and omnivorous fishes were evaluated, displaying an obvious difference in order of snakehead > largemouth bass > crucian carp > silver carp. The data indicate that the carnivorous fishes should possess higher Hg 2+ levels than the omnivorous ones, thus providing a recognizable guidance to the safety evaluation of Hg 2+ in different kinds of fishes. Furthermore, the Fe 3 O 4 @MA-Pt composites with high surface-to-volume ratios were utilized to adsorb Hg 2+ ions in aquaculture tailwater, achieving the adsorption efficiencies up to 99.73 %. Such a colorimetric analysis and removal strategy for Hg 2+ ions may promise for aquatic food safety, clinical diagnostics, environmental monitoring, and tailwater treatments.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 2
·1-9
·
IF 5.705
Zhang Liang,Chen Ligang
A composite ratiometric fluorescent probe is described for visual detection of melamine (MEL) in milk samples. It is based on the use of red emitting and green emitting CdTe quantum dots, and a mesoporous molecularly imprinted polymer. The red emitting QDs are embedded in the silica microsphere to serve as a core, and the green emitting QDs are coated on the surface of the silica microsphere as a shell. A molecularly imprinted polymer (MIP) with specific recognition sites for MEL was placed on the shell. If MEL is bound by the MIP, the green fluorescence is quenched due to hydrogen bond interaction. The red emission, in contrast, remains unchanged. Quenching leads to a change in the color of fluorescence from red-green to purely red. This effect allows for visual and instrumental detection of MEL. The mesoporous structure of the MIP reduces the mass transfer resistance and enhances the accessibility of sites for MEL. Response is linear in the 50–1000 ng mL −1 MEL concentration range, and the limit of detection is 13 ng mL −1 . The fluorescent probe was successfully applied to the analysis of MEL-spiked milk samples and gave recoveries between 94.1 and 98.7%, with 3.6–5.1% relative standard deviations.
Schematic of the preparation and detection of the composite probe. The probe was applied for the selective recognition and visual detection of melamine (MEL).
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Shaodong Sun,Jia Li,Peng Song,Jie Cui,Qing Yang,Xing Zheng,Zhimao Yang,Shuhua Liang
Constructing isotype heterostructure is an effective way to promote the separation of photogenerated charge carriers for graphitic carbon nitride (g-C 3 N 4 ). However, the interface derived from different source precursors is not good enough for the charge separation of g-C 3 N 4 /g-C 3 N 4 isotype heterojunctions , resulting in a limited improvement of photocatalytic performance. Here, we presented a rational design and synthesis of the g-C 3 N 4 (bulk)/g-C 3 N 4 (nanosheet) (denoted as BCN/CNNS) isotype heterojunctions with tight interfaces for enhanced photocatalytic hydrogen evolution . Using glucose-modified melamine as the single-source precursor for the first time, an isotype heterojunction was in situ formed at the interface between bulk g-C 3 N 4 and g-C 3 N 4 nanosheet . Due to the enhanced visible light absorption and promoted charge carrier separation, the in situ formed BCN/CNNS isotype heterojunctions exhibited highly improved photocatalytic hydrogen evolution activity under visible light irradiation, which was 16.4 and 11.5 times than those of the bare BCN and CNNS, respectively. Such an in situ formed isotype heterojunction with tight interfaces originated from the thermal polymerization of single-source glucose-modified melamine would present a new avenue for developing efficient g-C 3 N 4 -based isotype heterojunction photocatalysts.
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ANALYTICAL CHEMISTRY
·
2017
·
IF 6.32
Min Liu,Liyan Zhang,Yue Hua,Luping Feng,Yao Jiang,Xiju Ding,Wei Qi,Hua Wang
Mesoporous silver–melamine (Ag–MA) nanocomposites were synthesized simply by the controlled supermolecular self-assembly process to be modified onto the electrodes for the electroanalysis of multiple sulfides in blood or wastewater. It was discovered that Ag–MA nanocomposites could be prepared with various morphological structures depending on the Ag-to-MA ratios. Furthermore, the electrodes modified with mesoporous Ag–MA nanowires could display stable and sharp electrochemical peaks of solid-state AgCl at a considerably low potential approaching zero, thus circumventing any interference from possibly coexisting electroactive substances in the background. More importantly, the yielded AgCl signals would decrease selectively induced by sulfides through the specific sulfide–chloride replacement reactions toward the transferring of AgCl into non-electroactive Ag2S. The developed electroanalysis strategy could facilitate the selective detection of multiple sulfides (i.e., S2– or H2S, Sx2–, cysteine, and S2O32–) in the complicated media with high-level salts such as blood and wastewater, showing a linear concentration range from 0.50 to 512 μM as exemplified for S2– ions in blood. Such an electroanalysis device equipped with the portable electrochemical transducer can be tailored for the field-deployable monitoring of a variety of sulfides in clinical and environmental analysis fields.
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