ANALYTICA CHIMICA ACTA
·
2016
·
IF 4.712
Shiru Liang,Hongyuan Yan,Jiankun Cao,Yehong Han,Shigang Shen,Ligai Bai
A new molecularly imprinted phloroglucinol–formaldehyde–melamine resin (MIPFMR) was synthesized in a deep eutectic solvent (DES) using phenylephrine as a dummy template. The MIPFMR was used as a solid phase extraction (SPE) sorbent for the selective isolation and recognition of clorprenaline (CLP) and bambuterol (BAM) in urine. Phloroglucinol and melamine were used as double functional monomers that introduced abundant hydrophilic groups (such as hydroxyl groups , imino groups , and ether linkages) into the MIPFMR, making it compatible with aqueous solvents . In addition, the formation of DES by combining the quaternary ammonium salt of choline chloride with ethylene glycol as a hydrogen bond donor was an environmentally safe alternative to toxic organic solvents such as chloroform and dimethylsulfoxide that are typically used in the preparation of most molecularly imprinted polymers (MIPs). Moreover, MIPFMR-based SPE of CLP and BAM in urine resulted in higher recoveries and purer extracts than those obtained by using other SPE materials (e.g., SCX, C 18 , HLB, and non-imprinted phloroglucinol–formaldehyde–melamine resin (NIPFMR)). The optimized MIPFMR–SPE–HPLC–UV method had good linearity (r 2 ≥ 0.9996) ranging from 15.0 to 3000.0 ng mL −1 for CLP and BAM, and the recoveries at three spiked levels ranged from 91.7% to 100.1% with RSDs ≤7.6%. The novel MIPFMR–SPE–HPLC–UV method is simple, selective, and accurate, and can be used for the determination of CLP and BAM in urine samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Muhammad Mubeen,Jingmao Zhao,Mohammad Tabish,Jingbao Wang,Mubashar Mahmood,Hassan Murtaza,Muhammad Jawad,Baomin Fan,Ghulam Yasin
Dual threats of over-film (degradation) and under-film filiform corrosion (FFC) pose a significant challenge to the reliable application of Zn-Al-Mg coated steel (ZAM-steel), necessitating the development of effective protection strategies. This study introduces a novel MRS@GO nanohybrid, integrated within epoxy (EP) coatings, to enhance the corrosion resistance of ZAM-steel in 3.5 wt% NaCl solution. The hierarchical structure of MRS@GO synergistically combines the barrier properties of an insulating material (MRS) with the electrochemical benefits of a conducting material (GO), providing superior protection. This dual functionality significantly improves the overall performance and durability of ZAM-steel, making it a promising candidate as the decorative coating for the automotive industry.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Richuan Rao,Yaohua Huang,Hao Zhang,Chunming Hu,Xiongzi Dong,Weiguang Fang,Qihua Zhou,Zhen Chen,Song Fang,Dongsheng Jin,Xinhao Lv,Baijun Liu,Qiang Ling
A magnetic and mesoporous metal/N-doped carbon composite is prepared using a melamine-assisted pyrolysis method of hydroxypropyl methylcellulose with Fe(NO 3 ) 3 . The magnetic composite has a 3D hierarchical structure composed of 1D nanostructure interlaced with each other and a large pore volume distributed mainly in mesopores. Meanwhile, its N-doped carbon surface with sp 2 hybridized structure is positively charged due to the promotion action of its mixed Fe phase, Fe 3 C and Fe 3 N, inducing the production of electron deficient conjugated structures as electron acceptors. Its characteristic microstructure determines that the adsorption of anionic Congo red on its surface is achieved mainly through multiple adsorption mechanisms of electrostatic and π-π interaction. Thus, the magnetic composite has an excellent dye adsorption capacity, even improved dramatically at high pH conditions, and simultaneously, the spent composite is quickly separated from wastewater solution by using its magnetic properties. In contrast, these undoped or N-doped carbon composites prepared in the absence of melamine and Fe salts have very poor or partially improved adsorption efficiencies to the Congo red dyes due to their inactive characteristic microstructures, such as lower pore volume, more microporous structures and negatively charged mesoporous surface.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 23
·10432-10445
·
IF 2.7
Da Li,Mingxin Feng,Haoran Cai,Yuhong Zhang,Haoxu Yao,Zewu Zhang,Jiehua Bao,Xiaohai Bu,Yuming Zhou
Conventional intumescent flame retardants (IFRs) have demonstrated remarkable efficacy in augmenting flame retardancy but often increase smoke release. To improve the smoke suppression effect of IFRs, this study employed a one-pot method to prepare a loaded core–shell flame retardant material, namely APP@PMA–LDH. This was achieved by supramolecular assembly of phytic acid (PA) and melamine (MA) to form melamine phytate (PMA), which was coated onto ammonium polyphosphate (APP) and loaded with layered double hydroxide (LDH). APP@PMA–LDH was then compounded with a carbonized foam agent (CFA) and polypropylene (PP) to produce PP composite materials. The experimental results showed that the sample containing APP@PMA-LD H1.0 (with 1 wt% LDH) exhibited the highest effects, with a substantial reduction of 68.4% in the peak heat release rate and a 59.5% decrease in total smoke production relative to PP. Furthermore, the sample attained a limiting oxygen index of 30.3% and achieved the UL-94 V-0 rating. The analysis revealed that APP@PMA–LDH promotes the development of a dense and stable graphitic char layer on the surface of PP, reducing internal porosity and effectively hindering the emission of flammable volatile substances, thus increasing the flame retardancy and smoke suppression of PP.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Hui Wang,Mingyu Wang,Jinku Zhang,Di Wu,Zhezhe Qi,Xinbei Dong,Xing Zhang,Hongyuan Yan,Yehong Han
A urea-melamine-hexamethylenetetramine resin (UMHR) was synthesized using water as the reaction medium, with hexamethylenetetramine serving as an environmentally friendly crosslinking agent in place of traditional formaldehyde. The resin was optimized as an efficient solid-phase extraction (SPE) adsorbent through optimization of synthetic parameters. A precise detection method for berberine hydrochloride in Pudilan antiphlogistic oral liquid was established by optimizing extraction parameters. The method exhibited excellent linearity, with a correlation coefficient ( r ≥ 0.9998) over a concentration range of 0.40–100.0 μg/mL. The limits of detection (LOD) and quantitation (LOQ) were 0.094 μg/mL and 0.314 μg/ mL, respectively. Recoveries ranged from 87.9 % to 97.3 %, with relative standard deviations (RSDs) below 3.2 %. This study presents a novel and environmentally friendly analytical approach for the quality control of traditional Chinese medicine preparations.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Baolong Wang,Run Zheng,Kai Shi,Xiangling Ji
Emulsion separation of emulsified oil wastewater has been an urgent problem from both environmental and economic perspectives to be dealt with. Here, to overcome the emulsion separation material-prepared process involving expensive equipment and consuming large energy and the composite component-functionalized running off problem during application, a series of intrinsic-type and hydrophobically functionalized three-dimensional (3D) melamine/polyvinyl-alcohol formaldehyde (MF/PVF-Cn-x) sponges containing interpenetrating polymer networks (IPNs) and a hierarchical porous structure were synthesized by introducing a PVF network into a commercial melamine (MF) sponge by co-acetalation crosslinking reaction first and further acylating chlorination chemical grafting reactions. Water contact angles of as-prepared sponges were higher than 114.7°. Cross-sectional SEM morphological observation and pore size distribution curves demonstrated that interpenetrating polymer networks (IPN) and a hierarchical porous structure were constructed successfully. Their pore size scope was from 1 to 100 μm, and the average pore size was around 20 μm (15.7 and 25.1 μm), which was similar to a stable emulsion droplet size of 20 μm, which satisfied the size sieving requirement for emulsion separation. Compared with the separation performance of 2D membrane materials, MF/PVF-Cn-x 3D hierarchical porous materials exhibited excellent separation performance and antifouling property. Among them, the MF/PVF-C16-46.8% sponge had the most prominent emulsion separation performance with a flux of 9.55 × 104 L m–2 h–1 bar–1 and an efficiency of nearly 100%. Furthermore, the separation flux of MF/PVF-Cn-x was still higher than 2.22 × 104 L m–2 h–1 bar–1 and the efficiency was nearly 100% after seven cycles. On the other hand, the mechanical properties of MF/PVF-Cn-x sponges were strengthened by the introduced PVF network, and their compress stress was higher than 3.2 MPa. All the comprehensive performances made MF/PVF-Cn-x sponges become a suitable candidate as a highly effective emulsion separation material.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yong Zhu,Bingmin Wu,Songyan Xia,Guangzhen Zheng,Juanjuan Cheng,Song Huang,Qingping Xiong,Jing Chen,Hailun Li,Hajime Hirao,Yisheng He,Jihang Chen
The separation and purification of chlorogenic acid (CA) from honeysuckle is a challenging yet significant task in the food industry. Traditional methods, such as precipitation and chromatography methods, often suffer from secondary pollution or low efficiency. This paper proposes a green and efficient adsorption method for separating CA from honeysuckle using melamine–formaldehyde aerogel (MFa) nanomaterial. The synthesis of MFa adsorbent with developed mesoporous material is crucial for achieving high efficiency. The optimal conditions for CA adsorption were determined to be an MFa dose of 0.03 g, a pH value of 3.72, and an adsorption temperature of 18.89 ℃. Under these conditions, a CA adsorption capacity of 151.84 mg/g and an adsorption ratio of 69.58 % were achieved, demonstrating the superior performance of the MFa method. Most notably, the purity of CA improved significantly from 10.50 % to 60.50 %, a marked enhancement improvement over traditional sorption resins. Additionally, the superior antioxidant effect of CA treated with the MFa method was confirmed at both the chemical assay and cytological levels. Affinity analysis and MD simulations revealed that CA adsorption is primarily driven by electrostatic interaction. This study not only addresses current limitations of honeysuckle but also broadens the application pontential of aerogel in food and medicine industries.
✓ 已验证
DOI
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 48
·17995-18002
·
IF 8.307
Lian-Hua Xu,Wen-Ju Wang,Xue-Ji Zhang,Serge Cosnier,Robert S. Marks,Dan Shan
Due to the complexity of the synthetic process of cobalt phosphides (CoP), ongoing efforts concentrate on simplifying the preparation process of CoP. In this work, amino tris(methylene phosphonic acid) (ATMP, L1) and melamine (MA, L2) are assembled into two-dimensional (2D) organic nanostructures by hydrogen bonding and ionic interactions via a supramolecular assembly, which greatly weakens the coordination ability of L1 with Co2+. As the introduced L2 is rich in carbon and nitrogen, it allows the cobalt–organophosphate complex to be placed under a strongly reducing atmosphere during the high-temperature calcination process to achieve an in situ phosphating purpose. The resulting catalyst (N-CoP/NC) exhibits the sought-after enhanced oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) performance. For the ORR in 0.1 M KOH, an enhanced onset potential (0.908 V vs. RHE) and diffusion limiting current (6.280 mA cm−2) can be obtained, which is comparable to those of 20% Pt/C (0.911 V vs. RHE, 5.380 mA cm−2). For the HER in 0.5 M H2SO4, an overpotential of 150 mV is required to drive a current of 10 mA cm−2. Moreover, Density Functional Theory (DFT) calculations reveal the catalytic pathway of N-CoP/NC.
✓ 已验证
DOI
高影响因子
SOLAR ENERGY
·
2020
·
IF 4.608
Jian Liu,Dongjie Wang,Kun Chen,Jingrong Kang,Junliang Yang,Jian Zhang,Hailiang Zhang
The fabrication of high-performance, hole-conductor-free, printable mesoscopic perovskite solar cells (PMPSCs) is still a major challenge because it is difficult to realize the free diffusion of precursors throughout the micrometer-scale porous structure. Here, a facile and efficient additive manufacturing technique is proposed with melamine hydroiodide (MLAI) as an additional material. We systematically investigated the impact of MLAI on the crystallization, morphology, and defects of the perovskite film and the performance of the PMPSCs. The results revealed that the MLAI effectively optimized the morphology of perovskite and improved the pore-filling as well as passivated the defects of the perovskite film, thus hysteresis was reduced and the performance of the devices was enhanced. Based on the addition of MLAI, the power conversion efficiency (PCE) was obtained as 13.86%, which was 18.5% higher than that of the additive-free device. The additive engineering technique exhibits immense potential for large-scale production and application of PMPSCs.
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Huiqi Wang,Huihui Zhang,Shigang Wei,Qiong Jia
In this study, a hybrid composite containing melamine-based covalent organic polymer (MCOP) and ionic liquid (IL) was designed and employed for the functionalization of polymer monolith. The obtained polymer monolithic material was confirmed by scanning electron microscopy, Fourier-transformed infrared spectroscopy, X-ray photoelectron spectroscopy, and thermal gravimetric analysis. A polymer monolith microextraction (PMME) strategy was established based on the monolith for the enrichment of synthetic phenolic antioxidants, exhibiting high sensitivity, good stability and repeatability. Intra-day and inter-day relative standard deviations were both less than 10%. The developed PMME-HPLC method was applied to the preconcentration and determination of synthetic phenolic antioxidants in cosmetic samples and assessed through recovery studies. The developed polymer monolithic material had great potential as a candidate in the preconcentration field for PMME.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 21
·11624-11630
·
IF 7.443
Zhonghua Chen,Jianchuan Wang,Fei Yu,Zhengguo Zhang,Xuenong Gao
A novel kind of graphene oxide-modified poly(melamine-formaldehyde) (PMF) microcapsule containing phase change material (microPCM) n-dodecanol was prepared by in situ polymerization. Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to study the chemical structure of graphene oxide (GO) and microPCMs, respectively. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) were used to investigate the morphology of GO and microPCMs, respectively. The thermal properties of microPCMs were studied by differential scanning calorimetry (DSC), thermal constant analysis (TCA) and thermal cycling tests. The FTIR and XRD results indicate that the phase change material n-dodecanol is encapsulated in the GO/PMF composite shell, and there is no chemical reaction between them. The SEM results show that the prepared GO-modified PMF microPCMs are spherical particles with a smooth surface. The DSC results indicate that the phase change temperature and the latent heat of microPCMs with 1 wt% of GO are 26.40 °C and 125.2 J g−1, respectively. The thermal conductivity of GO/microPCMs with 4 wt% GO increases by 66.29%, compared with that of microPCMs without GO according to the TCA results. Moreover, the thermal cycling tests show that the prepared microPCMs possess a good thermal stability. The GO-modified PMF microPCMs are sure to have great potential applications in thermal energy storage.
✓ 已验证
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Yunyirui Liu,Changhua Li,Rongkai Wu,Jixin Gong,Bihe Yuan
Enhancing flame retardancy and fire-warning capabilities of thermal insulation materials used in building external walls is crucial for ensuring fire safety as well as guarding people's lives and assets. Herein, we have developed an environmentally friendly nano-coating that possesses flame-retardant and early-warning properties by integrating graphene oxide (GO) and attapulgite (ATP) onto melamine foam (MF) through a layer-by-layer self-assembly method (LBL). The GO-ATP-MF composite demonstrates a rapid response to flame (<1 s) due to GO's thermally induced reduction. Additionally, ATP's synergistic flame-retardant effects on both gas and condensed phases contribute to outstanding flame retardancy, enabling an enduring fire alarm duration (>1330 s). The warning duration time of this composite surpasses the majority of GO-based fire-warning nano-coatings reported to date. Moreover, incorporating a Bluetooth wireless transmission system facilitates real-time fire information sharing among smart devices, thereby optimizing fire signal transmission efficiency. Thus, this study advances GO-based flame-retardant nano-coatings and devices with high sensitivity and prolonged fire-warning capabilities, providing an innovative idea to enhance the fire safety of MF as a thermal insulation material.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）