Journal of CO2 Utilization
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2022
·
IF 8.321
Chengyuan Duan,Yuming Xie,Meili Ding,Yi Feng,Jianfeng Yao
Integrating dual Lewis acid and base as well as rational hierarchical pore structure in one catalyst is favorable to significantly boost the CO 2 cycloaddition reaction at mild conditions. In this regard, carbonized melamine sponge (CMS) featuring a highly porous network, rich nitrogen doping and excellent photothermal capability is employed as the ideal host for the construction of CMS@MOFs (namely, MIL-88-NH 2 and ZIF-8-NH 2 ) composites with diverse acid-base properties. Results show that all the obtained composites exhibited a satisfactory CO 2 adsorbing capacity (33–54 cm 3 /g) and delivered a remarkable yield of target cyclic carbonate at either mild thermal conditions (0.1 MPa CO 2 and 80 o C) or under light irradiation (light intensity: ~350 mW/cm 2 ) at room temperature. Even with diluted CO 2 (15 vol. % CO 2 ), high yields of 80–82 % are achievable. Moreover, the used catalysts can be easily recycled from reaction systems, leading to a good recyclability .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Yanpeng Chu,Zhongwei Chen,Yuan Yu,Tingting Chen,Zhiquan Chen,Qingwu Zhang,Changxin Li,Haoming Yang,Juncheng Jiang
The high flammability of epoxy resin (EP) greatly limits its application in industrial production. To enhance the fire resistance of EP, a phosphorus-containing melamine cyanurate derivative (P-MCA) flame retardant was synthesized by modifying melamine cyanurate (MCA) with phenylphosphonic dichloride (PPDCl). The structure and properties of P-MCA were comprehensively characterized. The EP composite with 5 wt% of P-MCA (EP/5 P-MCA) exhibited a limiting oxygen index of 29.2% and achieved a V-0 level in UL-94. Compared with EP, the peak heat release rate and peak smoke production rate of EP/5 P-MCA were reduced by 18.8% and 24.2%, respectively. The improved fire resistance of EP/5 P-MCA was attributed to the physical shielding of the carbon layer and the dilution effect of nitrogen-containing gases . Besides, the flexural strength of EP/5 P-MCA was 14.7% higher than that of EP due to the desirable compatibility of P-MCA and EP. Meanwhile, the glass transition temperature (T g ) of EP and the crosslinking density of the rubbery state increased to a certain extent with the addition of P-MCA. In conclusion, P-MCA can simultaneously improve the fire resistance and mechanical properties of EP, indicating great potential for application.
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CHEMOSPHERE
·
2022
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IF 8.943
Hongyuan Wang,Yongli Liu,Yalin Wu,Qingxiang Zhou,Zhi Li,Liushan Jiang,Chunmao Chen
Nitrogen and sulfur element co-decorated carbon nanodots (N,S-CDs) were synthesized by solid state hydrothermal method utilizing mercaptoacetic acid and melamine as the precursors. The obtained N,S-CDs had wonderful optical and chemical stability. The experimental results demonstrated that silver nanoparticles (AgNPs) could noticeably quench the fluorescence of N,S-CDs. The quenching of fluorescence signal from the presence of AgNPs may be attributed to inner filter effect. The crafted nanoprobe for sensing AgNPs was endowed with some specialties such as simplicity, excellent selectivity and sensitivity, environmental friendliness and low cost. The probe exhibited specific linearity from 0.024 to 1.77 nM, and was endowed a good limit of detection down to 0.022 nM. The experimental results demonstrated that the built probe could be an efficient tool for AgNPs detection and had a prospective application, and also provided a new direction for establishing innovative method for determining and monitoring pollutants from nanoparticles.
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PubMed
高影响因子
CHEMOSPHERE
·
2022
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IF 8.943
Lu Zheng,Yifan Gu,Baolv Hua,Jiarui Fu,Fengting Li
Metal-organic frameworks have been investigated in Fenton-like catalysis for tetracycline hydrochloride degradation, a widely used antibiotic which threatens the growth and health of creatures. However, powder phase and absence of large pores limit the materials’ degradation performance and application. In this work, a hierarchical macro-meso-microporous composite melamine sponge@MIL-101-Fe-NH 2 was firstly designed and constructed. While the micropores provided plenty of active sites to generate reactive oxygen species , the macropores and mesopores accelerated mass transfer. Besides, MIL-101-Fe-NH 2 particles dispersed on melamine sponge individually, exposing more catalytic sites and avoiding inactivation caused by aggregation compared to powder catalysts. Its catalysis performance for tetracycline hydrochloride degradation was evaluated through changing various influence factors like H 2 O 2 concentration, catalyst amount, pH and coexisting ions. Different from the preference of homogenous Fenton catalysts for pH 2–4, the composite displayed the most effective degradation at a subacid environment closer to nature with 77.24% in 30 min. Owing to the synergistic effect of hierarchical porous structure and monodispersed nanoparticles , the composite exhibited faster reaction rate and longer persistence compared to powder MIL-101-Fe-NH 2 . Easy recycling and less ion leaching made it advantages for practical application. •OH, •O 2 − and 1 O 2 active species contributed together to the degradation and two main possible degradation pathways were put forward based on 35 detected intermediates.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
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IF 7.312
Sheng Cao,Shao-zhong Hu,Dan Luo,Ting Huang,Nan Zhang,Yan-zhou Lei,Yong Wang
Providing highly efficient and economical adsorbents is the prerequisite for the heavy metal ions removal from wastewater through the adsorption method. Herein, the polydopamine (PDA)-coated melamine foam (MF) skeleton (MF-PDA) was achieved through the bio-inspired functionalization method. The results showed that the smooth surface of MF skeleton was successfully coated by PDA nanoparticles, leading to the changes of surface roughness and chemical features of MF skeleton. Studies on the adsorption behaviors toward highly toxic Cr(Ⅵ) by the MF-PDA samples showed that the MF-PDA samples had the good removal ability and the maximum adsorption capacity was about 240 mg/g at pH value of 2. In addition, the MF-PDA sample also showed high adsorption selectivity, high desorption ability and good reusability. Further analysis found that the coated PDA had a strong reduction effect on Cr(Ⅵ), and about 53.7% toxic Cr(Ⅵ) was reduced to low-toxic Cr(III) during the adsorption. Although PDA decoration method has already been used to assist the secondary modification or to enhance the modification efficiency of the other functionalization method, this work clearly declares that PDA exhibits great role in removing Cr(Ⅵ) and the MF-PDA sample is a promising adsorbent for removing highly toxic Cr(Ⅵ) from sewage.
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FOOD CHEMISTRY
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2021
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IF 7.514
Yingying Sun,Wan Li,Liqing Zhao,Fengyong Li,Yunfei Xie,Weirong Yao,Wenqiu Liu,Zhaosheng Lin
In food safety assessment, surface-enhanced Raman spectroscopy (SERS) is a novel detection method with the advantages of being fast, easy, and of high sensitivity. However, many SERS substrate synthesis methods are complex, and there are only a few studies on the simultaneous detection of multiple substances. In this study, a new, simple, low-cost SERS substrate was synthesised for the first time to simultaneously detect illegal food additives rhodamine B and basic orange II in chilli products. A lightweight, porous, and low-cost material of melamine foam (MF) was employed as the SERS synthesis template. The substrate’s SERS effect on, and sensitivity to, rhodamine B and basic orange II were demonstrated. The molecular vibration and SERS enhancement mechanisms of the two target molecules were analysed by density functional theory (DFT) calculations. The results reveal that this fabricated substrate has great application potential for the supervision and testing industry.
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PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
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2021
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IF 9.078
Hafezeh Nabipour,Xin Wang,Lei Song,Yuan Hu
Organic-inorganic hybrid flame retardant technology integrates independent ingredients into a whole, thus showing advantage of simultaneous improvement in flame retardant, smoke suppressant and mechanical properties of polymers over traditional flame retardants. In this work, a novel organic-inorganic hybrid flame retardant denoted as IR-MOF-3-Mel was synthesized by covalent hybridization of isoreticular metal-organic framework-3 (IR-MOF-3) with melamine. A relatively low amount of IR-MOF-3-Mel nanoparticles dramatically decreased the fire risk of epoxy resin (EP). Specifically, the EP with only 2.0 wt% of IR-MOF-3-Mel achieved a limiting oxygen index (LOI) of 30.5% as well as a UL-94 V-0 classification, whereas its counterpart with 2.0 wt% of IR-MOF-3 showed a LOI of 25.0% and no classification in UL-94 test. Furthermore, the peak heat release rate , total heat release and smoke production rate of the EP with 2.0 wt% of IR-MOF-3-Mel was declined by 74.0%, 71.4% and 35.6%, respectively, compared to neat EP. Additionally, the glass transition temperature , the tensile strength , and the young's modulus were 11 °C, 38%, and 27% higher than those of neat EP, respectively. The flame retardant mechanism analysis clarified that IR-MOF-3-Mel contributed to formation of a char layer with a high level of thermal resistance and graphitization which accounted for significantly reduced fire risks.
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ELECTROCHIMICA ACTA
·
2020
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IF 6.215
Jiaji Yue,Hui Zhang,Yunqiang Zhang,Mei Li,Hui Zhao
Coral-like carbon structures (CCSs) are successfully obtained by calcining the complex of zeolitic imidazolate framework-67 (ZIF-67) and melamine formaldehyde resin at 750 °C. The as-prepared CCSs shows favorable structural advantages for application in supercapacitor electrode materials , including heteroatom doping, large pore volume (0.24 cm 3 /g), high specific surface area (200.63 m 2 /g), and interconnected pathways. Electrochemical measurements show ideal capacitance properties with a high gravimetric specific capacitance of 320 F/g at 1 A/g and excellent rate capability of 236 F/g (74% capacitance retention) at 10 A/g using 2 M H 2 SO 4 as the aqueous electrolyte in a three-electrode test system. Furthermore, the CCSs show excellent cycling stability with 106% capacitive retention after 10000 cycles at 10 A/g. The energy density of 20.5 Wh/kg is also proved with 2 M H 2 SO 4 as the electrolyte at a power density of 900 W/kg. The remarkable electrochemical properties and facile effective fabrication of CCSs point to a feasible and economical approach for the large-scale preparation of outstanding performance supercapacitors .
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POLYMER TESTING
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2020
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IF 3.275
Zaihang Zheng,Chenchen Liao,Yurou Xia,Yuhang Liu,Boya Dai,Anbo Li
In this article, co-microencapsulation technology was utilized for decorating the surface of dialdehyde starch (DAS) and melamine polyphosphate (MPP) via one-step process. The aim for this design was to improve the dispersion for DAS and MPP in polypropylene (PP) and employ DAS as sustainable char-forming agent, which lied in enhancing the flame retardancy of PP. In view of chemical composition , morphology and surface wettability , the changes for DAS and MPP after modification were confirmed by energy dispersive spectrometer (EDS), scanning electron microscope (SEM) and water contact angle (WCA) tests, respectively. Most of all, the results for flame retardant tests demonstrated limiting oxygen index (LOI) value and vertical burning tests (UL-94) rating of PP/30 ph M[M&D] were 28.2% and V-1. Along with the synergistic effect, the homogeneous dispersion of DAS and MPP in PP after co-microencapsulation modification was also one of main reasons for the increased flame retardant properties. Except that, the chemical interaction between DAS and MPP in producing the char layer was also certified by TGA curves. After systematic analysis on char residue, the possible intumescent flame retardant mechanism was primarily proposed.
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ACS Applied Materials & Interfaces
·
2018
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IF 8.097
Sheng Xu,Geyu Lin,Wei Zhao,Qian Wu,Jing Luo,Wei Wei,Xiaoya Liu,Ye Zhu
In this study, molecularly imprinted nanohybrids with “necklace-like” nanostructures were developed based on self-assembled polymeric nanoparticles decorated multiwalled carbon nanotubes (MWCNTs) by employing melamine as template molecules. An amphiphilic copolymer poly(acrylic acid-co-(7-(4-vinylbenzyloxy)-4-methyl coumarin)-co-ethylhexyl acrylate) (poly(AA-co-VMc-co-EHA), PAVE) containing photosensitive coumarin units was synthesized first. Then, the PAVE copolymers were co-assembled with MWCNTs in the presence of template molecules, generating photosensitive molecularly imprinted nanohybrids (MIP-MWCNTs) with necklace-like structures. Subsequently, the MIP-MWCNTs nanohybrids were used to modify electrode surface followed by photo-polymerization of the coumarin units in the nanohybrids, leading to a network architectured complex film. After extracting melamine molecules by electrolysis, a melamine MIP sensor was successfully developed. The as-prepared sensor exhibited a significantly wide linear range (1.0 × 10–12–1.0 × 10–6 mol L–1) and a low detection limit (5.6 × 10–13 mol L–1) for melamine detection. High selectivity of the sensor toward melamine was well demonstrated with respect to other melamine analogues and interferents. Furthermore, the MIP sensor showed high stability and reproducibility. The excellent performance of the MIP sensor can be attributed to the unique nanostructure of the complex film provided by these necklace-like nanohybrids. On the one hand, the nanosized polymeric MIP nanoparticles along the MWCNTs increase the effective electrode surface area and thus offer a high melamine-binding capacity. On the other hand, the MWCNTs in MIP-MWCNTs nanohybrids serve as “electronic bridges” to accelerate the electron transfer among the complex MIP film. More importantly, the MIP sensor was practically used to monitor melamine in milk samples, demonstrating a promising feature for applications in the analysis of food like milk and other food products including milk powder, infant formula, and animal feed. Considering the ease of polymeric nanoparticles functionalization, the necklace-like nanohybrids would be extended to wider applications in many other sensors and devices.
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POLYMER DEGRADATION AND STABILITY
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2023
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IF 5.9
Mengru Liu,Zedong Gong,Guodong Wang,Xiuyu Liu,Yanbei Hou,Gang Tang
The persistent challenge of maintaining fire safety in flame retardant modified rigid polyurethane foams (RPUF) under humid conditions continues to be a concern. To address this challenge, a microcapsule named MF-Co@PAPP has synthesized, composed of melamine resin (MF, shell) and piperazine pyrophosphate (PAPP, core). This microcapsule was developed to enhance the long-lasting flame retardancy and smoke suppression of RPUF. These composites demonstrated a significant reduction in total heat release and total smoke release compared to pure samples, with decreases of 44% and 29%, respectively. The MF-Co@PAPP facilitated the carbonization process of RPUF, leading to the formation of a more stable char layer. The RPUF/MF-Co@PAPP composites exhibited the highest limiting oxygen index values, even after a 14-day immersion in water. This study introduces a target-driven design approach to enhance the fire safety of RPUF, offering inspiration for future development of tailored flame retardants.
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高影响因子
Toxics
·
2023
·Vol. 11
·期 9
·799
·
IF 4.6
Hangwei Wang,Zhanren Liu,Shaojie Liu,Ruoru Yang,Yifei Wang,Yiying Gu,Min Wu,Ruihua Dong,Bo Chen
This study aimed to assess the therapeutic efficacy of catechin against experimentally induced kidney stones resulting from co-exposure to melamine (MEL) and cyanuric acid (CYA) in male Sprague–Dawley rats. To induce nephrolithiasis, a combination of MEL and CYA (1:1 ratio, each at a dose of 31.5 mg/kg bw/day) was administered to the rats for 28 consecutive days. After nephrolithiasis was successfully induced, the rats were randomly divided into two groups: a treatment group and a sham group. The treatment group was given a daily oral dose of 50 mg/kg of catechin for 28 days, while the sham group received no intervention. Urine and blood samples were collected throughout the treatment period, and kidney samples were taken on day 28. Our findings demonstrated that treatment with catechin significantly reduced crystal deposition and pathological damage in the rats from nephrolithiasis. Additionally, renal injury markers were significantly decreased in the treatment group compared to the sham group. These findings suggest that catechin has potential therapeutic benefits in treating nephrolithiasis induced by co-exposure to MEL and CYA.Keywords:melamine;cyanuric acid;nephrolithiasis;catechin
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