JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 16
·51992
·
IF 3.125
Chao Yan,Ye-Jun Luo,Wen-Ge Zhang,Zi-Fan Zhu,Pei-Ying Li,Nian Li,Yu-Fang Chen,Tao Jin
Melamine foam is widely used in daily life and building materials due to its superior flame retardancy properties, thermal insulating effects, smoke suppressive ability, low toxicity, and sound absorption properties. To increase the practicality of melamine foam, most research has focused on extending resin storage duration and preparing low-toxic, high-strength foam. In this study, allyl glycidyl ether was used to modify melamine resin, and the modified resin was able to demonstrate a longer storage duration as compared to the conventional resins, and the storage time for the modified resin has exceeded 90 days, and a low free formaldehyde content (0.05 ppm). Furthermore, the as-prepared foam exhibited excellent flame retardancy properties (limiting oxygen index [LOI] = 38.5%, it could easily pass the UL-94-0 grade), low-volume water absorption (0.94%), and lower thermal conductivity (0.0225 W·m −1 ·K −1 ). Concurrently, the foam prepared based on the optimal conditions possessed a high compressive strength of 5.08 MPa, which was ca. 17.5 times higher than that of the conventional melamine foam. Thus, it is expected that this melamine resin modification approach can provide a new approach for the preparation of high-performing foams.
研究领域:
材料科学
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化学工程
·
高分子科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Yixuan Zhao,Jiahui Zhao,Shuqin Liu,Dunqing Wang,Jian Liu,Fei Zhang,Xiangshu Chen
Melamine (MA) enhanced Cu-Fenton process was developed for the degradation of anthracyclines. Taking daunorubicin (DNR) degradation as an example, we found that the initial first-order apparent constant of Cu 2+ /MA/H 2 O 2 system with a molar ratio of 1:8 for Cu 2+ :MA was 5.2 times higher than that of conventional Cu 2+ /H 2 O 2 system. The in-situ reductive coordination between Cu 2+ and MA facilitated the generation and stabilization of Cu + species, thereby accelerating the rate-limiting step of Cu 2+ /Cu + conversion and maintaining high levels of Cu + during the degradation process. Moreover, pre-synthesized Cu + -MA complexes ( e.g. , CM-250) further enhanced the efficiency of the Cu-Fenton reaction by increasing both the Cu + proportion and MA chelation. The apparent activation energy for DNR degradation in CM-250 mediated Fenton reaction (15.9 kJ mol −1 ) was lower than that in systems involving Cu 2+ /MA (41.2 kJ mol −1 ) and Cu 2+ (65.6 kJ mol −1 ). Enhanced generation of various reactive oxygen species (·OH,·O 2 - , and 1 O 2 ) was confirmed, with 1 O 2 playing a dominant role, significantly improving both degradation rate and mineralization degree for DNR. MA-enhanced Cu-Fenton process also offers a convenient alternative to effectively remove other anthracyclines and organic micropollutants, holding great promise for advancing advanced oxidation processes as well as practical large-scale degradation applications targeting multiple pollutants.
研究领域:
环境科学
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化学
·
生物学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zheng Wang,Yong Fan,Yimin Zhang,Hong Liu,Peng Liu,Qian Wan
In the context of the accelerated development of all-vanadium liquid flow batteries and vanadium-based alloys, there is a growing requirement for high-purity V 2 O 5 . In this study, vanadium shale leachate was used as raw material and V 2 O 5 products with purity >99.9 % were prepared greenly and efficiently through vanadium precipitation by melamine adsorption, and the adsorption conditions and mechanisms were investigated. XPS, FTIR, DFT, and MD results show that the –NH 2 and N atoms on the melamine bind to VO 2 + through coordination, resulting in high adsorption performance. The Langmuir isothermal adsorption model predicted the maximum adsorption capacity of melamine for vanadium to be 892.86 mg/g. Furthermore, the adsorption thermodynamics indicated that the adsorption reaction was heat-absorbing and spontaneous. The pseudo-second-order kinetic model provided a superior description of the adsorption kinetic data at 363 K, and the adsorption process was found to be mainly controlled by the chemical reaction control kinetic model. The reaction conditions were optimized by response surface methodology, and under the optimized conditions, the vanadium precipitation rate was >99 %, the purity of the prepared V 2 O 5 was >99.9 %, and the vanadium precipitation process did not produce ammonia–nitrogen wastewater. The method provides an efficient, economical, and environmentally friendly way for the preparation of high-purity V 2 O 5 .
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
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2020
·
IF 6.306
Shanshan Wu,Zheng-Zhi Yin,Xiaohui Chen,Xueqing Wang,Datong Wu,Yong Kong
Poly(melamine) (PMel) was synthesized via the electropolymerization of melamine monomer, which was then characterized by field-emission scanning electron microscopy (FESEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The possible polymerization mechanisms of melamine were also revealed by FT-IR spectroscopy and UV–Vis spectroscopy. Next, the PMel modified GCE (PMel/GCE) was used for the simultaneous determination of nitrite (NO 2 − ) and tartrazine, and the parameters were optimized. The kinetic study showed that the electrochemical oxidation of nitrite and tartrazine at the surface of PMel/GCE is a typical surface-controlled electrode process. Under the optimun conditions, the developed sensor outperformed those previously reported, and it also exhibited high selectivity and reproducibility. Finally, the PMel/GCE was used for the simultaneous determination of nitrite and tartrazine in foodstuffs, and the results indicated that the proposed sensor could be a promising candidate for accurate determination of nitrite and tartrazine in real food samples.
研究领域:
分析化学
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电化学
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食品科学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 42
·32897-32901
·
IF 3.84
Miaolin Yin,Lifang Zhao,Qin Wei,He Li
A simple, rapid and sensitive detection method by the naked eye for melamine in dairy products is reported. Within 60 min, melamine can be detected as low as 0.4 μM by UV-vis spectrometric or naked eye observation, which is far below the melamine safety limit in the USA and EU.
研究领域:
食品科学
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分析化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Mengmeng Yang,Lixia Yang,Zhaofeng Chen,Yang Ding,Manna Li,Qiong Wu,Tianlong Liu,Lihao Liu
In this work, an environmentally friendly, superhydrophobic and durable modified melamine sponge was fabricated through a simple two-step dipping method. Through this strategy, the active carbon (AC) particles and reduced graphene oxide (rGO) were fixed on the melamine sponge skeleton with polydimethylsiloxane (PDMS) glue to form MS/rGO/AC/PDMS sponge, which has a multi-stage pore structure . Water contact angle (WCA) revealed that the as-prepared sponge possessed excellent water repellency up to 164°. Being applied in the field of oil/water separation, MS/rGO/AC/PDMS exhibited excellent oil-water selectivity, high oil sorption ability up to 120 g/g, and separation efficiency of over 99.85%. It is worth noting that under complex environments such as acid-base, fatigue and abrasion, the obtained sponge can maintain original properties, and the water contact angle exceeds 154°. In addition, it has good mechanical stability which can be reused and recovered continuously, making it a potential material for practical applications.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Hongyu Dong,Yingqing Zhan,Ao Sun,Yiwen Chen,Ximin Chen
Developing the super-wetting sponge materials with high selectivity and multitasking separation performance is essential for treatment of the complicated oily wastewater in harsh environments. However, the practical application was limited due to the poor durability, time-consuming fabrication process, etc. In this work, we reported a facial strategy to fabricate the magnetic super-hydrophobic/super-oleophilic material by anchoring the hydrophobic ferroferric oxide nanoparticle/graphene oxide hybrid onto the melamine sponge. Benefiting from the hierarchically regulated micro-/nano- rough structure and low surface energy, the modified sponge exhibited super-hydrophobicity (CA=163.08 ± 1.2°, OCA=0°) and could resist the high/low temperature, chemical corrosion, and harsh physical damage, which contributed the excellent self-cleaning, recyclability, and selective absorption of various oils (63–156 g/g). More importantly, the modified sponge offered the superior multitasking separation performance, including the magnetically driven absorption of oil/water mixture or emulsion, gravity-driven filtration of oil/water mixture, and continuous oil/water separation (up to 98.96%) in harsh conditions. Therefore, the super-hydrophobic melamine sponge with the multifaceted features is a promising candidate for the purification of marine oil spills and industrial oily wastewater.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Hui Wang,Qi Zhao,Kuikui Zhang,Futao Wang,Jinfang Zhi,Chong-Xin Shan
Fabrication of absorbent materials foroil/water separation is an important ecological pursuit for oil spill clean-up and organic pollutants’ removal. In this study, nanodiamonds (NDs), a promising member of the carbon family, were functionally modified by the covalent linking of octadecylamine (ODA). Subsequently, the superhydrophobic sponge with hierarchical microstructures was fabricated by embedding ND-ODA into a melamine sponge (MS) skeleton via a simple immersion-drying process. The as-prepared sponge (ND-ODA@PDMS@MS) showed superhydrophobic properties with a water contact angle of 155 ± 2°. For various oils and organic solvents, ND-ODA@PDMS@MS possesses excellent absorption capacity (26.65–55.64 g/g) and oil/water separation efficiency (above 98.6%). Furthermore, the adsorption capacity to crude oil remained relatively stable in highly acidic, alkaline, and salty conditions, ensuring the application in the clean-up of industrial oily sewages and marine oil spills. Besides absorbing oil for a single time, ND-ODA@PDMS@MS also exhibited satisfactory performance in continuous oil/water separation. Therefore, this work provides a facile strategy to produce robust and efficient absorbent materials for oil/water separation in large-scale oil and organic solvent clean-ups.
研究领域:
材料科学
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环境工程
·
化学工程
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产品关联
DOI
PubMed
高影响因子
APPLIED SPECTROSCOPY
·
2021
·
IF 2.388
Xiaolin Li,Chaoqun Ma,Lei Li,Hui Gao,Jiao Gu,Chun Zhu,Yamin Wu,Senqi Guo,Yitao Wei,Guoyu Wang,Zirui Wang,Guoqing Chen
Melamine has been illegally adulterated in dairy food because of the rich nitrogen content and stable chemical properties in recent years. Therefore, the detection of melamine is of great significance for food safety supervision and human health protection. As melamine is a weak fluorescent substance, it is difficult to detect melamine directly by fluorescence spectroscopy. In this work, we found that melamine can significantly enhance the emission of the tetracycline–europium (EuTC) complex at 616 nm. Therefore, we took EuTC complex as a fluorescent probe to detect melamine. According to the characterizations of absorption spectra, molecular electrostatic potential distribution, and the time-resolved spectra, we speculated that tetracycline and melamine may form a complex through hydrogen bonding interaction in the melamine-EuTC reaction system, causing the melamine closer approach to Eu3+ and reducing the non-radiative energy loss of water molecules to Eu3+, which significantly enhanced the fluorescence intensity of EuTC. The fluorescence intensity of EuTC complex with melamine concentration in the range of 0.5–40.0 μM shows a good linear relationship, and the correlation coefficient is 0.9951 with the detection limit of 7.85 × 10−8 M. It shows a high sensitivity for the EuTC complex as a fluorescent probe to detect melamine, which provides a supplement and extension for the detection of melamine by fluorescence spectroscopy.
研究领域:
食品安全
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分析化学
·
生物传感
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DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Zhe Ji,Wen Chen,Er Wang,Rongriu Deng
A new method for the determination of melamine (MEL) indirectly by the changes of differential pulse voltammetry (DPV) current of K 3 [Fe(CN) 6 ] probes after 10 min incubation (∆I) has been established. It’s based on the inhibitory effect of MEL on occupying the molecular recognition sites of surface of the electropolymerized molecular imprinting & graphene modified glassy carbon electrode (MIPPy/GR/GCE). The MIPPy/GR/GCE was characterized by cyclic voltammetry (CV), electrochemical impedance spectrometry (EIS) and scanning electron microscopy (SEM). The ∆I is linearly proportional to the negative logarithmic concentration of MEL over the range of 3.0×10 -8 ~1.0×10 -4 mol•L -1 (R = 0.9948), the detection limit is 1.02×10 -8 mol•L -1 (S/N =3). The recoveries of samples are from102.65% to 108.02%, the result is satisfactory when it is used to analyze the real samples.
研究领域:
分析化学
·
食品科学
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DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 8
·086103
·
IF 1.449
Jianxin Chen,Minghuang Jiang,Jian Han,Kaili Liu,Mengling Liu,Qing Wu
Melamine formaldehyde resin based on graphene oxide (GO@MF) was successfully prepared, then, Fe3O4 was introduced to synthesis a magnetic composite, which used for the adsorption of anionic dyes. The Fe3O4/GO@MF was characterized by SEM, FTIR, XRD and VSM. Adsorption behaviors affected by concentration, contact time, pH and ionic strength of the as-prepared composites for Congo red (CR) and methyl blue (MB) were systematically explored and discussed. The equilibrium adsorption data of CR and MB accorded better with the Langmuir model and the Freundlich model, respectively, while there kinetics adsorption data both fitted the pseudo-second-order model. The kinetic and equilibrium parameters were also calculated. The maximum adsorption capacities calculated by Langmuir model of CR and MB were 257.07 mg g−1, 418.41 mg g−1, respectively and the equilibrium adsorption capacities calculated by pseudo-second order were basically same to the experimental results. The adsorption capacities of CR and MB affected by the pH were significant which may due to the protonation or deprotonation of amino and secondary amino groups. In addition, the introduction of Fe3O4 into GO@MF composited endued it with excellent magnetic separation property. Fe3O4/GO@MF exhibited well adsorption selectivity on anionic acid dyes and stabilized regeneration performance.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2018
·Vol. 56
·期 7
·789-796
·
IF 2.588
Yan Xiao,Jiaxiao Zhang,Meidong Lang
Water-soluble supramolecular polymers, especially made up of biomolecules, are ideally suited to build new biomaterials that can mimic or interact with dynamic, biological environments. Here, two derivatives from thymine (T), that is N -[2-(3,4-Dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)acetyl]-L-phenylalanine (T-phe) and N -(2-Aminoethyl)-3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidineacetamide (T-NH 2 ) were synthesized. Then the optimal condition for self-assembly of T-phe and T-NH 2 driven by melamine (M) was explored. It was observed that M/T kept at 1:3 with equivalent T-phe and T-NH 2 under neutral environment resulted in long fibers (>1 μm) with extremely high aspect ratios, which suggested that electrostatic and π -stacking interactions could be effectively orchestrated by hydrogen bonds to direct the hierarchical assembly. Furthermore, hydrogels were spontaneously generated with a concentrated solution of T-phe, T-NH 2 , and M due to the fibril entanglement. Given its biomimetic nature and efficient self-assembly process, this newly developed supramolecular polymer stacked by tetrameric structures represented an innovative concept and pathway for novel bio-inspired materials. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56 , 789–796
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高影响因子
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