LANGMUIR
·
2020
·
IF 3.557
Xiaoxu Dong,Mei Cui,Renliang Huang,Rongxin Su,Wei Qi,Zhimin He
A superhydrophobic and superoleophilic porous composite was successfully prepared via a polydopamine-assisted surface coating of MIL-53(Fe) and 1-dodecanethiol (DDT) on a melamine formaldehyde (MF) sponge. The as-prepared sponge composite (MIL-DDT@MF) has a high water contact angle (WCA) of 151.8°, which is probably attributed to both the rough surface derived from in situ growth of MIL-53 nanocrystals and the low surface energy due to grafting of hydrophobic 1-dodecanethiol. The MIL-DDT@MF sponge can effectively absorb oil or organic solvent with an absorption capacity of up to 54.1 (for petroleum) to 120.2 (for chloroform) times its own weight. In addition, the MIL-DDT@MF sponge retained a high absorption capacity and maintained approximately 78% of its original value after 50 cycles of reuse. Moreover, the MIL-DDT@MF sponge can selectively absorb the oil/organic solvent from water and achieve continuous oil–water separation. The separation efficiency of n-hexane, dichloromethane, and crude oil from water or seawater can reach above 95%. The superhydrophobic and superoleophilic MIL-DDT@MF sponge has potential as a promising absorbent for treatment of oily wastewater.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Wen-Xiong Li,Hai-Jun Zhang,Xiao-Ping Hu,Wen-Xue Yang,Zhou Cheng,Chang-Qiong Xie
The intumescent flame retardant (IFR) with ammonium polyphosphate (APP) as the main component has many defects in practical applications, more than that, APP can be traced to non-renewable phosphate rock resources. For the foregoing reasons, the melamine phytate supramolecular nanosheet flame retardant incorporating manganese ion (PAMA-Mn) was successfully prepared with a facile and environmental friendly hydrothermal procedure based on renewable bio-based material phytic acid (PA). The flame retardant polypropylene composite (PPI) with 13.5 wt% APP and 4.5 wt% pentaerythritol (PER) failed to the UL-94 test, and its limiting oxygen index (LOI) value was only 26.5%. After 33 wt% of APP was replaced by PAMA-Mn, the PPMn33 incorporating only 18 wt% flame retardant additives passed the UL-94 V-0 rating, and its LOI value was increased to 31.9%. Compared with PP, pHRR and pSPR values of PPMn33 were reduced by 56% and 23%, respectively. The fire retardant mechanism of PPMn33 was thoroughly discussed via a variety of characterization methods. It was found that the peak of the Gram-Schmidt curve of PPMn33 was drastically reduced by 49% relative to that of PPI, indicating a remarkably decrease of combustible volatile products owing to the incorporation of PAMA-Mn, thereby rapidly reducing the fire hazard risk.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Meishuang Zhou,Juanjuan Yin,Xiaoru Zhao,Yunzhi Fu,Xin Jin,Xiujuan Liu,Tifeng Jiao
Small-sized gold nanoparticles (AuNPs) were prepared in the extract of Sargassum carpophyllum which had protective and reductive effects. The method is green, clean, and simple. The Gold nanoparticles prepared by using Sargassum carpophyllum extract (SAuNPs) have good biocompatibility and are suitable for biosensors, tumor hyperthermia and food safety testing. The aim of this work is to explore a green way to prepare the wine red nanoparticles without any adapters and to detect melamine (Mel) visually in real milk samples. The precursor of AuNPs used was HAuCl 4 . In the visual detection of melamine, the results showed that the color of SAuNPs changed from wine red to purple and then to blue black with the increase of melamine concentration. Meanwhile, UV–vis analysis showed that when the concentration of melamine was in the range of 1.8–2.6 μM, the absorbance ratio (A 650 /A 520 ) was positively correlated with the concentration of melamine (R 2 = 0.998), and the detection limit was 1.82 μM. This method has been successfully applied to the determination of Mel in milk samples with satisfactory results.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yi Liu,Shuangjiang Li,Ying Chen,Tianding Hu,Manoj Pudukudy,Lan Shi,Shaoyun Shan,Yunfei Zhi
The chemical conversion of carbon dioxide (CO 2 ) into highly value-added products not only alleviates the environmental issues caused by global warming but also makes an impact on economic benefits in the world. The synthesis of cyclic carbonates by the cycloaddition of CO 2 with epoxides is one of the most attractive methods for CO 2 conversion. However, the development of green and highly efficient heterogeneous catalysts is considered to be a great challenge in catalysis. In this work, alkenyl-modified melamine-based porous organic polymer (MPOP-4A) was firstly synthesized by a one-pot polycondensation method, and it was again modified with imidazolium-based ionic liquids to obtain final modified catalyst (MPOP-4A-IL). Various analytical techniques were used to confirm structure and chemical composition of the prepared materials. The MPOP-4A-IL catalyst synthesized by the post-modification strategy with imidazolium-based ionic liquids exhibited enhanced catalytic activity for CO 2 cycloaddition reaction. The enhanced catalytic performance could be attributed to the presence of abundant active sites in their structure such as hydrogen bond donors (HBD), nitrogen (N) sites, and nucleophilic groups for an effective chemical reaction. The MPOP-4A-IL catalyst was found to be metal-free, easy to recycle and reuse, and has good versatility for a series of different epoxides. The interaction of MPOP-4A-IL catalyst with epoxide and CO 2 was further verified by density functional theory (DFT) calculations, and the possible mechanism of the CO 2 cycloaddition reaction was proposed.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Qian Wu,Li Tian,Xiangyu Shan,Huiling Li,Shuning Yang,Chao Li,Juan Lu
In this work, a novel electrochemiluminescence (ECL) sensor based on the CdSe@ZnSe and CNTs was constructed for the detection of melamine. CdSe@ZnSe acted as the co-reaction promoter for the enhancement of Ru(bpy) 3 2+ /tri- n -propylamine (TPrA) system and CNTs acted as carriers to immobilize more CdSe@ZnSe. The initial ECL signal significantly amplified due to the synergistic effect of CNTs and CdSe@ZnSe. The ECL signal decreased with the addition of melamine, and the change value of ECL intensity (ΔI) was linearly related to the logarithm of melamine concentration. The constructed ECL sensor was able to detect melamine in the range of 1.0 × 10 −11 − 1.0 × 10 −7 M, and the detection limit was 3.3 × 10 −12 M (S/N = 3). It can be used to detect melamine in milk samples.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 13
·6342-6352
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IF 3.3
Yang Zeng,Xin Liu,Yimo Zhang,Yan Qin,Xiangtao Tang,Wenqing Zhang,Lingfan Zhang
Numerous micro/nanoscale powdered adsorbents face the problems of poor reusability and difficult separation, which severely restrict their application in effluent treatment. How to effectively solve these problems is still a challenge. In this study, a chitosan–melamine sponge (CTS–MS) composite (CTS/MS = 3 : 2), as a promising adsorbent material with excellent regeneration, easy separation and high adsorption capacity, was tactfully prepared by crosslinking chitosan with a 3D melamine sponge. The obtained CTS–MS composite was employed to evaluate the adsorption properties towards Orange II (OII) anionic dye in wastewater. The characterization results indicated that the CTS–MS composite possessed macropores inside the sponge, which could facilitate the mass transfer of adsorbates from aqueous solutions, and chitosan was well distributed on the surface of the 3D melamine sponge. The adsorption data for OII demonstrated that the adsorption process could be described by the Sips isotherm model and the pseudo-second-order kinetic model, showing a maximum adsorption capacity of 712 mg g−1. The entire adsorption process was found to be spontaneous and endothermic in nature. More importantly, the new composite could be directly separated and desorbed effectively, and the adsorption efficiencies still remained over 99.10% after 10 cycles. Under optimal conditions, the adsorption equilibrium could be basically achieved within 10 min (50 mg L−1, 100 mL, dosage 64.4 mg), and it could be almost desorbed within only 10 s, which could facilitate the recycling of both the CTS–MS composite and the OII dyes. Besides, combined with the results of pH, FT-IR spectroscopy and XPS, the adsorption mechanisms were ascribed to the electrostatic attraction and hydrogen bonding between the CTS–MS composite and dye anions. It is believed that the new 3D CTS–MS composite is a very promising adsorbent for dyeing effluents.
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Canadian Journal of Chemistry
·
2018
·Vol. 97
·期 3
·
IF 1.084
Guo-Ying Zhao,Ling-Ling Mu,Latif Ullah,Meng Wang,Hong-Ping Li,Xin-Xin Guan
In this study, pharmaceutically relevant quinazoline-2,4(1H,3H)-diones were synthesized eco-efficiently by cycloaddition of CO2 and 2-aminobenzonitrile in water, catalyzed by melamine as a thermoregulated catalyst. Quinazoline-2,4(1H,3H)-dione was produced selectively with 92% yield at 120 °C, 4.2 MPa, and automatically separated from the hot catalytic aqueous solution, which was reused directly for several runs until its activity decreased in an obvious manner. Then, the catalyst melamine was recrystallized from the spent aqueous solution via simple cooling and reused for another several catalytic runs. The efficient valorization of CO2 and the straightforward stepwise recovery of the products and catalyst were important to save energy and minimize process waste for the practical industrial production.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Qi Wang,Ling He,Aizhao Pan,Youshen Wu
Nowadays, most of adhesives used for artifacts are colorless and non-removable resins, which makes it difficult to detect repaired location and cause some damage to the artifacts. Herein, we devolved the removable and fluorescent adhesive with melamine-formaldehyde (MF) resin cross-linked polyvinyl alcohol (PVA). The polar sensitive fluorescent dye of 8-anilino-1-naphthalenesulfonic acid (ANS) was encapsulated in the branched MF pre-polymer, and the obtained ANS@MF was employed as cross-linker to prepare cross-linked PVA (ANS@MF-PVA) to yield a series of water-soluble fluorescent adhesives. The obtained ANS@MF-PVA adhesives are colorless and transparent and show strong blue-green fluorescence under UV excitation, enabling it easy to detect their precise location on artifacts. Compared with PVA adhesive, the fluorescent ANS@MF-PVA adhesives present a better thermal stability and enhanced mechanic performance. ANS@MF-PVA samples all show higher adhesive strength (298.25 N, 0.95 MPa to 466.63 N, 1.49 MPa) than pure PVA (201.25 N, 0.64 MPa), which is positively correlated with their MF content. The ANS@MF-PVA is applied to adhere the glass substrates , ceramics and pottery figurine, and demonstrated excellent fluorescence, easy removability, and high durability. We believe that the ANS@MF-PVA fluorescent adhesives will provide art conservators with a new tool to aid in the reconstruction or repair of artifacts.
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ANALYST
·
2018
·Vol. 144
·期 1
·342-348
·
IF 3.864
Shuaihua Zhang,Qian Yang,Xin Zhou,Zhi Li,Wenjin Wang,Xiaohuan Zang,Chun Wang,Muhammad J. A. Shiddiky,Adharvana Chari Murugulla,Nam-Trung Nguyen,Zhi Wang,Yusuke Yamauchi
This study proposes the construction of nanoporous poly-melamine-formaldehyde (PMF) through the Schiff base condensation reaction of paraformaldehyde and melamine. The PMF nanoparticles showed a good adsorption capability to some benzene-ring-containing dyes including acid fuchsine, nigrosine, and methyl orange. Moreover, the as-prepared PMF nanoparticles were employed as the coating adsorbent for the solid-phase microextraction (SPME) of seven volatile fatty acids (VFAs) with high enrichment factors. A PMF-assisted SPME method was established for the enrichment of VFAs from environmental water samples with satisfactory recoveries (88.5%–102.0%) and acceptable precisions (relative standard deviations <10.9%). This contribution might furnish an advanced benchmark for the exploitation of new porous organic polymers as the effective adsorbents for SPME or other fields of utilization.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Guiming Ba,Zhiwei Liang,Haiping Li,Quanhua Deng,Na Du,Wanguo Hou
Constructing mesoporous structure in polymeric carbon nitride (CN) is an effective way to enhance the photocatalytic performance, but rare work achieved this through controlling morphologies of raw materials because of their easy fusion on calcination. Herein, mesoporous melamine (MMA) comprising nanorods was prepared via facile acid processing on commercial MA (CMA), with ~40 times increased specific surface area. By jointly using MMA and the gas template (NH 4 Br) as the precursor for the first time, hierarchically mesoporous CN (HMCN) was simply synthesized with much thinner nanosheets, ~4 times higher specific surface area, stronger photoabsorption, and faster charge separation than bulky CN. On this account, HMCN exhibits much higher photoactivity in H 2 production and for environmental purification. Its visible-light photocatalytic H 2 evolution rate, 1412 μmol g –1 h −1 is ~8.9 times that of bulky CN, and reactive oxygen species generation rates are prominently higher than those of CN. The chemical stability of HMCN in the photoreactions is satisfactory. This work provides a simple way to prepare MMA and a novel strategy to synthesize HMCN, which may guide synthesis of other mesoporous CN-based photocatalysts.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
·
IF 5.16
Wei Wu,Haibing He,Tao Liu,Ruichao Wei,Xianwu Cao,Qijun Sun,Shishir Venkatesh,Richard K.K. Yuen,Vellaisamy A.L. Roy,Robert K.Y. Li
Lignin can be employed as a sustainable functional additive and reinforcement filler for polymers. In this work, melamine phosphate modified lignin (MAP-lignin) was synthesized as a bio-based halogen-free flame-retardant agent. The synergetic effects between MAP-lignin and rice husk ash (RHA) on the thermal stability, dynamic mechanical performance and flame-retardant properties of the poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P34HB) biocomposites were investigated. The results revealed that MAP-lignin and RHA could significantly increase the char residue and MAP-lignin had a good miscibility with P34HB. The incorporation of MAP-lignin and RHA as stiff fillers could enhance the storage modulus of the P34HB matrix. Moreover, the tensile strength and elongation at break of the P34HB/RHA composite could be improved due to the MAP-lignin could serve as a compatibilizer to improve the interaction between RHA and P34HB. Cone calorimetry data demonstrated that the addition of 30 wt% MAP-lignin and 5 wt% RHA reduced the peak heat release rate ( PHRR ) and total heat release ( THR ) of P34HB noticeably by 42.8 and 24.3%, respectively. In addition, the CO 2 production rate and CO concentration could be significantly suppressed by the addition of MAP-lignin. The enhanced flame retardancy of P34HB composite should be ascribed to the barrier effect of the increased char residue with compact and intact structure, as well as the released gases from the decomposition of melamine.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Shaojun Yuan,Ping Zhang,Zhenyi Yang,Li Lv,Shengwei Tang,Bin Liang
Cross-linked chitosan (CCS) microspheres tethered with melamine-conjugated poly(hydroxyethyl methacrylate) (PHEMA) brushes were synthesized by combination of surface-initiated atom transfer radical polymerization (ATRP) of HEMA and subsequent covalent immobilization of melamine onto the chain ends of PHEMA brushes. The as-synthesized CCS microsphere was used as a novel adsorbent for effective uptake of Cu(II) ions from aqueous solution. Success in each functionalization step was ascertained by SEM, ATR-FTIR and XPS characterization. Batch adsorption experimental results demonstrated that the adsorption equilibrium of Cu(II) ions on the melamine-grafted CCS microsphere was rapidly established within 20 min, and the adsorption process was found to be governed by intra-particle diffusion and chemisorption processes. The Langmuir-fitted maximum adsorption capacity of Cu(II) ions on the as-synthesized CCS microspheres was as high as circa 4.67 mmol L −1 (299 mg g −1 ). The calculated thermodynamic parameters revealed an endothermic and spontaneous adsorption process of Cu(II) ions on the melamine-grafted CCS microspheres. XPS spectra revealed that the adsorption mechanism was attributed to coordination (or chelation) interactions between amino (or hydroxyl) groups with cationic Cu(II) ions.
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危险品化学品经营许可证（带存储）