JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Huan Liu,Shuai Li,Luping Feng,Yue Hua,Yuanyuan Cai,Mengyuan Yin,Yuqi Wan,Hua Wang
Mesoporous silver-melamine (Ag-MA) nanocomposites were synthesized by controlled supramolecular self-assembly with various structural morphologies. It was discovered that the rod-like Ag-MA nanocomposites could present the larger Hg 2+ -enhanced catalysis by forming Ag-Hg alloys. Also, they could display large surface-to-volume area and high aqueous stability for the selective Hg 2+ enrichment and absorption of Hg 2+ ions by yielding the stable coordination complexes. A catalysis-based colorimetric method was thus developed using 96-wells plates to probe Hg 2+ ions in blood and wastewater with the linear Hg 2+ concentrations ranging from 1.0 nM to 600 nM and 0.50 nM to 700 nM, respectively. Besides, mesoporous Ag-MA absorbents could facilitate the removal of Hg 2+ ions in wastewater with the removal efficiency up to 99.76 % and the absorption capacity of 598.99 mg g −1 .
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Hualun Li,Ye Li,Bolin Li,Yan Dai,Xi Chen
SOFs and functionalized-MOFs provide potential opportunities for sequestering uranium from radioactive solution. Nevertheless, the nonporous architecture caused by supramolecular reunion as well as the collapse of MOFs structure by chemical modification step remain an inevitable challenge for further uranium recover and treatment. Herein, we proposed a novel melamine-induced strategy for the first preparation of heterostructured framework (MSONs) based on a self-assembling approach to realize a controlled-switching of structure between MOF and SOF. The MSONs adsorbent was directly constructed using N-donor-containing MA and O-donor-containing TMA as the building units. And then the high-nuclearity metal ions were inserted into the topological structure of SOF to snatch abundant building active sites when they competed with MA to interact with three O-containing linkers on both sides of each TMA molecule. The subsequent chemical modification and supramolecular reunion phenomenon can be effectively avoid by transforming the topology architectures from original MOF-dominated polyhedron to SOF-dominated elongated nanotubes. The obtained MSONs was characterized by SEM, XPS, XRD, TGA and FT-IR spectrometry. Among six kinds of MSONs adsorbents, MSONs-5 exhibited an extremely high UO 2 2+ loading capacity (526.6 mg/g) during the morphological transformation process, which exceeds the most of the previously reported powerful uranium adsorbents. Taking advantage of this extraordinary heterostructured framework and multiple interactions, MA-induced MSONs can be treated as a promising candidate for uranium sequestration.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Shuguo Qu,Minhui Li,Chenchen Zhang,Jihai Duan,Weiwen Wang,Jianlong Li,Xiaojin Li
A novel proton exchange membrane was synthesized by embedding a crystalline which was nano-assembled through trimesic acid and melamine (TMA·M) into the matrix of the sulfonated poly (ether ether ketone) (SPEEK) to enhance the proton conductivity of the SPEEK membrane. Fourier transform infrared indicated that hydrogen bonds existed between SPEEK and TMA·M. XRD and SEM indicated that TMA·M was uniformly distributed within the matrix of SPEEK, and no phase separation occurred. Thermogravimetric analysis showed that this membrane could be applied as high temperature proton exchange membrane until 250 °C. The dimensional stability and mechanical properties of the composite membranes showed that the performance of the composite membranes is superior to that of the pristine SPEEK. Since TMA·M had a highly ordered nanostructure , and contained lots of hydrogen bonds and water molecules, the proton conductivity of the SPEEK/TMA·M-20% reached 0.00513 S cm −1 at 25 °C and relative humidity 100%, which was 3 times more than the pristine SPEEK membrane, and achieved 0.00994 S cm −1 at 120 °C.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Hang Zhao,Jinhua Wu,Jianlong Li,Hao Wu,Yun Zhang,Heng Liu
MoS 2 has been investigated extensively as novel energy storage materials because of its unique physical and chemical properties. Herein, a flexible Three-Dimensional (3D) free-standing composite is rationally designed and synthesized by growing MoS 2 nanosheets onto carbonized melamine foam. Afterwards, nitrogen-doped carbon (NC) coating is created on the bare MoS 2 nanosheets depends on dopamine self-polymerization. The composite can be used directly as a free-standing anode for lithium-ion batteries. It exhibits high reversible lithium storage capacity with good cyclic performance (573.8 mAh g −1 at current density of 500 mA g −1 after 200 cycles) and rate capability (536.9 mAh g −1 at current density of 2000 mA g −1 ). The outstanding electrochemistry properties are mainly attributed to the well-designed architecture. The interconnected carbon skeleton provides 3D fast transport paths for electron. NC coating on MoS 2 nanosheets and the carbon filled in the interspaces between MoS 2 nanosheets serves as conductive matrix which enhances the electrical conductivity, expands the path of electron transport and accelerates electron transfer.
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FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 7
·1363-1372
·
IF 1.353
Fu Yifan,Teng Yun,Yu Guomin,Yin Cuiyu
Unmodified polyamide 6 commonly dyed with acid dyes, and has no flame-retarded properties. So they are flammable and can be easily stained by foods or drinks that contain acid dyes. However, the acid groups react with amino groups that existed at the end of PA6 chain while using cationic dyes. Thus, the acid dyes can be washed immediately. In this study, the flame retardant and cationic dyeable polyamide 6 (FRCD-PA6) modified with 5-sulfoisophthalic acid sodium (5-SSIPA) and melamine cyanurate (MCA) was successfully prepared by the two-step-melt polymerization method. Firstly, cationic dyeable polyamide 6 (CD-PA6) was prepared with sodium salt from 5-sulfoisphthalic acid. Secondly, melamine cyanurate, as an efficient flame retardant, was blended into the reaction. The chemical and crystalline structures of FRCDPA6 were characterized by the Fourier transform infrared spectroscopy (FT-IR) and wide angle X-ray diffraction (XRD). Their thermal properties were tested by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), and morphology was analyzed by SEM, respectively. It had been measured to prove the dispersion of 5-SSIPA and MCA on polyamide 6 matrix. Incorporating with 5-SSIPA created more amorphous regions and rose up the dyeing rate easily, with a highest dyeing rate for about 96.79 %. The effect of varying MCA content on the composites showed more flame retardant and made better heat-resistance. Moreover, with the appropriate addition of MCA content, the limit oxygen index (LOI) reached up to 27, less smoking, no more black smoke, droplet phenomenon was slightly, and flame resistance had greatly improved. Because of the good synergy between 5-SSIPA and MCA, a kind of novel modified polyamide 6 which own both cationic dyeable and efficient flame retardant properties was born.
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Royal Society Open Science
·
2018
·Vol. 5
·期 9
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IF 2.504
Q. Zhou,X. C. Tan,X. J. Guo,Y. J. Huang,H. Y. Zhai
We synthesized a selective molecularly imprinted solid-phase extraction (MIP-SPE) column and established an extraction and enrichment method using this MIP-SPE column. By coupling with HPLC, we developed a new method to detect trace amounts of melamine in eggs. The MIP-SPE column was synthesized by in situ thermal-initiated polymerization using melamine as the template, methacrylic acid as the functional monomer, ethylene glycol dimethacrylate as the cross-linker and azodiisobutyronitrile as the initiator. HPLC was used to evaluate the identification and enrichment capability of the MIP-SPE column and for the measurement of melamine in the sample. The melamine concentration exhibited an excellent linear relationship in the range of 0.1–25.0 µg ml−1 (r = 0.9983). The identification capability of the MIP-SPE column was apparently superior to that of the non-imprinted polymer solid-phase extraction column; an average enrichment factor of 46.8-fold (RSD = 3.5%) was obtained for 0.4 µg ml−1 melamine by the MIP-SPE column. When the MIP-SPE HPLC method was applied to the detection of melamine in eggs, an average recovery rate of 93.5–102.0% (RSD = 3.6–4.9%) and a limit of detection of 0.05 µg kg−1 were obtained. This method is simple, fast and cost-effective; thus, it can greatly simplify the pre-treatment of complex samples and can be used in the detection of residual melamine in eggs and other products.
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Analytical Methods
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2016
·Vol. 8
·期 22
·4438-4444
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IF 1.915
C. H. Lei,X. E. Zhao,S. L. Jiao,L. He,Y. Li,S. Y. Zhu,J. M. You
We have proposed here a facile, simple, and cost-effective turn-on assay for melamine with carbon nanodots (C-dots) as a fluorescence reader. Melamine is prone to coordinate with Hg2+ due to the presence of a multi-nitrogen heterocyclic ring. This property is the cause for the anti-quenching ability of Hg2+ to C-dots through decreasing the interaction between Hg2+ and C-dots. By this method, a detection limit of 0.3 μM is obtained, which is approximately 65 times lower than that of the US Food and Drug Administration estimated melamine safety limit of 20 μM. In addition, several real samples including raw milk and milk powder are analyzed using the sensing system with satisfactory recoveries. This research may expand the applications of C-dots as the fluorescent probe in food safety.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 39
·45234
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IF 1.86
Lei Liu,Zhengzhou Wang,Xiaoyan Xu
Melamine amino trimethylene phosphate (MATMP) as a novel nitrogen-phosphorus flame retardant, was synthesized by the reaction of melamine with amino trimethylene phosphonic acid (ATMP) in aqueous solution. The structure of MATMP was characterized by Fourier transform infrared spectroscopy, solid state 31 P nuclear magnetic resonance, and thermogravimetric analysis. Rigid polyurethane (RPU) foams were prepared by one-shot and free-rise method, using MATMP as a flame retardant. The flame retardant, mechanical and thermal properties of MATMP in RPU foams were studied. It is found that the RPU foam containing 15 wt % MATMP (sample RPUMA-15) can pass the UL-94 V0 test with a limiting oxygen index of 25.5%. The cone calorimeter test results show that the peak heat release rate of RPUMA-15 is reduced about 34% compared with that of untreated RPU foam. SEM results indicate that the RPU foams with MATMP can form the good and compact char during burning which provides better flame retardancy. The compressive strength of the RPU foams filled with MATMP first increases and then slightly decreases with an increase in the MATMP content comparing with that of untreated RPU foam. Moreover, thermal conductivities of the MATMP filled RPU foams are about 0.03 W/m K. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45234.
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JOURNAL OF HAZARDOUS MATERIALS
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2016
·
IF 4.836
Xiaming Feng,Xin Wang,Wei Cai,Ningning Hong,Yuan Hu,Kim Meow Liew
A novel strategy of using supramolecular self-assembly for preparing sandwich-like melamine cyanurate/MoS 2 sheets as the hybrid flame retardants for polyamide 6 (PA6) is reported for the first time. The introduction of MoS 2 sheets function not only as a template to induce the formation of two-dimensional melamine cyanurate capping layers but also as a synergist to generate integrated flame-retarding effect of hybrid sheets, as well as a high-performance smoke suppressor to reduce fire hazards of PA6 materials. Once incorporating this well-designed structures (4 wt%) into PA6 matrix, there resulted in a remarkable drop (40%) in the peak heat release rate and a 25% reduction in total heat release. Moreover, the smoke production and pyrolysis gaseous products were efficiently suppressed by the addition of sandwich-like hybrid sheets. The integrated functions consisting of inherent flame retarding effect, physical barrier performance and catalytic activity are believed to the crucial guarantee for the reduced fire hazards of PA6 nanocomposites. Furthermore, this novel strategy with facile and scalable features may provide reference for developing various kinds of MoS 2 based hybrid sheets for diverse applications.
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ANALYTICA CHIMICA ACTA
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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.
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CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Lu Shen,Yinfu Luo,Long Ni,Mei Liang,Shengtai Zhou,Huawei Zou
It is a great challenge to prepare lightweight porous materials with high-efficiency broadband sound absorption and good mechanical properties. In this work, a series of melamine foams (MF) which were decorated by silver (Ag) and cellulose nanofiber (CNF) were prepared by the in-situ deposition and freeze-drying method. The deposition of Ag particles on the foam skeleton formed nanopores, and hierarchical porous structures were constructed along with the existence of micropores in MF. In addition, the formation of filamentous CNF structure further optimized the pore structure, which resulted in achieving excellent broadband sound absorption and enhanced mechanical properties of corresponding composite foams. Specifically, Ag@MF-6-CNF achieved more than 95 % sound absorption efficiency in the range of 2500–6400 Hz. Besides, the compressive strength of Ag@MF-6-CNF reached 13.8 kPa at a strain rate of 50 %, which was 75 % higher than pure MF. The proposed method provided a reference for preparing lightweight porous materials for noise attenuation applications in industrial sectors.
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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.
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