SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Zeng-Tian Li,Hao-Tong Wu,Wan-Yi Chen,Fu-An He,De-Hao Li
In this work, hydrophobic magnetic nanoparticles (MNPs) were successfully synthesized by the one-pot solvothermal reaction at the presence of surface modifier for the first time and characterized by SEM, EDS, TEM, WAXD, TGA, FTIR, and XPS. The fabrication of the magnetic superhydrophobic melamine sponge was realized by the deposition of the as-synthesized hydrophobic MNPs on the melamine sponge using a simple drop-coating method with the aid of silicone adhesive to achieve a firm attachment. The resultant surface-modified durable melamine sponge exhibited not only the high absorption capacities for different oil and organic solvent ranging from 39.8 g/g to 78.7 g/g but also the good reusability for absorption even after 14 absorbing-squeezing cycles. The oil absorption ability of the magnetic superhydrophobic highly-porous melamine sponge was much better than that of the magnetic superhydrophobic polyurethane sponge with relatively low porosity. Moreover, it could be found from the demonstrating experiments that the as-prepared magnetic superhydrophobic melamine sponge had the abilities to (1) remove the floating peanut oil from water followed by convenient magnetic recovery, (2) separate CH 2 Cl 2 from water as a filter only driven by gravity, (3) absorb and collect peanut oil continuously from water surface assisted by a vacuum pump. We believe that the as-prepared magnetic superhydrophobic melamine sponge should have great potential in the effective oil-water separation.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2021
·Vol. 37
·期 1
·294-303
·
IF 3.089
Chang Chao,Liu Min,Li Lanxin,Chen Guowei,Pei Lilin,Wang Zongyu,Ji Yulong
Abstract Solar-driven interfacial desalination has been emerged as a promising water treatment technology to generate drinkable water out of seawater. The accumulated salt crystals generated from seawater, however, have adverse effects on solar-driven interfacial evaporation. In this work, we prepared a salt-rejecting reduced graphene oxide (rGO) foam by depositing rGO particles on a hydrophilic melamine foam for solar desalination. Benefitting from the intrinsic porous microstructure and hydrophilicity, the rGO-coated melamine foam has sufficient wettability to draw water to the evaporation region, leading to rapid replenishment of water and simultaneously avoiding salt precipitation. Based on the rGO-coated melamine foam, the interfacial evaporation system can achieve a steady-state evaporation efficiency of 89.6% under a solar flux of 1 kW m −2 and has good durability under one sun over 12 h. With the high solar-to-thermal conversion efficiency and excellent long-term stability, this interfacial evaporation system exhibits the potential of commercial seawater desalination. Graphic abstract
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 29
·期 1
·279-289
·
IF 2.496
Cheng Zuqin,Zheng Ke,Zhou Shaoqi
This study developed a facile and environmentally-friendly method to prepare SiO 2 /silk fibroin (SF) composite melamine sponges modified using SF and hydrophobic SiO 2 nanoparticles (NPs). During the preparation procedure, the SiO 2 NPs were bonded to skeletons of porous sponges with the SF binding agent using a dip-coating method. The SiO 2 NPs and SF with hydrophobicity constructed a rough surface. The obtained sponges possess a high absorption capacity of 70.9–160.8 times of its weight for various oils and organic solvents and a high water-contact angle greater than 151°. More importantly, the modified sponges showed good recyclability, and could return to its original shape even after 100 cyclic compression. The as-prepared sponge also showed high buoyancy outstanding elasticity, and maintained high absorption capacity even after 10 cycles of repetitive absorption-desorption. The prepared sponges could efficiently separate oil or organic solvents from oil–water mixtures, indicating that the SiO 2 /SF/MS sponges are promising candidates for remediating oil spills and oily wastewater.
研究领域:
材料科学
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环境工程
·
化学工程
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DOI
高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 30
·e202201427
·
IF 2.307
Yani Li,Xixia Liu,Yaoyao Hou,Qin Wu,Jianjun Hou
Graphical Mel-34 is a aptamer for melamine. In this paper, we carefully studied the base-pair (A−T, G−C) function in the stem regions using label-free thiazole orange (TO) staining assay. Then, we used isothermal titration calorimetry (ITC) to verify the binding activity, and the fluorescence resonance energy transfer (FRET) biosensor based molecule-beacon was established to detect melamine in yogurt sample. Melamine is an illegal additive in milk products. Mel-34 is an aptamer specific for melamine. In this paper, we studied the base-pair function in the stem regions of Mel-34 using label-free thiazole orange (TO) staining assay. Then, we used isothermal titration calorimetry (ITC) to verify the binding activity, and the fluorescence resonance energy transfer (FRET) biosensor based molecule-beacon was established to detect melamine in yogurt sample. We found one of the mutants (mut6) has four folds higher affinity than Mel-34, which indicated its critical binding domain was G18-C25 base pair. We detected melamine in 1 % yogurt sample using mut6 as recognition molecule, the linear range was below 20 μM and the limit of detection was 4.09 μM which is below the melamine threshold (1.0 mg/kg) in milk products. This work calls for carefully study the critical binding domain to discover higher affinity aptamer specific for small molecule using label-free method.
研究领域:
分析化学
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食品安全
·
分子生物学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xiaotong Mu,Lihua Chen,Nannan Qu,Jiale Yu,Xiaoqian Jiang,Chaohu Xiao,Xingping Luo,Qimeige Hasi
The application of photothermal materials in seawater desalination, wastewater treatment have been widely studied, however, there are relatively few studies that combine photothermal effects and solar-driven photocatalysis and exhibit efficient solar-driven water evaporation performance and excellent photocatalytic ability. Form the perspective of practical application, it is of great significance to combine photothermal effect with solar-driven photocatalysis to develop environment-friendly evaporator with low cost, simple preparation process and ability of seawater desalination, wastewater treatment and photodegradation of organic dyes. In this paper, a novel multifunctional MXene/polypyrrole (PPy) coated melamine foam (MF) named as MF-MXene/PPy was successfully prepared by simple impregnation and in-situ polymerization. The MF-MXene/PPy has rich porosity (89.13 %), abundant water molecule transport channels, excellent light absorption capacity (about 94 %), low thermal conductivity (0.1047 W m −1 K −1 ), and exhibits excellent performance in solar desalination, wastewater purification and photodegradation of organic dyes. Under 1 kW m −2 illuminate, the solar energy conversion rate and efficiency of MF-MXene/PPy reaches up to 1.5174 kg m -2 h −1 and 91.24 %. Moreover, due to the regular pore size of MF-MXene/PPy, good salinity tolerance was shown even after continuous evaporation in 20 wt% NaCl for 8 h. After continuous evaporation in 70 mL of 20 wt% NaCl for 8 h, the amount of salt collected could reach 0.2 g. In addition, MF-MXene/PPy also possessed excellent visible light degradation ability for organic dyes, and the degradation rate of methylene blue (MB), rhodamine B (RHB) and methyl orange (MO) were 92.38 %, 88.92 % and 91.75 %, respectively. As a fundamental research, this research will open a novel way to the development of new evaporator.
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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纳米技术
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Yongsheng Chen,Yi Xue,Sijia Ma,Haochuan Shi,Yanru Wang,Hongqiang Ren,Ke Xu
Recent advancements in functional sponge materials have garnered significant interest due to their efficacy and cost-effectiveness in oil spill remediation. This study introduces both silane coupling agent (methyltrichlorosilane and 3-aminopropyltriethoxysilane) and nano-SiO₂ particles into the melamine sponge framework via impregnation. Additionally, polydimethylsiloxane (PDMS) serves a crucial role in curing to fuse the substrate with the coating through robust covalent bonds. The modified sponges (SiMAPs) facilitate the formation of rough surfaces comprising hierarchical structures by the deposition of nano-SiO₂ particles, while the silane coupling agents and PDMS contribute to a reduced surface energy. These SiMAP sponges maintain high stability with a water contact angle of 162.6° and demonstrate an adsorption capacity ranging from 40 to 90 times their weight in oil or organic solvents. Furthermore, they achieve a separation efficiency exceeding 98% and an oil flux of 14.38 L/m 2 ∙s in immiscible oil-water mixtures. Additionally, the sorption of trichloromethane reaches 88.1 g/g, and the separation efficiency for surfactant-stabilized emulsions containing diesel is 62.8%. Remarkably, the oil-water separation efficiency surpasses 99.8% in dynamic continuous oil-water separation cycles, as evidenced by 20 experimental trials. These results underscore the substantial potential of SiMAP-modified sponges for addressing oil pollution by enhancing oil-water separation.
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
PubMed
高影响因子
SURFACE REVIEW AND LETTERS
·
2014
·
IF 0.367
LING ZHU,XUMING XU,YAN WANG,SHUYI LIU,JIE LING,LACHENG LIU,SHENG WEI,FENG CAI,ZHONGPING WANG,XIAOQING LIU,LI WANG
The assembled structures of triangular symmetrically shape molecules with three functional groups, trimesic acid (TMA) and melamine, have been investigated by scanning tunneling microscopy on Highly Oriented Pyrolytic Graphite (HOPG) in ambient. Hexagonal porous structures are formed by these molecules and the cavity of the assembled structure becomes bigger when larger molecules are used as building blocks. The cavity within the assembled structure formed by TMA is bigger enough to host guest molecule.
研究领域:
材料科学
·
表面化学
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DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Ting Huang,Sheng Cao,Dan Luo,Nan Zhang,Yan-zhou Lei,Yong Wang
Melamine foam (MF) is a widely used commercial product and exhibits wide applications in many fields ranging from building, transportation to daily chemical product. Recent researches confirm that the special three-dimensional (3D) framework structure of MF can be an ideal substrate to prepare functional materials. In this work, the water-soluble polyethylenimine (PEI) was grafted onto the framework of MF to develop the water purification material toward heavy metal ions removal. The grafting of PEI on MF was achieved with the aids of polydopamine (PDA) coating and epoxy chloropropane (ECH) cross-linking successively. The 3D framework of MF could be well reserved and PEI was homogeneously grafted onto the framework surface. The adsorption capacity of the adsorbent was dependent upon the molecular wight of PEI. Lower PEI molecular weight endowed the adsorbent with better adsorption ability. The maximum adsorption capacity reached 328.95 mg/g, and the adsorbent exhibited extremely high adsorption stability with increasing cycling measurement numbers. Further results showed that the adsorbent also exhibited high reduction ability and induced about 62.5% toxic Cr(VI) to be reduced. This work confirms that the PEI-modified MF sample is a promising adsorbent in the removal of heavy metal ions and it can be used in wastewater treatment .
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
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 32
·e52737
·
IF 3.057
Jianming He,Shaoying Liu,Dongliang Chen,Gongying Wang,Qingyin Wang
Melamine formaldehyde fiber is widely used in various fields because of its excellent heat resistance and flame-retardant properties. In this study, melamine and paraformaldehyde are used as the main raw materials, 2,2′-bis(trifluoromethyl)benzidine (TFMB) is successfully introduced into the molecular chain. The TFMB modified spinning solutions (MF-TFMB) are obtained by one-step copolymerization, the TFMB-modified melamine-formaldehyde fibers (MFF-TFMB) are prepared by dry spinning. The surface contact angle and surface energy are measured by a contact angle measuring instrument. The thermal stability and mechanical properties of the fibers are measured by a thermogravimetric analyzer and a single-fiber strength tester. The results show that the introduction of the TFMB group reduces the surface free energy of the polymer and effectively improves the heat resistance and mechanical properties of the fiber. When the addition amount of TFMB is 3%, the MFF-TFMB-3% fiber has smooth surface and bubble-free inside, the breaking strength is 2.25 cN/dtex and the elongation at break is 11.85%. The limiting oxygen index is 32.5%, and the mass loss rate is decreased from 63.88% to 51.36% at 400°C. The fiber has excellent thermal stability and flame-retardant properties.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
ANALYST
·
2012
·Vol. 137
·期 22
·5382-5386
·
IF 4.23
Wei Chen,Hao-Hua Deng,Lei Hong,Zeng-Qiang Wu,Sheng Wang,Ai-Lin Liu,Xin-Hua Lin,Xing-Hua Xia
In this study, we demonstrate a more sensitive colorimetric assay for the detection of melamine based on the strong attraction between exocyclic amine groups of melamine and surface-bound AuCl4−/AuCl2− ions on bare gold nanoparticles prepared by the borohydride reduction method. This method is rather simple without further modification of gold nanoparticles and complicated pretreatment of samples. The detection limit of the method is 2.0 × 10−7 g L−1 for melamine in infant formula, which is much lower (about 1000-fold) than that of using citrate-capped GNPs as a colorimetric probe. The proposed scheme could be a good alternative means for on-site and real-time screening of melamine adulterant in infant formula without costly instruments.
研究领域:
分析化学
·
食品安全检测
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DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Chenhong Yu,Li Li,Yaping Ding,Huajie Liu,Hanyue Cui,Fenfen Zhang,Jiaxin Lin,Yingchun Duan
An electrochemical aptamer sensor based on gold nanoparticles (AuNPs) was developed for highly specific sensing of melamine (MEL), which combines molecularly imprinted polymers (MIPs) and aptamers. AuNPs were synthesized by simple reduction of sodium citrate and characterized by transmission electron microscopy. The MIP membranes with particular recognition sites were formed by electropolymerization of dopamine (DA) with polythymine (poly T) aptamers as functional monomers and melamine as template molecules. Under optimal experimental conditions, this molecularly imprinted electrochemical aptamer sensor (MIEAS) exhibits a linear relationship between 10 −12 M and 10 −4 M for detecting MEL with the detection limit of 6.7 × 10 −13 M. Moreover, this sensor displays excellent selectivity, reproducibility and stability. The milk samples analysis has confirmed the potential application of this MIEAS to quantitative detection of melamine.
研究领域:
分析化学
·
电化学
·
纳米技术
·
食品安全
✓ 已验证
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2026
·
IF 8.2
Feng Li,ZeZhou He,JiaHao Li,SiChao Zhang,Jun Xia,Liu Wang,HengAn Wu,YinBo Zhu
Layered graphene oxide (GO) films are promising structural materials, but their strength and ductility are limited by weak, porous interfaces that lose load transfer during interlayer sliding. Here we report a nacre-like reduced graphene oxide/melamine (rGO/Mel) film coupling dense lamellar stacking with strong, constrained yet dynamically reconfigurable noncovalent interactions. Melamine is introduced between GO sheets and retained after hydroiodic acid reduction, while the reduced sheets form flatter, more compact stacks with smaller interlayer spacing. Melamine’s triazine rings interact with graphitic domains through π–π stacking, and its amine groups form reversible hydrogen bonds with residual oxygen-containing groups, sustaining shear transfer while allowing controlled sliding. Under tensile loading, rGO/Mel exhibits pronounced post-yield strain hardening associated with nanosheet straightening, interfacial reorientation and continued molecular bridging. The optimized film reaches a tensile strength of 262.7 MPa, a strain at break of 5.0 % and a toughness of 6.0 MJ m⁻ 3 . These values represent increases of 538 %, 317 % and 2900 % over pure GO, respectively. Molecular dynamics simulations support this picture by showing more stable interlayer contact and melamine-assisted shear transfer in rGO/Mel. This work shows that constrained noncovalent interfaces can turn interlayer sliding from a failure pathway into a source of strain hardening in layered nanocomposites.
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高影响因子
危险品化学品经营许可证（带存储）