JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Feng Chu,Yezi Hu,Kaiyue Zhang,Xiangjun Li,Guixia Zhao,Xiubing Huang,Ge Wang
Conjugated polymers have a broad application foreground in the field of photocatalytic organic synthesis to produce value-added chemicals due to their functional diversity, broad light responsive ability, high thermal and chemical stability, and tunable band structure . Herein, using mixed chloride salts (i.e., NaCl/LiCl) as building template, a series of porous conjugated polymers constructed by melamine and terephthalaldehyde monomers were obtained through a Schiff-base reaction in the absence of any external solvent. Melamine-terephthalaldehyde polymer (i.e., PMTPA-x, x represents the mass ratio of salt-mixture to mixed precursors of PMTPA) materials displayed porous morphologies and possessed different energy band structures via regulating the mass ratio of mixed-salt to monomers. Specifically, PMTPA-20 has a larger specific surface area and more suitable redox potential towards the photocatalytic oxidative coupling of amines to imines . Under visible light , with molecular oxygen as oxidant, PMTPA-20 achieves 97% conversion of benzylamine in 8 h which is 3.9 times higher than that of pristine PMTPA (25% conversion in 8 h). In addition, PMTPA-20 catalyst has good structure stability and reusability performance for photocatalytic reactions.
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高影响因子
ANALYTICAL LETTERS
·
2023
·
IF 2
Yijing Liu,Lan Xu
L-Cysteine (L-Cys) and two-dimensional monolayer films of gold nanoparticles (2D MFGS) were employed to modify gold electrodes to build uniform and stable multilayer films by layer-by-layer (LbL) self-assembly, denoted by Au/(L-Cys/2D MFGS)n (n = number of layers). Electrochemical measurements showed that the specific surface area and current amplification capacity of the modified electrode increased with the value of n. In addition, considering the orderliness inside the multilayer 2D MFGS assembly and experimental accessibility, Au/(L-Cys/2D MFGS)n=4 was selected to be the working electrode and dopamine (DA) as the signal quantification molecule for the indirect detection of melamine (MA). The results showed that the oxidation current of DA was inhibited due to the competitive adsorption of melamine upon the working electrode. Under the optimal conditions, the decrease of the dopamine peak anode current is proportional to the melamine concentration from 10−12 to 10−3 M with a detection limit of 0.13 pM. The results demonstrate the potential of 2D MFGS for applications in food and biological analysis. The scheme for fabricating the multilayer electrodes is convenient and environment-friendly, without expensive instrumentation or complex modifications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 15
·44266-44275
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IF 5.8
Yu Xiaoxiao,Wei Yicui,Qi Wei,Wang Mengfan
Water-insoluble organic pollutants in environment, such as sea oil spill, industrial reagents, and the abused organic pesticides, bring great risks to global water systems, which thus requires effective approaches for organic pollutant elimination. In this study, we report a catalytic metal–organic framework (MOF)-melamine foam (MF) composite material (DDT-UiO-66-NH 2 @MF) showing excellent oil–water separation performance and enzyme-like degradation ability toward organophosphorus pesticides. The fabrication of DDT-UiO-66-NH 2 @MF is based on the immobilization of a MOF-derived nanozyme (UiO-66-NH 2 ) on MF sponge, and followed by the hydrophobic modification of UiO-66-NH 2 by 1-dodecanethiol (DDT). The obtained DDT-UiO-66-NH 2 @MF thus displayed superhydrophobic/superhydrophilic property with a high water contact angle (WCA = 144.6°) and specific adsorption capacity toward various oils/organic solvents (62.2–119.8 g/g), which leads to a continuous oil–water separation on a simple device. In the meanwhile, owing to the enzyme-like property of UiO-66-NH 2 , DDT-UiO-66-NH 2 @MF also displayed good ability to hydrolyze paraoxon under mild conditions, which facilitates the elimination of toxic pesticide residuals in water systems. This work provides a simple, efficient, and green approach for the separation and treatment of water-insoluble organic pollutants, as well as expands the use of MOFs-MF sponge composite materials in environmental sustainability.
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高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 10
·1866-1876
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IF 3.756
Shuai Han,Cui Liu,Nian Li,Shudong Zhang,Yanping Song,Liqing Chen,Min Xi,Xinling Yu,Wenbo Wang,Mingguang Kong,Zhenyang Wang
Heteroatom doping of graphene electrodes is a valid strategy to enhance their capacitive performance. This work demonstrates a facile and expandable methodology for the in situ fabrication of nitrogen-doped laser-induced graphene (N-LIG) by the precursor composite approach in conjunction with laser induction technology. Melamine (C3H6N6) with high N content was compounded with polyimide to form a composite film, on which N-LIG was synthesized by one-step in situ laser pyrolysis. In this process, N elements from melamine were successfully doped into the graphene structure. As a result, the optimal N-LIG electrode exhibited a desirable specific areal capacitance (CA) of 56.3 mF cm−2 at 0.4 mA cm−2 in 1 M H2SO4 aqueous electrolyte, which was 7.2 times that of the pristine undoped LIG electrode. Besides, the N-LIG electrode obtained on the composite film kept good flexibility, which laid a foundation for the industrial roll to roll production of N-LIG. Furthermore, the N-LIG-based all-solid-state micro-supercapacitor (MSC) revealed a high CA of up to 35.20 mF cm−2 at 0.05 mA cm−2 and an impressive cyclic stability of 85.5% after 10 000 cycles. This presented strategy possesses the advantages of environmental protection, economy and convenience, and exhibits a broad application prospect in flexible wearable electronics and energy storage devices.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jinqiang Sun,Jing Zhang,Mengge Shang,Minna Zhang,Xinfu Zhao,Sijia Liu,Xiaochan Liu,Shuo Liu,Xibin Yi
Hierarchical porous carbon shows great potential in the field of energy storage due to high porosity, large surface area, and excellent electrical conductivity. Here, we successfully fabricated carbon aerogel derived from sodium alginate/melamine composite (SAM) by directional freeze-drying combined with simple carbonization and activation process. The optimal SAM-700-4 possesses a high nitrogen (5.67 at.%) and oxygen (8.98 at.%) contents along with high specific surface area of 2577.62 m 2 /g and unique directional channel structure. Due to their synergistic effect, the SAM-700-4 electrode exhibits a high specific capacitance of 441.80 F/g at a current density of 0.5 A/g. Interestingly, the all-solid-state symmetric supercapacitor based on SAM-700-4//SAM-700-4 in PVA/SA/KOH gel electrolyte has a large energy density of 20.87 Wh/kg at a power density of 4000 W/kg and exhibits excellent cycling stability. It is believed that this N, O co-doped directional hierarchical porous carbon aerogel may show promising prospects as advanced energy storage materials.
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NANOTECHNOLOGY
·
2021
·Vol. 33
·期 8
·085704
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IF 3.874
Haiyang Liu,Jiaxing Wang,Miao Sun,Yu Wang,Runing Zhao,Xiaojie Zhang,Yanfei Zhao
Lithium–sulfur (Li–S) batteries have been considered to be one of the most promising energy storage devices in the next generation. However, the insulating properties of sulfur and the shuttle effect of soluble lithium polysulfides (LiPSs) seriously hinder the practical application of Li–S batteries. In this paper, a novel porous organic polymer (HUT3) was prepared based on the polycondensation between melamine and 1,4-phenylene diisocyanate. The micro morphology of HUT3 was improved by in situ growth on different mass fractions of rGO (5%, 10%, 15%), and the obtained HUT3-rGO composites were employed as sulfur carriers in Li–S batteries with promoted the sulfur loading ratio and lithium-ion mobility. Attributed to the synergistic effect of the chemisorption of polar groups and the physical constraints of HUT3 structure, HUT3-rGO/S electrodes exhibits excellent capacity and cyclability performance. For instance, HUT3-10rGO/S electrode exhibits a high initial specific capacity of 950 mAh g−1 at 0.2 C and retains a high capacity of 707 mAh g−1 after 500 cycles at 1 C. This work emphasizes the importance of the rational design of the chemical structure and opens up a simple way for the development of cathode materials suitable for high-performance Li–S batteries.
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高影响因子
COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Jiamei Luo,Xueqin Yang,Rogers Tusiime,Haonan Chen,Yong Liu,Hui Zhang,Jianyong Yu
High heat conduction epoxy resins with a more than twofold increase in thermal conductivity at a low filler addition were fabricated by construction of three-dimensional synergistic thermal conductive networks at macro and micro scales. Shortly, boron nitride nanoplates/carbon nanotubes (BNs/CNT) were embedded into each other and assembled on 3D melamine foam skeletons via electrostatic interaction , prior to addition of epoxy resin. The introduced melamine foam has the characteristics of strong adsorption and ultra-high porosity, which are convenient for BNs/CNT to establish multiscale synergistic heat conduction channels at a microscopic scale. The morphological characteristics of M(BNs/CNT)x were revealed by FESEM and elemental mapping images pointed to continuous BNs/CNT thermal paths forming along the 3D skeleton of the melamine foam within epoxy resin. Consequently, the thermal conductivity of the epoxy resin improved from 0.21 W m −1 K −1 to 0.43 W m −1 K −1 at a rather low filler content of BNs/CNT (about 0.43 wt%, ∼1/1). The epoxy resin further possessed a relatively low dielectric constant (about 7.38 at frequency = 10 7 Hz) as suggested by dielectric characteristic analysis. This presents promising application prospects in the field of electrical insulation materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Xinyao Liu,Liangjie Wang,Feng Qian,Zhuolin Qing,Xiaolin Xie,Yonghui Song
Nitrogen-doped carbon materials can effectively activate peroxymonosulfate (PMS) to degrade organic pollutants. In this study, one or more of the following raw ingredients, ferric nitrate, dopamine hydrochloride and melamine, were used as raw materials to prepare different carbon-based catalysts. The different effects of each raw ingredient on the performance of the catalyst were studied. Characterization by X-ray diffract grams spectra, Raman spectroscopy and X-ray photoelectron spectroscopy found that Fe(NO 3 ) 3 ·9H 2 O in the catalyst is beneficial to promote the degree of graphitization, and melamine can increase the nitrogen content in the catalyst. The prepared Fe-DA-CN catalyst, prepared with three materials has the highest activity. When the catalyst dose was 50 mg/L and the PMS concentration was 0.25 mM, the removal rate of 5 mg/L sulfamethoxazole (SMX) reached more than 99% after 30 min of reaction; furthermore, the pH, presence of inorganic anions (HPO 4 2- , NO 3 – , CO 3 2– , Cl - ) and presence of humic acid had little effect on the SMX removal rate. Repeated use experiments show that the catalyst has good stability. Through electron paramagnetic resonance and quenching tests, it is found that the main active substances that activate PMS to degrade SMX are free radicals (·OH, SO 4 ·- ) bound on the catalyst surface and a small part of singlet oxygen ( 1 O 2 ).
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Jinghang Wang,Xinyu Zhai,Zunrui Zhong,Xinwen Zhang,Hao Peng
A series of nanoencapsulated phase change materials with n-tetradecane as the core material and melamine–urea–formaldehyde (MUF)–TiO 2 composite as the shell material was developed using a two-step method. Sol-gel and blending modification methods were respectively utilized after the in situ polymerization. The physical, chemical, and thermal properties of the nanoencapsulated phase change material (NEPCM) samples were characterized. Furthermore, a comprehensive performance evaluation system was established based on the efficacy coefficient method. The results indicated that the average diameter of the nanocapsules was significantly increased by the sol-gel modification and was slightly influenced by the blending method. All NEPCMs exhibited high chemical and thermal stability. The NEPCMs modified by the sol-gel method (C 14 @MUF–TiO 2 -S1) exhibited the best performance in terms of the encapsulation ratio, melting enthalpy , and onset decomposition temperature , which were 68.6%, 156.2 J·g -1 , and 155.36 °C, respectively. C 14 @MUF–TiO 2 -S2 exhibited the lowest mass loss of 44.2% at 100 h. For the blending method, C 14 @MUF–TiO 2 -B1 had the highest yield of 53.87%. The thermal conductivity of C 14 @MUF–TiO 2 -B3 increased up to 88.15% compared with the unmodified NEPCMs. Therefore, modification by the sol-gel method with 2.2 g TiO 2 sol had the highest total efficacy coefficient of 0.843 among the samples.
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高影响因子
Frontiers in Materials
·
2021
·
IF 3.515
Lin Peng,Xu Yuchen,Hou Junfeng,Zhang Xiaochun,Ma Lingfei,Che Wenbo,Yu Youming
Bamboo is a rich natural resource in the Asia Pacific, and it is widely used in the construction and decoration industry. Meanwhile, bamboo is an extremely combustible natural polymer material. Herein, the bamboo slices were treated with melamine and phytic acid using layer-by-layer (LBL) assembly technology to improve their flame retardancy properties. The morphology and chemical composition of untreated and treated bamboo slices were measured by scanning electron microscopy equipped with energy dispersive X-ray analysis and Fourier transform infrared spectra. The results showed that two-dimensional melamine–phytate (MP) nanoflakes were successfully formed and deposited on the bamboo surface. The deposition of the MP coating caused the earlier degradation of the bamboo to form char, according to thermogravimetric analysis. The peak heat release rates of the treated bamboo slices were reduced by more than 28% compared to those of the untreated ones. The MP coating promoted the formation of thermally stable char, which was responsible for the significant improvement in flame retardancy. Besides, the char layer with excellent thermal resistance performed a vital role in suppressing flame spread.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Wenjing Yuan,Haitao Liu,Xihua Wang,Li Huang,Fuxing Yin,Ye Yuan
With the rapid development of wireless communication and electronic devices, current electromagnetic interference (EMI) shielding materials cannot meet the demands of smart EMI shielding in the next generation of electronic equipment. Herein, we developed an intelligent EMI shielding switch to realize microwave shielding and transmitting functions for one material simultaneously. The EMI shielding switch is composed of MXene/melamine sponge, and 3D printed resin base. The EMI shielding switch can smartly regulate its absorption-dominant EMI SE from ~0 dB to ~43.1 dB in S-band through simply operation, to fully realize microwave transmitting and shielding functions simultaneously. The EMI shielding switch provides a novel way to fabricate efficient EMI shielding materials for actual wireless communication demands.
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高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Shanshan Xu,Lu Qi,Chao Ma
Despite their great potential use in various textiles, cellulose viscose fibers are poor in tensile strength, thus hindering their practical application. In this work, viscose fiber with high tensile strength was prepared through in-situ functionalization with p-hydroxybenzaldehyde melamine-formaldehyde resin (PMfr). The successful incorporation of PMfr into the viscose fiber was proven by FT-IR and nitrogen content analysis. The introduction of PMfr can build up a polymeric network with fiber through cross-linking interactions, enabling the tensile strength of the PMfr@viscose fiber to increase from 1.90 to 2.4 cN/dTex. The results suggest that the strategy of incorporating PMfr into the viscose fiber is very efficient in enhancing its tensile strength, which may also have the potential to improve the mechanical properties of other fibers.
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高影响因子
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