JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 5
·3900-3910
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IF 3.553
Liu Xufei,Qiu Shengqiang,Mei Peng,Zhang Qing,Yang Yingkui
Organic polyimides have received an ever-growing interest in lithium-ion batteries based on the reversible anion stabilization mechanism of redox-active carbonyl groups due to their high theoretical capacities, resource sustainability, and diverse chain structures. Herein, four linear polyimides with different chain structures were synthesized by a facile and green hydrothermal method. The chain structure-electrochemical performance relationship was explored by regulating active anhydride units and diamine linkers. The incorporation of flexible linkers between redox-active anhydrides results in the facile movement of polyimide chains and the formation of porous networks with abundant active sites. In contrast, rigid aromatic linkers with strong π – π conjugation tend to assemble into the orderly-stacked sheets, enabling the efficient electron transfer. When used as the battery cathode, 1,4,5,8-naphthalenetetracarboxylic dianhydride-based polyimide with a relatively flexible linker delivers the largest specific capacity. Such a polyimide also demonstrates the high cycling stability with a capacity retention up to 52% over 10000 cycles. In contrast, pyromellitic dianhydride-based polyimide with a benzene-enriched linker exhibits the lowest capacity and poor rate capability due to its densely-stacked sheets and limited exposure of active groups. The chain structure-dependent performance relationship of polyimides would offer new insights into the rational design of high-performance organic electrodes for the next-generation batteries.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 3
·1-9
·
IF 5.833
Si Tiantian,Wang Shuai,Zhang Haixia,Wang Licheng,Lu Xiaofeng,Liang Xiaojing,Guo Yong
A general method was developed for preparing a metal–organic framework–polymer composite coated silica core–shell stationary phase. Silica microspheres were comodified with metal–organic framework and polyvinylpyrrolidone rather than the in situ method of silica modification by original metal–organic framework particles. Metal–organic framework particles and polyvinylpyrrolidone on silica surface were beneficial to suppress silanol activity and enhance composite material tolerance, as well as increasing the water compatibility of the original metal–organic framework-based stationary phases. The stationary phase exhibited superior hydrophilic and hydrophobic performance in terms of separation for various analytes including seven alkaloids, six sulfonamides, five antibiotics, and five polycyclic aromatic hydrocarbons. Moreover, the composite material also showed excellent stability with the relative standard deviation of the retention time of 0.4 to 0.7%. The separation performance with real samples proved that the column has good practical application potential. In summary, the poposed method provides a general way for preparing metal–organic framework–polymer composite material and changed the current status of original metal–organic framework particles modified silica as a single mode chromatographic stationary phase. Graphical abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 22
·28024-28037
·
IF 4.223
Lv Yuancai,Yu Jianying,Huang Siyi,Zheng Kaiyun,Yang Guifang,Liu Yifan,Lin Chunxiang,Ye Xiaoxia,Liu Minghua
Considering the high environmental risk, the remediation of antibiotic pollutants attracted numerous attentions. In this work, a novel photocatalyst, Ce 0.9 Zr 0.1 O 2 /SnIn 4 S 8 , was fabricated by in situ precipitation and hydrothermal method and then applied to the degradation of norfloxacin under the irritation of visible light. The SEM, TEM, XRD, XPS, and electrochemical results clearly showed that the n-type heterojunction between Ce 0.9 Zr 0.1 O 2 and SnIn 4 S 8 was successfully constructed, which greatly reduces the recombination of the photogenic electron and holes, leading to the improvement of photocatalytic performance and stability (recycled over eight times). Besides, the Ce 0.9 Zr 0.1 O 2 /SnIn 4 S 8 composite also exhibited good ability to mineralize norfloxacin. Under the optimal condition (pH 3, 1 g L −1 of 10% Ce 0.9 Zr 0.1 O 2 /SnIn 4 S 8 , and 8 mg L −1 of initial norfloxacin concentration), norfloxacin could be fully and rapidly degraded in 60 min, and completely mineralized in 4 h (99.3 ± 1.7%). LC-QTOF-MS results evidently displayed eight intermediates during norfloxacin degradation. In addition, with the attack of the reactive oxygen species (h + , •OH, and •O 2 − ), norfloxacin could be effectively decomposed via deoxygenation, hydroxylation, and carboxylation reactions. Notably, compared to photodegradation, the photocatalytic process could completely eliminate the norfloxacin from water because it could avoid the accumulation of toxic byproducts.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 1
·1-12
·
IF 2.253
Zhang Gongguo,Liu Zhiang,Fu Xiaowei,Zhao Wenjun,Yin Xunxiao,Niu Xiankang,Kong Rongmei,Qu Fengli,Zheng Yiqun
Branched Au nanocrystals with sub-10-nm arms are synthesized via a one-pot reduction in aqueous phase. The success of current work relies on the use of octadecyltrimethylammonium chloride as the shape-directing capping agent to facilitate the formation of branched products in high purity. Their overall size could be controlled in the range of 16–60 nm by varying the Au precursor amount or concentration of capping agent, and the diameter of arms is limited to sub-10-nm size range. Interestingly, Au nanocrystals with a unique morphology, sheet-wrapped dendrites, could be obtained when the concentration of a reductant was varied. The current strategy is also validated effective in the fabrication of dendritic products composed of other noble metals or alloys in addition to Au by simply using the alternative metal precursor. As compared to spherical counterparts, the current branched Au nanocrystals exhibited noticeable red-shift in UV-Vis extinction spectrum and enhanced catalytic activities for electrooxidation of ethanol in alkaline media. Graphical abstract
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Nature Communications
·
2021
·Vol. 12
·期 1
·1-10
·
IF 14.919
Li Xiangyu,Liu Jingjing,Qu Ruixiang,Zhang Weifeng,Liu Yanan,Zhai Huajun,Wei Yen,Hu Hanshi,Feng Lin
Superwetting porous membranes with tunable liquid repellency are highly desirable in broad domains including scientific research, chemical industry, and environmental protection. Such membranes should allow for controllable droplet bouncing or spreading, which is difficult to achieve for low surface energy organic liquids (OLs). Here we develop an interfacial physical parameter to regulate the OL wettability of nanoparticle-embedded membranes by structuring synergistic layers with reconfigurable surface energy components. Under the tunable solid-liquid interaction in the aggregation-induced process, the membranes demonstrate positive/negative liquid gating regularity for polar protic liquids, polar aprotic liquids, and nonpolar liquids. Such a membrane can be employed as self-adaptive gating for various immiscible liquid mixtures with superior separation efficiency and permeation flux, even afford successive achievement of high-performance in situ extraction-back extraction coupling. This study should provide distinctive insights into intrinsic wetting behaviors and have pioneered a rational strategy to design high-performance separation materials for diverse applications.
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Journal of Nanostructure in Chemistry
·
2021
·Vol. 11
·期 3
·353-366
·
IF 6.391
Zhang Mengmeng,Zhao Wenjing,Zhang Xia,Li Zhiwei,Yu Laigui,Li Xiaohong,Zhang Zhijun
Abstract With the development of modern engineering technology, the development of high-performance and multifunctional polymer materials has been promoted. In this work, a novel nanohybrid based on chitosan engraved zinc and iron mixed oxyhydroxide at the presence of halloysite nanotubes (HNTs) as the carrier, followed by surface capping with stearic acid to obtain super-hydrophobic HNT@CSZFMOH nanofiller. The as-obtained HNT@CSZFMOH nanofiller was incorporated into epoxy resin (EP) matrix. With the addition of 3 wt.% HNT@CSZFMOH, the peak heat release rate and peak smoke production of the EP nanocomposite decreased by 35% and 32%, respectively. This excellent flame retardancy is attributed to that the enhanced physical barrier derived from HNT@CSZFMOH, and the dense, highly graphitized char layer formed by catalytic charring of ultrafine FeOOH and ZnOOH nanoparticles. Meanwhile, the nanohybrid imparted outstanding hydrophobicity to the hydrophilic substrate EP with the water contact angle (CA) of 159°. EP-matrix nanocomposite exhibited desired self-cleaning performance as well as good resistance against corrosive liquids (acid and alkaline solutions) and ultraviolet irradiation. The present approach, with simple procedures and desired environmental acceptance, could provide feasible pathway to fabricating multifunctional polymer–matrix composites. Graphic Abstract
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Food Analytical Methods
·
2021
·Vol. 14
·期 4
·814-822
·
IF 3.366
Chen Yisheng,Huang Caihong,Xu Xueming
In recent years, there was increasing concerns on food safety issues associated with fluorescent whitening agents from package materials. Here, we reported the development of a facile and reliable method suitable for high-throughput quantification and identification of two common fluorescent whitening agents (FWA 184 and FWA 367) in cereal products (wheat and rice flour), platformed by high-performance thin-layer chromatography. First, the sample preparation and cleanup were rapidly accomplished via an optimized solid–liquid extraction. The extracts and reference standard were simultaneously separated on silica gel plates, using the mixture of toluene and ethyl acetate (10/0.3, v/v) as the mobile phase. Then, rapid quantification was performed with densitometry in fluorescent mode (365
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CELLULOSE
·
2020
·Vol. 28
·期 1
·289-300
·
IF 4.21
Lin Yamei,Asante Frimpong Obed,Xu Xiao,Li Shouhai,Ding Haiyang,Xu Lina,Yang Xiaohua,Xia Jianling,Li Mei
Abstract Biobased lipoic acid (LA) can be used as a plasticizer and combine with ethyl cellulose (EC) to form ethyl cellulose supramolecular composite films.
The morphology, hydrophilic performance, thermal stability and mechanical properties of the composite films were investigated. The introduction of LA can significantly improve the flexibility and processability of ethyl cellulose films because LA can weaken both hydrogen bonding and hydrophobic interaction in EC chains. The elongation at break of EC composite films can be increased by 5.5~11.1 times when the LA content is 20~50%. In addition, comparative experiments and molecular dynamic simulations were performed to explain the superiority of LA as a plasticizer for EC films. Graphic abstract
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International Journal of Environmental Research
·
2020
·Vol. 15
·期 1
·1-10
·
IF 2.007
Ye Yuxuan,Wan Jun,Li Qiang,Huang Yangbo,Pan Fei,Xia Dongsheng
The effective treatment of dyeing wastewater has been considered as one of the challenges. The sulfate radical (SO 4 •− )-based technology exhibited great potential in the field of organic wastewater treatment. In this study, copper oxide was synthesized and used to activate persulfate (PS) for removing methylene blue (MB) from aqueous solution. The effects of reaction parameters and coexisting substances on this process were studied. Under the optimal conditions ([CuO] = 0.2 g/L, [PS] = 2 g/L, pH = 7.0–9.0), more than 90% of MB was degraded. Cl − had little effect on MB removal, while SO 4 2− and HCO 3 − showed inhibitory effect. The activation energy of the reaction was 137.8 kJ/mol at 25 ℃ with an initial MB concentration of 10 mg/L. The mechanisms of PS activated by CuO was elucidated by radical scavenger and electron spin resonance trapping studies. The results found that sulfate radical (SO 4 · − ) and singlet oxygen ( 1 O 2 ) were the primary reactive oxygen species in the CuO/PS system. The recycling experiments showed that MB removal efficiency remained more than 70% after five cycles, which exhibited good stability and high efficiency of the catalyst. The favorable degradation performance of simulated textile wastewater indicated the potential application of CuO/PS for dyeing wastewater treatment.
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Nature Communications
·
2020
·Vol. 11
·期 1
·1-9
·
IF 12.121
Li Hongdong,Han Yi,Zhao Huan,Qi Wenjing,Zhang Dan,Yu Yaodong,Cai Wenwen,Li Shaoxiang,Lai Jianping,Huang Bolong,Wang Lei
Designing electrocatalysts with high-performance for both reduction and oxidation reactions faces severe challenges. Here, the uniform and ultrasmall (~3.4 nm) high-entropy alloys (HEAs) Pt 18 Ni 26 Fe 15 Co 14 Cu 27 nanoparticles are synthesized by a simple low-temperature oil phase strategy at atmospheric pressure. The Pt 18 Ni 26 Fe 15 Co 14 Cu 27 /C catalyst exhibits excellent electrocatalytic performance for hydrogen evolution reaction (HER) and methanol oxidation reaction (MOR). The catalyst shows ultrasmall overpotential of 11 mV at the current density of 10 mA cm −2 , excellent activity (10.96 A mg −1 Pt at −0.07 V vs. reversible hydrogen electrode) and stability in the alkaline medium. Furthermore, it is also the efficient catalyst (15.04 A mg −1 Pt ) ever reported for MOR in alkaline solution. Periodic DFT calculations confirm the multi-active sites for both HER and MOR on the HEA surface as the key factor for both proton and intermediate transformation. Meanwhile, the construction of HEA surfaces supplies the fast site-to-site electron transfer for both reduction and oxidation processes.
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Optoelectronics Letters
·
2020
·Vol. 16
·期 6
·401-404
·
IF 0
Li Shi-na,Ma Rui-xin,Niu Jian-wen
Cu 2 NiSnS 4 nanoparticles were prepared for the first time using a facile solid-phase process at a temperature of 180°C. The crystalline structure, morphology and optical properties of the Cu 2 NiSnS 4 nanoparticles were characterized by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM) and ultraviolet-visible (UV-vis) spectrophotometer. The band gap and conversion efficiency of Cu 2 NiSnS 4 nanoparticles were studied at various temperature. The results showed that the Cu 2 NiSnS 4 nanoparticles exhibited an optimum band gap of 1.58 eV and a conversion efficiency of 0.64% at 180 °C, indicating that it maybe be useful in low-cost thin film solar cells.
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IRANIAN POLYMER JOURNAL
·
2021
·Vol. 30
·期 4
·401-410
·
IF 1.899
Sun Dewen,Hou Pingping,Li Bo,Zhang Xiaodong
A series of catechol-modified epoxy resin biomimetic coatings (CE- X , X represents the weight fraction of catechol-modified epoxy resin, X = 0, 5%, 10%, 15%, 20%, 25%) with high adhesive strength on saturated concrete substrate were designed and synthesized. The chemical structures of the CE- X were confirmed by proton nuclear magnetic resonance ( 1 H NMR), carbon-13 nuclear magnetic resonance spectroscopy ( 13 C NMR), and Fourier transform infrared spectroscopy (FTIR). The thermal property of CE- X was characterized by thermogravimetric analysis (TGA). The adhesive properties were characterized by pull-off tests. Results showed that when the content of catechol–epoxy resin was under 20% by weight, the adhesive strength could be further increased by forming hydrogen bonds and coordination complexes in the interface of coating and saturated concrete of the substrate. When the content of catechol–epoxy resin was above 20% by weight, the pull-off tests showed cohesive failure, and the adhesive strength on saturated concrete substrate reached the maximum value of 4.61 ± 0.8 MPa, which was improved by ~ 3 MPa compared to that of the control sample. The adhesive properties of epoxy coatings on saturated concrete substrate could be improved by adding a proper amount of catechol groups. In addition, when it was immersed in water for 30 and 120 days, its adhesive strength was reduced by about 7.8% and 22%, respectively. This work provides a new method for designing and synthesizing protective coatings with high adhesive strength on the saturated concrete substrate. Graphic abstract
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危险品化学品经营许可证（带存储）