JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·
IF 1.5
Liu Nana,Xu Yunan,Zhan Chenghua,Li Yahe,Yuan Yijun
Uranium extraction from seawater is urgently required for the sustainable development of nuclear industry. Herein, the application potential of Thalassiosira pseudonana adsorbing U(VI) was examined. A 0.3 g L −1 adsorbent dose at an initial uranium concentration of 8 ppm, pH 5.0, and a contact time of 8 h achieved maximum U(VI) adsorption (23.75 mg g −1 ) at 298 K. The adsorption process was a chemisorption phenomenon, characterized by homogeneous monolayer adsorption. The adsorbents exhibited high hydrophilicity, with –OH and –COOH being the main functional groups for uranium adsorption. T. pseudonana had excellent regeneration performance and high sorption selectivity. The research denoted T. pseudonana is an effective and promising sorbent for extracting uranium from seawater.
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高影响因子
JOURNAL OF CLUSTER SCIENCE
·
2022
·Vol. 34
·期 1
·373-383
·
IF 3.447
Zhang Yaping,Yang Hua,Cao Peiyu,He Yufeng,Zhao Yuxuan,Song Pengfei,Wang Rongmin
The hydrophilic Ti 3 C 2 , typical MXenes containing surface functional groups, possess excellent conductivity, was mainly applied in supercapacitors. However, it had not obvious photocatalytic and antibacterial activity because of high electron hole-pair recombination rate and concentration dependence. In this work, a novel MXenes-based Schottky junction (UiO-NH 2 @TiC) was fabricated by a simple solvothermal method using Ti 3 C 2 as the conductive carrier and UiO66-NH 2 as positively charged nano-MOFs (metal organic frameworks). After verifying the synthesis of UiO-NH 2 @TiC by SEM (scanning electron microscopy), EDS (energy dispersive spectrometer), XRD (powder X-ray diffraction), and FT-IR (Fourier transform infrared spectroscopy), its photochemical properties were also measured. Then, the photocatalytic antibacterial activity and the photodegradation behavior were investigated. The results indicated that UiO-NH 2 @TiC Schottky junction could not only remove the remaining antibiotics in wastewater (91%), but also effectively inhibited the growth of bacteria, and the inhibition rate of E. coli ( Escherichia coli ) and S. aureus ( Staphylococcus aureus ) more than 95% under visible light irradiation. In summary, it is an effective strategy for constructing functional Schottky junction. What’s more, the obtained Schottky junction has great potential in practical application.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 2
·1-8
·
IF 1.784
Bi Yong-guang,Liu Di
The effect of calcination temperature and catalyst dosage on degradation rate of methyl orange has been investigated and 0.04 g TiO 2 with 700 °C calcination temperature was selected as the object of doping due to its higher degradation efficiency (99% in less than 1 h), Fe 3 O 4 modified with citric acid was used to improve the recovery and reuse of catalyst, the effect of doping amount of Fe 3 O 4 on the photo-catalytic efficiency of methyl orange has been discussed, and the results showed that the methyl orange degraded above 97% with 20 mg Fe 3 O 4 doped into TiO 2 when the TiO 2 @Fe 3 O 4 was used three times. The particles were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photo-electron spectroscopy; the magnetic properties were measured by PPMS-DynaCool type vibrating magnetometer; the composite showed excellent magnetic response with saturation magnetization of 9.5 emu g −1 . Zeta-potential analysis indicated that TiO 2 (3.6 mV) and Fe 3 O 4 (− 16.8 mV) are linked by electrical attraction, demonstrating that doping of Fe 3 O 4 is beneficial to the recycle and reuse of catalyst and improves the photo-catalytic efficiency, and TiO 2 @Fe 3 O 4 is suitable for industrial production.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2011
·Vol. 47
·期 2
·711-719
·
IF 1.859
Jin Quan,Zheng Mingtao,Wu Yongjian,Xie Chunlin,Xiao Yong,Liu Yingliang
A facile approach was developed for synthesis of carbon hollow microspheres (CHM) via carbonization of the hollow polymer microspheres prepared from polymerization in the presence of l -lysine acted as in situ template. The physical and chemical structures of the samples were investigated by X-ray powder diffraction, Raman spectrum, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). SEM and TEM images show that the products consist of a large scale of monodisperse CHM with a size of about 1.1–1.3 μm. Furthermore, the resulting CHMs possess a surface area of 559 m 2 g −1 and a pore volume of 0.27 cm 3 g −1 . The morphology and the size of the as-obtained samples can be controlled by the polymerization temperature, polymerization time, and the dosage of l -lysine. Moreover, a possible formation mechanism of the CHM has been put forward according to the experimental data available.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2018
·Vol. 124
·期 10
·1-7
·
IF 1.604
Xie Tian,Sun Fugen,Zhou Xiaoqing,Liu Li,Liu Zhenyuan,Liu Liekai,Wu Zilong,Yue Zhihao,Zhou Lang,Tang Hao
Material synthesis plays an important role in determining the performance and cost of final devices. In this paper, rheological phase method has been applied to conveniently synthesize carbon-coated LiNi 0.6 Co 0.2 Mn 0.2 O 2 (LNCM622/C) as the cathode material of high-performance lithium-ion batteries (LIBs), avoiding the use of co-precipitation route with complicated procedures and environmental issues. Importantly, the addition of citric acid enabled a relative low temperature of crystallization initiation of the reaction of forming LNCM622/C, which is crucial for the material synthesis. As a result, highly ordered LNCM622/C materials have been obtained with a final calcinating temperature of 900 °C, which is comparable to that being used in co-precipitation route. It is worth mentioning that the synthesis reaction was processed in air without the extra-oxygen gas supply. By varying lithium contents (Li/TM = 0.95, 1.00, 1.05, 1.10, 1.15, and 1.20 by molar, TM = Ni, Co, and Mn), the structure and morphology of resulted LNCM622/C materials were changed, leading to different electrochemical performances of corresponded LIBs. It was found that the Li/TM = 1.15 sample had the best initial discharged capacity at 0.1 °C rate (177.1 mAh g − 1 ), whereas the Li/TM = 1.05 sample showed the best cycling and rate performance (100.6 mAh g − 1 at 1 °C) among synthesized samples. Overall, these results suggest that rheological phase method can be considered as an effective route for synthesizing carbon-coated LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathode materials for high-performance LIBs.
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·Vol. 42
·期 10
·1578-1588
·
IF 4.1
Li Meng,Zhang Meng-Yuan,Lei Wu-Xuan,Lv Zhu-Ting,Shang Qing-Hua,Zhao Zheng,Li Jiang-Tao,Cheng Yi-Long
The development of physically crosslinked hydrogels with excellent mechanical and sensing properties is of importance for expanding the practical applications of intelligent soft hydrogel materials. Herein, after copolymerization of hydroxyl-containing amino acid derivative N-acryloyl serine (ASer) with acrylamide (AM), we introduce Zr 4+ through an immersion strategy to construct metal ion-toughened non-covalent crosslinked hydrogels (with tensile strength of up to 5.73 MPa). It is found that the synergistic coordination of hydroxyl and carboxyl groups with Zr 4+ substantially increases the crosslinking density of the hydrogels, thereby imparting markedly superior mechanical properties compared to hydroxyl-free Zr 4+ -crosslinked hydrogels, such as N-acryloyl alanine (AAla) copolymerized with AM hydrogels (with tensile strength of 2.98 MPa). Through the adjustment of the composition of the copolymer and the density of coordination bonds, the mechanical properties of the hydrogels can be modulated over a wide range. Additionally, due to the introduction of metal ions and the dynamic nature of coordination bonds, the hydrogels also exhibit excellent sensing performance and good self-recovery properties, paving the way for the development of flexible electronic substrates with outstanding comprehensive performances.
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高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2021
·Vol. 147
·期 7
·4597-4610
·
IF 4.626
Dou Yanli,Li Xuefei,Zheng Kaiyue,Liu Jiawen,Hou Jiazi
A UV-curing flame-retardant coating with varying mass content of bisphenol A epoxy acrylate (BAEA), 2-hydroxyethyl methacrylic acid phosphate (PM-2) and polyurethane acrylate (PUA) were prepared, improving the flame-retardant and mechanical properties of jute/polypropylene (PP) composites. BAEA is the main film-forming prepolymer. Phosphate ester groups in PM-2 can promote the formation of carbon layer during combustion, and PM-2 can also be used as a good adhesion binder to improve the coating adhesion levels. The flexible long chain in PUA could reduce the shrinkage of the coating and provide further adhesion. To avoid the oxygen inhibition of the radical polymerization, isopropylthioxanthone and triethanolamine were used to reduce the reaction between photoinitiator phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide and oxygen. Compared to the uncoated composites (J–P), the peaks of heat release rate and total smoke production of coated composites decreased and limiting oxygen index values increased significantly, which revealed that the coatings showed effective fire protection effect. The bending strength of the coated composites can increase by 90% over uncoated sample J–P. This simple, low-cost and environmentally friendly UV-curing coating has good adhesion and can effectively improve the flame-retardant and mechanical properties of composites, which expand application of the flame-retardant fiber composites.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 10
·1-9
·
IF 2.983
Zhang Yawen,Ding Huizhen,Yan Bin,Lin Pei,Wu Di,Shi Zhifeng,Chen Xu,Tian Yongtao,Li Xinjian
Recently, highly flexible strain sensors have been widely studied based on the conductive polymer composites, due to their potential applications in wearable electronics, soft robots, and human–machine interfaces. Herein, we fabricate the flexible MWCNT line/Ecoflex strain sensors by 3D printing technology to investigate the effects of preparation conditions on the performance of sensors, and find that gage factor (GF) of such sensors is effected by concentration of MWCNT/IPA solution and curing time of Ecoflex pre-polymer film. Among the obtained samples, the sensor prepared by 2 wt% MWCNT/IPA solution with curing time of 12 min has the highest gage factor, about ~ 23.87. The sensors can detect or monitor subtle motions of facial muscle, breath and pulse, and possess wide linear range besides good repeatability and excellent durability. Meanwhile, the prepared sensors were designed into a 4 × 4 array, and the array achieved monitoring of spatial distribution of the applied pressure. Our strategy could be used to fabricate flexible strain sensors with wide linear range, which facilitate further integration to achieve potential applications in detection of human activity, electronic skin, and soft robots.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 2
·701-712
·
IF 3.442
Yang Wangyang,Shen Honglie,Min Huihua,Ge Jiawei
In recent years, Ti 3+ self-doped TiO 2 (B-TiO 2 ) exhibits great potential as a photocatalyst. In this work, Ti vapor-assisted annealing is first demonstrated for Ti 3+ doping and improving the visible absorption of TiO 2 . TEM results exhibit the formation of disordered layer, indicating the successful fabricating of B-TiO 2 . The absorption increase in TiO 2 caused by Ti vapor annealing reaches nearly 50% in the visible wavelength range. Benefiting from the absorption increase, the photocatalytic performance of TiO 2 after Ti vapor annealing increases by 60–70%. Surface modification of Ag onto B-TiO 2 is also carried out to further improve its optical property. Ag-modified Ti 3+ self-doped TiO 2 (B-TiO 2 @Ag) exhibits great visible photodegradation behavior to RhB. The RhB degradation rate reaches 97.76% after 60 min of visible light irradiation. Electrochemical performance tests demonstrate that as-prepared TiO 2 @Ag has lower resistance than W-TiO 2 . The results indicate that B-TiO 2 @Ag has great potential in solar photocatalytic degradation of pollutant.
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高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2019
·Vol. 141
·期 4
·1341-1350
·
IF 2.471
Liu Hao,Wu Hongjuan,Song Qingyi,Zhang Jingyi,Li Weihao,Qu Hongqiang
Polyphosphate (copper polyphosphate: CuPPA, zinc polyphosphate: ZnPPA, cobalt polyphosphate: CoPPA and nickel polyphosphate: NiPPA) was used as surface modifiers, smoke suppressants and flame retardants to modify the magnesium hydroxide (MH). Core–shell flame retardants composed of transition metals (Cu, Zn, Co, Ni) and P were prepared. The morphology, chemical composition and structure of core–shell flame retardants were characterized by scanning electron microscopy, Fourier-transform infrared spectrum and X-ray diffraction. Compared with MH, the core–shell flame retardant endows EVA resin with better flame retardant, smoke suppression and mechanical properties. Under the same loading of flame retardant, the peak heat release rate, total heat release and CO production of EVA + Cu decreased by 41.45%, 7.51% and 54.84%, respectively, and the mass residue increased by 12.42%. These improvements can be attributed to the catalytic carbonation of transition metal compounds and better protection of char layer formation. The synergistic effect between polyphosphate and MH was discussed. Due to the extensive synergy between flame retardant metal ion and polyphosphate group, it had a potential application prospect in the preparation of various flame retardant polymers.
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高影响因子
FIBERS AND POLYMERS
·
2021
·Vol. 22
·期 1
·141-148
·
IF 2.153
Jia Weini,Li Shirong,Luo Zhengxin,Yu Hainan,Zhu Wenjun,Mao Qinghui,Zhang Xiaoli,Liang Zhijie,Dong Aixue
Due to the damage of scalp because of chemical dyes, increasing attention had been paid to the ecological dyeing of human hair. To address the need for ecological restoration and dyeing of human hair, herein, a novel approach has been proposed via laccase-mediated in situ oxidation of dihydroxy phenylalanine (dopamine). As laccase can catalyze dopamine oxidation and then polymerization to produce strongly colored polymers, different biological coloration processes of human hair based on this process were investigated: (i) Human hair was treated with laccase alone; (ii) The absorption of human hair with dopamine, followed by further catalysis of air; (iii) The absorption of human hair with dopamine, followed by further catalysis of laccase; (iv) Simultaneous laccase-mediated polymerization and dyeing of human hair; and (v) Polymerization of Dopamine with laccase and then dyeing human hair. The surface properties of dyed hair were evaluated in terms of ultraviolet (UV)-protection, color fastness, Fourier transforming infrared spectrum (FT-IR), optical microscope, and scanning electron microscopy (SEM). The results show that best hair dyeing effect was achieved via simultaneous laccase-mediated polymerization and dyeing. The dyed hair obtained K/S values of 28, light fastness of level 5, and UPF of 100 + . The optical microscope and SEM observations show that the surface of colored hair fibers was covered with thin burrs, which can be attributed to polydopamine attached with physical adhesive force and covalent reaction. FT-IR analysis shows that functional groups were present on the surface of the dyed hair which can be considered as introduction of hydroxyl radical groups. This biological stain technique may be widely used in dyeing of hair with black color.
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高影响因子
CHROMATOGRAPHIA
·
2024
·
IF 1.2
Chen Shaoman,Li Xican,Li Chunhou,Cai Rongxin,Chen Ban,Jiang Guihua,Liang Yongbai,Chen Xu
Violae herba (Zihuadiding) is a common Chinese herbal medicine. The current Chinese Pharmacopeia (ChP) defines Viola yedoensis Makino as the sole plant origin and esculetin as its sole quality-marker (Q-marker). Esculetin, however, occurs in some counterfeits as well. This implies that current ChP criterion actually cannot recognize the counterfeits of V. yedoensis . The study thus created a specialized MS library using ultra-high-performance liquid chromatography with quadrupole-orbitrap tandem mass spectrometry (UHPLC- Q -Orbitrap-MS/MS) analysis. Through library-comparison, 36 compounds were putatively identified from V. yedoensis ; especially, four isomers were successfully distinguished, that is, vitexin vs isovitexin and schaftoside vs isoschaftoside. The subsequent UHPLC- Q -Orbitrap-MS/MS semi-quantification suggested that the chemical contents of 36 compounds varied from 0.001 to 1.958% and the old Q-marker esculetin had high content (0.484 ± 0.028%). According to the relevant principles, flavonoid luteolin was proposed as the new and additional Q-marker. The proposal offers a preliminary evidence to recognize seven adulterations (or counterfeits) of V. yedoensis .
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高影响因子
危险品化学品经营许可证（带存储）