Journal of Inorganic and Organometallic Polymers and Materials
·
2013
·Vol. 23
·期 6
·1451-1458
·
IF 1.174
Yu Xiaoke,Weng Wandan,Guo Xiaxia,Zheng Yueqing
Two polymeric carboxylato-bridged manganese(II) complexes, \( {}_{\infty }^{1} \) [Mn(bpe)(NBA) 2 ] ( 1 ) and \( {}_{\infty }^{1} \) [Mn(bpe)(MBA) 2 ] ( 2 ) (bpe = 1,2-di(4-pyridyl)ethylene; HNBA = m-nitrobenzoic acid; HMBA = m-methyl-benzoic acid), were synthesized and characterized. Compounds 1 and 2 are isostructural. X-ray diffraction studies show that the title compounds possess a double chain structure. The chains in 1 and 2 are assembled into 2-D layers via C–H···O hydrogen bonds interactions. Furthermore, owing to the offset face-to-face π–π stacking interactions, the adjacent 2-D layers embed into each other to form a 3-D supramolecular framework. Variable-temperature (2–300 K) magnetic susceptibility measurements show the presence of weak antiferromagnetic interactions between the high-spin Mn(II) (S = 5/2) ions through a carboxylato bridge with the best fit parameters for 1 being J = −0.13 cm −1 , zJ′ = −0.098 cm −1 and for 2 , J = −0.33 cm −1 , zJ′ = −0.001 cm −1 .
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International Journal of Minerals Metallurgy and Materials
·
2020
·Vol. 27
·期 12
·1687-1694
·
IF 1.713
Tian Dong-hua,Han Zhen-chao,Wang Ming-yong,Jiao Shu-qiang
Graphite materials are widely used as electrode materials for electrochemical energy storage. N-doping is an effective method for enhancing the electrochemical properties of graphite. A novel one-step N-doping method for complete and compact carbon paper was proposed for molten salt electrolysis in the LiCl-KCl-Li 3 N system. The results show that the degree of graphitization of carbon paper can be improved by the electrolysis of molten salts, especially at 2.0 V. Nitrogen gas was produced at the anode and nitrogen atoms can substitute carbon atoms of carbon paper at different sites to create nitrogen doping during the electrolysis process. The doping content of N in carbon paper is up to 13.0wt%. There were three groups of nitrogen atoms, i.e. quaternary N (N-Q), pyrrolic N (N-5), and pyridinic N (N-6) in N-doping carbon paper. N-doping carbon paper as an Al-ion battery cathode shows strong charge-recharge properties.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 5
·3682-3691
·
IF 2.599
Chang Meng-Jie,Wang Hua,Li Hui-Lu,Liu Jun,Du Hui-Ling
A novel magnetic Fe 2 O 3 /BiOI hybrid nanostructure was fabricated by combining electrospinning and successive ionic layer adsorption and reaction (SILAR) method. Hollow Fe 2 O 3 nanofibers with internal diameter around 50 nm were produced by using electrospinning and calcinations of the as-spun fibers at 450 °C for 2 h. BiOI was deposited on the Fe 2 O 3 nanofiber surface by SILAR method, and the BiOI quantity could be controlled by the growth cycles of SILAR. Similar synthetic procedure could also be used to prepare Fe 2 O 3 /BiOBr and Fe 2 O 3 /BiOCl hybrid nanostructures. The BiOI on the magnetic nanofiber surface is highly crystalline with lamellae morphology of around 16 nm in thickness from the X-ray diffraction and scanning electron microscopy detections. The obtained Fe 2 O 3 /BiOI hybrid nanostructures exhibit superior visible light catalytic performance toward decomposition of RhB. This new method, which can also be used to prepare other magnetic photocatalyst simply at low cost, is suitable for practical applications.
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TRANSITION METAL CHEMISTRY
·
2019
·Vol. 45
·期 1
·31-39
·
IF 1.016
Wang Longgang,Zhang Xuan,Cui Yanshuai,Guo Xiaolei,Chen Shengfu,Sun Haotian,Gao Dawei,Yang Qinghua,Kang Jianxin
Abstract Noble metal nanoparticles have been drawing great attention for the treatment of water pollutants. The catalytic activity of noble metal nanoparticles is usually reduced due to their aggregation. Amphiphilic molecule micelles have potential to stabilize the noble nanoparticles against aggregation. In this study, a novel facile method was reported for preparing polyethyleneimine-oleic acid (PEI-oleic acid) micelle-stabilized gold nanoparticles (PO-AuNPs n ), where the gold nanoparticles (AuNPs) were embedded in the shell area of micelles. When the molar ratio of [N] to [Au] was 50, 100, and 200, the mean diameter of AuNPs was 3.52 ± 0.42, 3.11 ± 0.28, and 2.85 ± 0.48 nm, respectively. The corresponding zeta potential of the PO-AuNPs n was determined to be 26.2, 28.9 and 35.7 mV, respectively. Furthermore, PO-AuNPs n remained stable in aqueous solution at room temperature for more than 1 month. More importantly, PO-AuNPs n had higher catalytic activity for 4-nitrophenol (4-NP) reduction in aqueous solution compared with previous reports, where PO-AuNPs 200 showed a K nor value of 9367 s −1 g −1 . It is believed that PO-AuNPs n showed high catalytic activity because of their small size, high stability, and the location of AuNPs in the shell area, which made it easier for AuNPs to contact with 4-NP. The method described in this report represents a new method to prepare small and stable noble metal nanoparticles for catalytic applications in the future.
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CATALYSIS LETTERS
·
2018
·Vol. 148
·期 11
·3445-3453
·
IF 2.911
Li Xia,Dong Hao,Wang Bo,Lv Jun,Xu Guangqing,Wang Dongmei,Wu Yucheng
Firstly, h-CdS/c-CdS homojunction was prepared by solvothermal method with controlling the Cd-to-S molar ratio. Then, the MoS 2 /h-CdS/c-CdS nanocomposites were constructed by ultrasonic method with different MoS 2 amount. The experimental results showed that when the molar ratio of Cd and S was 1:1 and the amount of MoS 2 was 1.5 wt%, the MoS 2 /h-CdS/c-CdS nanocomposites exhibited excellent photocatalytic performance for hydrogen evolution under visible light. The total amount of hydrogen evolution was 3753.12 µmol for 5 h, and its average hydrogen evolution rate was 40.79 mmol h −1 g −1 with an apparent quantum efficiency of 38.16% irradiated at 420 nm, which was about 7.3 times when compared with the h-CdS/c-CdS homojunction (Cd:S = 1:8). The enhanced photocatalytic performance of MoS 2 /h-CdS/c-CdS could be attributed to the improved specific surface area and formation of well bonded interface structure, which not only enhanced the response to visible light but also decreased the recombination rates of photogenerated charge carriers. Graphical Abstract
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CELLULOSE
·
2016
·Vol. 23
·期 1
·811-821
·
IF 3.195
Zhou Xingman,Lin Xinxing,White Kevin L.,Lin Shan,Wu Hui,Cao Shilin,Huang Liulian,Chen Lihui
Acetylated cellulose powders with varying degree of substitution (DS) were prepared by reacting cellulose with acetic anhydride. The effect of DS on the hydrophobic properties of acetylated cellulose was examined based on contact angle and mechanical stability measurements. The surface energy of the acetylated cellulose decreases with increasing DS, and for DS of 0.39, the acetylated cellulose was able to encapsulate a water droplet to form a liquid marble. The corresponding cellulose acetate powder-over-water spreading coefficient was ca. 8.9. Increasing DS also improved the mechanical stability of the liquid marble. This study opens important perspectives for the precise control of DS of cellulose acetate for various practical applications in membranes, filters, scaffolds, and textiles.
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Scientific Reports
·
2019
·Vol. 9
·期 1
·1-11
·
IF 4.011
Wang Linjuan,Zan Ling
Compositing nanoparticles photo-catalyst with enormous surface areas metal–organic framework (MOF) will greatly improve photocatalytic performances. Herein, WO 3 nanoparticles are partly embedded into pores of MIL-101 or only supported on the outside of representative MIL-101, which were defined as embedded structure WO 3 @MIL-101@WO 3 and coating structure WO 3 &MIL-101 respectively. Different pH, concentration and loading percentage were researched. XRD, TEM and BET were carried to analyze the composites. Compared with the pristine WO 3 , all WO 3 loaded MOF nanocomposites exhibited remarkable enhancing for the efficiency of photocatalytic degradation methylene blue under visible light. Their activity of the same loading percentage WO 3 in embedded structure and coating structure have increased for 9 and 3 times respectively compared with pure WO 3 . The WO 3 @MIL-101@WO 3 has 3 times higher efficiency than WO 3 &MIL-101, because the shorter electron-transport distance can make a contribution to electron–hole separation. The further mechanism involved has been investigated by radical quantify experiment, XPS and photoluminescence spectroscopy.
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POLYMER BULLETIN
·
2019
·Vol. 77
·期 8
·4401-4416
·
IF 1.858
Zhao Junchai,Li Shichao,Zhao Yujing,Peng Zheng
In this work, composite hydrogels composed of sodium alginate (SA) and two crystal structures of cellulose nanocrystals (CNCs) I and II were prepared, respectively. Impacts of CNC polymorphs and initial state of the hydrogels on the swelling kinetics were analyzed on the basis of power law and Schott’s second-order kinetic equation. It was found that the swelling ratio of SA/1 CNC II was the largest, and it showed the non-Fickian diffusion behavior, while SA and SA/1 CNC I exhibited the Fickian diffusion behavior. And the swelling ratio of soaked hydrogels was great larger than that of the rinsed ones, but the swelling mechanism of the two situations was almost the same, that is, the Fickian diffusion behavior. In addition, drug release tests were performed in deionized water using chloramphenicol as a model drug. The results indicated that for the soaked hydrogels, the drug loading was high, while the release rate was slow. The reason for the higher loading but slower release rate was also discussed based on the morphology of hydrogels. On the other hand, the addition of CNC II into SA brought the high drug loading and slow release rate. It resulted from the strong hydrophilicity of CNC II and the strong interaction between drug and SA/CNC II hydrogels. This work could give a new promise for tuning the swelling and drug release behavior of hydrogels by varying the initial state of hydrogels or the crystal form of CNCs.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 16
·12320-12325
·
IF 2.019
Li Gang
Bi 2 WO 6 nanofibers were synthesized by an electrospinning process. The phase, microstructure and photocatalytic performance of the obtained Bi 2 WO 6 photocatalysts were investigated. The XRD patterns and FTIR spectrum suggest that Bi 2 WO 6 nanofibers have the orthorhombic phase. The SEM and TEM images show that Bi 2 WO 6 nanofibers have a rough surface and a large number of hollow caves. The Bi 2 WO 6 hierarchical nanofibers show a high decomposition efficiency of MO under light irradiation. The higher photocatalytic activity of Bi 2 WO 6 nanofibers results from the large specific surface area. The large specific surface area provides more surface active sits and makes an easier charge carrier transport.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 5
·1-8
·
IF 5.479
Tan Xiaofeng,Zhang Lianhua,Tang Qiaorong,Zheng Gengxiu,Li He
A nanozyme-linked immunosorbent assay is described for cardiac troponin I which is a biomarker for myocardial infarction. The method is based on the use of Pd-Ir nanocubes with excellent peroxidase-like activity. The nanocubes catalyze the oxidization of nonfluorescent o-phenylenediamine (OPD) by H 2 O 2 to form a yellow fluorescent product (oxOPD) with excitation/emission maxima at 400/570 nm. Carbon dots are added as a reference fluorophore. Under the same excitation wavelength, they display blue fluorescence (450 nm). The ELISA uses the Pd-Ir nanocubes as a label for the secondary antibody and OPD as substrate. The ratio of fluorescence intensities at 570 and 450 nm increases in the 1 pg·mL −1 to 1 ng·mL −1 cardiac troponin I concentration range, and the detection limit is 0.31 pg·mL −1 . The method was applied to analyze spiked serum samples, and the results compared well with those obtained by a commercial chemiluminescence assay.
Schematic presentation of the ratiometric fluorescence immunoassay for cardiac troponin-I. Pd-Ir nanocubes were employed to fabricate nanozyme-based signal labels for its excellent peroxidase-mimicking activity.
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MICROCHIMICA ACTA
·
2018
·Vol. 186
·期 1
·1-9
·
IF 5.705
Huang Yanli,Tan Yi,Feng Chuanqi,Wang Shiquan,Wu Huimin,Zhang Guangxue
The preparation of 3 kinds of carbonaceous nanocomposites by hydrothermal treatment and subsequent calcination described. The first comprises a nanomaterial of type CuO/g-C 3 N 4 , with g-C 3 N 4 in mass fractions of 2, 5 and 7 wt%, respectively. The second comprises CuO/porous carbon (5 wt%), and the third comprises CuO/carbon spheres (5 wt%). All of them were employed to modify a glassy carbon electrode (GCE) to obtain electrochemical sensors for glucose and dopamine. The GCE modified with CuO/g-C 3 N 4 (5 wt%) displays the highest electrocatalytic activity towards glucose and dopamine. Figures of merit for sensing glucose (in 0.1 M NaOH solution) include a wide linear range (0.5 μM to 8.5 mM), a detection limit of 0.150 μM, and a sensitivity of 0.274 μA·μM −1 ·cm −2 (at a working potential of 0.60 V vs. Ag/AgCl). The respective data for dopamine (in pH 7.0 solution) are linear ranges from 0.2-16.0 μM and 16.0-78.7 μM, a lower detection limit of 60 nM, and an electrochemical sensitivity of 0.834 and 0.331 μA·μM −1 ·cm −2 (at a working potential of 0.22 V vs. Ag/AgCl). The good performance of the modified GCE is attributed to the synergetic interactions between CuO and the appropriate fraction of g-C 3 N 4 , and the improvement of conductivity.
Schematic presentation of a electrochemical sensor based on CuO/g-C 3 N 4 for the determination of glucose and dopamine.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 9
·8902-8913
·
IF 2.914
Sun Chen,Chen Tong,Huang Qunxing,Wang Jun,Lu Shengyong,Yan Jianhua
Novel KMnO 4 -treated magnetic biochar (FMBC) was successfully synthesized by addition of Fe(NO 3 ) 3 during carbonization and KMnO 4 treatment following for Pb(II) and Cd(II) adsorption. SEM-EDS, XPS, and ICP-AES were used to evaluate the FMBC and magnetic biochar (FBC) on surface morphology, surface chemistry characteristics, surface functional groups, and Pb(II) and Cd(II) adsorption behavior. Results showed that the Langmuir maximum adsorption quantity of FMBC reached 148 mg/g for Pb(II) and 79 mg/g for Cd(II), nearly 7 times of that of FBC. The enhancement of FMBC for heavy metal adsorption was due to the successful load of manganese oxides and the increased oxygen functional groups consistent with XPS and FTIR results. The adsorption capacities of FMBC were maintained over 95% when the pH value was higher than 2.5 and 3.5 for Pb(II) and Cd(II), respectively. The adsorption performances of both heavy metals by FMBC were hardly influenced by ionic strength and humid acid. The adsorption capacities of FMBC could maintain over 50% and 87% after four cycles for Pb(II) and Cd(II), respectively. The saturation magnetization of FMBC was about 11.5 emu/g, which did not change after adsorption. This work proposed a new method to fabricate a magnetic biochar with high adsorption capacities of heavy metals Pb(II) and Cd(II).
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