JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 11
·8216-8225
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IF 3.442
Xu Wen,Cao Bo,Lin Hechun,Cheng Wenjuan,Luo Chunhua,Peng Hui,Duan Chungang
The catalytic activities of three topotactic phase strontium cobaltites (SCO, hexagonal, orthorhombic and tetragonal) for H 2 O 2 decomposition were studied. All they present excellent catalytic activity with good stability at cycled test, and the mesoporous tetragonal SCO exhibits the best activity. Detailed kinetic research indicates the zero-order process of H 2 O 2 decomposition. Increasing the temperature will accelerate the reactions greatly with the controlled temperature in the range of 20–45 °C. The calculated active energy ( E a ) for H-SCO, O-SCO and T-SCO is 93.2, 85.1 and 87.5 (kJ/mol), respectively. The efficient catalytic degradation of Rhodamine B illustrates that SCO is a kind of promising catalysis for the advanced oxidation process.
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MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Hongduo Yao,Xiaoxue Wang,Jianping Gao,Chunjuan Gao,Ruiru Zhao,Xiangang Zhai,Yongli Wu,Chaoyue Hao,Jiangbing Yang,Shunkang Mei,Haixia Qiu
Waste water treatment with adsorbents has become one of the most effective methods. In this work, we have reported the preparation of the flower-like Cu 2 MoS 4 /g-C 3 N 4 composites. The Cu 2 MoS 4 nanosheets were arranged in a flower-like structure by a simple one-step hydrothermal synthesis method and attached to g-C 3 N 4 nanosheets. The as-prepared flower-like Cu 2 MoS 4 /g-C 3 N 4 composites was found to have potential for the adsorption of RhB in aqueous solution. The microstructure of the product was analyzed by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectra, X-ray photoelectron spectroscope (XPS), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET). The effects of the ratio of the composite material, the initial concentration of the dye and the contact time were explored. The Langmuir maximum adsorption capacity of the flower-like Cu 2 MoS 4 /g-C 3 N 4 composites for RhB was reached 420.2 mg/g. Moreover, the adsorption process is consistent with the pseudo second-order kinetic model, the Langmuir isotherms model and the Freundlich isotherms model.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Yaping Wang,Yike Li,Jingli Zhao,Jianshe Wang,Zhongjun Li
Developing high activity and eco-friendly photocatalysts for water splitting is still a challenge in solar energy conversion . In this paper, B doped g-C 3 N 4 quantum dots (BCNQDs) were prepared via a facile molten salt method using melamine and boron oxide as precursors. By introducing BCNQDs onto the surface of g-C 3 N 4 , g-C 3 N 4 /BCNQDs heterojunction was constructed via hydrothermal treatment . The resulting g-C 3 N 4 /BCNQDs heterojunction exhibits enhanced hydrogen evolution performance for water splitting under visible light irradiation . The mechanism underlying the improved photocatalytic activity was explored and discussed based on the formation of heterojunction between g-C 3 N 4 and BCNQDs with well-matched band structure .
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MICROCHEMICAL JOURNAL
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2019
·
IF 3.206
Xiaolan Jiang,Yuncong Yuan,Linbo Chen,Yiming Liu,Mengwei Xiao,Yadong Hu,Ze Chun,Xun Liao
Monoamine oxidase B (MAO-B) was for the first time immobilized on magnetic nanoparticles to be used for screening of MAO-B inhibitors from herbal extracts. The immobilized enzyme was characterized with transmission electronic microscopy , Fourier transform infrared spectroscopy, thermal gravimetric analysis , and vibrating sample magnetometer. The immobilized enzyme retained 95% of the activity, while the thermostability was significantly increased. It was then used as solid phase extraction absorbent to extract MAO-B's ligands from two traditional Chinese medicinal plants, Cortex fraxini and Pericarpium granati . Calceolarioside B and ellagic acid were extracted from C. fraxini and P. granati, respectively, and both of them were found to be inhibitors of MAO-B with IC 50 of 40.95 ± 0.63 and 103.70 ± 2.34 μ M, respectively. This is the first report that calceolarioside B inhibits MAO-B activity. Furthermore, inhibitory mechanisms of both compounds were studied by molecular docking analysis, the results of which demonstrated that the affinity of calceolarioside B with monoamine oxidase B was stronger than that of ellagic acid. The method proposed in this work is highly efficient for screening of MAO-B inhibitors from complex mixtures, showing great potential in discovering anti-Parkinson's disease compounds present in medicinal plants.
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CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Jing Miao,Xi-qin Yang,Zhe Gao,Qian Li,Ting-ting Meng,Jia-ying Wu,Hong Yuan,Fu-qiang Hu
DrzBC and DrzBS (10-23 DNAzyme) could block the expression of HBV e- and s- gene respectively. But the application of 10-23 DNAzyme was limited owing to the lack of appropriate delivery vehicles. Chitosan oligosaccharide-SS-Octadecylamine (CSSO), a redox-responsive nano-sized polymeric carrier, could self-aggregate and bind with DNA by electrostatic interaction at proper mass ratio. Compared with the traditional commercial carrier Lipo2000, CSSO exhibited lower cytotoxicity, efficient cellular uptake by targeting cells, and rapidly DNA released in cytoplasm after escaping from endosomes. Including the same DNA concentration, Lipo2000/(DrzBC or DrzBS) showed maximum inhibitory rate on HBeAg (47.29 ± 1.86%) and HBsAg (33.58 ± 0.72%) secretion after 48 h incubation, and then both decreased. In contrast, HBeAg secretion inhibition by CSSO/DrzBC and HBsAg secretion inhibition by CSSO/DrzBS were up to 73.86 ± 1.77% and 67.80 ± 2.51% at 48 h, and further increased to 83.83 ± 2.34% and 76.79 ± 2.18% at 72 h, respectively. CSSO is a promising redox-responsive polymeric carrier for efficient anti-Hepatitis B Virus gene therapy.
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IONICS
·
2019
·Vol. 25
·期 9
·4351-4360
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IF 2.289
Yu Zhongliang,Zhang Jiahe,Xing Chunxian,Hu Lei,Wang Lili,Ding Ming,Zhang Haitao
Boron-nitrogen co-doped graphene nanoarchitectures were synthesized by annealing a freeze-dried precursor containing exfoliated graphene oxide (GO) nanosheets, ammonium borate, and polyvinyl alcohol (PVA). The microstructures and composition of nanocomposites were optimized and characterized systemically. Effects of a doping element on the electrochemical performances and interface compatibility were evaluated. The restacking of exfoliated graphene nanosheets was hindered effectively by the ultra-fine carbon clusters formed via the thermal decomposition of PVA. Such a three-dimensional structure favors the fast mobility of electrolyte ions. In addition, the co-doping of N and B elements not only increases interface compatibility between ionic liquid electrolyte and graphene but also supplies extra pseudocapacitance. Benefiting from the integrated merits, the optimized nanocomposites could deliver a specific capacitance of 35.4 F g −1 at 1 A g −1 and present a maximum energy density of 78.7 Wh kg −1 with a power density of 2043 W kg −1 . Due to the formation of more decoupled ions in ionic liquid electrolyte at elevated temperature, the symmetric supercapacitors based on the as-formed nanocomposite exhibit a maximum energy density of 134.6 Wh kg −1 at 60 °C.
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JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
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2019
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IF 4.178
Qin Sun,Wanchun Yang,Yihan Liu,Yufeng Li,Mingyu Li
Soda lime tempered glass was successfully joined by a Bi-B-Zn lead-free low-melting glass with a composition of 35Bi 2 O 3 -50H 3 BO 3 -15ZnO (mol%). The Bi-B-Zn glass exhibited a glass transition temperature (T g ), softening point (T d ) and crystallization temperature (T c ) of 346 ℃, 364 ℃and 448 ℃ respectively. The wettability of the glass on tempered glass substrate was investigated, and a contact angle of less than 13.94° was obtained when the temperature was raised to above 470 ℃ in open atmosphere. The microstructural evolution, interfacial bonding mechanism and mechanical properties of the joint at different joining temperatures were investigated. The diffusion bonding between Bi-B-Zn glass solder and tempered glass was achieved. The crystals of Bi 4 B 2 O 9 were detected in the joint when the joining temperature was higher than 450 ℃. The shear strength and Vickers hardness of the joint reached 35.14 ± 1.89 MPa and 191.55 ± 13.93 MPa, respectively. The effects of the fractions and size of Bi 4 B 2 O 9 on the shear strength were evaluated, and the fracture mechanism at the interface was also clarified.
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Frontiers in Immunology
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2019
·
IF 4.716
Wu Liting,Kong Linghe,Yang Yanjian,Bian Xia,Wu Siwei,Li Bingxi,Yin Xiaoxue,Mu Liangliang,Li Jun,Ye Jianmin
Teleost B cells have phagocytic activities for ingesting particulate antigens, such as bacteria, in addition to the functional secretion of immunoglobulins (Igs). In the present study, the phagocytic activities of IgM+ B cells under various differentiational conditions residing in peripheral blood leukocytes were investigated in a teleost fish Nile tilapia (Oreochromis niloticus). The IgM+ B cells were recognized as IgMlo or IgMhi subsets based on their membrane IgM (mIgM) levels. The mIgM, secreted IgM (sIgM), major histocompatibility complex class II and reactive oxygen species were detected. Expressions of transcription factors (Pax5 and Blimp-1) and B cell signaling molecules (CD79a, CD79b, BLNK, and LYN) suggested that IgMlo B cells were resembling as plasma-like cells and IgMhi resembling as naïve/mature B cells, respectively. Analysis of phagocytic activities demonstrated that both IgMlo and IgMhi B cells have a similar phagocytic ability (phagocytosis percentage); however, the phagocytic capacity [phagocytic index and the mean fluorescence intensity (MFI)] of IgMhi B cells was significantly higher than that of IgMlo B cells. Taken together, the results indicated that B cell differentiation may cause the decrease of phagocytic capacity but not phagocytic ability of phagocytic IgM+ B cells in teleost. The finding may provide an evolutionary evidence for understanding the greater specialization of the B cell in more sophisticated adaptive humoral immunity, by decreasing phagocytic activity in order to contribute its function more specifically into antibody-secreting.
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JOURNAL OF HAZARDOUS MATERIALS
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2018
·
IF 6.434
Lili Jiang,Ying Zhang,Minghua Zhou,Liang Liang,Kerui Li
In this study, porous carbon aerogel (CA) was synthesized with D-glucose, ammonium persulfate and aniline by a hydrothermal carbonization method. It was reported for the first time as an excellent catalyst for activating persulfate (PS) to degrade rhodamine B (RhB). The morphology of CA was characterized, exhibiting microporous and mesoporous structures. The solution pH of 3, 5, 7 and 9 showed slight impact on the degradation of RhB; however, when the pH increased to 11, the removal of RhB decreased. The PS concentration and CA dosage played a key role in the RhB degradation, and the activation energy was calculated to be 22.11 kJ/mol. Electron paramagnetic resonance (EPR) spectra suggested that neither sulfate radical (SO4 − ) nor hydroxyl radical ( OH) was generated from the PS activation. The radical quenching experiments also confirmed that CA activated PS in a non-radical pathway. It was indicated that PS bonded with C C in the sp 2 hybridized system could directly degrade RhB. The defective edges at the boundary of CA also facilitated the RhB removal. This work presented a green material with both excellent catalytic performance and high regeneration possibility in the heterogeneous metal-free PS activation, providing a new strategy in water treatment.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 42
·20760-20768
·
IF 9.931
Xiaoqin Sun,Fangfang Wu,Gang Liu,Xiaoxiang Xu
The perovskite oxynitride SrTaO2N is a promising compound for solar energy conversion because it has strong visible light absorption at wavelengths as long as 650 nm. However, its photocatalytic activity is generally very poor, primarily because of the high defect concentration induced during its synthetic procedures as well as photocatalytic self-decomposition events. In this work, we introduce Sr into the B site of SrTaO2N to form a complex perovskite oxynitride, Sr3(Sr1/3Ta2/3)3O9−xNy (i.e. Sr4Ta2O9−xNy). The new compound has a much lower defect concentration compared to SrTaO2N and much higher stability against photocatalytic self-decomposition. More importantly, Sr4Ta2O9−xNy demonstrates significantly improved photocatalytic activity for water oxidation and reduction reactions under visible light irradiation (λ ≥ 400 nm) than SrTaO2N, approaching an apparent quantum efficiency as high as 3.4% at 420 ± 20 nm.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Peng Shi,Xingkang Hu,Yiting Wang,Ming Duan,Shenwen Fang,Wenjuan Chen
A polyether sulfone (PES) microfiltration membrane was decorated by the deposition of mixture of polyethylene glycol (PEG) and tannic acid (TA). It was used as an adsorbent for the removal of Rhodamine B (RhB) from water and had a high removal ratio (>98.9%) at high flux up to 4777 L/(m 2 ⋅h) in dynamic test. The mixture of PEG and TA formed a stable suspension but it transformed to a viscous mixture during permeating the narrow channel of membrane, which resulted in high dispersion of the TA within the membrane and good dye adsorption. The turbulence and high driving force in the dynamic test ensured good contact of dye and the adsorbent, which led to good dye removal, while in stationary adsorption test it had only moderate dye adsorption. Molecular dynamics study revealed the molecular weight of PEG had an effect on the aggregation morphology of PEG and TA, as well as the exposure of TA on the surface, leading to different removal performance. Our study provided a simple and quick method to prepare adsorbent for the fast removal of dye from water.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2019
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IF 3.973
Guanghui Hou,Junmin Qian,Weijun Xu,Tiantian Sun,Jinlei Wang,Yaping Wang,Aili Suo
The combination of chemotherapy and photothermal therapy is acknowledged as one of the most promising approaches in cancer treatment. Targeted delivery and controlled drug release are two important factors for combined chemo-photothermal therapy. In this study, a multifunctional nanoplatform based on gold nanorod (GNR) decorated with folate-conjugated poly(ethylene glycol)- b -poly(L-γ-glutamylhydrazine) (FEGGH) containing disulfide linker and dihydroxyphenyl groups was developed for targeted combined chemo-photothermal therapy of breast cancer. FEGGH was synthesized by ring-opening polymerization of γ-benzyl- l -glutamate -N- carboxyanhydride using folate/cystamine-heterobifunctionalized poly(ethylene glycol) as an initiator, following by hydrazinolysis and carbodiimide reactions. FEGGH was decorated onto GNR through Au-catechol bonds. Chemotherapeutic drug doxorubicin (DOX) was loaded onto the nanoplatform through pH-sensitive hydrazone linkage, obtaining final product FEGGH DOX -GNR. The DOX-loaded nanoplatform displayed excellent photostability and reduction/pH dual-responsive drug release behavior. Cytological studies demonstrated the effective internalization of FEGGH DOX -GNR into MCF-7 cells via folate-mediated endocytosis and additive therapeutic effect of combined photothermal-chemotherapy. These results indicate that our nanoplatform may be a promising strategy for targeted combined chemo-photothermal therapy of breast cancer.
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