APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Liping Zhang,Guohong Wang,Zhenzhong Xiong,Hua Tang,Chuanjia Jiang
A combined hydrothermal-calcination approach is developed to synthesize hierarchical β -Bi 2 O 3 /g-C 3 N 4 direct Z-scheme photocatalyst with enhanced visible light photoactivity for Rhodamine B (RhB) degradation. First, Bi 2 O 2 CO 3 microflowers were hydrothermally prepared using Bi(NO 3 ) 3 ·5H 2 O as feedstocks, and then a series of β -Bi 2 O 3 /g-C 3 N 4 direct Z-scheme photocatalysts were synthesized via a facile calcination method using Bi 2 O 2 CO 3 and g-C 3 N 4 as precursors. The samples were systematically characterized by various characterization technologies including X-ray diffraction, scanning and transmission electron microscopes, Fourier transform infrared spectroscopy and N 2 absorption-desorption equipment. It was found that the g-C 3 N 4 content in the precursors played a key role in affecting the photocatalytic activity of the final products. The β -Bi 2 O 3 /g-C 3 N 4 heterojunction exhibited higher photocatalytic activity than single active components ( β -Bi 2 O 3 and g-C 3 N 4 ), indicating the presence of a synergistic effect between two active components in β -Bi 2 O 3 /g-C 3 N 4 heterojunction. Among all as-prepared catalysts, the 70 wt.% g-C 3 N 4 /Bi 2 O 2 CO 3 exhibits the highest activity for RhB degradation, and the apparent reaction rate constant k (42.2 × 10 −3 min −1 ) is 3.1 and 1.7 times as high as that of pure β -Bi 2 O 3 (13.5 × 10 −3 min −1 ) and g-C 3 N 4 (25.2 × 10 −3 min −1 ), respectively. The enhanced photocatalytic performance of β -Bi 2 O 3 /g-C 3 N 4 heterostructure photocatalysts is mainly due to the high surface area, closely contacted interfaces between the β -Bi 2 O 3 and g-C 3 N 4 component, and the formation of direct Z-scheme structure in the β -Bi 2 O 3 /g-C 3 N 4 composites.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2019
·Vol. 95
·期 3
·862-874
·
IF 2.659
Fei Rao,Gangqiang Zhu,Miaomiao Wang,Siyaka Mj Zubairu,Jianhong Peng,Jianzhi Gao,Mirabbos Hojamberdiev
BACKGROUND Photocatalysis is one of the effective ways to solve the problem of water and gas pollution. An excellent photocatalyst should have the following advantages: efficient photocatalytic activity for gas and water pollutants, recyclable and stable characteristics, non-toxic and low-cost. Constructing heterojunctions and introducing oxygen vacancies (OVs) are two effective measures to achieve these targets. RESULTS It is found that the 1.0% Pd/PdO/β-Bi 2 O 3 exhibits the best photocatalytic activity with an efficiency of 97.4% for Bisphenol A (BPA) degradation and 47.6% for nitric oxide (NO) removal within 30 min. The 1.0% Pd/PdO/β-Bi 2 O 3 composite shows 23.3% efficiency in the photodegradation of BPA under 595 nm monochromatic light irradiation, while β-Bi 2 O 3 tends to be invalid. Moreover, the OVs promote the removal of NO without irradiation. CONCLUSION In this work, a novel ternary Pd/PdO/β-Bi 2 O 3 material as high-performance photocatalyst for the BPA degradation and NO removal was synthesized. The presence of OVs promotes the activation of the oxygen molecule, thereby facilitating the photocatalytic process. The p - n junction of PdO/β-Bi 2 O 3 and the Schottky barrier of Pd/β-Bi 2 O 3 significantly limit the recombination of photoinduced electron–hole pairs in the composite. Furthermore, an artifact in the electron spin resonance (ESR) spectrum obtained by spin trapping with 5,5-dimethyl-1-pyrroline N -oxide (DMPO) as adducts confirms that both hydroxyl radical (•OH) and superoxide radical (•O 2 − ) species are involved in the photocatalytic process. The present work offers a new perspective for developing the composite photocatalysts with high efficiency through loading of metal nanoparticles and creating an heterojunction. © 2019 Society of Chemical Industry
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 11
·15046-15058
·
IF 2.478
Zhong Yue,Chen Zhou,Chen Gui,Luo Yang,Zhang Lizhong,Hua Bin,Li Jianhui,Sun Yifei
The development of an efficient synthesis process for carbon-based supercapacitor electrodes is highly appreciated for its practical application. In this work, using β-cyclodextrin (O and C sources), melamine (C and N sources) and zinc chloride (active agent) as affordable precursors, we proposed a cost-efficient route integrating one-pot hydrothermal treatment and in situ carbonization/activation to obtain a N/O co-doped hierarchically porous carbon sheets and employ them as a potential electrode for supercapacitor. The β-cyclodextrin with abundant hydrophobic cavity assists the formation of porous architecture with a large specific surface area (SSA) of 1427 m 2 g −1 . The materials are systematically characterized using various technologies including SEM, XRD, Raman, TEM and XPS measurements. Further, the supercapacitor performances are analyzed using cyclic voltammetry at different scan rates, ac impedance and galvanostatic charge/discharge measurement. A specific capacitance of 240 F g −1 (at 0.5 A g −1 ) and 120 F g −1 (at 0.3 A g −1 ) could be obtained in three-electrode system and symmetric two-electrode full device measurements, respectively. This work points out a new avenue for the fabrication of carbon-based high-performance supercapacitors.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 40
·期 18
·3718-3724
·
IF 2.557
Xu Ling,Li Zou,Zilin Chen
A polymeric column that contains multiwalled carbon nanotubes-β-cyclodextrin composite was developed. The composite was wrapped into the poly(butyl methacrylate-ethylene dimethacrylate) monolith column (0.76 mm id and 10 cm in length). The column was then applied for the online solid-phase microextraction of psoralen and isopsoralen from Fructus Psoraleae. Following microextraction, the coumarins were quantified by high-performance liquid chromatography with C 18 separation column and UV detection. The effects of sample flow rate, sample volume, and pH value were optimized. The method showed low limits of detection (20 pg/mL, S/N = 3) for both psoralen and isopsoralen. Finally the method was successfully applied to the determination of psoralen and isopsoralen in spiked herb extracts and rat plasma where it gave recoveries that ranged between 93.2 and 102.1%. The empty hydrophobic cavities of β-cyclodextrin and the hydrophobicity of multiwalled carbon nanotubes provided specific extraction capability for psoralen and isopsoralen.
研究领域:
分析化学
·
药理学
✓ 已验证
DOI
高影响因子
Frontiers in Pharmacology
·
2025
·
IF 4.8
Qian Feng,Cai-Zhi Li,Yi-Hua Zou,Xue-Yu Wang,Xia Yang,Rong Zhang*,Zhong-Qiu Liu*,Rong-Rong Zhang
Introduction: Brain metastasis (BM) is the most common and serious complication of breast cancer (BC). There is significant interest in investigating the crosstalk between BC cells and immune cells. β-elemene is the main pharmacodynamic component of Curcumae Rhizoma, a traditional Chinese medicine that is commonly used for the clinical treatment and prevention of various tumors. However, the specific underlying mechanism of β-elemene in BC-BM is still unclear.Methods: An intracardiac (ICT) injection model was used to establish specific BC-BM cells, then an intracarotid (ICD) injection model was used to verify the inhibitory effect of β-elemene in BC-BM. Tumor-cell-conditioned media, a primary microglia co-culture model, and an in vitro recruitment experiment were used to explore crosstalk between BC cells and immune cells. TMT-based quantitative proteomic, ELISA, IF, and other molecular biotechnologies were used to investigate the mechanisms.Results: The BC-BM cells established in our study not only increased BM rates but also exhibit mesenchymal phenotype and activated the JAK–STAT signaling pathway. Microglia, particularly M2 microglia, were enriched in BM lesions and secreted high levels of both IL6 and CCL2. Hypersecretory IL6 reversed the MET process of BC cells by regulating the JAK2/STAT3 signaling pathway to promote colonization in the brain. Increased levels of CCL2 significantly recruited monocytic myeloid-derived suppressor cells (M-MDSCs) to induce an immunosuppressive brain microenvironment. β-elemene could significantly inhibit BC-BM in mice by regulating the IL6/STAT3 signaling pathway and suppressing the M-MDSC recruitment.Conclusion: Our work first demonstrated that β-elemene regulated the IL6/STAT3 axis and M-MDSC recruitment to reconstruct immunosuppressive brain microenvironment to suppress BC-BM.
研究领域:
肿瘤学
·
免疫学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THIN SOLID FILMS
·
2018
·
IF 1.939
Tingting Men,Xin Liu,Baohua Jiang,Xifa Long,Haiyan Guo
Piezopolymer poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE) films doped with BaTiO 3 (BT) and polydopamine coated BT (BT-Pdop) nanoparticles were prepared by spin-coating method. Polydopamine modifies the interfaces of inorganic BT nanoparticles and PVDF-TrFE matrix with its polar hydroxyl groups, enhancing the piezoelectric β -phase. BT-Pdop nanoparticles were obtained in pH 8.5 buffer solution . For ferroelectric PVDF-TrFE, the favorable piezoelectric property comes from its ferroelectricity . Therefore, we studied the ferroelectric property of the nanocomposite films . The nanocomposite thin films possess better ferroelectric property than the pure PVDF-TrFE thin films , as demonstrated by the ferroelectric hysteresis curves. The remanent polarizations are 13.59 and 13.94 μC/cm 2 after the doping of 1.0 wt% BT and 1.0 wt% BT-Pdop, respectively, which are about twice that of neat PVDF-TrFE. The piezoelectric β -ferroelectric phase increases with doping, according to X-Ray Diffraction analysis. In addition, the images of polarized optical microscopy and atomic force microscopy also reveal significant enhancement in crystallinity . The neat PVDF-TrFE is a semicrystalline polymer and the size of crystalline spherulites increases with the addition of BT and BT-Pdop nanoparticles. However, even the crystallinity of PVDF-TrFE considerably improved with polydopamine interfacial modification of BT, the increase of remanent polarization due to Pdop is only marginal. We infer that there are other defects at interfaces of BT-Pdop doped PVDF-TrFE nanocomposites which counteract the beneficial effect of the polar OH of polydopamine. Considerable enhancement on ferroelectric property of BT-Pdop doped PVDF-TrFE nanocomposites is expected after these issues are addressed.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Hao Tang,Hua Zhou,Xianhua Cheng
The green and red upconversion (UC) emissions of 35 mol% Ca 2+ doped β-NaYF 4 :Yb 3+ /Er 3+ microcrystals were improved to 102.8 and 43.1 times higher than those of Ca 2+ -free counterparts. X-ray powder diffraction spectra, scanning electron microscopy, Fourier transform infrared spectroscopy , upconversion luminescence (UCL) spectroscopy and Judd-Ofelt analysis were performed to investigate the mechanism of UCL intensity enhancement caused by Ca 2+ doping. The hexagonal-to-cubic phase transition was observed when Ca 2+ doping concentration exceeded 35 mol%. The incorporation of Ca 2+ into hexagonal microcrystals lattice induced unit cell volume enhancement and microcrystals surface to volume ratio variation, which affected the UCL intensity by hindering the non-radiative energy loss process via Yb 3+ /Er 3+ ions and changing the amount of surface quenchers adsorbed on the microcrystals surface. The hypersensitive transition related local crystal field asymmetry around Er 3+ in the grown hexagonal microcrystals was also investigated by Judd-Ofelt analysis but unexpectedly found to be the less dominant factor for the UCL intensity variation. This study helps to realize the mechanism of impurity ion doping resulted UCL intensity enhancement, which is instructive for high-performance UC microcrystals synthesis.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Theranostics
·
2019
·
IF 8.063
Xu-Qi Kang,Gao-Feng Shu,Sai-Ping Jiang,Xiao-Lin Xu,Jing Qi,Fei-Yang Jin,Di Liu,Yong-Hong Xiao,Xiao-Yang Lu,Yong-Zhong Du
The prevalence of antibiotic resistance and lack of alternative drugs have posed an increasing threat to public health. Here, we prepared β-Ga 2 O 3 :Cr 3+ nanoparticles modified with ICAM1-antibody-conjugated TPGS (I-TPGS/Ga 2 O 3 ) as a novel antibiotic carrier for the treatment of drug-resistant infections. Methods : I-TPGS/Ga 2 O 3 were firstly characterized by measuring particle size, morphology, crystal structure, drug loading capacity, and in vitro drug release behaviors. The in vitro antibacterial activities of I-TPGS/Ga 2 O 3 /TIG were evaluated using standard and drug-resistant bacteria. The internalization of I-TPGS/Ga 2 O 3 was observed by fluorescence confocal imaging, and the expression levels of the efflux pump genes of TRKP were analyzed by real-time RT-PCR. In vitro cellular uptake and in vivo biodistribution study were performed to investigate the targeting specificity of I-TPGS/Ga 2 O 3 using HUEVC and acute pneumonia mice, respectively. The in vivo anti-infective efficacy and biosafety of I-TPGS/Ga 2 O 3 /TIG were finally evaluated using acute pneumonia mice. Results : It was found that TPGS could down-regulate the over-expression of the efflux pump genes, thus decreasing the efflux pump activity of bacteria. I-TPGS/Ga 2 O 3 with small particle size and uniform distribution facilitated their internalization in bacteria, and the TPGS modification resulted in a significant reduction in the efflux of loaded antibiotics. These properties rendered the encapsulated tigecycline to exert a stronger antibacterial activity both in vitro and in vivo . Additionally, targeted delivery of I-TPGS/Ga 2 O 3 mediated by ICAM1 antibodies contributed to a safe and effective therapy. Conclusion : It is of great value to apply I-TPGS/Ga 2 O 3 as a novel and effective antibiotic delivery system for the treatment of drug-resistant infections.
研究领域:
药学
·
生物医学工程
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Junxin Zhao,Maomao Ma,Xianghui Yan,Dongman Wan,Zheling Zeng,Ping Yu,Deming Gong
The lipase from Bacillus licheniformis NCU CS-5 was immobilized onto β -cyclodextrin (CD) grafted and aminopropyl-functionalized chitosan-coated Fe 3 O 4 magnetic nanocomposites (Fe 3 O 4 -CTS-APTES-GA- β -CD). Fourier transform infrared spectroscopy, thermogravimetry analysis, X-ray diffraction, scanning electron microscopy and transmission electron microscopy showed that not only the functionalized magnetic nanoparticles were synthesized but also the immobilized lipase was successfully produced. The immobilized lipase exhibited higher optimal pH value (10.5) and temperature (60℃) than the free lipase. The pH and thermal stabilities of the immobilized lipase were improved significantly compared to the free lipase. The immobilized lipase remained more than 80% of the relative activity at temperature of 60 ℃ and pH 12.0. The immobilized lipase also remained over 80% of its relative activity after 28 days of storage and 15 cycles of application. The application of the immobilized lipase in esterification of isoamyl acetate and pentyl valerate showed that maximum esterification efficiency was achieved in n -hexane having 68.0% and 89.2% respectively. Therefore, these results indicated that the Fe 3 O 4 -CTS-APTES-GA- β -CD nanoparticles are novel carriers for immobilizing enzyme, and the immobilized lipase can be used as an innovative green approach to the synthesis of fruity flavor esters in food industry.
研究领域:
生物化学
·
食品科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 12
·123504
·
IF 4.316
Yuan Du,Liu Hao,Wang Zixuan,Wang Xi,Miao Guirong,Wu Xu
β-PbO2 is an important high oxygen overpotential anode coating material. Further study on nanoscale β-PbO2 with higher performance and lower cost is a critical issue in order to develop the electrochemical ozone generator. Herein, an improved β-PbO2 nanoparticles synthesizing strategy based on the traditional Pb(OAc)4 hydrolysis method is proposed in this work, which is more scalable for industrial-scale production compared with existed nano β-PbO2 synthesizing methods. The possible mechanism of synthesizing β-PbO2 nanoparticles via Pb(OAc)4 hydrolysis was discussed for the first time. Based on the proposed mechanism, the size and morphology of the β-PbO2 nanoparticles were effectively controlled, and alternative raw material that can significantly reduce costs was developed. SEM, TEM, XRD, and XPS results indicate that pure phase β-PbO2 nanoparticles range from 10–30 nm were obtained. In addition, the use of alternative raw materials reduces the cost by 90%–95% compared to the traditional Pb(OAc)4 hydrolysis method. The β-PbO2 nanoparticles showed good ozone generation performances. The energy consumption per unit ozone of the β-PbO2 nanoparticles is reduced by 51.9% at the optimized operation condition than the reference PbO2 particles used for comparison.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL LUBRICATION AND TRIBOLOGY
·
2025
·
IF 1.8
Hui Zhao,Huilin Fang,Yuefeng Ma,Zhipeng Li,Tianhui Ren
Purpose This study aims to extend the service life and applicability under ultraviolet (UV) irradiation conditions, the authors reveal the strong UV resistance of dibenzoylmethane molybdenum (MDBM) in aluminum-based greases by analyzing the effect of UV radiation on the rheological properties, antioxidant properties and UV absorption. Meanwhile, the authors evaluate the tribological properties of MDBM under different sliding modes and applied loads in aluminum-based greases. Design/methodology/approach In this work, the authors designed and synthesized an S- and P-free MDBM through a simple one-pot method and examined the tribological and UV-resistant performance of MDBM within aluminum complex grease. Findings The results show that MDBM has good friction-reducing and anti-wear properties, which is attributed to the adsorption of the MDBM itself and the generation of minor amount of MoO 3 on the worn surface at a maximum Hertzian contact pressure of 0.6 Gpa. The authors also reveal the strong UV resistance of MDBM in aluminum-based greases by analyzing the effect of UV radiation on the rheological properties, antioxidant properties and UV absorption, which is mainly attributed to self-keto-enol isomer interconversion from the special structure of β-diketone. Originality/value The work demonstrates a feasible way to develop novel multifunctional UV resistance organic molybdenum lubricating materials. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-02-2025-0048/
研究领域:
材料科学
·
摩擦学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2012
·
IF 3.794
Meiling Liu,Jianhui Deng,Cailang Lai,Qiong Chen,Qiangqing Zhao,Youyu Zhang,Haitao Li,Shouzhuo Yao
Four new conjugated oligo-phenylene-ethynylenes derivatives, N -methyl-4-(4-acetylthiophenylethynyl)-1,8-naphthalimide ( 1 ), thioacetic acid S -[4-(4-aminophenyl-ethynyl)phenyl]ester ( 2 ), 4-methylthiophenylethynylbenzenamine ( 3 ), N -methyl-4-(4-methyl-thiopheny l -ethynyl)-1,8-naphthalimide ( 4 ), were synthesized by Sonogashira and Eglinton cross-coupling reactions. The structures of the four compounds were confirmed by 1 HNMR, 13 CNMR, MS and IR and their spectral characteristics were studied by ultraviolet and visible (UV) spectroscopy as well as fluorescence spectroscopy in different medium. It was found that the fluorescence properties of compounds 2 and 3 were notably improved in aqueous solutions in the presence of β -cyclodextrin ( β -CD). Spectral analysis supported the suppositions that the fluorescence intensity enhancement was due to the formation of inclusion complex with β -CD. The supramolecular interaction was investigated in detail and the reaction mechanism was provided. A salicylaldehyde determination method in aqueous medium was established based on the supramolecular complex of compound 3 . Under the optimum conditions, the supramolecular complex exhibited a dynamic fluorescence response range for salicylaldehyde from 0.6 to 240×10 −6 molL −1 , with a detection limit of 1×10 −8 molL −1 .
研究领域:
有机化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）