MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 5
·1-11
·
IF 6.232
Zheng Xiaoke,Li Chenghui,He Yaqin,Wu Lan,Hou Xiandeng
In this work, a novel bi-modal imaging probe with enhanced CT contrast efficiency and FL brightness was constructed, in which the combination of a binary CT contrast agent BaHoF 5 and Cu-doped QDs served as a vehicle; hyaluronic acid (HA) was employed as a tumor-targeting ligand. With its CT contrast efficiency about 2.1- and 3.9-fold higher than PEG-BaHoF 5 and Iohexol, the CT contrast efficiency and the fluorescent brightness of the bi-modal probe were both enhanced. Likewise, its fluorescent brightness is almost 6-fold brighter after Cu-doped QDs loading. The most important contribution of this work lies on the proposed strategy. The inherent contradiction of the imaging sensitivity of CT and FL imaging is well balanced and a great CT/FL bi-modal imaging performance is simultaneously obtained even at low concentration (400 μg/mL) of the probe, which was superior to the previous CT/FL bi-modal probes. Moreover, since BaHoF 5 as a binary CT contrast agent was introduced instead of conventional Au and Bi 2 S 3 , the CT/FL bi-modal probe would be more suitable for different patients under different operation voltages. In addition, the in vitro tumor cell imaging also demonstrated a good photo-stability, FL brightness, and tumor-targeting capability of the probe, indicating its great potential in practical bi-modal imaging for further tumor diagnosis and therapy.
A novel bi-modal imaging probe with enhanced CT contrast efficiency and FL brightness was fabricated, in which its CT contrast efficiency was about 2.1- and 3.9-fold higher than PEG-BaHoF 5 and Iohexol, respectively, and its fluorescent brightness almost 6-fold brighter after Cu-doped QDs loading.
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TALANTA
·
2019
·
IF 4.916
Haitao Wang,Xiaokang Na,Shan Liu,Hefei Liu,Lijuan Zhang,Mingzheng Xie,Zicheng Jiang,Fei Han,Yu Li,Shasha Cheng,Mingqian Tan
Ascorbic acid (AA) is an essential vitamin and plays an irreplaceable role in humans’ daily life. Therefore, it is of profound significance to develop effective strategies for AA sensing. Herein, a novel bi-functional sensing strategy was developed by using carbon dots (CDs) and MnO 2 nanosheet as the fluorometric/magnetic signal source. When AA was absence, the fluorescence of CDs was quenched by MnO 2 nanosheet due to the inner filter effect. Neither the fluorescence nor magnetic signal of the nanoprobe can be detected. In the presence of AA, a redox reaction occurred between MnO 2 nanosheet and AA resulting in the generation of magnetic resonance imaging (MRI) response Mn 2+ and decomposing of MnO 2 nanosheet structure, thus leading to the recovery of CDs fluorescence. The detection limit of the AA was determined to be 2.89 μM with a linear range of 0–80 μM in fluorescence mode, and detection limit of 0.776 μM with a linear range of 0–80 μM in MRI mode when used transverse relaxation rate as signal. Furthermore, the developed fluorometric/magnetic bi-functional nanoprobe showed good biocompatibility, high response rate, high selectivity towards AA and could be used to analyses AA in real samples. Moreover, in vivo imaging of AA in mice was achieved in magnetic mode. The fluorometric/magnetic bi-function sensor for AA detection was introduced, which provided a novel strategy for sensor design based on CDs.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 19
·期 1
·118-126
·
IF 4.449
Zijiao Wang,Qianli Ma,Xiangting Dong,Dan Li,Xue Xi,Wensheng Yu,Jinxian Wang,Guixia Liu
A two-dimensional (2D) bi-layered composite nanofibrous film assembled by one-dimensional (1D) nanofibers with trifunctionality of electrical conduction, magnetism and photoluminescence has been successfully fabricated by layer-by-layer electrospinning. The composite film consists of a polyaniline (PANI)/Fe3O4 nanoparticle (NP)/polyacrylonitrile (PAN) tuned electrical–magnetic bifunctional layer on one side and a Tb(TTA)3(TPPO)2/polyvinylpyrrolidone (PVP) photoluminescent layer on the other side, and the two layers are tightly combined face-to-face together into the novel bi-layered composite film of trifunctionality. The brand-new film has totally different characteristics at the double layers. The electrical conductivity and magnetism of the electrical–magnetic bifunctional layer can be, respectively, tunable via modulating the PANI and Fe3O4 NP contents, and the highest electrical conductivity can reach up to the order of 10−2 S cm−1, and predominant intense green emission at 545 nm is obviously observed in the photoluminescent layer under the excitation of 357 nm single-wavelength ultraviolet light. More importantly, the luminescence intensity of the photoluminescent layer remains almost unaffected by the electrical–magnetic bifunctional layer because the photoluminescent materials have been successfully isolated from dark-colored PANI and Fe3O4 NPs. By comparing with the counterpart single-layered composite nanofibrous film, it is found that the bi-layered composite nanofibrous film has better performance. The novel bi-layered composite nanofibrous film with trifunctionality has potential in the fields of nanodevices, molecular electronics and biomedicine. Furthermore, the design conception and fabrication technique for the bi-layered multifunctional film provide a new and facile strategy towards other films of multifunctionality.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yumeng Li,Yingmin Jin,Xuebai Zhang,Mengyu Fu,Ruifan Lin,Guanshu Li,Yueping Xiong
The electrochemical CO 2 reduction reaction (ECO 2 RR) has emerged as a promising technology for achieving carbon neutralization. Even though considerable efforts are dedicated to gain deep insight into the understanding of ECO 2 RR on a mechanism level through density functional theory (DFT) studies, effects of solvent molecules and temperature have long been neglected by conventional DFT calculations as a consequence of limitations in current technologies and computational power of supercomputers. Under this context, the lack of comprehensive understanding over the energy changes in the reaction derived from the only concern on free energy changes between reaction intermediates have arouse an urgent call for exploring feasible calculation options toward generalized theoretical study. Here, a systematic mechanism study is provided toward ECO 2 RR via constrained ab initio molecular dynamics (cAIMD) simulations, in which the effects of solvent water molecules and temperature are taken into consideration to guide the synthesis of single-atom alloy (SAA) catalyst. Consequently, the resultant Pr 0.05 /InBi achieves a maximum Faradic efficiency (FE) of 96.4% and an energy efficacy (EE) of 59.41% for formate. This work offers a novel approach to the design and screening of SAA catalysts, presenting foreseeable future in accelerating the industrial application process of ECO 2 RR.
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Desalination and Water Treatment
·
2024
·
IF 1
Xiaoxia Chen,Yu Ma,Zhengjie Su,Xinxin Zhang,Jinguo Lin,Xiaoyun Chen
Herrin, the lignin extracted from Rice hull , Phyllostachys edulis , Cunninghamia lanceolata, and Populus tomentosa Carrière were used as a soft support to grow Ti-doped Bi 2 (O,S) 3 bimetal oxysulfide catalysts, labeled BT-Rh, BT-Pe, BT-Cl, and BT-Ptc, respectively. The catalytic reduction activity was investigated through the decolorization of methyl orange (MO), methylene blue (MB), and reduction of Cr(VI) solutions under dark. The lignin-supported BiTiOS improved crystallinity, decreased aggregate size, increased specific surface area, and enhanced electrochemical active sites, leading to improve electron transfer and accelerated reduction rates. The catalytic reduction activity of organic dyes and Cr(VI) was significantly improved with lignin-supported BiTiOS. The 5 mg BT-Pe catalyst completely reduced 100 mL of 50 ppm MO, MB, and Cr(VI) solutions in 6, 6, and 18 min, respectively, with the reaction kinetic rate of 0.6782, 1.090, and 0.1189 min −1 , and demonstrated good durability, maintaining a reduction rate of 95 % after six cycles. This work provides a feasible approach combining biomass/inorganic materials to treat industrial wastewater.
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FUEL
·
2024
·
IF 6.7
Zhige Zhang,Guican Bi,Shenglong Zhang,Tao Tan,Jun Xie
The use of biogas as renewable raw material to produce syngas（H 2 /CO ≈ 2）suitable for direct synthesis of methanol has attracted wide attention, but designing promising catalysts with high activity and stability remains a challenge. The catalytic systems used for this process usually have the characteristics of poor stability and easy carbon deposition. Here, Based on the Ce redox cycle and the strong metal-support interaction (SMSI), we designed and synthesized a series of Ni catalysts (denoted as Ni/CeMgO x /BN) with BN interfacial constraints. The abundant oxygen vacancy of reaction-induced Ce redox cycle endows Ni/CeMgO x /BN with excellent carbon resistance, because the ability to activate CO 2 /H 2 O is significantly enhanced. The CO 2 /H 2 O activation and carbon elimination mechanism were comprehensively characterized by in situ H 2 -TPR/CO 2 /H 2 O-TPSR, in situ CH 4 -TPSR/CO 2 /H 2 O-TPO, and FTIR, etc. Ascribed to the appropriate basicity of CeMgO x , homogeneous Ni dispersion, and strong interaction between Ni ultra-small nano particles (NPs) and CeMgO x /BN, Ni/CeMgO x /BN exhibit higher CO 2 /H 2 O adsorption/activation, higher CH 4 activation/dissociation, compared with another samples, which facilitate the formation of active oxygen species and intermediate coke removal, thus enhance the resistance to coke deposition and sintering. At 750 °C, Ni/CeMgO x /BN exhibit satisfying catalytic activity (CH 4 /CO 2 conversation 92 %/52 %) and superior stability (100 h) with negligible deactivation rates.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Huawang Zhao,Yuxin Xie,Bihong Lv,Guohua Jing,Yongdan Li
The CO 2 electrochemical reduction reactions (CO 2 ER) to produce high-value formate are crucial for closing the anthropogenic CO 2 cycle. Modulating the adsorption energy between *OCHO and Bi atoms in Bi-based catalysts could enhance both the activity and selectivity for formate formation. Here, a Bi/BiOBr nanosheet with highly dispersed Bi single atoms in intercalations was synthesized through NaBH 4 treatment of BiOBr, which retained the intercalated Bi atoms after electrolysis (Bi/BiOBr-D). The intercalated Bi atoms optimize the Bi-6p band center (0.016 eV) and charge distribution in Bi/BiOBr-D, enhancing the coupling between the O-2p orbitals of *OCHO and the Bi-6p orbitals as well as the electron transfer dynamics between Bi and the *OCHO intermediate, which improves the stability of the *OCHO intermediate during CO 2 ER. Further studies demonstrate that enhanced *OCHO adsorption reduces the Gibbs free energy barrier for the CO 2 →*OCHO process and suppressing the formation of the *H intermediate. Those advantages lead to high selectivity (FE of 96.83 %) in H-type cell, and excellent activity (j HCOO- of 815 mA/cm²) and productivity (15.22 mmol/h·cm²) in flow cell for formate production over Bi/BiOBr-D sample.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xin Zhang,Zhengwei Xu,Hong Zhang,Zhenchun Li,Bo Ren,Bo Wang,Xiaodong Yang,Junqiu Liu
The Janus adhesive wound dressings exhibit properties analogous to human skin. Specifically, they must possess both adhesive and non-adhesive characteristics to function effectively. The adhesive property ensures secure attachment to the wound site, while the non-adhesive side acts as a protective barrier against external contaminants. In this study, we have developed an integrated Janus antibacterial hydrogel that features a rapid photoresponsive adhesive layer alongside a robust anti-adhesive layer. The anti-adhesion layer hydrogel, referred to as PPAL, exhibits a maximum tensile fracture strength of 738.54 kPa and a fracture strain of 774.02 %. This adhesive layer is referred to as MCDAE. Upon irradiation with 405 nm ultraviolet light, MCDAE rapidly forms a strong bond with PPAL within 10 s, resulting in the formation of a Janus-adhesive hydrogel (MCDAE/PPAL). We synthesized silver nanoparticles (AgNPs) with sizes ranging from 20 to 40 nm in situ within MCDAE hydrogels. Owing to the synergistic effects of quaternary ammonium compounds and AgNPs, Janus MCDAE/PPAL hydrogels exhibited concentration-dependent bacteriostatic activity against both Escherichia coli and Staphylococcus aureus . Furthermore, both in vitro and in vivo experiments have demonstrated that the MCDAE/PPAL dressing possesses superior biocompatibility, exceptional antibacterial properties, effective hemostatic capabilities, and enhanced wound healing potential.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hao Liu,Shunzhe Zhang,Zhaopao Ma,Haochang Chen,Feihong Chen,Kaifeng Wang,Chongyin Zhang,Hua Li
Structural electrolytes with both mechanical and electrochemical properties are of great significance in structural energy storage devices. In this paper, we succeeded to synthesize a novel epoxy resin/hydrogel bicontinuous phase structure electrolyte for the first time by the ingenious design of the hydrophobic curing agent and the substitution of hydrogel for water, and filled the application of bicontinuous electrolyte in aqueous electrochemical energy storage system. The fine structure composition of electrolyte was divided and analyzed in detail by X-ray micro-CT technology. The epoxy resin phase is composed of a reasonable distribution of skeleton structures of various sizes, the largest of which is able to support heavy weights. And a large number of tiny skeletons are distributed to connect the skeletons of different sizes, which improves the three-dimensional interconnection of the epoxy resin phase and makes it excellent mechanical properties (Tensile strength 11.91 Mpa). The large size PVA gel phase constitutes the main pathway for conducting ions. Furthermore, the large-diameter gel phases are coupled in three dimensions with a huge number of micro-diameter gel phases, increasing the number of micro-ion transport channels and decreasing the distance of ion transport with good ionic conductivity (0.15 mS cm −1 ). Using carbon cloth coated in slurry as the electrode, an integrated structural energy storage bearing device was created in situ using layer brush technology, which exhibited exceptional electrochemical performance during in-situ variable load tests. We have successfully solved the construction of aqueous bicontinuous phase structure electrolyte, which made the application of various water chemistry systems in structural energy storage possible.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Sihan Yang,Xuyan Xue,Ziying Wang,Qi Zhu,Xuejiao Wang,Ji-Guang Li
In this work, a series of broad-band green phosphors SrLaScO 4 : x Bi 3+ ( x = 0–0.1) were synthesized using the traditional solid-state method, and the luminescence was effectively enhanced via multi cationic partial substitution strategy. The SrLaScO 4 : x Bi 3+ phosphors all exhibit a wide emission band with a full width at half-maximum (FWHM) of 115–148 nm in the range of 450–700 nm upon excitation at 333 nm, effectively filling the cyan gap and peaking at 505 nm. It is proved that the observed luminescence originates from both the 3 P 1 state of Bi 3+ in [(Sr/La)O 8 ] site and the Bi 3+ - to - Sc 3+ metal to metal charge transfer (MMCT) state. The optimal concentration of Bi 3+ doped SrLaScO 4 phosphor is 1 at%, and the concentration quenching mechanism is the dipole-dipole interaction. Remarkably, the luminescence intensity of the phosphor is 198.4 % increased by partially replacing Sr 2+ ions with Mg 2+ . Due to the good matching of the excitation wavelength of the phosphor with the near-UV chip, a high-quality WLED device with color stability and high color rendering index ( Ra = 92.1) was prepared by combining commercial phosphor with SrLaScO 4 :0.01Bi 3+ phosphor. We anticipate that this work can provide new ideas for finding high-performance phosphors for high color rendering index pc-WLED.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Peng Zhang,Yongfang Rao,Yu Huang,Meijuan Chen,Tingting Huang,Wingkei Ho,Shuncheng Lee,Junbo Zhong,Junji Cao
The inevitable amorphous Bi 2 O 3 on the surface of plasmonic Bi nanospheres serving as the recombination center of hot electron-hole pairs, hindered the transfer of photo-generated hot electrons and production of reactive oxygen species (ROS) seriously. In this study, Bi@amorphous Bi 2 O 3 was transformed to Bi@crystal Bi 2 O 2 CO 3 by secondary hydrothermal reaction. Bi@Bi 2 O 2 CO 3 core–shell photocatalyst exhibited higher visible-light catalytic activity (34.1%) than Bi@Bi 2 O 3 did (12.3%) in terms of NO x removal. Photoelectrochemical, surface photovoltage spectroscopy spectra and Kelvin probe force microscopy measurement results indicate that Bi 2 O 2 CO 3 shell reduced the transmission resistance of hot electrons excited from Bi core. O 2 -TPD, trapping experiments and density functional theory further confirmed that the transferred hot electrons were a help for ROS generation and •O 2 − radicals were the major contributor. This study not only addresses the unsettled issue of surface amorphous Bi 2 O 3 , but also provides a facile method to transform the amorphous shell to crystal phase of core–shell photocatalyst and new insights into the hot electrons separation and the formation of main ROS over the surface crystal transition of plasmonic Bi.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yuanhui Gao,Guogang Xu,Peng Zhao,Lulu Liu,Enliang Zhang
Developing a permeation property and reducing the cost for ceramic microfiltration membrane are significant challenges and target. In this study, a gradient structure ceramic microfiltration membrane with mullite/alumina whisker bi-layer was successfully prepared using the dry-pressing method and one-step co-sintering process. In addition, the co-sintering conditions of substrate and whisker layer, the pore size regulations of whisker layer and emulsified oily wastewater filtration performance of the ceramic microfiltration membranes were systematically investigated. The gradient structure ceramic microfiltration membranes with high bonding strength and flexural strength were obtained under a co-sintering temperature of 1300 °C, and the average pore size of ceramic membrane was approximated in 120 nm, through the coordinated adjustment of the gradient layer by mullite whisker and alumina whisker. The filter performance results showed that with the synergistic effect of high porosity and low tortuosity of the whisker stacking membrane structure, the obtained ceramic membrane exhibited high permeability performance and oil rejection efficiency. The separation fluxes of oil-in-water emulsion with 500 and 1000 mg/L were 901 and 547 L/(m 2 ·h·bar), respectively, and the oil rejection efficiency was higher than 99%. Even after 10 filtration cycles, the separation flux was still steady at 415 L/(m 2 ·h·bar) for the separation process of oil-in-water emulsion with 1000 mg/L. In conclusion, the excellent pore structure of ceramic membrane with whisker layer endowed the separation flux for the oil-in-water emulsion, and the one-step co-sintering indicated a promising practical application for reducing the cost of ceramic microfiltration membranes.
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