Journal of Advanced Ceramics
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2017
·Vol. 7
·期 1
·1-4
·
IF 1.198
Zheng Huiping,Nian Hongqiang,Xia Jinfeng,Zhou Guohong,Jiang Danyu,Li Qiang
To quantify the oxygen content in molten salts, we examined the performance of an yttria-stabilized zirconia solid electrolyte oxygen sensor with a Bi/Bi 2 O 3 reference electrode, focusing on its output accuracy. When the above sensor was tested in a flow of gas with known oxygen partial pressure, \(p_{O_2}\) , a linear relationship between \(lgp_{O_2}\) and the electromotive force (EMF) was observed, and the correlation slope exhibited a positive deviation from Nernstian behavior. EMF measurements performed in molten NaCl–KCl indicated that the oxygen content of this salt mixture increased with increasing oxygen partial pressure in the covering gas, in agreement with Henry’s law. Moreover, the EMF exhibited a linear decrease with increasing melt temperature of molten NaCl–KCl, in agreement with the theoretical model. Finally, a relationship between the structure of molten NaCl–KCl and its oxygen diffusion behavior was established. As a result, the developed sensor was demonstrated to be well suited for determining the oxygen content of molten salts.
研究领域:
材料科学
·
化学工程
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Acta Biomaterialia
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2018
·
IF 6.383
Fenglin Hu,Kaimin Chen,Hong Xu,Hongchen Gu
An ideal nanomaterial for use in the bio-medical field should have a distinctive surface capable of effectively preventing nonspecific protein adsorption and identifying target bio-molecules. Recently, the short-chain zwitterion strategy has been suggested as a simple and novel approach to create outstanding anti-fouling surfaces. In this paper, the carboxyl end group of short-chain zwitterion-coated silica nanoparticles (SiO 2 -ZWS) was found to be difficult to functionalize via a conventional EDC/NHS strategy due to its rapid hydrolysis side-reactions. Hence, a series of bi-functionalized silica nanoparticles (SiO 2 -ZWS/COOH) were designed and prepared by controlling the molar ratio of 3-aminopropyltriethoxysilane (APTES) to short-chain zwitterionic organosiloxane (ZWS) in order to achieve above goal. The synthesized SiO 2 -ZWS/COOH had similar excellent anti-fouling properties compared with SiO 2 -ZWS, even in 50% fetal bovine serum characterized by DLS and turbidimetric titration. Subsequently, SiO 2 -ZWS/COOH 5/1 was chosen as a representative and then demonstrated higher detection signal intensity and more superior signal-to-noise ratios compare with the pure SiO 2 -COOH when they were used as a bio-carrier for chemiluminescence enzyme immunoassay (CLEIA). These unique bi-functionalized silica nanoparticles have many potential applications in the diagnostic and therapeutic fields. Statement of significance Reducing nonspecific protein adsorption and enhancing the immobilized efficiency of specific bio-probes are two of the most important issues for bio-carriers, particularly for a nanoparticle based bio-carrier. Herein, we designed and prepared a bi-functional nanoparticle with anti-fouling property and bio conjugation capacity for further bioassay by improving the short-chain zwitterionic modification strategy we have proposed previously. The heterogeneous surface of this nanoparticle showed effective anti-fouling properties both in model protein solutions and fetal bovine serum (FBS). The modified nanoparticles can also be successfully functionalized with a specific antibody for CLEIA assay with a prominent bio-detection performance even in 50% FBS. In this paper, we also investigated an unexpectedly fast hydrolysis behavior of NHS-activated carboxylic groups within the pure short-chain zwitterionic molecule that led to no protein binding in the short-chain zwitterion modified nanoparticle. Our findings pave a new way for the designing of high performance bio-carriers, demonstrating their strong potential as a robust platform for diagnosis and therapy.
研究领域:
生物医学
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材料科学
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免疫学
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高影响因子
MOLECULES
·
2023
·Vol. 28
·期 5
·2335
·
IF 4.6
Hongquan Kang,Jianzhou Wu,Baohui Lou,Yue Wang,Yilin Zhao,Juanjuan Liu,Shihui Zou,Jie Fan
The rational regulation of catalyst active sites at atomic scale is a key approach to unveil the relationship between structure and catalytic performance. Herein, we reported a strategy for the controllable deposition of Bi on Pd nanocubes (Pd NCs) in the priority order from corners to edges and then to facets (Pd NCs@Bi). The spherical aberration-corrected scanning transmission electron microscopy (ac-STEM) results indicated that Bi2O3with an amorphous structure covers the specific sites of Pd NCs. When only the corners and edges of the Pd NCs were covered, the supported Pd NCs@Bi catalyst exhibited an optimal trade-off between high conversion and selectivity in the hydrogenation of acetylene to ethylene under ethylene-rich conditions (99.7% C2H2conversion and 94.3% C2H4selectivity at 170 °C) with remarkable long-term stability. According to the H2-TPR and C2H4-TPD measurements, the moderate hydrogen dissociation and the weak ethylene adsorption are responsible for this excellent catalytic performance. Following these results, the selectively Bi-deposited Pd nanoparticle catalysts showed incredible acetylene hydrogenation performance, which provides a feasible perspective to design and develop highly selective hydrogenation catalysts for industrial applications.Keywords:acetylene hydrogenation;active sites;selective deposition;palladium;bismuth
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Yuehui Liu,Yueyi Li,Xuguang Liu,Jiaxin Li,Yanjie Feng,Xia Li
Oxygen vacancy-rich Bi/Bi 3 TaO 7 binary nanomaterials were obtained by a simple in situ reduction . The as-prepared composite exhibited superior photocatalytic activity for the degradation of RhB compared to the single material under the visible light range. The degradation rate of the optimal sample reached 92% within 120 min, 12.25 times that of the pure Bi 3 TaO 7 . XRD and HRTEM characterization showed that the Bi metal obtained through in situ reduction was loaded on the Bi 3 TaO 7 nanostructure. In addition, XPS and EPR indicated a significant increase in the oxygen vacancy content of the composites. The time-resolved transient fluorescence spectroscopy and photocurrent results proved that the separation rate of photoexcited carriers and the corresponding ability of photoelectrons are greatly increased. It is due to the synergistic effect of the unique photo-reaction excitation pathway induced by bismuth metal plasma resonance and oxygen vacancies, which not only extends the photo-reaction to the infrared region but also increases the carrier residence time, and this is the fundamental reason for the excellent photocatalytic performance of the composite material. The h + is the main reactive radical of the reaction, and •O 2 − also plays a role. Based on the above characterization study, we propose a possible photoreaction mechanism for the synergistic oxygen vacancy and Bi metal of Bi/Bi 3 TaO 7 .
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Materials
·
2023
·Vol. 16
·期 1
·415
·
IF 3.4
Xiaozhou Cao,Hao Wang,Tianrui Liu,Yuanyuan Shi,Xiangxin Xue
Deep eutectic solvent (DES) has been widely used in the field of metal electrodeposition as an economical and environmentally friendly green solvent. Metallic bismuth films were prepared by electrodeposition from choline chloride-malonic acid (ChCl-MA) deep eutectic solvent (DES) containing BiCl3. Fourier transform infrared (FTIR) spectroscopy and Raman spectroscopy were used to study the structure of ChCl-MA-BiCl3, and the results showed that Bi(III) was in the form of [BiCl6]3−ions. The viscosity of ChCl-MA-BiCl3ranges from 200 to 1200 mPa·s at temperatures from 363 K to 323 K. The conductivity of 0.01 M Bi(III) in ChCl–MA is 3.24 ms·cm−1at 363 K. The electrochemical behavior and electrodeposition of Bi(III) in DES were investigated by cyclic voltammetry (CV) and chronoamperometry. The results showed that the electrodeposition reaction was a quasi-reversible reaction controlled by the diffusion and the nucleation of bismuth was a three-dimensional instantaneous nucleation. The diffusion coefficient of Bi(III) in ChCl-MA was 1.84 × 10−9cm2·s−1. The electrodeposition product was observed by scanning electron microscopy (SEM), and the results showed that the deposition potential has a significant influence on the morphology of the bismuth film. X-ray photoelectron spectroscopy (XPS) shows that bismuth and bismuth oxides are present in the deposited film obtained by electrodeposition.Keywords:bismuth;deep eutectic solvent;electrodeposition;cyclic voltammetry
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Fei Hu,Jinhe Wei,Xiong Shen,Lin Chen,Zhongming Wang,Xin Peng,Chenglong Lv,Qiuyun Ouyang
The Bi/Ti 3 C 2 T x composites were synthesized by a hydrothermal method . Then the Bi/Ti 3 C 2 T x powder was dispersed into methyl methacrylate (MMA) to fabricate the (Bi/Ti 3 C 2 T x ) 2–6 /polymethyl methacrylate (PMMA) organic glasses. The crystalline structure and phase of the Bi/Ti 3 C 2 T x were measured by the X-ray diffraction. The photoluminescence (PL) spectra and the electrochemical impedance spectra (EIS) of the Bi/Ti 3 C 2 T x were measured to prove the enhanced optical and electrical properties. The nonlinear optical (NLO) properties of the (Bi/Ti 3 C 2 T x ) 2–6 /PMMA organic glasses were investigated by the Z-scan technique. The (Bi/Ti 3 C 2 T x ) 2–6 /PMMA organic glasses exhibit the reverse saturable absorption (RSA) and self-defocusing effects. Compared to the (Bi) 2 /PMMA and (Ti 3 C 2 T x ) 2 /PMMA organic glasses, the (Bi/Ti 3 C 2 T x ) 2–6 /PMMA organic glasses exhibit the enhanced NLO properties. Among three different amount Bi/Ti 3 C 2 T x /PMMA organic glasses, (Bi/Ti 3 C 2 T x ) 4 /PMMA organic glass exhibits the strongest RSA and self-defocusing effects with β eff = (6.34 ± 1.90)× 10 2 cm·GW −1 and γ = (–3.52 ± 0.07)× 10 −4 cm 2 ·GW −1 . The enhanced RSA and self-defocusing effect of the (Bi/Ti 3 C 2 T x ) 2–6 /PMMA organic glasses make them exhibit the excellent optical limiting (OL) performance. In addition, the Bi/Ti 3 C 2 T x composites show excellent electrochemical performance as an electrode material for energy storage systems. The resultant Bi/Ti 3 C 2 T x electrode yields a high specific capacity of 68.5 mAh·g −1 at a current density of 1 A·g −1 , which is approximately 4.2 and 6.1 times than those of the Bi and Ti 3 C 2 T x electrodes, respectively. The experimental results exhibit the Bi/Ti 3 C 2 T x is highly promising for energy storage and OL devices.
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 46
·22419-22426
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IF 3.925
Liran Liu,Hanping Fu,Yating Zeng,Li Feng,Tianxiang Zhang,Qingshuang Liang,Xiufeng Xiao
The development of high-efficiency economic photocatalysts for the production of hydrogen peroxide (H2O2) is of great significance for solar-to-fuel conversion. Bismuth oxychloride (BiOCl) shows great potential for photocatalytic H2O2 production, but the rapid recombination of electron–hole pairs reduces its photocatalytic performance. Herein, a series of Bi nanoparticle modified BiOCl (Bi/BiOCl) composites is constructed by an in situ chemical reduction to boost the spatial charge separation and transportation to enhance the photocatalytic performance for H2O2 production. Benefiting from the synergistic effects of localized surface plasmon resonance, the formation of Schottky barriers, and the in situ fabricated heterojunction that results in strong interfacial forces and tight contact, the obtained Bi/BiOCl composites exhibit enhanced photocatalytic capability for H2O2 production; the best sample can enable an impressive H2O2 production rate of 108 mmol g−1 h−1, which is much higher than that of individual BiOCl. The present work provides a clear understanding of the mechanisms of Bi nanoparticle modified BiOCl composites for photocatalytic H2O2 production, which will be useful for the development of catalysts toward solar-to-fuel conversion.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Xin Jin,Guangrong Liu,Chongzuo Bao,Dong Chen,Xiaohu Du,Kunyuan Chen,Li Rao,Zilin Huang,Qiang Huang
Titanium pyrophosphate (TiP 2 O 7 ) adsorbent was prepared by sol–gel combined with sintering method. The products were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR), Raman, transmission and scan electron microscope (TEM/SEM) technologies. The results showed that the cubic phase of TiP 2 O 7 has a uniform polyhedral morphology, and most particles are 200–600 nm in size. The submicron scale TiP 2 O 7 particles were first assessed to adsorb aqueous Bi(III) ions. It is found that TiP 2 O 7 micro-particles exhibited excellent capture capability ( Q m = 42.54 mg g −1 , 298.5 K), fast adsorption rates (>99 % within 30 min) for toxic Bi(III) and high Bi(III) selectivity ( K d Bi = 5.6 × 10 4 mL g −1 ) in the presence of various competitive ions, with the order of Bi(III) ≫ Pb(II) ≫ Cu(II) > Fe(II) > Al(III) > Zn(II). The adsorption kinetics conformed to the pseudo-second-order model, equilibrium adsorption satisfied the Langmuir equation, and the adsorption process was thermodynamically spontaneous. Chemisorption was inferred as the adsorption mechanism, and surface hydroxylated functional groups were considered the adsorptive sites. The reusability and testing of actual samples demonstrated the practicality of TiP 2 O 7 adsorbents in water environment treatment.
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Bio-Design and Manufacturing
·
2022
·Vol. 5
·期 3
·540-555
·
IF 5.887
Sun Yage,Gao Ziwei,Zhang Xiaoping,Xu Ziyang,Zhang Yahan,He Binbin,Yang Rong,Zhang Qian,Yang Qiang,Liu Wenguang
Periosteum, a membrane covering the surface of the bone, plays an essential role in maintaining the function of bone tissue—and especially in providing nourishment and vascularization during the bone regeneration process. Currently, most artificial periostea have relatively weak mechanical strength and a rapid degradation rate, and they lack integrated angiogenesis and osteogenesis functions. In this study, a bi-layer, biomimetic, artificial periosteum composed of a methacrylated gelatin–nano-hydroxyapatite (GelMA-nHA) cambium layer and a poly (N-acryloyl 2-lycine) (PACG) -GelMA-Mg 2+ fibrous layer was fabricated via 3D printing. The GelMA-nHA layer is shown to undertake the function of improving osteogenic differentiation of rat bone marrow mesenchymal stem cells with the sustainable release of Ca 2+ from nHA nanoparticles. The hydrogen-bonding-strengthened P(ACG-GelMA-L)-Mg 2+ hydrogel layer serves to protect the inner defect site and prolong degradation time (60 days) to match new bone regeneration. Furthermore, the released magnesium ion exhibits a prominent effect in regulating the polarization phenotype of macrophage cells into the M2 phenotype and thus promotes the angiogenesis of the human umbilical vein endothelial cells in vitro. This bi-layer artificial periosteum was implanted into a critical-sized cranial bone defect in rats, and the 12-week post-operative outcomes demonstrate optimal new bone regeneration. Graphic abstract
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Haiying Wang,Dun Wei,Yingjie He,Haoyu Deng,Bichao Wu,Lvji Yan,Haiyin Gang,Yiyun Cao,Linfeng Jin,Liyuan Zhang
Electrochemical deionization (EDI) is hopefully the next generation of water treatment technology. Bismuth (Bi) is a promising anode material for EDI, due to its high capacity and selectivity toward Cl–, but the large volume expansion and severe pulverization aggressively attenuated the EDI cycling performance of Bi electrodes. Herein, carbon-layer-encapsulated nano-Bi composites (Bi@C) were prepared by a simple pyrolysis method using a Bi-based metal–organic framework as a precursor. Bi nanoparticles are uniformly coated within the carbon layer, in which the Bi–O–C bond enhances the interaction between Bi and C. Such a structure effectively relieves the stress caused by volume expansion by the encapsulation effect of the carbon layer. Moreover, the introduction of a carbon skeleton provides a conductive network. As a consequence, the Bi@C composite delivered excellent electrochemical performance with a capacity of 537.6 F g–1 at 1 mV s–1. The Cl– removal capacity was up to 133.5 mg g–1 at 20 mA g–1 in 500 mg L–1 NaCl solution. After 100 cycles, the Bi@C electrode still maintains 71.8% of its initial capacity, which is much higher than the 26.3% of the pure Bi electrode. This study provides a promising strategy for improving EDI electrode materials.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Pan Zhang,Yuanyuan Cui,Yongji Yao,Wei Wei,Yuanyuan Sun,Kaiqiang Zhang,Yanfeng Gao
Developing cheap and efficient materials for enhancing the photochromic performance upon visible or solar light irradiation is a hot-topic in the field of solar energy conversion . However, few inorganic photochromic materials can provide satisfying applications due to their low coloring and bleaching efficiency as well as slight color change. Here, we synthesized the bismuth tungstate (Bi 2 WO 6 ) ultrathin nanosheets with the thickness of 1.29 nm via co-precipitation-hydrothermal method using cetyltrimethylammonium bromide (CTAB) surfactant . The prepared ultrathin nanosheets show the similar crystalline structure but a narrowed band gap of 2.73 eV, as compared with the 2.86 eV of pristine Bi 2 WO 6 . Additionally, the numerous [WO 6–x Br 2x ] species and abundant “Bi–O″ vacancy pairs on the surface can serve as active sites that suppress the recombination of photogenerated electron-hole pairs and capture the photogenerated electrons to form the color trapping centers. As a result, Bi 2 WO 6 ultrathin nanosheets exhibit excellent photochromic behavior upon solar light irradiation (coloring time of 5 s) and under dark atmospheric treatment (bleaching time of 35 min) compared with WO 3 -based photochromic materials (coloring time of 20–60 min and bleaching time of 3 h days).
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Journal of Tissue Viability
·
2021
·
IF 2.932
Leilei Sun,Laihao Li,Yueqi Wang,Mingbo Li,Shumin Xu,Chengpeng Zhang
Aim of the study The aim of the study was to fabricate collagen-based composite dressings, evaluate the efficiency for wound healing and reveal the mechanism of promoting wound healing. Materials and methods An innovative bi-layered composite wound dressing was developed using two marine biomacromolecules (collagen and chitosan). Full-thickness skin defect model was performed to evaluate the wound healing activity in vivo . The levels of inflammatory cytokines including tumor necrosis factor alpha (TNF-α), interleukin (IL-1, IL-6, IL-8) and growth factors like transforming growth factor beta (TGF-β), vascular epidermal growth factor (VEGF) and basic fibroblast growth factor (bFGF) were quantified by ELISA assays. The total amount of collagen was quantified by hydroxyproline content. The proliferation and viability of fibroblast cells cultured on collagen sponges were determined by CCK-8 assay. Results The results of wound closure and histopathological analysis indicated that non-crosslinked collagen-based bi-layered composite dressing stimulated wound healing, accelerated re-epithelialization and accomplished wound healing within a time span of 28 days. The results of levels of inflammatory cytokines and growth factors showed that collagen-based composite dressings could reduce the inflammatory response and upregulate growth factors levels to accelerate the wound healing. The results of hydroxyproline content and CCK-8 assay indicated that collagen-based composite dressings could also promote collagen synthesis and fibroblasts viability and proliferation. Conclusion The non-crosslinked collagen-based bi-layered composite dressing could be applied for an efficient and ideal wound dressing. Therefore, the findings provided the essential theoretical basis for the potential of collagen-based composite dressing applied in wound healing fields.
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