JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Jian Lu,Bingang Xu
In recent years, molecularly imprinted membrane (MIM) has exhibited superiority in industrial separation, drug purification, solid-phase extraction and even medical detection owing to its remarkable selectivity. For catechins, however, the reactivity with free radicals limits the traditional construction of MIM towards such molecules. Here in this work, we have developed a bio-inspired MIM towards Epigallocatechin gallate (EGCG, a representative catechin) by the anchoring/imprinting strategy. The covalent interactions based on boronate-affinity supplied an oriented anchoring effect, while the non-covalent interactions from l -cysteine promoted the formation of imprinted sites that are highly matched with template. Mild and efficient imprinting was carried out by self-polymerization of dopamine to avoid the destruction of templates. As a result, remarkable selectivity coefficients (2.70 and 4.58), permselectivity coefficients (more than 3.19 and 3.41) and separation factors (5.18 and 7.00) were achieved on the EGCG-imprinted membrane (EIM), accompanied by the impressive imprinting factor (10.14) and superior regeneration performance (only 4.4% of the decline in five cycles). For deep insight into selective recognition and separation, microscopic and visualized mechanisms of site formation and specific rebinding was proposed by molecular dynamics simulations. Approaches with such an anchoring/imprinting strategy will enrich the avant-garde molecular imprinting strategies, and also expand membrane-based applications.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Di Cheng,Huimin Wu,Chuanqi Feng,Yu Ding,He Mei
In this study, a bifunctional photoelectrochemical (PEC) sensor based on Bi/Bi 2 S 3 /BiVO 4 (Bi-BSV) is prepared by one-step hydrothermal method . Firstly, the results from experiments show that the PEC performances of Bi 2 S 3 /BiVO 4 -X (BSV-X, X = m(Bi 2 S 3 )/m(Bi 2 S 3 + BiVO 4 )) are higher than those of Bi 2 S 3 and BiVO 4 , and BSV-15% has the highest PEC performance. To further improve the PEC properties of BSV-15%, metal-Bi was introduced to the synthesis of Y-Bi-BSV-15% (Y represents the amount of glucose added). Moreover, UV–visible diffuse reflectance spectrum (UV–vis DRS) and photoluminescence (PL) demonstrate that 0.3-Bi-BSV-15% has the widest visible light absorption range and strongest photogenerated carriers separation capability among all composites. Based on the above results, the PEC sensor based on the 0.3-Bi-BSV-15% for detecting hexavalent chromium (Cr (VI)) and hydrogen peroxide (H 2 O 2 ) is built. The results exhibit that 0.3-Bi-BSV-15% has a wider detection range of 2–230 µM and a lower detection limit of 0.094 µM for Cr (VI) detection. While for H 2 O 2 detection, the detection range and detection limit are 1–130,000 µM and 0.089 µM, respectively. Therefore, 0.3-Bi-BSV-15% has potential application in Cr (VI) and H 2 O 2 detection.
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MATERIALS CHEMISTRY AND PHYSICS
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2021
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IF 4.094
Hualun Lv,Xudong Zhang,Jialin Cai,Xin Xie,Yunxiao Fan,Leyan Liu,Jie Ding,Qiang Cai,Yushan Liu
Generally, bi-functionalal electrocatalysts used for overall water splitting (OWS) have good hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance. Herein, RuSe 2 /MoO x composite (RSMC) is constructed through a simple and convenient solid phase reaction (SPR) strategy, and is further studied as a potential electrocatalyst for OWS. At first, we prepared RuO 2 /MoSe 2 composite (RMC) precursor. When the RMC was heat-treated in a N 2 atmosphere, the SPR occurred between RuO 2 and MoSe 2 . Therefore, RMC was converted into RuSe 2 /MoO x composite (RSMC) in-situ , accompanied by the formation of oxygen vacancies (V O ) in the MoO x phase. In this work, the overpotential of RSMC-500 (prepared by annealing the RMC precursor at 500 °C in a N 2 atmosphere) at 10 mA cm −2 under alkaline conditions (1 M KOH) are 58 (HER) and 270 mV (OER), respectively. When using RSMC-500 as anode and cathode materials to make an electrolytic cell , a low cell voltage of 1.57 V is required under alkaline condition to achieve the current density of 10 mA cm −2 . The good performance shows the potential application of RSMC-500 in the field of renewable and clean energy area.
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高影响因子
POLYMER DEGRADATION AND STABILITY
·
2021
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IF 5.03
Dongyue Liu,Pengfei Ji,Tianlong Zhang,Jipeng Lv,Yihua Cui
A bi-DOPO type of prepolymer for flame retardancy epoxy resins with intrinsically flame-retardant was successfully synthesized by reacting of 6,6′-((6,6′-dihydroxy-[1,1′-biphenyl]-3,3′-diyl) bis (propane-3,1-diyl)) bis(dibenzo[c,e][1,2] oxaphosphinine 6-oxide) (DOBP) with bisphenol A. The characterization of the cured epoxy resins, such as cone calorimeter, TGA/infrared, Raman and SEM indicated that DOBP with double 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) structure endowed the epoxy resins with excellent flame retardancy, including limiting oxygen index of 40.0%, V-0 rating in UL-94, remarkable smoke suppression and flame inhibition. The quenching effect of gaseous phase and charring effect of condensed phase of phosphaphenanthrene groups in prepolymer together contributed to the improvement on the flame retardant performance of the epoxy resins. In addition, due to the rigid structure of DOBP molecules, the cured d -FREP possessed high glass transition temperature of up to 192.9°C, and the tensile modulus of which was increased about 55% compared with the neat epoxy resins.
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高影响因子
ADVANCED POWDER TECHNOLOGY
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2021
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IF 4.833
Peifan Qin,Deqi Yi,Jianwei Hao
To investigate thermal shock properties of melamine cyanurate (MCA) for molybdenum disulfide (MoS 2 ) exfoliation, the MoS 2 -MCA superlattice is prepared through self-assembly of pristine MoS 2 , cyanuric acid (CA) and melamine (MA) in water solution. The prepared MoS 2 -MCA is heated in tubular furnace with controlled temperature to obtain two-dimensional (2D)-MoS 2 precursor. Their morphologies are characterized by using Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The obtained 2D-MoS 2 precursor shows a high specific surface area at 336.90 m 2 /g due to bi-layer MoS 2 . TEM and atomic force microscope (AFM) images of 2D-MoS 2 N-methyl-2-pyrrolidone (NMP) solution further confirm the bi-layer MoS 2 exfoliation. The above results prove that MCA is a good thermal shock agent for MoS 2 exfoliation. And the prepared 2D-MoS 2 precursor could also be a good solid reservoir.
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高影响因子
Journal of Tissue Viability
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2021
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IF 2.932
Leilei Sun,Mingbo Li,Tengfei Gong,Jianling Feng
Aim of the study The aim of the current study was to develop collagen-based bi-layered composite dressings with antibacterial property and evaluate the efficiency for wound healing. Materials and methods A bi-layered composite wound dressing was fabricated using two marine biomacromolecules (collagen and chitosan or carboxymethyl chitosan). Non-crosslinked and N-Ethyl-N'-(3-dimethylaminopropyl) carbodiimide/N-Hydroxy succinimide (EDC/NHS) cross-linked collagen sponges fabricated by vacuum freeze-drying technology was used as the inner layer. The medical spun-laced nonwoven coated with chitosan and carboxymethyl chitosan was used as the outer layer. The antibacterial activities against E. coli and S. aureus were evaluated by the inhibition zone assay. Deep second-degree scald model was performed to evaluate the efficiency of bi-layered composite dressings for wound healing. Results In view of comprehensive evaluation of appearance and in vitro antibacterial activity, medical spun-laced nonwoven coated with 3% of chitosan solution was chosen to be used as the optimized preparation conditions to produce the outer layer of composite dressing, which acted as a barrier against microorganisms and provided mechanical support. Furthermore, the results of wound closure and histopathological analysis indicated that EDC/NHS cross-linked collagen-based bi-layered composite dressing was superior to non-crosslinked and commercial products, which stimulated the wound healing process and accomplished deep second-degree scalded skin healing within a time span of 28 days. Conclusion The EDC/NHS cross-linked collagen-based bi-layered composite dressing had immense potential to be applied for an ideal wound dressing for more efficient and faster wound healing. Therefore, the findings provided the essential theoretical basis for great potential of collagen-based composite dressing used in wound healing applications.
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PubMed
高影响因子
Journal of Advanced Ceramics
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2021
·Vol. 10
·期 4
·809-819
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IF 6.707
Yan Tianxiang,Chen Kaiyuan,Li Chengqi,Liu Min,Wang Jie,Fang Liang,Liu Laijun
(1− x )K 0.5 Na 0.5 NbO 3 − x Bi(Zn 2/3 Nb 1/3 )O 3 ((1− x )KNN− x BZN, x = 0.010, 0.015, 0.020, 0.025, and 0.030) lead-free ceramics were fabricated via a traditional solid-state method. The crystal structure, microstructure, dielectric, and conductivity behavior of this system were studied. Combined with X-ray diffraction (XRD) patterns, Rietveld refinement, and dielectric spectroscopy, an orthorhombic phase was determined for x = 0.010, an orthorhombic-tetragonal mixed phase was identified for x = 0.015, and a rhombohedral symmetry appears in 0.020 ⩽ x ⩽ 0.030. Both 0.98KNN−0.02BZN and 0.975KNN−0.025BZN ceramics exhibit stable permittivity and low dielectric loss tangent (tan δ ) in wide temperature ranges owing to the combination of rhombohedral-tetragonal step-like feature and the diffuse phase transition from tetragonal to cubic. The activation energies of dielectric relaxation and conductivity behavior at high temperatures initially decrease slightly, then drop sharply, and finally decline slowly, which could be attributed to microstructure morphologies and the concentration of oxygen vacancies.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2021
·Vol. 96
·期 6
·1732-1741
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IF 3.174
Zhiguo Sun,Jiaming Fan,Run Feng,Menglu Wang,Yue Zhou,Li Zhang
BACKGROUND In recent years, the emission of volatile organic compounds (VOCs) from different sources has caused huge environmental problems. As a ‘green’ terminal treatment technology, photocatalytic technology is a competitive technology that has practical application prospects for the emission reduction of VOCs. The core problem of photocatalysis technology is constructing a photocatalyst with higher activity. RESULTS In this work, a new hierarchical heterostructured photocatalyst of TiO 2 /Bi/Bi 2 MoO 6 was facilely fabricated by solvothermal method with the TiO 2 nanoparticles uniformly distributed on the surface of flower-like Bi 2 MoO 6 nanospheres. Compared with the bare flower-like Bi 2 MoO 6 nanospheres, the band gap width of TiO 2 /Bi/Bi 2 MoO 6 is wider, which helps to improve the Fermi level-derived oxidation–reduction capacity of the catalyst. N 2 adsorption–desorption experiments show that the composite material has a larger specific surface area, which is beneficial to improve the mass transfer efficiency in the gas–solid heterogeneous reaction. Photocatalytic data display that, under irradiation by Xenon lamp for 2 h, the degradation rate of toluene gas over TiO 2 /Bi/Bi 2 MoO 6 reached 26.08%, which is 17.92% higher than that of the bare Bi 2 MoO 6 nanospheres. CONCLUSION These results indicate that coupling TiO 2 could significantly enhance the photocatalytic degradation effect of toluene over the hierarchical heterostructured TiO 2 /Bi/Bi 2 MoO 6 , and this has practical application prospects for the use of photocatalytic technology to treat VOCs pollution. © 2021 Society of Chemical Industry
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APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
Feihui Li,Jingkuo Zhou,Chunjuan Gao,Haixia Qiu,Yunlan Gong,Jinghan Gao,Yu Liu,Jianping Gao
In the present work, magnetically recyclable Bi/Bi 25 FeO 40 -C nanocomposites were synthesized through a one-step hydrothermal approach and then analyzed. The analysis results manifested that non-toxic and biodegradable sodium alginate takes a key role in successful preparation of Bi/Bi 25 FeO 40 -C. Sodium alginate can totally suppresses the formation of BiFeO 3 because it changes the alkalinity of the medium, and at the same time Fe precursor greatly restrains the reduction of Bi 3+ to Bi by sodium alginate, so the final product is Bi/Bi 25 FeO 40 with a small amount of Bi instead of Bi, BiFeO 3 or Bi/BiFeO 3 . Bi/Bi 25 FeO 40 -C showed enhanced photocatalytic activity in hydrogen generation as compared with pure Bi 25 FeO 40 due to the surface plasmonic resonance effect of Bi and electron conductivity of carbon, which promote electron-hole separation and light absorption of the Bi/Bi 25 FeO 40 -C, resulting in high photocatalytic efficiency. The Bi/Bi 25 FeO 40 -C even exhibited higher catalytic efficiency than noble metallic nanoparticles and good reusability in p-nitrophenol reduction. This work provides a green way to prepare Bi/Bi 25 FeO 40 -C for catalytic reactions.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Dandan Cao,Qingyao Wang,Yue Wu,Shuxu Zhu,Yao Jia,Renliang Wang
Bi/Bi 2 MoO 6 /TiO 2 NTs photocatalysts were synthesized on the basis of TiO 2 NTs by a solvothermal method using glucose as the reducing agent. The removal of organic dyes such as RhB and MB and heavy metal ions like Cr(VI) were used to simulate industrial wastewater for the photocatalytic activity assessment of Bi/Bi 2 MoO 6 /TiO 2 NTs. Na 2 S/Na 2 SO 3 solution was used as sacrificial agent to study the photocatalytic hydrogen generation performance of samples. The results showed that Bi 3+ was successfully reduced to metal Bi and deposited on the surface of Bi 2 MoO 6 . The removal efficiencies of RhB, MB and Cr(VI) reached 73.21%, 92.98% and 70.54%, respectively, which confirmed the excellent photocatalytic activity of samples. The photocatalytic hydrogen production performance of the sample was also remarkable and the hydrogen generation rate reached 173.41 μmol·h −1 ·cm −2 . The active species and photocatalytic mechanism of pollutant degradation and hydrogen generation were proposed based on the photoelectrochemical data. The excellent photocatalytic performances of Bi/Bi 2 MoO 6 /TiO 2 NTs will exhibit prospective guidance for the preparation and photocatalytic water splitting of bismuth-based photocatalysts.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 45
·49414
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IF 2.52
Yuntong Liu,Li Liu,Yongri Liang
In this work, we investigated the microphase separation, mechanical, and dynamic mechanical properties of thermoplastic polyurethane elastomers (TPUs) with one-soft segment (polypropylene glycol, PPG, or hydroxyl-terminated polybutadiene, HTPB) or bi-soft segment (PPG and HTPB) using FTIR, XRD, SAXS and amplitude modulated-frequency modulated viscoelastic mode of AFM (AM-FM mode AFM) methods. The results showed that the microphase separation process of hard and soft segments (HS and SS) in TPU containing PPG and HTPB soft segments (PPG-HTPB-PU) was restricted by randomly alternated bi-soft segments, which results in formation of a low content of irregular-shaped hard domain (HD). In addition, the microphase separation of PPG-HTPB-PU induced a triple-phased structure of HD, HTPB rich phase and mesophase. The mesophase of PPG-HTPB-PU was formed of HS, PPG and HTPB segments which were excluded out of HD and HPTB rich domains during microphase separation process. The damping temperature range (at tan δ greater than 0.3) of PPG-HTPB-PU was from −14.6 to 32.1°C (46.5°C) which was more broad than that of TPU containing HTPB soft segment (HTPB-PU). The broad damping temperature range of PPG-HTPB-PU is mainly attributed to the enhanced energy consumption caused by the frictional motions of mixed segments of mesophase.
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高影响因子
ChemNanoMat
·
2022
·Vol. 9
·期 1
·e202200400
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IF 3.82
Bo Zhu,Xu Lu,Jiadang Li,Wenhao Xie,Lifei Wang,Qiang Zhang,Jianfeng Fan,Yun Zheng
Graphical The substitution of iso-valent Bi for Sb is adopted to adjust the thermoelectric transport properties of the undoped Mg 3 Sb 2 compound. The improved power factor and figure of merit are obtained accordingly. Bismuth is the most common alloying element for high-performance Mg 3 Sb 2 -based thermoelectric compounds. However, the electrical and thermal transport data is lacking for undoped Mg 3 (Sb, Bi) 2 solid solutions. In this study, theoretical calculation results show that Bi alloying can reduce the band gap of Mg 3 Sb 2 , favoring the regulation of carrier concentration. Both Mg 3 Sb 2 and Mg 3 SbBi compounds present a single band structure on the valence band maximum at Γ of the Brillouin zone. Incorporating the Bi element can slightly increase the density of states (DOS) on the valence band maximum, which is beneficial for the Seebeck coefficient. Mg 3 Sb 2-x Bi x (0≤x≤0.8) compounds were experimentally prepared via ball milling (BM) combined with the spark plasma sintering (SPS) technique. The carrier concentration, electrical conductivity, and power factor of the samples tend to increase with the increasing Bi content. Bismuth alloying significantly reduces the total thermal conductivity in the low-temperature range, with the lowest value of 0.65 Wm −1 K −1 obtained at ∼400 K for the x=0.2 sample. The peak ZT value of 0.077 at 800 K and the average ZT of 0.051 in the temperature range of 450–800 K are obtained for the x=0.2 sample, which is 93% and 219% higher than those of the unalloyed sample, respectively. This work reveals the Bi-alloying induced transport mechanism and provides fundamental thermoelectric data regarding the undoped Mg 3 Sb 2-x Bi x (0≤x≤0.8) solid solutions.
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高影响因子
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