JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 28
·期 5
·1371-1385
·
IF 2.496
Zhang Xinyi,Gao Mingyu,Yang Pengfei,Cui Xiaochen,Liu Yanan,Li Dianqing,Feng Junting
In this work, two Pt catalysts using anatase and rutile as supports were prepared, and then the support effect on catalytic performance in glycerol oxidation was investigated. Different Pt/TiO 2 catalysts exhibited not so negligible distinction on the product distribution. On one side, the C=O bonds of intermediate glyceraldehyde (GLYAD) highly dissociated in the form of bidentate species through C atom bonding to O atom and O atom bonding to Ti atom of rutile support, which largely promoted the transformation from GLYAD to glyceric acid (GLYA). While, in the case of anatase support, the adsorption form of C=O was monodentate. On another side, the formed GLYA was weakly adsorbed through two O atoms bridging/bonding to two Ti atoms. Due to the longer Ti–Ti distance in anatase, C–C cleavage of GLYA was obviously inhibited. The rutile support with shorter Ti–Ti distance inevitably led to obvious C–C cleavage. The discovery of the support effect could offer an alternative method to controllably regulate product distribution and offers specific perspective on designing efficient catalysts in semicontinuous oxidation reactions.
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POLYMER JOURNAL
·
2021
·Vol. 53
·期 8
·923-935
·
IF 3.08
Yu Li-Ming,Luo Zhen,Gong Cui-Ran,Zheng Yang-Qing,Zhou Zhao-Xi,Zhao Hui,Xu Ying
A new binder, poly(2-propenoic acid, 2-methyl-, 3-[(2-aminoethyl) amino]-2-hydroxypropyl ester) (P-HAEAPMA), is synthesized and applied to silicon/graphite (Si/graphite) anodes in lithium-ion batteries. The Si/graphite anode with the binder exhibits good electrochemical stability. Furthermore, the materials on the discarded Si/graphite/P-HAEAPMA electrode can be recycled for use based on water because the P-HAEAPMA binder is easily soluble in water. The discharge capacity and capacity retention rate of the electrode with reused materials are slightly lower than those of the original Si/graphite/P-HAEAPMA electrode. The binder is rich in polar amino and hydroxyl groups, which not only helps to form strong adhesion between the electrode active material and copper foil but also promotes the transport of Li ions. The electrochemical performance of the electrode with the P-HAEAPMA binder is significantly enhanced compared with that of the electrode with the traditional PVDF binder or water-based LA133 binder. After 305 cycles, a specific capacity of 485.0 mA h g −1 and a capacity retention rate of 74.8% are achieved for the Si/graphite/P-HAEAPMA electrode.
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Nano Research
·
2021
·Vol. 15
·期 1
·255-263
·
IF 8.897
Xue Shuqing,Wu Guanhong,Li Mingzhong,Liu Zihan,Deng Yuwei,Han Wenqian,Lv Xuanyu,Wan Siyu,Xi Xiangyun,Yang Dong,Dong Angang
Heterostructures composed of two-dimensional (2D) nanosheets and zero-dimensional (0D) nanoparticles (NPs) have attracted increasing attention because of the synergy arising from the coupling interactions between the two mixed-dimensional components. Despite recent advances, it remains a challenge to fabricate 2D/0D heterostructures with clean and accessible surfaces, which is highly desirable for the diversity of catalytic, sensing, and energy storage applications. Herein, we report a generalized methodology that enables the facile assembly of sandwich-like 0D/2D/0D heterostructures with facilitated mass-transport channels and exposed surface active sites. A ligand-exchange strategy with HBF 4 is employed to strip off the surface-coating ligands of colloidal NPs, rendering them positively charged and dispersible in polar solvents. This allows subsequent electrostatic assembly of NPs with oppositely charged 2D nanosheets to afford sandwich-like 0D/2D/0D heterostructures. The barely covered surfaces and the advantageous architectures of such sandwich-like 0D/2D/0D heterostructures induce the desired synergistic effect, making them particularly suitable for electrochemical energy storage and conversion. We demonstrate this by employing MXene/NiFe 2 O 4 and MXene/Fe 3 O 4 heterostructures for high-performance electrocatalytic oxygen evolution and supercapacitors, respectively.
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IRANIAN POLYMER JOURNAL
·
2021
·Vol. 30
·期 7
·685-695
·
IF 1.899
Zeng Lelin,Zhou Feixiang,Zhan Xuehui,Zhang Yusheng,Xie Wanyun,Wang Guoxiang,Liang Enxiang
Heavy metal pollution is a serious environmental problem, and adsorption is regarded as an effective technology for metal ions removal. A new absorbent triethylene tetramine (TETA)-modified crosslinked polyacrylonitrile (TETA-modified XL-PAN) was prepared by photo-induced precipitation polymerization of acrylonitrile in water at room temperature using FeC 2 O 4 as photoinitiator and N , N′ -methylenebisacrylamide as crosslinking agent. The TETA provided amidogens, to bond Cu(II) ions and the crosslinking agent was used to improve the stability of adsorbent. FTIR, SEM, BET, and TG were used to characterize the TETA-modified XL-PAN. The FTIR results demonstrate that the XL-PAN was successfully modified by TETA. The SEM images show that TETA-modified XL-PAN powders were agglomerated from 100 to 200 nm spherical particles. TETA-modified XL-PAN was used as an adsorbent to remove Cu(II) ion from wastewater. The effects of contact time, pH, Cu(II) concentration, temperature, and reuse cycles on adsorption were investigated, respectively. Experimental results showed that the adsorption isotherms agreed well with the Langmuir model and a chemical adsorption between TETA-modified XL-PAN and Cu(II) was inferred. After optimizing the experimental conditions, the maximum adsorption capacity of TETA-modified XL-PAN for Cu(II) was 46.6 mg/g with an adsorption time of 8 h. Furthermore, the TETA-modified XL-PAN adsorbent can be well regenerated by acid solutions. After eight regeneration and adsorption processes, the adsorption capacity still reached more than 90% of the first adsorption capacity. These results demonstrated the potential use of TETA-modified XL-PAN as an effective adsorbent for Cu(II) ions removal from wastewater.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 5
·1-10
·
IF 5.833
Wang Dongwei,Wang Jiasheng
The potential of functionalized polypyrrole nanowires (PPyNWs) are demonstrated as a platform for lable-free miRNA detection using electrochemical impedance spectroscopy (EIS). MicroRNAs (miRNAs) detection methods and sensors are mainly challenged by very low concentrations in physiological samples and high similarity among family members. Herein, a sensitive and selective miRNA biosensor was constructed based on electrochemically synthesized PPyNWs, which were functionalized with polyamidoamine dendrimer (PAMAM) by an electro-oxidation method. The prepared PPyNWs/PAMAM hybrid combines the excellent electrical conductivity of conducting polymer PPyNWs with high surface to volume ratio of PAMAM. DNA probes were immobilized onto the PPyNWs/PAMAM hybrid for the construction of the miRNA biosensor. Using the sensitive EIS technique to monitor DNA/miRNA hybridization, the developed biosensor demonstrated excellent sensing performances, such as wide linear range (10 −14 M-10 −8 M) and low detection limit (0.34 × 10 −14 M). Even more encouraging, the response sensitivity of the biosensor was 3.12 times higher than that of the bulk PPy-modified sensor, which proved that the microstructure of the PPy nanowires array can greatly improve the performance of the biosensor. Graphical abstract
An ultrasensitive and selective miRNA biosensor was constructed based on electrochemically synthesized polypyrrole nanowires array (PPyNWs), which were functionalized with polyamidoamine dendrimer (PAMAM) by an electro-oxidation method.
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Journal of Food Measurement and Characterization
·
2021
·Vol. 15
·期 4
·3408-3418
·
IF 2.431
Xie Zhike,He Ming,Zhai Yuhan,Xin Feifei,Yu Shuyan,Yu Shaoxuan,Xiao Haifang,Song Yuanda
Abstract Inhibition of α-glucosidase is considered as an effective approach to treat type 2 diabetes. Therefore, it is of great significance to study the inhibition of this enzyme. In the present study, the inhibitory activity of oleanolic acid (OA) on α-glucosidase and their interaction mechanism were investigated. The inhibition kinetic analysis showed that OA reversibly inhibited α-glucosidase activity in a mixed-type manner with an IC 50 value of 3.04 ± 0.05 µM, and the inhibition followed a multi-phase kinetic process with a first-order reaction. The change of enthalpy and entropy indicated that the binding of OA to glucosidase was mainly driven by hydrophobic interaction and hydrogen bonding, and the binding distance was estimated at 3.51 nm. Synchronous fluorescence, circular dichroism (CD) and Fourier transform infrared spectra (FT-IR) showed that the binding of OA to α-glucosidase induced rearrangement and conformational changes of the enzymes. The molecular docking illustrated that OA entered the active center of α-glucosidase and interacted with the amino acid residues Asp-352 and ultimately inhibiting the enzyme activity. Graphic Abstract
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Nature Communications
·
2021
·Vol. 12
·期 1
·1-9
·
IF 14.919
Xie Qingqiao,Zhuang Yuandi,Ye Gaojun,Wang Tiankuo,Cao Yi,Jiang Lingxiang
Many soft tissues are compression-stiffening and extension-softening in response to axial strains, but common hydrogels are either inert (for ideal chains) or tissue-opposite (for semiflexible polymers). Herein, we report a class of astral hydrogels that are structurally distinct from tissues but mechanically tissue-like. Specifically, hierarchical self-assembly of amphiphilic gemini molecules produces radial asters with a common core and divergently growing, semiflexible ribbons; adjacent asters moderately interpenetrate each other via interlacement of their peripheral ribbons to form a gel network. Resembling tissues, the astral gels stiffen in compression and soften in extension with all the experimental data across different gel compositions collapsing onto a single master curve. We put forward a minimal model to reproduce the master curve quantitatively, underlying the determinant role of aster-aster interpenetration. Compression significantly expands the interpenetration region, during which the number of effective crosslinks is increased and the network strengthened, while extension does the opposite. Looking forward, we expect this unique mechanism of interpenetration to provide a fresh perspective for designing and constructing mechanically tissue-like materials.
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Nano Research
·
2021
·Vol. 15
·期 2
·1338-1346
·
IF 8.897
Li Zhijun,Zhang Mingyang,Zhang Lili,Dong Xiuli,Leng Leipeng,Horton J. Hugh,Wang Jun
Tuning the electronic properties of single atom catalysts (SACs) between the central metal and the neighboring surface atoms has emerged as an efficient strategy to boost catalytic efficiency and metal utilization. Here we describe a simple and efficient approach to create atomically dispersed palladium atoms supported over defect-containing porous ceria nanorod containing palladium up to 0.26 wt.%. The existence of singly dispersed palladium atoms is confirmed by spherical aberration correction electron microscopy and extended X-ray absorption fine structure measurements. This catalyst shows excellent efficiency in hydrodehalogenation reactions at low H 2 pressure under mild conditions, along with satisfactory recyclability and scalability. Density functional theory (DFT) calculations reveal that the high activity stems from the spatial isolation of palladium atoms and the modified electronic structure of palladium confined in defect-containing ceria nanorod. This work may lay the foundation for the facile creation of single atom catalysts within the synthetic community and shed light on the possibility for scale-up production.
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Nano Research
·
2021
·Vol. 14
·期 10
·3439-3445
·
IF 8.897
Li Zixin,Xu Quanlong,Gou Faliang,He Bing,Chen Wei,Zheng Weiwei,Jiang Xu,Chen Kai,Qi Chenze,Ma Dekun
Photoelectrochemical oxygen reduction reaction (ORR) toward H 2 O 2 is highly desirable because only sunlight, O 2 and water are required in the process. However, the corresponding studies are still at its infancy because of the lack of suitable photocathodes, especially inorganic semiconductor photocathodes. In this work, we report CuBi 2 O 4 /CuO (CBO/CuO) heterojunction submicrocrystalline film photocathodes with efficient ORR activity for H 2 O 2 production. The heterojunction film photocathodes were prepared through thermal evaporation of Cu and Bi metals under vacuum and subsequent annealing treatment. Furthermore, the doping of Gd 3+ ions into CBO/CuO could significantly enhance the yield of H 2 O 2 . As a result, the concentration of H 2 O 2 could reach 1.3 mM within 30 min, which is 6 times higher than that obtained on the pristine CBO/CuO photocathode. The theoretical calculations suggested that the introduction of Gd could adjust the electronic structure of CBO surface and promote 2e ORR pathway for selective production of H 2 O 2 . Our work not only provides a new strategy for designing highly efficient photocathode for H 2 O 2 production but also will evoke more interest in photoelectrocatalytic ORR through inorganic semiconductor photocathode.
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Journal of Coatings Technology and Research
·
2021
·Vol. 18
·期 4
·999-1012
·
IF 2.382
Situ Yue,Guo Yanlin,Ji Weiwei,Liu Defei,Wei Dan,Huang Hong
Polyaniline (PANI) encapsulated α-zirconium phosphate (α-ZrP) nanocomposites (PANI/α-ZrP) were prepared by in situ oxidative polymerization and used as anticorrosive filler in epoxy coatings. Water absorption test and electrochemical measurements in 3.5 wt.% NaCl solution were conducted to assess the barrier properties and anticorrosion performances of different coating systems. PANI/α-ZrP composite epoxy coating showed remarkably enhanced corrosion resistance comparing to neat epoxy coating because of “maze effect” from α-ZrP and “passivation effect” from PANI. The α-ZrP nanosheets could be completely encapsulated by PANI with appropriate PANI/α-ZrP mass ratio, and the resulting nanocomposite exhibited optimal corrosion protection properties.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 25
·期 4
·1383-1391
·
IF 2.647
Yang Hongmei,Hu Peiyu,Tang Jing,Cheng Ying,Wang Fang,Chen Zilin
A simple and sensitive bifunctional electrochemical aptasensor for detection of adenosine and thrombin has been developed using gold nanoparticles–electrochemically reduced graphene oxide (AuNPs-ERGO) composite film-modified electrode. Firstly, the reduced graphene oxide film and AuNPs were sequentially immobilized on glassy carbon electrode (GCE) surface. Secondly, thrombin aptamer was immobilized on the modified electrode. Finally, adenosine aptamer was hybridized with it to serve as a recognition element and methylene blue (MB) as electrochemical signal indicator. In the presence of adenosine or thrombin, the sensor recognized it and a conformational change was induced in aptamer, resulting in decrease of the peak current of MB. The linear relation between concentration of adenosine or thrombin and peak current of MB allowed quantification of them. Thanks to the special electronic characteristic of AuNPs-ERGO composite film, sensitivity of sensor was greatly improved. Under optimal conditions, the proposed aptasensor presented an excellent performance in a linear range of 25 nM to 750 nM for adenosine and 0.5 nM to 10 nM for thrombin. Detection limits were estimated to be 8.3 nM for adenosine and 0.17 nM for thrombin, respectively. Moreover, dual-analyte detection of adenosine and thrombin was achieved without potentially increasing the complexity and cost of the assay.
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JOURNAL OF PHYSIOLOGY AND BIOCHEMISTRY
·
2021
·Vol. 77
·期 2
·283-294
·
IF 4.158
Jia Qinghui,Zhang Haihua,Su Yongmei,Liu Xin,Bai Jiangsong,Lang Wuying,Shi Qiumei,Feng Minshan
The ulcerative colitis (UC) is a typical inflammatory bowel disease (IBD) causing great damages, while strictosamide (STR) is a natural alkaloid that possesses strong anti-inflammatory property in infection and inflammation-related diseases. Our study is aimed at evaluating the anti-inflammatory activity of STR in the course of UC. Briefly, male Balb/c mice were treated with 3.5% dextran sulfate sodium (DSS) for 6 consecutive days to establish an acute model of UC, and the administration of gradient concentrations of STR was subsequently performed. Accordingly, colonic pathological alterations including the reduced ratio of colon weight/length, decreased disease activity index (DAI), and attenuated H&E damage were found in UC mice after STR treatment. Based on the analyses of real-time PCR and western blot, downregulation of pro-inflammatory cytokines (TNF-α, IL-1β, and IL-6) was also determined in the colonic tissue of UC mice after the treatment of STR. ELISA and immunohistochemical staining further suggest the relief of inflammation in UC mice with decreased expressions of MPO and iNOS after STR treatment. In addition, STR was also validated to significantly inhibit NF-κB signaling in UC mice by western blot and Electrophoretic Mobility Shift Assay (EMSA). Meanwhile, restricted inflammation was also determined in STR-treated IEC6 and HT-29 cells. The utilization of PDTC, an inhibitor of NF-κB, further demonstrated that STR ameliorated the inflammation by inhibiting the NF-κB signaling in vitro. In summary, our study suggests that STR could be a potential candidate for IBD therapy.
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