Scientific Reports
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2021
·Vol. 11
·期 1
·1-13
·
IF 4.38
Niu Meiyun,Yan Haifeng,Xiong Yuping,Zhang Yueya,Zhang Xinhua,Li Yuan,da Silva Jaime A. Teixeira,Ma Guohua
Sandalwood ( Santalum album L.) is famous for its unique fragrance derived from the essential oil of heartwood, whose major components are santalols. To understand the mechanism underlying the biosynthesis of santalols, in this study, we cloned two related genes involved in the mevalonate pathway in S. album coding for acetyl-CoA C-acetyl transferase (AACT) and 3-hydroxy-3-methyglutary-CoA synthase (HMGS). These genes were characterized and functionally analyzed, and their expression profiles were also assessed. An AACT gene designated as SaAACT (GenBank accession No. MH018694) and a HMGS gene designated as SaHMGS (GenBank accession No. MH018695) were successfully cloned from S. album . The deduced SaAACT and SaHMGS proteins contain 415 and 470 amino acids, and the corresponding size of their open-reading frames is 1538 bp and 1807 bp, respectively. Phylogenetic trees showed that the SaAACT protein had the closest relationship with AACT from Hevea brasiliensis and the SaHMGS proteins had the highest homology with HMGS from Siraitia grosvenorii . Functional complementation of SaAACT and SaHMGS in a mutant yeast strain deficient in these proteins confirmed that SaAACT and SaHMGS cDNA encodes functional SaAACT and SaHMGS that mediate mevalonate biosynthesis in yeast. Tissue-specific expression analysis revealed that both genes were constitutively expressed in all examined tissues (roots, sapwood, heartwood, young leaves, mature leaves and shoots) of S. album , both genes showing highest expression in roots. After S. album seedlings were treated with 100 μM methyl jasmonate, the expression levels of SaAACT and SaHMGS genes increased, suggesting that these genes were responsive to this elicitor. These studies provide insight that would allow further analysis of the role of genes related to the sandalwood mevalonate pathway in the regulation of biosynthesis of sandalwood terpenoids and a deeper understanding of the molecular mechanism of santalol biosynthesis.
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MICROCHIMICA ACTA
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2020
·Vol. 187
·期 11
·1-10
·
IF 6.232
He Hongliang,Cao Min,Hu Jingwan,Zhu Ling,Su Chang,Du Shuhu,Yang Jian,Tang Yulin,Chen Lina
A novel molecularly imprinted ratiometric fluorescent probe was fabricated by simple sol–gel polymerization for selective and sensitive assay of C-type natriuretic peptide (CNP) in biosamples. Both the nitrobenzoxadiazole (NBD) and carbon dots (CDs) were located on the surface of silica, used as the detection signal and reference signal, respectively. For the turn-on-based probe, the fluorescence intensity of NBD could be quantitatively enhanced by CNP based on the strategy of photo-induced electron transfer (PET), while the fluorescence of CDs remained unchanged. The obtained probe exhibited excellent recognition selectivity and fast kinetics to CNP templates, and also showed good stability. The linear range of CNP determination was 5–80 pg mL −1 with a low detection limit of 2.87 pg mL −1 . Finally, the probe was successfully applied to determine CNP in human serum samples and attained high recoveries between 97.3 and 104% with precisions below 4.7%. The result indicates that the proposed method has promising potential for the assay of trace peptides in complex matrices.
Schematic illustration for the formation and determination mechanism of the probe
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CHEMISTRY-A EUROPEAN JOURNAL
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2020
·Vol. 26
·期 56
·12882-12890
·
IF 4.857
Qiongguang Li,Yanhong Wang,Qiangqiang Tan,Ziyi Zhong,Fabing Su
Graphical Hollow core–shell anode : An SnO 2 @C@Co-NC anode material with hollow core–shell structure was structurally designed and synthesized by a heteroatom-doping and multiconfinement approach. This material can efficiently alleviate the volume expansion of the SnO 2 -based anode materials and exhibits much-enhanced electrochemical performance, including high rate performance and cycle stability, as well as superior capacity. To overcome the drawbacks of the structural instability and poor conductivity of SnO 2 -based anode materials, a hollow core–shell-structured SnO 2 @C@Co-NC (NC=N-doped carbon) composite was designed and synthesized by employing the heteroatom-doping and multiconfinement strategies. This composite material showed a much-reduced resistance to charge transfer and excellent cycling performance compared to the bare SnO 2 nanoparticles and SnO 2 @C composites. The doped heteroatoms and heterostructure boost the charge transfer, and the porous structure shortens the Li-ion diffusion pathway. Also, the volume expansion of SnO 2 NPs is accommodated by the hollow space and restricted by the multishell heteroatom-doped carbon framework. As a result, this structured anode material delivered a high initial capacity of 1559.1 mA h g −1 at 50 mA g −1 and an initial charge capacity of 627.2 mA h g −1 at 500 mA g −1 . Moreover, the discharge capacity could be maintained at 410.8 mA h g −1 after 500 cycles with an attenuation rate of only 0.069 % per cycle. This multiconfined SnO 2 @C@Co-NC structure with superior energy density and durable lifespan is highly promising for the next-generation lithium-ion batteries.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Ruzhen Xie,Yanbin Jiang,Andac Armutlulu,Ziye Shen,Bo Lai,Hui Wang
In this work, cost-effective, magnetic carbon-supported Fe@Ti composite (Fe@Ti/Cs) with abundant active sites was synthesized by one-step carbothermal reduction of ilmenite with the assistance of microwave oven and utilized as a highly efficient persulfate (PS) activator for the wastewater purification. The coexistence of Fe 0/2+/3+ , Ti 3+/4+ and oxygen vacancies on Fe@Ti/Cs was found to favor for the electron transfer to PS, which facilitate the generation of reactive oxygen species (ROS). Catalytic experiment results showed that the Fe@Ti/C-4 produced from ilmenite/carbon with a mass ratio of 4:1 exhibited the best catalytic activation performance towards PS for the degradation of Rhodamine B (RhB). Usage of merely 0.12 g/L Fe@Ti/C-4 enabled the removal of 94.01% RhB (200 mg/L) within 30 min in the PS containing system, significantly outperforming ilmenite + PS (29.29%) and carbon + PS (49.91%) systems tested under the same conditions. The physico-chemical properties of the produced Fe@Ti/Cs before and after the reaction were carefully characterized. Radical scavenging experiments and electron paramagnetic resonance (EPR) analysis were carried out to better understand the underlying mechanism. The results indicate that oxygen vacancies in Fe@Ti/C-4 promoted the electron transfer and participated in the transition metal redox cycle to generate ROS in the PS-containing system, which was highly efficient for degrading RhB into small molecules and finally enabling mineralization. This work offers a new perspective for designing highly efficient and stable PS activators with long life derived from natural ore for environmental remediation.
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Nanomaterials
·
2020
·Vol. 10
·期 9
·1629
·
IF 4.324
Ranran Jiao,Li Zhao,Shuli Zhou,Yanjun Zhai,Denghu Wei,Suyuan Zeng,Xianxi Zhang
In this study, a simple method was adopted for the synthesis of MnO@C nanocomposites by combining in-situ reduction and carbonization of the Mn3O4precursor. The carbon content, which was controlled by altering the annealing time in the C2H2/Ar atmosphere, was proved to have great influences on the electrochemical performances of the samples. The relationships between the carbon contents and electrochemical performances of the samples were systematically investigated using the cyclic voltammetry (CV) as well as the electrochemical impedance spectroscopy (EIS) method. The results clearly indicated that the carbon content could influence the electrochemical performances of the samples by altering the Li+diffusion rate, electrical conductivity, polarization, and the electrochemical mechanism. When being used as the anode materials in lithium-ion batteries, the capacity retention rate of the resulting MnO@C after 300 cycles could reach 94% (593 mAh g−1, the specific energy of 182 mWh g−1) under a current density of 1.0 A g−1(1.32 C charge/discharge rate). Meanwhile, this method could be easily scaled up, making the rational design and large-scale application of MnO@C possible.Keywords:MnO@C nanocomposites;carbon content;current density;lithium-ion battery;transition metal oxide anode
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Journal of Materials Chemistry B
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2020
·Vol. 8
·期 37
·8671-8683
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IF 5.344
Zhen Xiang,Yiyao Qi,Yusheng Lu,Zhenrong Hu,Xiao Wang,Wenwen Jia,Jingzhou Hu,Jiansong Ji,Wei Lu
Multifunctional nanomedical platforms have broad prospects in imaging-guided combination therapy in cancer precision medicine. In this work, metal–organic framework (MOF)-derived novel porous Fe3O4@C nanocomposites were developed as an intelligent cancer nanomedical platform for combined cancer therapy with MRI-guided magnetic-triggered hyperthermia and chemotherapy functions. The magnetic behavior, porous character and good surface modification endowed this smart nanoplatform with favorable biocompatibility, high-efficiency MRI imaging, magnetic-triggered on-demand DOX release function, and synergistic therapy of magnetic hyperthermia and chemotherapy, which proposed an all-in-one platform for cancer therapy. Additionally, in vivo animal experiments verified the significant suppression of malignant tumor growth with negligible side effects, which were attributed to the consecutive 13 day synergistic therapy of magnetic hyperthermia and chemotherapy in one. To be specific, Fe3O4@C-PVP@DOX significantly decreases the volume (2.5 to 0.44 of tumor volume ratio) and weight (0.49 g to 0.10 g) of tumors after magnetic-triggered hyperthermia and chemotherapy treatments. Moreover, no big difference of body weight and associated damage was observed among all major organs. Therefore, owing to its high-efficiency combined therapy of magnetic-triggered hyperthermia and chemotherapy, this smart nanoplatform holds great potential application in the precise treatments of clinical cancer.
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JOURNAL OF CATALYSIS
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2020
·
IF 7.888
Yingchun Guo,Lei Feng,Changcheng Wu,Xiaomei Wang,Xu Zhang
Rational design and fabrication of metal–organic framework (MOF)-derived ordered hierarchical macro-/meso-/microporous N-doped carbon materials featured with the atomically dispersed metal atoms can effectively enhance their catalytic performance. Herein we develop a template-assisted strategy, namely the confined growth and pyrolysis of single-crystalline zeolite imidazolate framework-8 (ZIF-8) in three-dimensional ordered template voids, to create hierarchical porosity in MOFs-derived N-doped carbon materials. The as-synthesized single-atom Zn on N-doped hierarchically ordered porous carbon polyhedrons (Zn-N-HOPCPs) show integrated Lewis acid (single-atom Zn) and base sites (pyridinic N), high surface area (1128 m 2 ·g −1 ), large pore volume (0.90 cm 3 ·g −1 ), periodically interconnected open windows (~55 nm), highly accessible micro/mesopore channels (0.55, 0.8, 1.2, and 4 nm), and abundant Zn content (5.8 wt%). The hierarchical nanoarchitecture (macro-/meso-/micropores) significantly facilitates mass transfer for bulky-molecule-involved reactions and exposes inside active sites, resulting in satisfactory CO 2 photoconversion under mild conditions. The strategy presented here sheds light on the design and fabrication of various hierarchically ordered porous carbon decorated with atomically dispersed metal atoms for other important applications.
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CARBON
·
2020
·
IF 8.821
Xueliang Fan,Hongbin Zhang,Boxu Gao,Haiyang Lu,Luyao Zheng,Xue Yang,Yahong Zhang,Qingsheng Gao,Yi Tang
To explore high-performance carbide catalysts for hydrogen evolution reaction (HER), the rational design of hierarchically porous catalyst benefitting active-site exposure and fast mass transport is extremely demanded. Herein, Chinese ink (CI), used for writing and drawing for thousands of years, is adopted to promote the formation of co-assembly of carbon nanoparticles and Mo-based lamellar organic-inorganic hybrids, which, after pyrolysis in Ar atmosphere , is further converted to 3D hierarchically structured and porous MoC x /C nanocomposites (HSP-MoC x /C) for high-efficient HER. Their skeleton structure, porosity, carbon amounts, phase composition and active species dispersity are well modulated by simply tuning the CI dosage in starting mixture, and its mechanism is monitored via a series of physicochemical characterization techniques. The optimal composite exhibits remarkable HER activity with low overpotentials of 112 and 86 mV at current density of 10 mA cm −2 , and the small Tafel slopes of 52 and 50 mV dec −1 in 0.5 M H 2 SO 4 and 1 M KOH solution, respectively. Such performance stems from the combined effects of enhanced ion/mass transport, abundant exposed active sites and high conductivity due to the 3D hierarchically skeleton architecture of catalysts. This work paves a new strategy to design hierarchically porous materials for chemical conversion and energy storage .
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Yinan Gu,Guixiang Teng,Xiaodong Jin,Liping Wang,Zengwei Qiang,Weigang Ma,Chun Zhang
A coral-like ZnO/C-ZnFe2O4 (Z/C-ZFO) photocatalyst was synthesized by simulating the structural characteristics of coral since its structure is conducive to the capture and absorption of light. The synthesis process involves a two-step process. First, flowerlike hierarchical precursors were synthesized through a hydrothermal self-assembled route. Next, the precursors were thermally annealed in a nitrogen atmosphere after doping with a zinc source. In addition to forming heterojunctions that enhance its photocatalytic properties, the coral-like nanostructures endowed Z/C-ZFO with significant light-harvesting efficiency. Finally, the photocatalyst was used for antibacterial applications against Escherichia coli and Staphylococcus aureus bacteria. The results showed that the optimized sterilization efficiencies toward E. coli and S. aureus bacteria were 99.4 and 98.0%, respectively, combined with excellent cycling stability. The method of designing and synthesizing coral-like structures in this study may also be extended to the synthesis of other photocatalytic and optical materials.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Xueying Li,Yalin Xu,Hui Wu,Xiu Qian,Lizhuang Chen,Yuanyuan Dan,Qing Yu
The porous Fe 3 O 4 nanoaggregates were fabricated by the carbon polyhedron as templates through the hydrothermal method . The carbon polyhedron was obtained by the carbonization of ZIF-67 and subsequent acid treatment. The finial porous Fe 3 O 4 nanoaggregates possess high specific area of 547.5 m 2 g −1 with pore volume of 0.375 cm 3 g −1 . Such unique structures facilitate electrode materials fully exposed to electrolyte solution and maintain the structural stability during fast electrochemical reaction processes. Thereby, porous Fe 3 O 4 nanoaggregates exhibit high specific capacity of 868.7 C g −1 at 2 A g −1 in the wide potential window of −0.90 - 0.45 V in 3 M KOH. After 3000 cycles at 2 A g −1 , the electrode material retains 771.8 C g −1 . Even at high current density of 20 A g −1 , the electrode still delivers 456.1 C g −1 , which is outstanding of other Fe 3 O 4 nanomaterial for supercapacitor . Furthermore, the Fe 3 O 4 //AC asymmetry supercapacitor (3 M KOH as electrolyte) exhibits high energy density of 24.2 Wh kg −1 at power density of 801.1 W kg −1 with excellent cycling performance.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yuan Zhuang,Jiemin Liu,Siyi Yuan,Ben Ge,Hao Du,Chen Qu,Haiying Chen,Chuandong Wu,Wenhui Li,Yan Zhang
Volatile organic compound (VOC) elimination technologies have been investigated to alleviate health damage and to reduce serious environmental risks. The degradation of hydrophobic and refractory VOCs calls for advanced oxidation processes with high degradation efficiency and low-level toxic byproduct generation. In this study, core-shell Fe 3 O 4 @C was employed as an advanced oxidation microreactor for hydrophobic and refractory VOC removal during the Fenton process, and octane was chosen as a typical target pollutant. The average octane removal efficiency increased by 41.6%, while the main byproduct concentrations decreased by 65.8% in the initial 60 min compared with Fe 3 O 4 . Density functional theory (DFT) calculations revealed the key role of Fe O C bond during the regeneration of Fe(II) species, and the enhanced octane adsorption process by the carbonyl sites. Calculation of mass transfer enhancement factor proved that the carbon shell was critical during mass transfer process. The advanced oxidation mechanism was investigated by detection and measurement of byproducts and hydroxyl radicals and XPS analysis. The synergism and the octane degradation pathway was proposed based on the two main types of reactions. This core-shell Fenton system suggests a promising approach for catalyst and microreactor design in advanced oxidation technologies for refractory VOCs removal.
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CARBON
·
2020
·
IF 8.821
Shuqi Hu,Wenpeng Ni,Daihui Yang,Chao Ma,Jiaheng Zhang,Junfei Duan,Yang Gao,Shiguo Zhang
Atomically dispersed Fe–N–C catalysts with additional Fe-containing nanoparticles including metal, carbides or oxides have shown great potentials towards oxygen reduction reaction (ORR) catalysis. However, the formation of these synergistically active nanoparticles and the effect of the porous carbon structures remain unclear. In this work, a novel single-atom-involved electrochemical catalyst, i.e. , Fe 3 O 4 nanoparticles encapsulated in atomically dispersed Fe–N–C (Fe 3 O 4 @FeNC) was reported. The optimized Fe 3 O 4 @FeNC exhibits excellent ORR activity with a half-wave potential of 0.890 V and a Tafel slope of 58.8 mV dec −1 , comparable with recently reported ORR catalysts and superior to these of commercial Pt/C. More importantly, the porous architectures not only affect the mass transfer and active sites, but casts huge influence on the nucleation of Fe 3 O 4 nanoparticles, the graphitization degree of the carbon support, the chemical environments of the elements, and the ORR catalytic pathways. Density functional theory calculations show stronger O 2 adsorption on Fe–N–C when supported on Fe 3 O 4 moieties, which may increase the reactant concentration for ORR and promote the overall activity. These findings will provide important references for the future understanding and design of single-atom-involved catalysts with enhanced electrochemical properties .
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