ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Qihua Lin,Yingying Yang,Shusheng Zhang,Faqian Sun,Chaofeng Shen,Xiaomei Su
The investigation into viable but non-culturable (VBNC) bacteria through the implementation of resuscitation promoting factors (Rpfs) has broadened the potential sources for isolating strains capable of degrading polychlorinated biphenyls (PCBs). Nonetheless, there has been limited research on the efficacy of resuscitated strains and the potential improvement of their performance through co-cultivation. In this work, the PCB degradation potential of resuscitated strains, specifically Pseudomonas sp. HR1 and Achromobacter sp. HR2, as well as their co-cultures, was investigated. Of particular importance was the comparative analysis between the optimal co-culture and individual strains regarding their ability to degrade PCB homologs and mineralize intermediate metabolites. The results suggested that the resuscitated strains HR1 and HR2 demonstrated robust growth and effective degradation of Aroclor 1242. The co-culture CO13, with an optimal HR1 to HR2 ratio of 1:3, exhibited a remarkable improvement in PCB degradation and intermediate metabolite mineralization compared to individual strains. Analysis of functional genes and degradation metabolites revealed that both the individual strains and co-culture CO13 degraded PCBs via the HOPDA-benzoate pathway, then mineralized through protocatechuate meta - and ortho -cleavage pathways, as well as the catechol ortho -cleavage pathway. This study represents the first documentation of the improved PCB degradation through the co-cultivation of resuscitated strains, which highlights the great promise of these resuscitated strains and their co-cultures as effective bio-inoculants for enhanced bioremediation.
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Chao Chen,Anqi Wei,Yanhong Li,Kechao Zhou,Dou Zhang
Ba 0.8 Sr 0.2 TiO 3 thin films with different concentrations of Co dopant (0–10 mol%) were deposited on Pt/Ti/SiO 2 /Si substrates by sol-gel method. The microstructure, surface morphology , dielectric and tunable properties of the films were investigated as a function of Co concentration. It was demonstrated that all the Co doped Ba 0.8 Sr 0.2 TiO 3 (BSTC) thin films exhibited dense microstructure with uniform crystal grains and the grain size of the BSTC films decreased with the increase of Co content. Both dielectric constant and loss decreased with the increase of Co dopant. It was proposed that the depressed dielectric loss in BSTC film originated from the reduction of intrinsic electrons by Co acceptor doping . Although tunability of the BSTC films was also reduced with the addition of Co dopant, a largest figure of merit of 4.5 was obtained in the BSTC film with 5 mol% Co dopant owing to the comparable tunability and low dielectric loss of the films, which made it an alternative source for potential tunable applications.
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DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Zixiang Hao,Yang Chen,Linrui Wang,Yuxuan Lu,Chengli He,Mingyan Wang,Xiaoli Cui
Elemental engineering has been employed to adjust molecular framework and electronic configuration of γ-graphyne for rapid lithium storage. Here, we construct a quasi-pyridinic nitrogen/sulfur co-doped γ-graphyne (N/S-GY) via a mechanochemical strategy and reveal its lithium storage behavior by quantitative kinetics analysis and theoretical calculations. The internal pyridinic-N atoms create rhombic channels for Li + passing through, while sulfur dopants anchored with alkynyl groups induce electron cloud rearrangement to facilitate intralayer Li + diffuse between C 12 -triangular channels and interlayer transfer through open rhombic channels. As a result, the as-prepared N/S-GY exhibits a high reversible capacity of 1003 mAh g −1 at 50 mA g −1 after 150 cycles, with Li + diffusion coefficient up to 2.6 × 10 −12 cm 2 s −1 , both of which are larger than that of N-doped γ-graphyne. This work highlights synergistic effect of sulfur and nitrogen co-doping in alkynyl carbon and inspires bottom-up heteroatom modification in framework design.
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DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 14
·6856-6862
·
IF 7.79
Fan Yang,Chunzheng Wu,Hongbo Yu,Shiwei Wang,Tong Li,Bo Yan,Hongfeng Yin
Nanosized Au catalysts suffer from serious sintering problems during synthesis or catalytic reactions at high temperatures. In this work, we integrate dumbbell-shaped Au–Fe3O4 heterostructures into hollow ZrO2 nanocages to make Au–Fe2O3@ZrO2 yolk–shell nanoreactors with high activity as well as ultra-high sintering resistance for high-temperature CO oxidation. The synthesis starts with the fabrication of a (Au–Fe3O4)@SiO2@ZrO2 core–shell nanostructure with a Au–Fe3O4 dumbbell nanoparticle (DB) core and SiO2/ZrO2 double shells, followed by calcination and the selective removal of the inner SiO2 shell with alkaline solution to obtain Au–Fe2O3@ZrO2 nanoreactors. The retained ZrO2 hollow (outer) shells protect the Au NPs from aggregation at temperatures up to 900 °C and show excellent long-term stability. Compared to Au@ZrO2 yolk–shell nanoreactors, Au–Fe2O3@ZrO2 shows improved activity in CO oxidation due to the active Au–Fe2O3 interface. This strategy can be extended to other yolk–shell nanoreactors with various nanocomposites and for different catalytic reactions.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 10
·1-12
·
IF 2.8
Ni Hanwen,Zhang Faqiang,He Zichen,Liu Zhifu
The CaTiSiO 5 -based ceramics show promise as dielectric materials for high-temperature MLCC due to their excellent temperature stability which is expected to be improved by co-doping at the A/B sites. In this study, the Dy and Al co-doped CaTiSiO 5 ceramics (Ca 1− x Dy x Ti 1− x Al x SiO 5 , x = 0, 0.005, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08) were fabricated by the conventional solid-state method. The effects of Dy and Al co-doping on the phase structures, dielectric properties and impedance characteristics, were investigated in detail. CaTiSiO 5 -based ceramics transformed to the paraelectric phase and achieved excellent temperature stability of permittivity by Dy and Al doping, which results from the long-range disorder in the arrangement of Ti displacements within the octahedral chain. Components with x = 0.01 showed linear dielectric response under the electric field. It obtained a high and stable dielectric constant in a wide temperature range ( ε r = 52, TCC ≤ ± 180 ppm/°C over the temperature range from − 55 to 300 °C), low loss (tan δ < 0.07), high breakdown strength (∼ 516 kV/cm) and high DC resistance ( ρ = 3.8 × 10 10 Ω cm at 300 °C).
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DOI
高影响因子
Journal of Advanced Ceramics
·
2020
·Vol. 9
·期 6
·674-682
·
IF 2.889
Liu Ziyu,Toci Guido,Pirri Angela,Patrizi Barbara,Feng Yagang,Wei Jiabei,Wu Feng,Yang Zhaoxiang,Vannini Matteo,Li Jiang
The Yb:Lu 2 O 3 precursor made up of spherical particles was synthesized through the co-precipitation method in the water/ethanol solvent. The 5 at% Yb:Lu 2 O 3 powder is in the cubic phase after calcination at 1100 °C for 4 h. The powder also consists of spherical nanoparticles with the average particle and grain sizes of 96 and 49 nm, respectively. The average grain size of the pre-sintered ceramic sample is 526 nm and that of the sample by hot isostatic pressing grows to 612 nm. The 1.0 mm-thick sample has an in-line transmittance of 81.6% (theoretical value of 82.2%) at 1100 nm. The largest absorption cross-section at 976 nm is 0.96×10 −20 cm 2 with the emission cross-section at 1033 nm of 0.92×10 −20 cm 2 and the gain cross sections are calculated with the smallest population inversion parameter β of 0.059. The highest slope efficiency of 68.7% with the optical efficiency of 65.1% is obtained at 1033.3 nm in quasi-continuous wave (QCW) pumping. In the case of continuous wave (CW) pumping, the highest slope efficiency is 61.0% with the optical efficiency of 54.1%. The obtained laser performance indicates that Yb:Lu 2 O 3 ceramics have excellent resistance to thermal load stresses, which shows great potential in high-power solid-state laser applications.
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DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Yifei Li,Zhongzhu Qiu,Meng Qu,Yuedi Wang,Haodong Wang,Junjie Jiang
Supercapacitors have the advantages of high power density, rapid charge and discharge rates, and extended cycling stability. However, their energy density and specific capacity are still inadequate to satisfy the current requirements for energy storage in the industry. The current work demonstrates the synthesis of Mo-ZIF-67/CNT composites through mechanical stirring and co-precipitation. After that, Ni, Co and Mo trimetallic sulfide/CNT composites (Ni-Co-Mo-S/CNT) are produced through further ion exchange/etching and vulcanization processes . The material has multiple valence states of three different metal ions, providing a large number of oxidation-reduction sites. The doping of CNT endows it with a unique coral-like structure, which helps to form its huge specific surface area and larger mesopores. Furthermore, the effect of vulcanization temperature on the electrochemical performance of the material is also studied. According to the results, the Ni-Co-Mo-S/CNT-180, which is vulcanized at 180 °C, exhibits the most outstanding electrochemical performance. The electrode exhibits impressive performance with a specific capacitance of 1728.6 F/g at a current density of 1 A/g. It also has good rate capability, maintaining 55.8 % of the specific capacitance when the current density increases tenfold. Finally, the prepared Ni-Co-Mo-S/CNT-180//AC asymmetric supercapacitor generated a high energy density of 43 Wh/kg at a power density of 735 W/kg. After 2000 charge-discharge cycles at a current density of 1 A/g, it maintains a capacity of 76.42 %. This study serves as a reference for researching multi-metal sulfides as electrode materials for high-performance supercapacitors.
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2018
·
IF 3.649
Fan Xie,Zhuoying Xie,Panmiao Liu,Yi Yuan,Juan Li,Shan Chen,Fanglei Guo,Jialun Chen,Zhongze Gu
Organic functionalization of periodic mesoporous silicas (PMSs) is an imperative and effective measure to advance their preeminent properties and widespread application due to their structural superiority. In this study, we reported a novel synthesis of organic functionalized PMSs by co-condensing (R’O) 3 Si-H and (R’O) 3 Si-R type terminal trialkoxyorganosilanes based on periodic mesoporous hydridosilica, which is stable but pore walls are comprised of a three-connected three-dimensional network. The synthesis extended the “co-condensation” strategy and broke the incorporation limitation of organic groups by HSiO 3 units in the framework to form hydrogen bonds , which provided a more effective way to obtain PMSs with high degree of organic functionalization.
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DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2017
·
IF 2.429
Yanran XUN,Xinxin HE,Han YAN,Ziwang GAO,Zhao JIN,Chunjiang JIA
In this paper, a series of Fe- and Co-doped lanthanum (hydr)oxides catalysts were prepared by a simple coprecipitation-hydrothermal method. The as-prepared catalysts were characterized with various techniques including powder X-ray diffraction (XRD), N 2 adsorption/desorption, inductively coupled plasma (ICP) and transmission electron microscopy (TEM). The Fe-based catalysts exhibited consecutive phase changes of amorphous FeO x →FeLaO 3 →Fe 2 N under different stages (as-prepared→calcination→ammonia decomposition reaction); as for Co-based catalysts, the phase transformation followed a sequence of Co(OH) 2 → Co 3 O 4 →metallic Co. It was revealed that Fe 2 N and metallic Co were most probably the active crystalline phase respectively for Fe- and Co-based catalysts in the decomposition of ammonia.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zhurong Mo,Shaoshan Su,Yanping Huo,Hongli Wen,Andrzej Suchocki,Deshmukh Abdul Hakeem
Fundamental understanding of the Stokes and anti-Stokes emissions in luminescence materials and their mechanism is very important for different technological applications. In this article, we report the dual mode, down/upconversion (DC/UC), luminescence in a LiAlSi 2 O 6 (β-spodumene) single host along with its mechanistic investigations. A series of emission tunable Li 1- x AlSi 2 O 6 : x Er 3+ (LAS: x Er 3+ ; 0 ≤ x ≤ 0.07) and Li 0.99- y AlSi 2 O 6 :0.01Er 3+ , y Yb 3+ (LAS:0.01Er 3+ ,yYb 3+ ; 0.001 ≤ y ≤ 0.007) phosphor powders were prepared by solid state reaction method at 1300 °C. The formation of single-phase phosphors is verified by XRD technique and other structural properties are investigated by FT-IR, UV-Vis-NIR spectra. The phosphors produced NIR DC emission at 1535 nm (under 380 and 980 nm excitation) and an intense red UC emission at 655 nm (under both 980 and 808 nm excitations). The dual mode emission intensity of the LAS:0.01Er 3+ is further improved by co-doping Yb 3+ ions via energy transfer from Yb 3+ to Er 3+ . The red UC emission intensity of LAS:0.01Er 3+ ,0.005Yb 3+ phosphor under 980 nm excitation is ~10 times stronger than the singly doped LAS:0.01Er 3+ phosphor. In addition, the phosphors can also be efficiently excited by 808 nm laser and hence can be used for biological application since 808 nm NIR irradiation exhibits higher light penetration depth without inducing overheating. The mechanism of energy transfer from Yb 3+ to Er 3+ by considering different emission pathways viz: ground state absorption (GSA), excited state absorption (ESA), energy transfer upconversion (ETU), back energy transfer (BET) and cross relaxation (CR) are discussed in detail. Based on the dual mode emissions, the LAS: x Er 3+ and LAS: x Er 3+ , y Yb 3+ ( x = 0.1 and 0.001 ≤ y ≤ 0.007) phosphors could be a potential candidate not only for the biological application as bio-probe but also as energy convertors for solid-state lighting, displays, and solar cell applications.
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DOI
高影响因子
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2021
·
IF 3.981
Guanglan Ma,Xiao Du,Jianping Zhu,Feng Xu,Hua Yu,Juan Li
Liver cancer is one of the leading causes of cancer mortality worldwide. In this study, poly(lactide) (PLA) and hyaluronic acid (HA) co-modified half-generation of PAMAM G4.5 dendrimers (sPA) was chosen as the intelligent carrier for co-delivery of paclitaxel (PTX) and sorafenib (SOR) to treat liver cancer. The multifunctional micelle (HA-PALA@PTX + SOR) possessed a uniform size of 152.6 nm, good stability against serum medium, and a rapid in vitro drug release behavior under acidic condition in the presence of HAase. Cellular uptake study demonstrated an efficient intracellular delivery and drug accumulation in HepG2 cells. The antitumor and anti-metastasis efficacy of functionalized micelle was more obvious than that of free drugs. These data provided strong evidence that HA-PALA@PTX + SOR micelle could be utilized as a biocompatible and tumor targeted nano-carrier for the delivery of multiple anticancer drugs in liver cancer treatment.
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DOI
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
H. Yu,Z. Wang,W. Tian,Z. Dai,Y. Xu,X. Li,L. Wang,H. Wang
Electrochemical nitrogen reduction reaction (NRR) has been regarded as one of the most promising alternative strategies for nitrogen fixation, and the design of efficient NRR catalysts is the critical factor. Herein, boron and sulfur co-doped mesoporous Rh film on Ni foam (B, S-mRh/NF) is developed for electrochemical ammonia synthesis. The boron and sulfur co-doping, the B, S-mRh/NF, can inhibit competitive hydrogen evolution reaction effectively. Owing to binder-free mesoporous structures, binder-free characteristic, and multicomponent alloy, the B, S-mRh/NF displays a high NH 3 yield of 11.88 μg/h/cm 2 at −0.1 V and Faraday efficiency of 38.42% at −0.05 V in neutral electrolyte. This work offers an effective strategy for the rational design of nonmetal-doped porous Rh electrocatalysts with self-supported structure, which would be highly potential for the electrochemical ammonia synthesis.
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DOI
高影响因子
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