NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 36
·16648-16657
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IF 3.591
Jing-Jiang Liu,Zhi-Wei Yan,Rui-Xue Kang,Jin-Hui Wang,Xun Feng
Herein, unique N,O-codoped porous biocarbon (PB) was prepared using Ephedra Herb (EH) as a precursor via a green and sustainable NaCl-sealing strategy and subsequent pyrolysis method. PB possesses vast microstructure, interlinked pores, and high specific surface area, which can facilitate ion adsorption and buffering to improve its properties as an electrode material. In addition, the high specific surface area, well-developed porosity, and abundant heteroatoms in EH are retained well owing to the salt-sealing approach, contributing to additional pseudocapacitance. Therefore, a typical PB sample (S12), obtained from the NaCl-sealing and pyrolysis of the mixture of EH and NaCl at a mass ratio of 1 : 2, is endowed with high specific capacitance, excellent rate performance, and performance retention over long-term cycling. Most importantly, an aqueous symmetrical supercapacitor (S12//S12) assembled with S12 electrodes has a superior specific energy density of 11.6 W h kg−1 at a specific power density of 450.1 W kg−1 in Li2SO4 electrolyte. This work confirms the utility of a NaCl-sealing strategy for designing high specific surface area biocarbon materials that are ultra-rich in micropores, and it sheds some light on the use of sustainable and low-cost synthetic carbon that is ultra-rich in micropores to meet energy-storage device requirements.
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JOURNAL OF CATALYSIS
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2021
·
IF 7.92
Zean Xie,Zhi Li,Peng Tang,Yangyang Song,Zhen Zhao,Lian Kong,Xiaoqiang Fan,Xia Xiao
Recently, the coordinatively unsaturated metal-O Lewis acid-base pairs of metal oxides are found to be able to activate the C–H bond of light alkane efficiently. For the inert crystal Al 2 O 3 , we found that the surface oxygen vacancy amount of Al 2 O 3 can be controlled by pretreatment of CO reduction, and the nearby coordinatively unsaturated Al-O (Al cu -O) pairs can effectively catalyze propane dehydrogenation (PDH). The C 3 H 6 formation rate of γ/δ-Al 2 O 3 is in line with the concentration of oxygen vacancies. The experiments and DFT calculations illuminate the importance of oxygen vacancy on the surface of Al 2 O 3 for PDH reaction. The consumption of lattice oxygen reduces the one coordination number of the bonding Al, the formed Al cu -O as defective acid-base pairs, can be an effective way to tune the adsorption energy of the intermediates and the barriers of key steps (the first C H activation and H 2 formation) to enhance the performance of PDH through both site-dependent concerted and stepwise mechanisms.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 31
·42694-42705
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IF 4.223
Wu Peng,Liu Yiqing,Fu Yongsheng,Zhou Gaofeng,Deng Jiewen
The solubilization laws of pollutants in micelles and their separation efficiency are very important in the successfully efficient application of micellar enhanced ultrafiltration (MEUF). The solubilization behavior of o -toluidine (OT) and tricyclazole (TC) into sodium dodecyl sulfate (SDS) micelles in MEUF was studied using nonlinear equation sets for concentration analysis, which resolved the issue on the overlap of absorption spectra of multicomponent compounds restricting the application of conventional ultraviolet (UV) spectroscopic method. The solubilization isotherms for both pollutants could be best explained by the Langmuir-Freudlich model ( R 2 >0.99) followed by the modes of Langmuir and Freudlich, inferring the complexity of solubilization mechanism and solubilization advantage of monolayer over multilayer. The calculated thermodynamic parameters ( ΔG 0 , ΔH 0 and ΔS 0 ) indicated that this process was endothermic and spontaneous. The solubilization of OT and TC well followed the pseudo second-order and pseudo first-order kinetics, respectively. The separation and recovery of SDS solubilizing these two pollutants were also investigated through lowering solution temperature to 2 °C followed by centrifugation. The best recovery rate of about 66% for SDS was achieved containing 10 and 5% of each initial amount of OT and TC, respectively, at near-neutral solution pH value. The recovery of SDS could decrease to some extent under alkaline and acidic conditions.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Hong Li,Xinzhu Wen,Feng Shao,Shiwei Xu,Chao Zhou,Yafei Zhang,Hao Wei,Nantao Hu
Rational materials design is critical to develop advanced electrodes for high-performance sodium-ion battery. In this work, a well-designed structure with interlayer-expanded molybdenum disulfide (MoS 2 ) vertically anchored on graphene substrates (v-MoS 2 /rGO) is achieved by one-pot hydrothermal synthesis . The vertical anchored MoS 2 and high conductivity graphene sheets provide a good path for electrons/ion transfer. More importantly, the direct linkage of O from functional group on graphene oxide (GO) with edge S of MoS 2 (C-O-S) is constructed, which can maintain the stability of the v-MoS 2 /rGO electrode and enhance its electrons transport rate for the high-rate performance and long cycle life. The assembled sodium-ion battery shows high rate performance (129.2 mAh g −1 at 10 A g −1 ) and long cycling stability (251.2 mAh g ‐1 −1 at 2 A g −1 after 1000 cycles with an ultra-low degradation of 10.9 μAh g −1 per cycle). The excellent performance makes the designed structure a fascinating anode for sodium battery.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Yifan Liu,Yan Luo,Mingliang Li,Lixia Yang
A novel Bi 2 MoO 6 (BMO) modified g-C 3 N 4 heterostructure composite photocatalyst (g-C 3 N 4 /BMO) was prepared by hydrothermal method . The orthorhombic crystal phase of the material was studied by the X-ray diffraction assay (XRD). The microscopic morphology of the material was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), indicating a heterojunction structure of the composite. The electrons and holes separation was evaluated by photo-luminescence (PL) and photocurrent measurements. The removal rate of O-Nitrophenol was as high as 97.3% over the catalyst with the optimal ratio of 1: 0.09 (BMO:g-C 3 N 4 ) in 180 min. COD removal percentage of actual pharmaceutical wastewater was as high as 71.40%. The active species in the photocatalytic system were studied, indicating superoxide radicals ( · O 2 - ) and holes (h + ) as the main active species.
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FOOD HYDROCOLLOIDS
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2021
·
IF 9.147
Cen Zhang,Peng Wang,Jiawen Li,Hui Zhang,Jochen Weiss
Core-shell nanofibers were electrospun from bilayer gelatin/gum arabic corn oil-in-water emulsions crosslinked by genipin. The crosslinking increased the apparent viscosity and induced a predominantly elastic behavior of the emulsions, which favored the formation of a more stable emulsion system and then electrospun fibers with larger diameters. These fibers had improved surface hydrophobic and mechanical properties, and did not thermally decompose until heated to 250 ° C, which might be associated with the chemical bonds formed between primary amines on the protein chains. The encapsulation efficiency of corn oil in the fibers at different crosslinking time was higher than 86% without any significant change during 7 days of storage at room temperature. Thus, this work provides a genipin crosslinking strategy to the development of emulsion-based fibrous mats with desired mechanical and surface hydrophobic properties for food applications of bioactive encapsulation and controlled release.
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JOURNAL OF MOLECULAR LIQUIDS
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2021
·
IF 6.165
Hui Yan,Yanbo Liu,Haoyu Peng,Jiahui Li,Mingyang Chen,Junbo Gong
The solubility of o -methoxybenzoic acid (OMBA) in twelve pure solvents range from 283.15 to 323.15 K was investigated by the experiments and molecular simulations. The result of gravimetric method showed that OMBA has the highest solubility in acetone and the lowest solubility in water. Molecular simulations of MPI, MEPs, HS and SFE were employed to understand the dissolution behavior. In particular, MPI had proved to be an uncommon but effective parameter, which can provide a better explanation based on the polarity of “like dissolves like”. Moreover, the intermolecular interactions derived from HS analysis indicated that the H-H contacts as well as the C=O∙∙∙H-O hydrogen bonding interactions were dominant in the crystal packing of OMBA. Six thermodynamic models were further selected to correlate experimental solubility results successfully as the A R D % values of the six models were less than 7%. The mixing thermodynamic properties obtained from the correlated results of the NRTL model, indicating that the dissolution process is spontaneous and entropy-driven. The experimental data can be used as a useful basis for the industrial production of intermediate product OMBA.
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MACROMOLECULES
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2020
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IF 5.918
Fan Zhang,Tiantian Li,Wanting Chen,Xiaoming Yan,Xuemei Wu,Xiaobin Jiang,Yang Zhang,Xiaozhou Wang,Gaohong He
As critical triggers, both the electron-withdrawing links and neighboring cationic groups induce and accelerate the aryl ether cleavage in the widely used aryl ether containing anion exchange membranes (AEMs). Herein, a novel alkaline stable polyelectrolyte is proposed by converting the electron-withdrawing C═O links in the widely used poly(aryl ether ketone) backbone into the electron-donating C–NH2 links, and then grafting faraway para-type cations by Leuckart-Menshutkin reaction without using noble metal catalysts. Contributions of the elimination of electron-withdrawing C═O links and graft of para-type cations to the excellent alkaline stability of the aryl ether containing polyelectrolytes are demonstrated through density functional theory, as the increasing electron cloud density on the ether-connected carbon atom elevates the activation energy barrier to OH– initiated aryl ether cleavage, and the para-type cation is more stable than the conventional ortho-type cation due to the sterical protection and low electrophilicity to benzylic carbon. By converting C═O to C–NH2 groups and then tuning the quaternization degree, the remaining C–NH2 groups in the polymer backbone could form hydrogen bonding networks to reinforce the membranes. The novel quaternized poly(aryl ether amine) membrane exhibits high conductivity (92.2 mS cm–1 at 80 °C), excellent mechanical properties (48.2 MPa, 51.3%), and suppressed swelling ratio (12.8% at 80 °C). Excellent alkaline stability is also confirmed experimentally with no polymer backbone degradation even in harsh conditions (4 M KOH, 80 °C, 400 h), which is at the top level among the state-of-the-art side chain and aryl ether-free types of AEMs.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Gaobo Lou,Gu Pei,Yitian Wu,Yingzhuo Lu,Yatao Wu,Xinqiang Zhu,Yajun Pang,Zhehong Shen,Qiang Wu,Shenyuan Fu,Hao Chen
Low-cost, high-performance, and long-life cathode materials are highly desired for zinc ion hybrid supercapacitors (ZHSs). Here, an N, O co-doped two-dimensional (2D) carbon nanosheet material is successfully fabricated via a one-step combustion conversion of wood for the excellent usage as the cathode material in zinc-ion hybrid supercapacitors. This novel combustion conversion synthesis with Zn(NO 3 ) 2 ·6H 2 O as oxidizer and urea as fuel can easily achieve the carbonization, pore-forming, and heteroatom doping within a one-step process. More interestingly, the resulting N, O co-doped porous carbon owns relatively uniform 2D sheet structure and very high specific surface area (1248 m 2 g −1 ), which can not only provide short electric/ionic transfer path plus optimized wettability and conductivity for high power output, but also offer abundant interfacial active sites as well as improved ion adsorption capacity for high energy storage. Benefiting from these advantages, the ZHS based on this N, O co-doped 2D carbon nanosheets exhibits a superior specific capacity of 111.0 mAh g −1 at 0.1 A g −1 , high rate capability of 57.6% capacity retention at a 30-fold higher current, and attractive energy density of 109.5 Wh kg −1 at 225 W kg −1 . More gratifyingly, it displays ultralong cycling life with 92.7% capacity reservation after 50,000 charge and discharge cycles. Moreover, a quasi-solid ZHS with N, O co-doped 2D carbon nanosheets coated on the carbon cloth as the cathode also displays satisfactory specific capacity (34.6 mAh g −1 ), impressive energy density (27.7 Wh kg −1 ), and nice flexibility.
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CHEMOSPHERE
·
2020
·
IF 5.778
Juping You,Yingying Deng,Han Chen,Jiexu Ye,Shihan Zhang,Jingkai Zhao
An exoelectrogens, Shewanella oneidensis MR-1 ( S. oneidensis MR-1), was supplied to a microbial fuel cell (MFC) to enhance the degradation of a recalcitrant organic compound, o -xylene. The experimental results revealed that, with the addition of the S. oneidensis MR-1, the o -xylene removal efficiency increased by 35–76% compared with the original MFC. The presence of the S. oneidensis MR-1 not only improved the activity of the biofilm in the bioanode but also developed the connections between the bacteria by nanowires . Therefore, the maximum power density increased from 52.1 to 92.5 mW/m 3 after the addition of the S. oneidensis MR-1. The microbial community analysis showed that adding the S. oneidensis MR-1 increased the biodiversity in bioanode. The dominant exoelectrogens shifted from Zoogloea sp., Delftia sp., Achromobacter sp., Acinetobacter sp., Chryseobacterium sp., and Stenotrophomonas sp. to Zoogloea sp., Delftia sp., Shewanella sp., Achromobacter sp., Hydrogenophaga sp., Sedimentibacter sp. and Chryseobacterium sp.. Furthermore, the cyclic voltammetry analysis showed that the outer membrane bound protein complex of OmcA–MtrCAB was involved as direct electron transfer pathway in the S. oneidensis MR-1 containing bioanode. We believed that this work is promising to provide optional strategy for efficient VOCs degradation by adjusting the microbial community in the bioanode.
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JOURNAL OF MEDICINAL FOOD
·
2020
·Vol. 23
·期 1
·90-99
·
IF 2.04
Yuanruo Gan,Yong Fu,Lipin Yang,Jiangning Chen,Hong Lei,Qin Liu
Anthocyanin-rich extracts have shown anti-inflammation activity in mouse colitis models. Cyanidin-3-glucoside (C3G) is one of the widespread anthocyanins in plants, and cyanidin (Cy) is the aglycone of C3G that can be generated in intestine under gut microorganism metabolism. To explore the anti-inflammatory activity of single anthocyanins compound and show the potential mechanism, the protective effects of C3G and its aglycone Cy on 2,4,6-trinitrobenzenesulfonic acid (TNBS)-induced colitis in mice and lipopolysaccharide (LPS)-stimulated Caco-2 cellular monolayer inflammation were studied. The results showed that both C3G and Cy significantly improved the clinical symptoms and relieved the histological damage in TNBS-challenged mice. The activity of myeloperoxidase and the excretion of inflammatory cytokines tumor necrosis factor-α, interleukin-1β, interleukin-6, and interferon-γ were also significantly inhibited at the administration dosage of 200 μmol/kg. In vitro studies showed that when LPS-stimulated Caco-2 cells were pretreated with C3G and Cy, the destruction of the intestinal epithelial barrier was ameliorated due to the improvement of the transepithelial electrical resistance and Lucifer yellow flux values, while there were no significant difference between C3G and Cy groups at the same dosage. Similarly, both C3G and Cy suppressed nitric oxide production and inflammatory cytokines secretion of LPS-induced Caco-2 cells. C3G and its aglycone Cy had similar anti-inflammatory activity in both colitis mice and Caco-2 cells. The results suggest that C3G and Cy may exert anti-inflammatory effects by protecting the intestinal barrier as well as by suppressing inflammatory cytokine secretion. Thus, C3G or Cy could be potential preventive agents or supplementary medicines for inflammatory bowel disease.
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ACS Applied Energy Materials
·
2020
·
IF 4.473
Yin’an Zhu,Ye Pan,Weiji Dai,Tao Lu
Electrochemical splitting of water to hydrogen is widely considered as an efficient and sustainable solution to relieve the energy crisis. In this work, we report a facile dealloying method based on metallic glass (Ni61Zr36Mo3) to introduce abundant oxygen vacancies (Ov) for the electrocatalytic hydrogen evolution reaction (HER). The corroded ribbons are composed of a sandwich-like structure with Ni–Mo–O nanoporous layer outside and raw metallic glass inside. This complex structure delivers a low overpotential of 71 ± 2.6 mV at −20 mA cm–2geo in 1.0 M KOH solution, a Tafel slope of 57 ± 3 mV dec–1, and 100 h long-term stability for HER, which is much better than those of the crystallized counterpart, nanoporous Ni, and the commercial benchmark 20% Pt/C electrocatalyst. The high concentration of oxygen vacancies (71.5%), the alloying effect of Mo, and amorphous composition synergistically contribute to the superior electrocatalytic ability and enhanced reaction kinetic of nanoporous Ni–Mo–O, indicating it an excellent low-cost alternative for platinum in hydrogen production.
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