ENVIRONMENTAL POLLUTION
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2017
·
IF 5.099
Kun Yang,Yuan Jiang,Jingjing Yang,Daohui Lin
Knowledge of adsorption behavior of organic contaminants on high heat temperature treated biochars is essential for application of biochars as adsorbents in wastewater treatment and soil remediation . In this study, isotherms of 25 aromatic compounds adsorption on biochars pyrolyzed at 700 °C from biomass including wood chips, rice straw, bamboo chips, cellulose, lignin and chitin were investigated to establish correlations between adsorption behavior and physicochemical properties of biochars. Isotherms were well fitted by Polanyi theory-based Dubinin-Ashtakhov (DA) model with three parameters, i.e., adsorption capacity ( Q 0 ) and adsorption affinity ( E and b ). Besides the negative correlation of Q 0 with molecular maximum cross-sectional areas ( σ ) of organic compounds, positive correlations of Q 0 with total pore volume ( V total ) and average diameter of micropore ( D ) of biochars were observed, indicating that adsorption by biochars is captured by the pore-filling mechanism with molecular sieving effect in biochar pores. Linear solvation energy relationships (LSERs) of adsorption affinity ( E ) with solvatochromic parameters of organic compounds (i. e., α m and π ∗ ) were established, suggesting that hydrophobic effect, π-π interaction and hydrogen-bonding interaction are the main forces responsible for adsorption. The regression coefficient ( π 1 ) and intercept ( C ) of obtained LSERs are correlated with biochar H/C and R micro , respectively, implying that biochars with higher aromaticity and more micropores have stronger π-π bonding potential and hydrophobic effect potential with aromatic molecule, respectively. However, hydrogen-bonding potential of biochars for organic molecules is not changed significantly with properties of biochars. A negative correlation of b with biochar H/C is also obtained. These correlations could be used to predict the adsorption behavior of organic compounds on high heat temperature treated biochars from various biomass for the application of biochars as sorbents and for the estimating of environmental risks of organic compounds in the present of biochars.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2016
·Vol. 30
·期 8
·680-683
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IF 2.452
Lulu Wang,Minxin Yang,Xiaochong Liu,He Song,Lu Han,Wenyi Chu,Zhizhong Sun
A bidentate-chelation assistant palladium-catalyzed direct C-H cyanation of picolinamides with TMSCN is described. The reaction of various derivatives gave the corresponding cyanated products in moderate to good yields under mild conditions. In addition, the cyanated product could transform into some valuable functional groups in good yields. Copyright © 2016 John Wiley & Sons, Ltd.
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Nanoscale
·
2017
·Vol. 9
·期 28
·10059-10066
·
IF 7.367
Yan Zhang,Ting He,Guanglei Liu,Lianhai Zu,Jinhu Yang
In this paper, we report the successful design and synthesis of a hierarchically porous MoS2/C composite aerogel by simple one-pot mass preparation. The synthesis involves the in situ formation of MoS2 nanosheets on agarose molecular chains, the gelation of MoS2-deposited agarose monomers to generate a composite hydrogel, and in situ transformation of the composite hydrogel into a MoS2/C composite aerogel through carbonization. This composite aerogel can be used as a high-performance electrode material for supercapacitors and lithium-ion batteries. When tested as a supercapacitor electrode, it achieves a high specific capacitance of 712.6 F g−1 at 1 A g−1 and 97.3% capacity retention after 13 000 cycles at 6 A g−1. In addition, as a lithium-ion battery electrode, it exhibits a superior rate capability (653.2 mA h g−1 at 0.1 A g−1 and 334.5 mA h g−1 at 5.0 A g−1) and an ultrahigh capacity retention of nearly 100% after 1000 cycles at 1 A g−1. These performances may be ascribed to the unique structure of the MoS2/C composite aerogel, such as hierarchical pores, (002) plane-expanded MoS2 and interconnected carbon networks embedded uniformly with MoS2 nanosheets. This work may provide a general and simple approach for mass preparation of composite aerogel materials and pave the way for promising materials applied in both supercapacitors and lithium-ion batteries.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2016
·
IF 3.014
Yonghai Song,Yaqin Chen,Jiafeng Wu,Yuanyuan Fu,Rihui Zhou,Shouhui Chen,Li Wang
In the contemporary era, energy demands are ever-growing and a significant number of people are concerned about environmental pollution caused by the burning of fossil fuels. Therefore, it is a striking problem for the researchers to pursue renewable energy and sustainable energy to deal with the environmental and energy crisis. In this work, a novel hybrid hollow porous ZnO/C nanocages with high specific surface areas of 256 m 2 g −1 and high carbon content in weight of about 50% used as anode materials for lithium ion batteries (LIBs) were synthesized by a one-step pyrolysis of hollow metal organic framework material MOF-5 as both precursor and self-sacrificing template under N 2 atmosphere. The hollow porous ZnO/C nanocages released an initial discharge capacity of 1928 mA h g −1 at the current density of 100 mA g −1 and remained a high reversible capacity of 750 mA h g −1 after 100 cycles. According to the results of electrochemical measurements, the hollow porous ZnO/C nanocages also showed a good rate capability of 351 mA h g −1 at a relative large current density of 2 A g −1 . The excellent electrochemical performance was mainly due to the special nanostructures of the fabricated materials. Hence, the as-resulted hollow porous ZnO/C nanocages are promising anode materials for LIBs.
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JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 24
·期 3
·613-620
·
IF 1.385
Fu Yuanyuan,Zhong Baoying,Chen Yaqin,Song Yonggui,Zhou Rihui,Song Yonghai,Chen Shouhui
A novel porous spherical ZnO@carbon (C) nanocomposite based on zeolitic imidazolate frameworks (ZIFs-8)-directed method was prepared for lithium-ion batteries (LIBs). In this strategy, spherical ZnO nanoparticles were firstly prepared, then 2-methylimidazolate and Zn 2+ were added alternately under ultrasound to fabricate ZnO@ZIF-8. Finally, the novel porous spherical ZnO@C nanocomposites were obtained via pyrolyzing the corresponding ZnO@ZIF-8. The novel porous spherical ZnO@C nanocomposites were characterized with different analysis techniques such as scanning electron microscopy, transmission electron microscopy and X-ray powder diffraction. The resulted spherical ZnO@C nanocomposites exhibited a high reversible capacity of 932 mA h g −1 at 0.1 A g −1 after 100 cycles, which is much higher than that of the pure ZnO nanoparticles. The porous structure, high specific surface area and good electrical conductivity eventually contribute to the good performance of the resulted ZnO@C nanocomposites for LIBs should be ascribed to the proous structure and high BET surface area derived from ZIFs, as well as the good electrical conductivity of the amourphous carbon derived from ZIFs.
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Chemistry-An Asian Journal
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2016
·Vol. 11
·期 24
·3541-3549
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IF 4.592
Xin Zhang,Ruyan Wu,Zeyi Wang,Mingxia Gao,Hongge Pan,Yongfeng Liu
Graphical Boosting hydrogen storage : In situ-synthesized nanocrystalline ZrO 2 @C exhibits good catalytic activity for hydrogen storage in NaAlH 4 . The NaAlH 4 –7 wt % ZrO 2 @C sample releases hydrogen starting from 126 °C and reabsorbs hydrogen starting from 54 °C, and these temperatures are lower by 71 and 36 °C, respectively, than those for pristine NaAlH 4 (see figure). Sodium alanate (NaAlH 4 ) has attracted intense interest as a prototypical high-density hydrogen-storage material. However, poor reversibility and slow kinetics limit its practical applications. Herein, a nanocrystalline ZrO 2 @C catalyst was synthesized by using Uio-66(Zr) as a precursor and furfuryl alcohol (FA) as a carbon source. The as-synthesized ZrO 2 @C exhibits good catalytic activity for the dehydrogenation and hydrogenation of NaAlH 4 . The NaAlH 4 -7 wt % ZrO 2 @C sample released hydrogen starting from 126 °C and reabsorbed it starting from 54 °C, and these temperatures are lower by 71 and 36 °C, respectively, relative to pristine NaAlH 4 . At 160 °C, approximately 5.0 wt % of hydrogen was released from the NaAlH 4 -7 wt % ZrO 2 @C sample within 250 min, and the dehydrogenation product reabsorbed approximately 4.9 wt % within 35 min at 140 °C and 100 bar of hydrogen. The catalytic function of the Zr-based active species is believed to contribute to the significantly reduced operating temperatures and enhanced kinetics.
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高影响因子
COMPOSITES COMMUNICATIONS
·
2016
·
IF 0
Kezhen Lu,Ning Wang,Jianyu Ren,Ning Wu,Xiongyi Huang
Titanium carbonitride (C 1−X N X Ti) possesses excellent physical and chemical properties. However, the studies on processing conditions and the conductivity of the continuous three-dimensional curly C 1−X N X Ti-C nanofibers mat are missing. In this work, the continuous three-dimensional curly C 1−X N X Ti-C nanofibers mat was successfully fabricated by the carbothermal reduction of composite nanofibers by airspinning. This was the economical and efficient method for industrialization. The carbonization was treated at the different low-temperatures, which produced the carbon structure with different crystalline. And the crystallinity of carbon had the effect on the formation of Itanium carbonitride. Single and few-layer graphene grown in the transformation of amorphous carbon , and C 0.7 N 0.3 Ti exhibited the enhanced electrical conductivity and the lower charge transfer resistance. This was attributed to the effect of nitrogen addition, which played a substantial part in increase of the electrochemical performance. This continuous three-dimensional curly C 1−X N X Ti-C nanofibers mat with excellent electrical properties is promising to apply in titanium matrix composites and electronic devices.
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CHEMICAL COMMUNICATIONS
·
2017
·Vol. 53
·期 11
·1805-1808
·
IF 6.319
Jin Han,Guan-Nan Li,Feng Liu,Minqiang Wang,Yan Zhang,Linyu Hu,Chunlong Dai,Maowen Xu
Novel K3V2(PO4)3 and three-dimensional conductive network K3V2(PO4)3/C nanocomposites are successfully fabricated and further evaluated as cathode materials for potassium-ion batteries for the first time. The K3V2(PO4)3/C nanocomposite exhibits a high-potential platform of 3.6–3.9 V and a good capacity retention of at least 100 cycles. This work may provide new insight into developing cathode materials for potassium-ion batteries.
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ADVANCED SYNTHESIS & CATALYSIS
·
2016
·Vol. 358
·期 17
·2759-2766
·
IF 6.453
Zhigang Lv,Jing Liu,Wei Wei,Jie Wu,Wenquan Yu,Junbiao Chang
An intramolecular aryl C−H amination reaction has been achieved using molecular iodine as the sole oxidant for the synthesis of benzimidazole derivatives. The required substrates were readily prepared by addition or coupling of arylamines with the corresponding nitriles or aryl iodides. Iodine-mediated oxidative cyclization of these substrates in the presence of potassium carbonate (K 2 CO 3 ) as base afforded the corresponding products in moderate to good yields. The transition metal-free protocol presented here is insensitive to air and operationally simple. This versatile and eco-friendly synthetic methodology is broadly applicable to a variety of N -aryl-substituted amidines and pyridin-2-amines, and provides direct access to both 1 H -benzo[ d ]imidazole and pyrido[1,2- a ]benzimidazole derivatives from the corresponding precursors.
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CHEMICAL ENGINEERING JOURNAL
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2016
·
IF 5.31
Qianqian Huang,Jiayin Zhang,Zhengyu He,Penghui Shi,Xin Qin,Weifeng Yao
N-doped carbon materials have great potential as functional materials for water pollution control. However, the synthesis of green and sustainable N-doped carbon catalysts face numerous challenges. This study uses a thermal treatment by directly heating a homogeneous mixture of cobalt acetate and dimethylglyoxime to synthesize lamellar ordering Co 3 O 4 /N/C compounds. Dimethylglyoxime was chosen to play duple roles as both nitrogen and carbon source. The obtained N-doped carbon material was used as a catalyst for effective aniline degradation by activating peroxymonosulfate (PMS). In this approach, nanomaterials with good catalytic performance, high stability, and magnetic property can be obtained, which facilitate recycle convenience. In this study, graphitic N is found to improve electron mobility, and the lone pair of pyrrolic-like N electrons tends to form effective Co-N 4 moieties with Co species, which can increase the catalyst activity. Therefore, the prepared catalyst has higher activity than individual Co 3 O 4 . Furthermore, the effects of N-doped carbon materials on aniline degradation by activated PMS and the proposed reaction pathways for the mineralization of aniline were explain in detailed.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Xiao-Chun Deng,Xiao-Dong Kang,Guo-Hua Zhang
The (TiZrHfNbTaMo)C-15 wt.% Co ceramics with excellent comprehensive properties were successfully prepared by vacuum liquid phase sintering. The effects of WC content on the grain size, microstructure, and mechanical properties were investigated. The results showed that WC was dissolved into (TiZrHfNbTaMo)C phase to form a seven-component solid solution, and the independent WC phase disappeared. The addition of WC improved the wettability between the ceramic phase and the metal phase and promoted the densification of the ceramics. In addition, WC played a role in refining grains and inhibiting the grains growth to a certain extent. The comprehensive properties of ceramics were improved by solid solution strengthening and high entropy effect. When the WC content was 5 wt.%, the toughness reached the maximum of 9.41 ± 0.15 MPa·m 1/2 , and the hardness of the ceramic with 10 wt.% WC achieved the highest value of 18.18 ± 0.20 GPa.
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FLAVOUR AND FRAGRANCE JOURNAL
·
2025
·
IF 2
Tanfang Xu,Junfeng Liu,Ping Wang,Junfeng Zan,Ke Yang,Daizhi Tian,Maohua Chen,Yanhua Li
Thymol (THY) is a natural antioxidant and antimicrobial; however, its biological activity and application in the food and pharmaceutical fields are limited due to its low water solubility and volatility. In this study, inclusion complexes of cationic-β-cyclodextrin-THY (C-β-CD-THY) were prepared by using the aqueous stirring method. Then UV–Vis spectra, FT-IR, NMR, DSC, XRD and SEM data were collected to characterise the structure and morphology of the inclusion complexes. Phase solubility experiments showed a better solubilisation effect of C-β-CD-THY than HP-β-CD-THY. At a concentration of 0.64 mmol/L for THY, the DPPH scavenging rate was 60.99% and 61.31% for HP-β-CD-THY and C-β-CD-THY, respectively, whereas that of THY in 10% ethanol was only 43.47%. The bacteriostatic activity was verified using a circle of inhibition and the live/dead bacterial double stain. C-β-CD-THY exhibited better antimicrobial activities against Escherichia coli and Staphylococcus aureus than HP-β-CD-THY. In conclusion, the C-β-CD-THY inclusion complexes have the potential to be applied as an effective bacteriostatic agent for food and pharmaceutical applications.
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