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Extractive distillation of the benzene and acetonitrile mixture using an ionic liquid as the entrainer

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Green Energy & Environment 2021年第3期6卷 444-451页

作者： Yichun Dong Qingchun yang Zhiwei Li Zhigang Lei School of Chemistry and Chemical Engineering Hefei University of TechnologyHefei230009China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBox 266Beijing100029China

The benzene and acetonitrile azeotropic mixture was proposed to be separated by extractive distillation using an ionic liquid(IL)as the entrainer.The suitable IL was selected by the COSMO-RS model,and 1-ethyl-3-methylimidazolium tetrafluoroborate([EMIM][BF_(4)])was considered as the suitable entrainer mainly due to its high selectivity,low viscosity,and low price.The experimental vapor pressure data of the IL-containing systems(benzene+[EMIM][BF_(4)]and acetonitrile+[EMIM][BF_(4)])were measured in the full concentration range.The results show that acetonitrile has a stronger interaction with IL than benzene,and the low deviations between the experimental and UNIFAC predicted values show the reliability of the UNFIAC model.The UNIFAC predicted vapor-liquid equilibrium data of the benzene+acetonitrile+dimethyl sulfoxide(DMSO)/[EMIM][BF_(4)]system show that the relative volatility of benzene to acetonitrile is higher when the entrainer is[EMIM][BF_(4)].The process simulation results show that[EMIM][BF_(4)]can reduce the material and energy consumptions compared with DMSO.

关键词： Benzene Acetonitrile Extractive distillation Ionic liquid UNIFAC model

Technical and economic analysis of an oil shale comprehensive utilization process with solid heat carrier technology

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Carbon Resources Conversion 2018年第3期1卷 266-272页

作者： Qingchun yang Xufang Li Yu Qian Dawei Zhang School of Chemistry and Chemical Engineering Hefei University of TechnologyHefei 230009PR China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640PR China

To relieve the shortage of oil,exploration of oil shale attracts increasingly attention from different countries,especially in China.Facing with the disadvantages of conventional oil shale retorting technology,more and more attention has been paid to the comprehensive utilization of oil shale for utilizing oil shale efficiently and in an environment-friendly manner.However,there are few systematic studies on comprehensive utilization of oil shale.Thus,this paper is focused on establishing the complete mathematical model of an oil shale comprehensive utilization process with solid heat carrier technology(OSCU-SHC).Moreover,its techno-economic performance is analyzed and compared to a conventional oil shale retorting process with solid heat carrier(OSRSHC).Several key parameters are investigated and optimized during the simulation process.For example,the optimal retorting temperature is set to 500℃.The comparison results show that the OSCU-SHC process has better techno-economic performance since it increases the exergy efficiency by 9.26%,total income by 29.02%,and return on investment by 4.85%.

关键词： Oil shale Retorting Comprehensive utilization Process modeling Techno-economic analysis

Boosting the Activity and Stability with Dual-Metal-N Couplings for Li–O_(2)Battery

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Energy & Environmental Materials 2022年第3期5卷 918-927页

作者： Shan Wu Di Wu Dawei Zhang Wenhong Liu Hao Luo Jianbo He Qingchun yang Zhiwei Li Ruiping Liu School of Chemistry and Chemical Engineering Hefei University of TechnologyHeifei Anhui 230009China Department of Materials Science and Engineering China University of Mining and Technology-Beijing CampusBeijing 100083China

Electrocatalysts with high efficiency are crucial for improving the storage capacity and electrochemical stability of lithium–oxygen batteries(LOBs).In this work,through a facile hydrothermal method,cobalt–nitrogen-doped carbon nanocubes(Co–N/C),the calcination products of zeolitic imidazolate framework(ZIF–67)are encapsulated by ultrathin C–MoS_(2) nanosheets to obtain Co–N/C@C–MoS_(2) composites which are used as host materials for the oxygen cathode.The synergistic effect between Co–N_(x) active sites and Mo–N coupling centers effectively promotes the formation and decomposition of Li_(2)O_(2) during repeated discharge and charge process.The mesoporous C–MoS_(2) nanosheets with delicately designed morphology facilitate charge transfer and account for improved reaction kinetics and more importantly,suppressed side reactions between the carbon materials and the electrolyte.The oxygen cathode with the Co–N/C@C–MoS_(2)host shows a high initial discharge specific capacity of 21197 mAh g^(-1)and a long operation life of 332 cycles.Theoretical calculation provides in-depth explanation for the reaction mechanism and offers insights for the rational design of electrocatalysts for LOBs.

关键词： carbon-based electrocatalyst cobalt and nitrogen doping electrochemical stability Li–O_(2)batteries molybdenum disulfide

Iridic oxide nanoparticles grown in situ on BCN nanotubes as highly efficient dual electrocatalyst for rechargeable lithium-O2 batteries

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Journal of Energy Chemistry 2020年第10期29卷 291-298页

作者： Xufang Li Yajun Zhao Jing Zhang Chaoxiong Li Shan Wu Qiufan Shi Dawei Zhang Qingchun yang School of Chemistry and Chemical Engineering Hefei University of TechnologyHefei 230009AnhuiChina Anhui Province Key Laboratory of Power Battery Tianneng Battery Group(Anhui Company)Jieshou 236500AnhuiChina School of Materials Science and Technology Hefei University of TechnologyHefei 230009AnhuiChina

Oxygen cathode catalysts can significantly address the issues faced by Li-O2 battery.In this research,a composite of IrO2 nanoparticles grown in situ on BCN nanotubes(IrO2@BCNNTs)has been synthesized by facile hydrothermal method,which is initially fabricated as cathode catalyst for Li-O2 battery.The results indicate that IrO2@BCNNTs nanocomposite has a better effect on improving the actual discharge capacity,voltage gap and cyclability of Li-O2 battery.In addition,it is also demonstrated that the Ir O2@BCNNTs composite exhibits bifunctional characteristics for both the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)through rotating disk electrode(RDE)measurements.The excellent performances of the synthesized catalyst may be attributed to the unique interconnected tubular structure and strong synergistic effect,which can provide more charged sites and defect sites and then facilitate reversible Li2 O2 formation and decomposition.Therefore,it is promising for applying the rational design of the bifunctional catalyst to Li-O2 battery.

关键词： BCN nanotubes IrO2@BCNNTs composite Rechargeable Li-O2 batteries

Fabrication of magnetically responsive anti-fouling and easy-cleaning nanofiber membrane and its application for efficient oil-water emulsion separation

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Chinese Journal of Chemical Engineering 2022年第1期35卷 286-293页

作者： Yajie Wang Zhiwei Guo Yujie yang Yanxiang Li qingchun Guo Peilin Cui Wangliang Li CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Hebei Lansheng Biotech Co. LtdShijiazhuang 052200China International Medical Service Beijing Tiantan Hospital Affiliated to Capital Medical UniversityChina

The magnetically responsive anti-fouling nanofiber membrane(MRANM)was fabricated for efficient oilwater emulsion separation,which could be cleaned using oscillating magnetic field.MRANM was prepared by grafting superparamagnetic Fe_(3)O_(4) nanoparticles onto the surface of electrospun polyacrylonitrile nanofiber membrane(PANM).Compared with PANM,the water contact angle of MRANM decreased from 104°to 0°,indicating that the hydrophilicity of the membrane was significantly improved.For the emulsions of hexadecane,octane and rapeseed oil,the separation efficiency was 98.04%,96.59%and 92.67%,respectively.After the treatments in oscillating magnetic field,the separation efficiency kept above 95%after 8 times recycling,which indicated that the MRANM had good regenerability and reusability.The as-fabricated membrane with magnetic responsiveness facilitated an effective method for solving the membrane fouling problem during practical applications of separation high viscosity oil-water emulsion.

关键词： Superparamagnetic Nanofiber membrane Anti-fouling Oil-water emulsion Regeneration

Perovskite oxides La_(0.4)Sr_(0.6)Co_xMn_(1-x)O_3(x=0,0.2,0.4) as an effective electrocatalyst for lithium-air batteries

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Green Energy & Environment 2018年第1期3卷 78-85页

作者： Yajun Zhao Tao Liu Qiufan Shi Qingchun yang Chunxiao Li Dawei Zhang Chaofeng Zhang School of Chemistry and Chemical Engineering Hefei University of Technology

Co-doped perovskite oxide La_(0.4)Sr_(0.6)Co_xMn_(1-x)O_3(x=0, 0.2, 0.4) composites are prepared by sol-gel method utilizing citric acid as chelating agent. These composites show good catalytic activities when tested as catalysts rechargeable lithium-air batteries. In particular, the La_(0.4)Sr_(0.6)Co_(0.4)Mn_(0.6)O_3 shows a lower potential gap. When these samples are tested as catalysts for Li-air batteries at a current density of100 mA g^(-1), the discharge capacities with different La_(0.4)Sr_(0.6)Co_xMn_(1-x)O_3(x=0,0.2, 0.4) catalysts are 5819, 6420, and 7227 mA h g^(-1),respectively. In addition, under a capacity limitation of 1000 mA h g^(-1), the cell using La_(0.4)Sr_(0.6)Co_(0.4)Mn_(0.6)O_3 as catalyst shows good cycling stability up to 46 cycles. The good electrochemical performance suggests that suitable doping of Co in Mn site of La_(0.4)Sr_(0.6)MnO_3 could be a promising route to improve the catalytic activity.

关键词： ORR OER Perovskite Lithium-air batteries

A warmer but drier Marine Isotope Stage 11 during the past 650 ka as revealed by the thickest loess on the western Chinese Loess Plateau

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Journal of Arid Land 2016年第3期8卷 315-330页

作者： SHI Peihong yang Taibao TIAN qingchun LI Chengxiu College of Tourism and Environment Shaanxi Normal University Xi'an 710119 China State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China Institute of Glaciology and Ecogeography College of Earth and Environmental Sciences Lanzhou University Lanzhou 730000 China College of Geographical Science Shanxi Normal University Linfen 041000 China Remote Sensing Laboratories Department of Geography University of Zurich-Irchel Winterthurerstrasse 190 CH-8057 Zurich Switzerland

Marine Isotope Stage 11（MIS 11; ca. 423-362 ka） is generally considered to be the best analogue for the present interglacial（Holocene）, and investigation of it will improve our understanding of current climate variability and assist in predictions of future climate change. However, many recent studies primarily focus on the structure and duration of MIS 11. Little research has focused on climate warmth and stability recorded in the Chinese loess-paleosol sequences（LPS） during the S4 paleosol formation（equivalent to MIS 11）. On the basis of previous work, this study presents a high-resolution record（ca. 75 a/cm） that spans from MIS 1 to MIS 15, as preserved in the thickest known Jingyuan loess section on the western Chinese Loess Plateau（CLP）. This LPS is almost 165 m thick and was sampled from the upper part of L6 to the modern soil at 2-cm depth intervals. Measurements of magnetic susceptibility, mean grain size and ＆gt;63 μm particle content, carbonate content, total organic carbon, and soil color of samples were made to reconstruct the paleoclimate variation, and a grain-size age model was used to constrain the chronological framework. The primary results show that a generally warm-humid climate dominated the S4 paleosol development, but the climate condition was extremely unstable during the whole of MIS 11. Two obviously different climate regimes controlled the MIS 11 climate variation： the early part of MIS 11 was extremely warm and stable, but the latter part was relatively cool（non-glacial） and unstable. This climate pattern was consistent with records on the central CLP and wavelet analysis suggested that it was forced by the 65°N insolation variability modulated by a quasi-100-ka cycle. In addition, a multi-proxy comparative study on the climate conditions during S0 to S5 paleosol development indicates that the period of S4 development might be the warmest interglacial of the past 650 ka. However, the climate condition during S4 development was not the most humid episode as recorded in Xifeng and Luochu

关键词： Marine Isotope Stage 11 loess-paleosol interglacial Holocene paleoclimate wavelet analysis

Thermal behavior of an isolator with mode transition inducing back-pressure of a dual-mode scramjet

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Chinese Journal of Aeronautics 2017年第2期30卷 595-601页

作者： yang qingchun Bao Wen Chetehouna Khaled Zhang Silong Gascoin Nicolas School of Astronautics Beihang University 100083 China School of Energy Science and Engineering Harbin Institute of Technology 150001 Harbin China INSA Centre Val de Loir 88 Boulevard Lahitolle 18000 Bourges France

Combustion mode transition is a valuable and challenging research area in dual-mode scramjet engines.The thermal behavior of an isolator with mode transition inducing backpressure is investigated by direct-connect dual-mode scramjet experiments and theoretical analysis.Combustion experiments are conducted under the incoming airflow conditions of total temperature1270 K and Mach 2.A small increment of the fuel equivalence ratio is scheduled to trigger mode transition.Correspondingly,the variation of the coolant flow rate is very small.Based on the measured wall pressures,the heat-transfer model can quantify the thermal state variation of the engine with active cooling.Compared with the combustor,mode transition has a greater effect on the isolator thermal behavior,and it significantly changes the isolator heat-flux and wall temperature.To further study the isolator thermal behavior from flight Mach 4 to Mach 7,a theoretical analysis is carried out.Around the critical point of combustion mode transition,sudden changes of the isolator flowfield and thermal state are discussed.

关键词： Combustion mode Dual-mode scramjet Isolator Mode transition Thermal behavior

Natural products as LSD1 inhibitors for cancer therapy

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Acta Pharmaceutica Sinica B 2021年第3期11卷 621-631页

作者： Yuan Fang Chao yang Zhiqiang Yu Xiaochuan Li qingchun Mu Guochao Liao Bin Yu Joint Laboratory for Translational Cancer Research of Chinese Medicine of the Ministry of Education of the People’s Republic of China International Institute for Translational Chinese MedicineGuangzhou University of Chinese MedicineGuangzhou 510006China Institute of Innovation&Application Zhejiang Ocean UniversityZhoushcm 316022China School of Pharmaceutical Sciences Southern Medical UniversityGuangzhou 510515China The People’s Hospital of Gaozhou Gaozhou 525200China School of Pharmaceutical Sciences Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Natural Medicines China Pharmaceutical UniversityNanjing 210009China

Natural products generally fall into the biologically relevant chemical space and always possess novel biological activities, thus making them a rich source of lead compounds for new drug discovery. With the recent technological advances, natural product-based drug discovery is now reaching a new era. Natural products have also shown promise in epigenetic drug discovery, some of them have advanced into clinical trials or are presently being used in clinic. The histone lysine specific demethylase1(LSD1), an important class of histone demethylases, has fundamental roles in the development of various pathological conditions. Targeting LSD1 has been recognized as a promising therapeutic option for cancer treatment. Notably, some natural products with different chemotypes including protoberberine alkaloids, flavones, polyphenols, and cyclic peptides have shown effectiveness against LSD1. These natural products provide novel scaffolds for developing new LSD1 inhibitors. In this review, we mainly discuss the identification of natural LSD1 inhibitors, analysis of the co-crystal structures of LSD1/natural product complex, antitumor activity and their modes of action. We also briefly discuss the challenges faced in this field. We believe this review will provide a landscape of natural LSD1 inhibitors.

关键词： Epigenetic regulation Histone demethylase Natural products LSD1 inhibitors Drug discovery Cancer therapy