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Effects of Dual Incorporation of Nano-SiO_(2)and Nano-CaCO_(3)on the Abrasion Resistance and Microstructure of Concrete

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Journal of Wuhan University of technology(Materials Science) 2025年第2期40卷 509-518页

作者： SU Jun YANG Haixin WANG Songbo TIAN Jing CAI Xinhua SHUI Farun HUANG Fu XU Ziyang ZENG Qingdian FAN Zikang School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan 430068China Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes Ministry of EducationHubei University of TechnologyWuhan 430068China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China

Seven sets of concrete containing different mass ratios of nano-SiO_(2)(0%-5.0%)and nano-CaCO_(3)(0%-1.5%)were designed.A total of 28 concrete cube specimens cured for 7 and 28 days were tested for compressive strength(14 specimens)and split tensile strength(14 specimens),while 7 cylindrical specimens cured for 28 days were tested for impact *** impact resistance of the concrete specimens was quantitatively analyzed by using impact strength(f_(a))and wear rate(L_^(a)),and the effect of dual incorporation of nano-SiO_(2)and nano-CaCO_(3)on the microstructure of concrete was further investigated by XRD and *** experimental results indicate that the incorporation of 5.0%nano-SiO_(2)and 1.5%nano-CaCO_(3)improves the mechanical properties and impact resistance of concrete most significantly,and the compressive strength,split tensile strength,and impact resistance increase by around 37.80%,35.31%,and 183.36%,respectively,compared with that of ordinary *** the microscopic level,nano-SiO_(2)reacts with C-H in a secondary hydration reaction to increase the number of C-S-H gels,which improves the pore structure in the matrix and favorably enhances the adhesion between aggregate and cement paste in the weakened layer,thus improving the abrasion resistance of concrete.

关键词： nano-SiO_(2) nano-CaCO_(3) mechanical properties abrasion resistance microstructure of concrete

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Amine-functionalized hierarchically porous carbon supported Pd nanocatalysts for highly efficient H2 generation from formic acid with fast-diffusion channels

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Journal of Energy Chemistry 2023年第1期76卷 249-258,I0007页

作者： Xianzhao Shao Xinyi Miao Fengwu Tian Miaomiao Bai Xiaosha Guo Wei Wang Zuoping Zhao Xiaohui Ji Miyi Li Fangan Deng Shaanxi Key Laboratory of Catalysis School of Chemistry and Environment ScienceShanxi University of TechnologyHanzhong 723001ShaanxiChina School of Mathematics and Computer Science Shanxi University of TechnologyHanzhong 723001ShaanxiChina State Key Laboratory of Qinba Bio-Resource and Ecological Environment Shaanxi University of TechnologyHanzhong 723001ShaanxiChina School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing 102488China

Formic acid(FA)has come to be considered a potential candidate for hydrogen storage,and the development of efficient catalysts for H2releasing is crucial for realizing the sustainable process from ***,we have developed the ultrafine Pd nanoparticle(NPs)with amine-functionalized carbon as a support,which was found to show an excellent catalytic activity in H_(2)generation from FA *** synergetic mechanism between amine-group and Pd active site was demonstrated to facilitate H2generation byβ-hydride ***,the texture of support for Pd NPs also plays an important role in determining the reactivity of FA,since the diffusion of gaseous products makes the kinetics of diffusion as a challenge in this high performance Pd *** a result,the as-prepared Pd/NH_(2)-TPC catalyst with the small sized Pd nanoparticles and the hierarchically porous structures shows a turnover of frequency(TOF)value of 4312 h^(-1)for the additive-free FA dehydrogenation at room temperature,which is comparable to the most promising heterogeneous *** results demonstrated that the intrinsic catalytic activities of active site as well as the porous structure of support are both important factors in determining catalytic performances in H2generation from FA dehydrogenation,which is also helpful to develop high-activity catalysts for other advanced gas-liquid-solid reactions systems.

关键词： Hierarchically carbon Diffusion Formic acid Hydrogen production Palladium nanoparticles

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Pt-surface oxygen vacancies coupling accelerated photo-charge extraction and activated hydrogen evolution

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Nano Research 2023年第4期16卷 4736-4741页

作者： Fangxu Dai Mingming Zhang Mingzhong Mi Zhenjiang Li Jun Xing Lei Wang Key Laboratory of Eco-chemical Engineering Ministry of EducationCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China College of Environment and Safety Engineering Qingdao University of Science and TechnologyShandong Engineering Research Center for Marine Environment Corrosion and Safety ProtectionQingdao 266042China

Semiconductors-based heterogeneous photocatalytic water splitting has been extensively studied,but it still remains challenging to accelerate the separation of electron-hole pairs and facilitate the reaction *** we report a general strategy to fabricate highly efficient Pt/TiO_(2)photocatalyst by coupling the Pt co-catalysts and surface oxygen vacancies(VO)of TiO_(2).TiO_(2)was pre-modified with alkali or alkaline earth metals ion solutions,which produce a large number of surface hydroxyl on TiO_(2).Subsequently,the photodeposited Pt sub-nanoparticles substitute surface hydroxyl and induce surface VO on TiO_(2).The coupling of Pt and surface VO on TiO_(2)can accelerate the extraction of photo-charges through the interaction of Pt-VO-Ti bonds and reduce the hydrogen evolution barrier,thereby promoting the photocatalytic *** synthesized Pt-VO-TiO_(2)sample exhibits a photocatalytic hydrogen evolution activity as high as 1.5 L·g^(−1)·h^(−1),which is 2.2 times that of traditional Pt/TiO_(2).Our findings indepth understand the synergistic effect of co-catalysts and defects on photocatalysis and open up new possibilities for achieving robust photocatalytic water splitting.

关键词： oxygen vacancies co-catalyst surface hydroxyl photocatalytic hydrogen evolution reaction(HER)

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A comprehensive set of criteria for evaluating thermal management systems of aerial vehicles

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Science China(Technological Sciences) 2023年第7期66卷 2093-2107页

作者： YIN HuiNing XUAN YiMin LIAN WenLei WANG TianYi School of Energy and Power Engineering Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information TechnologyNanjing University of Aeronautics and AstronauticsNanjing 210016China

Thermal management has become a significant concern in the design of advanced air ***,an effective evaluation method is needed when designers need to evaluate aircraft thermal management systems *** paper proposes an evaluation method in which several evaluation directions concerned with thermal management systems(TMSs) are put forward to form an evaluation index *** effect of temperature control,heat sink utilization efficiency,energy utilization efficiency,flight performance penalty,thermal endurance,space occupancy ratio,and economy are chosen as the direction of evaluation for TMS,considering its primary function,system performance,and impact on aerial *** method is comprehensive,intuitive,and user-friendly,along with the intensely subjective user-defined weight parameters,which provide rational metrics for thermal management techniques involved in aerial *** evaluation method could potentially be helpful for designers to comprehensively analyze the performance of aircraft thermal management systems and provide a basis for practical *** examples are provided to demonstrate the application of the method to evaluating TMS comprehensively.

关键词： comprehensive evaluation method evaluation index system aircraft thermal management system

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Recovery of greenhouse gas as cleaner fossil fuel contributes to carbon neutrality

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Green Energy & environment 2023年第2期8卷 351-353页

作者： Xin Zhang Jian-Rong Li Beijing Key Laboratory for Green Catalysis and Separation and Department of Chemical Engineering Faculty of Environment and LifeBeijing University of TechnologyBeijing 100124China

Under the context of carbon neutrality of China,it is urgent to shift our energy supply towards cleaner fuels as well as to reduce the greenhouse gas ***,coal is the main fossil fuel energy source of *** country is striving hard to replace it with methane,a cleaner fossil *** China has rich geological resources of methane as coal bed methane(CBM)reserves,it is quite challenging to utilize them due to low *** CBM is however mainly emitted directly to atmosphere during coal mining,causing waste of the resource and huge contribution to greenhouse *** recent work by Yang et *** a potential solution to extract low concentration methane selectively from CBM through using MOF materials as *** kind of materials and associated separation technology are promising to reduce greenhouse gas emission and promote the methane production capability,which would contribute to carbon neutrality in dual pathways.

关键词： Carbon neutrality Coal bed methane Metal–organic frameworks Greenhouse gas Fossil fuel

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Renewable biosynthesis of isoprene from wastewater through a synthetic biology approach:the role of individual organic compounds

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Frontiers of environmental Science & engineering 2024年第3期18卷 13-24页

作者： Min Yang Xianghui Li Weixiang Chao Xiang Gao Huan Wang Lu Lu State Key Laboratory of Urban Water Resource and Environment School of Civil and Environmental EngineeringHarbin Institute of TechnologyShenzhen 518055China Center for Materials Synthetic Biology CAS Key Laboratory of Quantitative Engineering Biology of CASShenzhen Institute of Synthetic BiologyShenzhen Institutes of Advanced TechnologyChinese Academic of ScienceShenzhen 518000China Institute of Urban Ecology and Environmental Technology School of Materials and Environmental EngineeringShenzhen Polytechnic UniversityShenzhen 518055China

The biosynthesis of isoprene offers a more sustainable alternative to fossil fuel-based approaches,yet its success has been largely limited to pure organic compounds and the cost remains a *** study proposes a waste-to-wealth strategy for isoprene biosynthesis utilizing genetically engineered *** bacteria to convert organic waste from real food *** impact of organic compounds present in wastewater on *** growth and isoprene production was systematically *** results demonstrated that with filtration pretreatment of wastewater,isoprene yield,and production achieved 115 mg/g COD and 7.1 mg/(L·h),***,even without pretreatment,isoprene yield only decreased by~24%,indicating promising ***,maltose,glycerol,and lactate are effective substrates for isoprene biosynthesis,whereas starch,protein,and acetate do not support *** *** optimum C/N ratio for isoprene production was found to be 8:***,augmenting essential nutrients in wastewater elevated the isoprene yield increased to 159 mg/g *** wastewater biosynthesis significantly reduced the cost(44%–53%decrease,p-value<0.01)and CO_(2)emission(46%–55%decrease,p-value<0.01)compared with both sugar fermentation and fossil fuel–based *** study introduced a more sustainable and economically viable approach to isoprene synthesis,offering an avenue for resource recovery from wastewater.

关键词： Wastewater Resource recovery Genetic engineering Biosynthesis Isoprene

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Microseismic source location using deep learning:A coal mine case study in China

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Journal of Rock Mechanics and Geotechnical engineering 2024年第9期16卷 3407-3418页

作者： Yue Song Enyuan Wang Hengze Yang Chengfei Liu Baolin Li Dong Chen School of Safety Engineering China University of Mining and TechnologyXuzhou221116China State Key Laboratory of Coal Mine Disaster Prevention and Control China University of Mining and TechnologyXuzhou221116China School of Environment and Safety Engineering North University of ChinaTaiyuan030051China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining TechnologyXuzhou221116China

Microseismic source location is crucial for the early warning of rockburst ***,the conventional methods face challenges in terms of the microseismic wave velocity and arrival time *** techniques,such as the full convolutional neural network(FCNN),can capture spatial information but struggle with complex microseismic *** the FCNN with the long shortterm memory(LSTM)network enables better time-series signal classification by integrating multiscale information and is therefore suitable for waveform *** LSTM-FCNN model does not require extensive data preprocessing and it simplifies the microseismic source location through feature *** this study,we utilized the LSTM-FCNN as a regression learning model to locate the seismic ***,the method of short-time-average/long-time-average(STA/LTA)arrival time picking was employed to augment spatiotemporal ***,oversampling the on-site data was performed to address the issue of data imbalance,and finally,the performance of LSTM-FCNN was ***,we compared the LSTM-FCNN model with previous deep-learning *** results demonstrated remarkable location capabilities with a mean absolute error(MAE)of only 7.16 *** model can realize swift training and high accuracy,thereby significantly improving risk warning of rockbursts.

关键词： Microseismic source location Rockburst Deep learning Intelligent early warning

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Experimental investigation on the gravity driven discharge of cohesive particles from a silo with two outlets

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Particuology 2024年第6期89卷 11-21页

作者： Li Dai Zhulin Yuan Fengxian Fan Conghui Gu School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212100China

An experimental study on the gravity driven discharge of cohesive particles from a silo with two outlets was *** discharge behaviors under the conditions that a single outlet was open and two outlets were open were investigated by varying the moisture content of the particles and the filling height of the particles in the *** results show that the discharge rate of the cohesive particles increases gradually at the beginning,then almost keeps constant,and finally drops *** discharge rate in case of two openings is around 1.1–1.6 times that in case of a single *** filling height leads to lower discharge rate in case of a single opening but results in higher discharge rate in case of two ***,the avalanche dynamics in case of a single opening was examined,and the mixing behavior of the cohesive particles was *** is observed that the discharge flow is promoted by the avalanche phenomenon in the silo,generating a general trend that the normalized mass of discharge increases with the filling height at higher moisture *** case of a single opening,the transition from mass flow to funnel flow favors the particle mixing,resulting in an increasing mixing index as the moisture content *** general,a better performance of mixing can be achieved in case of a single opening compared with in case of two *** study provides vital information for fundamental understanding of the gravity driven discharge of cohesive particles from the silo with multiple outlets.

关键词： Cohesive particles Moisture content Discharge rate Avalanche Mixing

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Ethylene purification in a metal–organic framework over a wide temperature range via pore confinement

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Green Energy & environment 2023年第6期8卷 1703-1710页

作者： Xue-Qian Wu Peng-Dan Zhang Xin Zhang Jing-Hao Liu Tao He Jiamei Yu Jian-Rong Li Beijing Key Laboratory for Green Catalysis and Separation and Department of Environmental Chemical Engineering Faculty of Environment and LifeBeijing University of TechnologyBeijing100124China The Key Laboratory of Advanced Functional Materials Ministry of EducationFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing100124China

The separation of C2H4from C_(2)H_(6)/C_(2)H_(4)mixture is of great importance but difficult and energy intensive. Adsorptive separation provides an alternative approach to ameliorate this situation. Here, we report a microporous metal–organic framework(MOF) BUT-315-a as a C_(2)H_(6)-selective adsorbent for the separation of C2H6/C2H4gas mixture. BUT-315-a combines good IAST selectivity of 2.35 with high C_(2)H_(6)uptake of 97.5 cm^(3)g^(-1), giving superior high separation potential ΔQ(2226 mmol L^(-1)) for equimolar C_(2)H_(6)/C_(2)H_(4) at 298 K. Impressively, such excellent performance can be preserved at higher temperatures of 313 and 323 K to accommodate industrial conditions. Efficient dynamic separation performance of BUT-315-a has been demonstrated by column breakthrough experiments under varied temperatures and gas ratios. Theoretical calculations further reveal multiple synergistic interactions between C_(2)H_(6) and the framework. This work highlights a new benchmark material for C_(2)H_(6)/C_(2)H_(4)separation and provides guidance for designing adsorbent for separation applications.

关键词： Metal–organic framework Adsorptive separation Ethylene purification Temperature adaptability Pore confinement

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Microstructure Characterization of Bubbles in Gassy Soil Based on the Fractal Theory

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Journal of Ocean University of China 2024年第1期23卷 129-137页

作者： WU Chen LIN Guoqing LIU Lele LIU Tao LI Chengfeng GUO Zhenqi Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266237China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Marine Environment and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China Qingdao National Laboratory for Marine Science and Technology Qingdao 266237China

The microscopic characterization of isolated bubbles in gassy soil plays an important role in the macroscopic physical properties of sediments and is a key factor in the study of geological hazards in gas-bearing *** on the box-counting method and the pore fractal features in porous media,a fractal model of bubble microstructure parameters in gassy soil under different gas con-tents and vertical load conditions is established by using an industrial X-ray CT scanning *** results show that the fractal di-mension of bubbles in the sample is correlated with the volume fraction of bubbles,and it is also restricted by the vertical *** three-dimensional fractal dimension of the sample is about 1 larger than the average two-dimensional fractal dimension of all the slices from the same *** uniform porous media fractal model is used to test the equivalent diameter,and the results show that the variation of the measured pore diameter ratio is jointly restricted by the volume fraction and the vertical *** addition,the measured self-similarity interval of the bubble area distribution is tested by the porous media fractal capillary bundle model,and the fitting curve of measured pore area ratio in a small loading range is obtained in this paper.

关键词： gassy soil bubble microstructure parameters fractal dimension vertical load

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