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Experimental investigation about the incipient velocity of spherical particles on a hemispherical bed surface

Particuology 2024年第5期88卷 49-61页

作者： Chuannan Li Jie Chen Changbo Jiang Xie Li Zhiyuan Wu School of Hydraulic and Environmental Engineering Changsha University of Science & TechnologyChangsha 410114China Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province Changsha 410114China Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province Changsha 410114China

The sediment particles play a huge role in shaping the bed load *** this research,240 water-tunnel experiments are carried out to investigate the incipient velocity of the observation particles in two particle *** accurately predict the incipient velocity of the observation particles,the equation is conceived by the rolling instability *** incipient velocity equations and experimental data are used to analyze the trend of dispersive pressure and the effect of arrangement position on *** find that it is appropriate to choose the coefficient of drag as 0.261 and the coefficient of lift as 0.198 for the incipient velocity equation of spherical particles on the hemispherical bed ***,the dispersive pressure is closely related to the flow state,particle size,and particle arrangement,which leads to the incipient velocity of the observation particle being at a minimum when the interference particle angle is 45°.Finally,the particle spacing and the projected area changed with the arrangements,directly affecting the incipient velocity of the observed *** analysis of four aspects for the coefficients,dispersive pressure,different particle spacing,and projected area will facilitate the prediction of particle incipient velocity,especially on hemispherical beds.

关键词： Hemispherical bed surface Observed particle Interference particle Dispersive pressure Incipient velocity

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Three-dimensional electrically conductive–hydrophobic layer for stable Zn metal anodes

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SusMat 2024年第3期4卷 164-174页

作者： Yang Mei Jiahui Zhou Botao Zhang Li Li Feng Wu Yongxin Huang Renjie Chen Beijing Key Laboratory of Environmental Science and Engineering School of Material Science&EngineeringBeijing Institute of TechnologyBeijingChina Advanced Technology Research Institute(Jinan) Beijing Institute of TechnologyJinanChina Collaborative Innovation Center of Electric Vehicles Beijing Institute of TechnologyBeijingChina

The interrelated side reactions and dendrites growth severely destabilize the electrode/electrolyte interfaces,resulting in the difficult application of aqueous Zn ion batteries(AZIBs).Hydrophobic protective layer possesses natural inhibition ability for side ***,the conventional protective layer with plane structure is difficult to attain joint regulation of side reaction and Zn ***,a novel three-dimensional(3D)electrically conductive and hydrophobic(3DECH)interface is elaborated to enable stable Zn *** as-prepared 3DECHinterface presents a uniform 3Dmorphologywith hydrophobic property,large specific surface area,abundant zincophilic sites,and excellent ***,the 3DECH interface achieves uniform nucleation and dendrite-free deposition from synergetic benefits:(1)increased nucleation sites and reduced local current density through the special 3D structure and(2)uniform electric potential distribution and rapid Zn^(2+)transport due to the electroconductive alloy chemistry,thus coupling the hydrophobic property to obtain a highly reversible Zn ***,the modified anode achieves a superior coulombic efficiency of 99.88%over 3500 cycles,and the pouch cells using modified anode and LiMn_(2)O_(4)(LMO)cathode retain a capacity of 84 mAh g^(−1)after 700 cycles at a reasonable depth discharge of 36%,without dendrite piercing and“dead Zn.”

关键词： electroconductive layer flat deposition hydrophobic layer three-dimensional surface zincmetal anode

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Density functional theory calculations on 2H-MoS_(2) monolayer for HCHO degradation:Piezoelectric-photocatalytic synergy

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Chinese Chemical Letters 2023年第5期34卷 337-342页

作者： Yushan Zhu Weina Zhao Binghua Jing Junhui Zhou Bihai Cai Didi Li Zhimin Ao Guangzhou Key Laboratory Environmental Catalysis and Pollution Control Guangdong Key Laboratory of Environmental Catalysis and Health Risk ControlSchool of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyKowloonHong Kong 99977China Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal UniversityZhuhai 519087China

Formaldehyde(HCHO)is a common indoor gaseous pollutant,and long-term exposure to it may cause serious damage to the human immune *** degradation of HCHO is a promising ***,most photocatalysts have the disadvantage of rapid recombination of photo-generated electron-hole *** this work,the recombination of photogenerated electron holes was proposed to inhibit through the piezoelectric effect.A two-dimensional(2D)piezoelectric material,2H-MoS_(2),was selected to investigate the catalytic performance for HCHO degradation by the synergy of the piezoelectric and photocatalysis *** results show that the piezoelectric effect can induce the polarization in 2H-MoS_(2) and inhibit the recombination of photogenerated electron-hole pairs,thus improving the photogeneration of hydroxyl radicals for HCHO ***,the piezoelectric-photo-catalysis synergistic effect based on density functional theory(DFT)calculation was proposed to elucidate the HCHO degradation *** work could provide important guidance for the development of effective catalysts for HCHO degradation and the application of 2D piezoelectric materials.

关键词： Piezoelectricity Photocatalysis 2H-MoS_(2) HCHO Degradation

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1D Bi_(2)S_(3) nanorods modified 2D BiOI nanoplates for highly efficient photocatalytic activity:Pivotal roles of oxygen vacancies and Z-scheme heterojunction

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Journal of Materials science & technology 2023年第11期142卷 45-59页

作者： Peng Ju Yu Zhang Lei Hao Jiazhen Cao Xiaofan Zhai Kunpeng Dou Fenghua Jiang Chengjun Sun Key Laboratory of Marine Eco-Environmental Science and Technology Marine Bioresource and Environment Research CenterFirst Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory of Marine Drugs and Bioproducts Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China Department of Chemical Product Engineering College of Chemical Engineering and TechnologyTaiyuan University of TechnologyTaiyuan 030024China College of Information Science and Engineering Ocean University of ChinaQingdao 266100China

In this study,a novel Bi_(2)S_(3)/BiOI Z-scheme photocatalyst with 3D porous hierarchical network-like heterostructure(BSBI NHs)and rich oxygen vacancies(OVs)was fabricated by a facile ion exchange method followed by the in-situ growth process.A possible formation mechanism of BSBI NHs was studied,showing the self-assembled process of in-situ interwoven growth of 1D Bi_(2)S_(3) nanorods(NRs)on the surface of 2D BiOI disk-like nanoplates(NPs),which followed the Ostwald ripening and epitaxial *** modification of BiOI NPs by Bi_(2)S_(3) NRs brought about the formation of Z-scheme heterojunction and massive OVs,which improved the visible-light response property and promoted the separation of photoexcited charge carriers of BSBI *** NHs exhibited a significantly enhanced photocatalytic activity compared with Bi_(2)S_(3) and BiOI,and BSBI-1 can remove almost all bacteria and Rhodamine B(RhB)after 60 min visible light *** addition,the photocatalytic mechanism was studied and speculated based on the tests of active species capture,electron spin resonance(ESR),and density functional theory(DFT)simulation calculation,proving the primary roles of·OH,·O_(2)^(-)and h^(+)during the photocatalytic *** work provides new insights into the design and exploitation of novel heterojunctions with highly efficient photocatalytic performances for environmental remediation applications.

关键词： Antifouling Biofouling BiOI Photocatalysis Bi_(2)S_(3)

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A novel hollow flower shaped Cu9S8 antibacterial agent for removing sulfonamide in water environment: effects of composite with magnetic biochar, differential adsorption, and mechanism study

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environmental science and Pollution Research 2024年第54期31卷 62810-62824页

作者： Li, Rui-Peng Hu, Zheng-Rong Wang, Xing Chen, Jun Liu, Qing-Qing Zhao, Ying Zhao, Zhong-Bao Lu, Xu-Lin Zhang, Zhi-Wei Chemical Engineering College Hebei Normal University of Science and Technology Qinhuangdao066600 China Hebei University of Environmental Engineering Hebei Key Laboratory of Agroecological Safety Qinhuangdao066100 China

In this study, hollow nanoflower spherical Cu9S8 and Cu9S8/Fe3O4@BC with adsorption and antibacterial properties was prepared by coprecipitation and solvothermal method, respectively. The adsorption results showed that the Cu9S8 exhibited excellent adsorption performance on sulfonamide antibiotics (SAs), especially for sulfamethoxazole (SMZ). The optimal addition amount of Cu9S8 is 0.2 g, which results in a maximum adsorption capacity of 33.4 mg/g for SMZ within 120 min. The fitting results of adsorption and desorption kinetics and thermodynamics, as well as the conditions such as pH value and ionic strength were compared. It was found that different interactions led to the differential adsorption of SAs by Cu9S8. The desorption experiment further elucidated its adsorption mechanism. The large desorption capacity indicates that SAs on Cu9S8 can be further recovered and treated. The auto-deposition characteristics of Cu9S8 and the hysteresis loop of Cu9S8/Fe3O4@BC were studied to effectively recover Cu9S8 from aquatic environments. Additionally, more than 99% of Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) were exterminated by Cu9S8 and Cu9S8/Fe3O4@BC within 20 min. The above results suggested that the hollow nanoflower spherical Cu9S8 and Cu9S8/Fe3O4@BC composite materials can provide a new strategy for solving pollution problems and waste treatment. Graphical Abstract: (Figure presented.) © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Escherichia coli

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Molecular monitoring plankton community during jellyfish blooms in the water near the Liaoning Hongyan River Nuclear Power Plant

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Journal of Oceanology and Limnology 2023年第5期41卷 1781-1794页

作者： Ming YUE Tiezhu MI Ying LI Xianyu GONG Yu ZHEN Key Laboratory of Marine Environment and Ecology Ocean University of ChinaMinistry of EducationQingdao 266100China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China

The Liaoning Hongyan River Nuclear Power Plant is located on the east coast of Liaodong Bay in the Bohai Sea,China,and the safety of the cooling water is often threatened by large-scale jellyfish ***,monitoring jellyfish growth,migration,and disappearance is essential to the safety of the nuclear power *** this study,high-throughput sequencing was used to analyze the community characteristics of mesoplankton in the sea area at the inlet and outlet from April to September *** the same time,the micro-individuals of jellyfish(including oosperm,planula,polyps,or ephyra of jellyfish)in the water were detected by real-time fluorescent quantitative PCR(qPCR).Both the maximum abundance of Aurelia coerulea and Nemopilema nomurai in July were detected by high-throughput sequencing and q *** three common taxa of plankton(Paracalanus,Calanoida,and Poaceae)were found in the waters near the inlet and outlet,and the beta diversity of plankton in the waters near the inlet and outlet was low in the same *** on the plankton community composition in the sea water near the inlet,it could be speculated that jellyfish outbreaks would have a significant impact on the plankton via the predation *** maximum mt-16S rDNA copy numbers of *** and *** in the samples from the waters of Liaodong Bay were detected in June 2019,and that of *** showed an increasing trend from north to south,with the jellyfish tending to move to the seawaters near the *** results indicate that the optimum monitoring period for jellyfish outbreaks in Liaodong Bay is from the end of May to the end of July.

关键词： jellyfish Aurelia coerulea Nemopilema nomurai molecular monitoring community

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Micro-amplitude vibration-assisted scratching:a new method for one step and controllable fabrication of the microscale V-groove and nanoscale ripples

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International Journal of Extreme Manufacturing 2025年第3期7卷 398-421页

作者： Haoxiang Wu Hu Huang Zhiyu Zhang Jiwang Yan Key Laboratory of CNC Equipment Reliability Ministry of EducationSchool of Mechanical and Aerospace EngineeringJilin UniversityChangchun 130022People’s Republic of China Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033People’s Republic of China Department of Mechanical Engineering Faculty of Science and TechnologyKeio UniversityYokohama 223-8522Japan

Micro/nano hierarchical structures could endow materials with various surface ***,the multilayer and multiscale characteristics of micro/nano hierarchical structures bring difficulties for their one step and controllable ***,based on tip-based fabrication techniques,this study proposed a micro-amplitude vibration-assisted scratching method by introducing a periodic backward displacement into the conventional scratching process,which enabled the synchronous creation of the microscale V-groove and nanoscale ripples,i.e.a typical micro/nano hierarchical *** experiments and finite element modeling were employed to explore the formation process and mechanism of the micro/nano hierarchical *** different from conventional cutting,this method was mainly based on the plow mechanism,and it could accurately replicate the shape of the indenter on the material *** microscale V-groove was formed due to the scratching action,and the nanoscale ripple was formed due to the extrusion action of the indenter on the microscale V-groove’s ***,the relationships between the processing parameters and the dimensions of the micro/nano hierarchical structures were established through experiments,and optimized processing parameters were determined to achieve regular micro/nano hierarchical *** this method,complex patterns constructed by various micro/nano hierarchical structures were fabricated on both flat and curved surfaces,achieving diverse surface structural colors.

关键词： vibration-assisted scratching tip-based micro/nano fabrication micro/nano hierarchical structure structural color

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Effects of the windshield inclination angle on head/brain injuries in car-to-pedestrian collisions using computational biomechanics models

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Transportation Safety and Environment 2024年第2期6卷 1-12页

作者： Fang Wang Mingliang Wang Lin Hu Ke Peng Jiajie Yin Danqi Wang Liangliang Shi Zhou Zhou School of Automotive and Mechanical Engineering Changsha University of Science and TechnologyChangsha 410114HunanChina Hunan Province Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Changsha University of Science and TechnologyChangsha 410114HunanChina State Key Laboratory of Vehicle NVH and Safety Technology China Automotive Engineering Research Institute Co.Ltd.Chongqing 401122China Division of Neuronic Engineering KTH Ro y al Institute of TechnologyStockholm 14152Sweden

Car-to-pedestrian collision(CPC)accidents occur frequently,and pedestrians often suffer serious head/brain *** major cause is the primary impact with the ***,we use an umerical sim ulation method to study the influence of the windshield in-clination angle of a passenger car on pedestrian head/brain injury due to CPC *** range of the windshield inclination angle was set at 24°-50°,with an interval of 2°.The results show that the windshield angle significantly affects the pedestrian kine-matics and exerts different effects on the head injury when evaluating with various head injury *** the head peak linear/rotational acceleration and acceleration-based head injury criterion(HIC)/rotational injury criterion(RIC),the predictions at the secondary impact stage have no clear relationship with the windshield angle(R^(2)=0.04,0.07,0.03 and 0.26,respectively)and their distributions are *** the primary impact,the peak linear acceleration and HIC show a weak trend of first decreasing and then increasing with the increasing of the windshield angle,and the rotational acceleration and RIC tend to remain relatively *** the cum ulative strain dama ge measure(CSDM)criterion,the predictions at the primary impact are slightly lower than those at the secondary impact,and the trend of first decreasing and then increasing with the increase in the windshield angle is observed at both impact *** the windshield inclination angle is approximately 32°-40°,the head injury severity in both impact phases is generally lower than that predicted at other windshield angles.

关键词： car-to-pedestrian collision(CPC) head/brain injury head injury criterion(HIC) windshield inclination angle computa-tional biomechanics model(CPCBM)

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Simultaneous Feammox and anammox process facilitated by activated carbon as an electron shuttle for autotrophic biological nitrogen removal

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Frontiers of environmental science & engineering 2022年第7期16卷 87-99页

作者： Yingbin Hu Ning Li Jin Jiang Yanbin Xu Xiaonan Luo Jie Cao Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education Institute of Environmental and Ecological EngineeringGuangdong University of TechnologyGuangzhou510006China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou511458China School of Environmental Science and Engineering Guangdong University of TechnologyGuangzhou510006China

Ferric iron reduction coupled with anaerobic ammonium oxidation(Feammox)is a novel ferric-dependent autotrophic process for biological nitrogen removal(BNR)that has attracted increasing attention due to its low organic carbon ***,extracellular electron transfer limits the nitrogen transformation *** this study,activated carbon(AC)was used as an electron shuttle and added into an integrated autotrophic BNR system consisting of Feammox and anammox *** nitrogen removal performance,nitrogen transformation pathways and microbial communities were investigated during 194 days of *** the stable operational period(days 126–194),the total nitrogen(TN)removal efficiency reached 82.9%±6.8%with a nitrogen removal rate of 0.46±0.04 kg-TN/m^(3)/*** contributions of the Feammox,anammox and heterotrophic denitrification pathways to TN loss accounted for 7.5%,89.5%and 3.0%,*** experiments showed that AC was more effective in accelerating the Feammox rate than the anammox rate.X-ray photoelectron spectroscopy(XPS)analyses showed the presence of ferric iron(Fe(III))and ferrous iron(Fe(II))in secondary minerals.X-ray diffraction(XRD)patterns indicated that secondary iron species were formed on the surface of iron-AC carrier(Fe/AC),and Fe(III)was primarily reduced by ammonium in the Feammox *** phyla Anaerolineaceae(0.542%)and Candidatus Magasanikbacteria(0.147%)might contribute to the Feammox process,and Candidatus Jettenia(2.10%)and Candidatus Brocadia(1.18%)were the dominative anammox phyla in the ***,the addition of AC provided an effective way to enhance the autotrophic BNR process by integrating Feammox and anammox.

关键词： Feammox Anammox Extracellular electron transfer Electron shuttle Activated carbon

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Photocatalytic oxidation of methane to methanol over zinc titanate supported silver catalysts

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Journal of Rare Earths 2024年第5期42卷 899-906,I0004页

作者： Yuyan Gan Jinbi Huang Qian Lv Yanru Li Lizhi Wu YU Tang Yuanxing Fang Pengfei Zhu Li Tan Institute of Molecule Catalysis and In-Situ/Operando Studies State Key Laboratory of Photocatalysis on Energy and EnvironmentCollege of ChemistryFuzhou UniversityFuzhou350108China School of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi'an 70021China

The direct activation of methane under mild condition to achieve highly selective of oxygenates is a challenging *** this study,a well dispersed silver supported ZnTiO_(3) catalyst was prepared to achieve selective preparation of methanol from methane and water under mild condition.X-ray diffraction,transmission electron microscopy and X-ray photoelectron spectroscopy characterizations demonstrate that silver species are uniformly dispersed on ZnTiO_(3) surface in the form of metallic silver *** photoelectric characterizations reveal that the addition of silver species enhances light absorption and promotes charge separation of the *** the reaction conditions of 50℃and 3 MPa,the methanol is obtained as the only liquid product over the designed Ag/ZnTiO_(3) catalyst under light *** this photocatalytic process,the holes generated by ZnTiO_(3) activate water to produce intermediate·OH,which further reacts with methane to synthesize *** silver species as co-catalysts extend the light absorption range of ZnTiO_(3) as well as promote charge separation.

关键词： Photocatalytic Methane oxidation Zinc titanate Silver Methanol

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