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Turbulent Agglomeration of Microparticles in a Cylinder Wake Flow Using LES-DEM:Focusing on the Effect of the Reynolds Number

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Journal of Thermal Science 2025年第1期34卷 34-49页

作者： WANG Shuang MU Lin LI Xue XIE Jun DONG Ming school of Energy and Power engineering Dalian University of TechnologyDalian 116024China school of Optical Information and Energy engineering Wuhan Institute of TechnologyWuhan 430205China school of Energy and environment Shenyang Aerospace UniversityShenyang 110136China

Turbulent agglomeration is viewed as a promising technology for enhancing fine particle removal *** better understand particle transport,agglomeration behaviors,and fluid-particle interactions,we numerically explored these phenomena under cylindrical vortex wake influence using a coupled large eddy simulation and discrete element method(LES-DEM)*** validity of the LES approach was verified by comparison with available direct numerical simulation(DNS)*** adopted the Johnson-Kendall-Roberts(JKR)contact model for particle-particle *** particle dispersion and agglomeration characteristics of particles with different diameters(d_(p)=2-20μm)in the laminar and transition of shear layer(TrSL)flow regimes were *** particles were concentrated at the vortex centers,while larger particles accumulated around the *** agglomeration efficiency exhibited an M-shaped profile spanwise(y-direction).With increasing Reynolds number,the agglomeration efficiency and turbulence intensity *** particle agglomeration efficiency peaks at a certain Reynolds ***,at higher Reynolds numbers,reducing the residence time of particles in the flow field decreases the agglomeration efficiency.

关键词： microparticle particle agglomeration discrete element method large eddy simulation

维普期刊数据库

Enhanced Cd^(2+)removal from aqueous solution using olivine and magnesite combination:New insights into the mechanochemical synergistic effect

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Journal of environmental Sciences 2025年第1期147卷 714-725页

作者： Xiaofang Chen Chao Wang Min Chen Huimin Hu Junwei Huang Ting Jiang Qiwu Zhang school of resources&environmental engineering Wuhan University of TechnologyWuhan 430070China State environmental Protection Key Laboratory of Water environmental Simulation and Pollution Control South China Institute of Environmental SciencesMinistry of Ecology and EnvironmentGuangzhou 510655China

In this study,an efficient stabilizer material for cadmium(Cd^(2+))treatment was successfully prepared by simply co-milling olivine with *** analyticalmethods including XRD,TEM,SEM and FTIR,combined with theoretical calculations(DFT),were used to investigate mechanochemical interfacial reaction between twominerals,and the reaction mechanism of Cd removal,with ion exchange between Cd^(2+)and Mg^(2+)as the main pathway.A fixation capacity of Cd^(2+)as high as 270.61 mg/g,much higher than that of the pristine minerals and even the individual/physical mixture of milled olivine and magnesite,has been obtained at optimized conditions,with a neutral pH value of the solution after treatment to allow its direct *** as-proposed Mg-based stabilizer with various advantages such as cost benefits,green feature etc.,will boosts the utilization efficiency of naturalminerals over the elaborately prepared adsorbents.

关键词： Olivine Magnesite Interface reaction Mechanochemical activation Cadmium removal

Efficient magnetic capture of PE microplastic from water by PEG modified Fe_(3)O_(4)nanoparticles:Performance,kinetics,isotherms and influence factors

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Journal of environmental Sciences 2025年第1期147卷 677-687页

作者： Yifan Zhang Jingjing Duan Ruiqian Liu Evangelos Petropoulos Yanfang Feng Lihong Xue Linzhang Yang Shiying He College of resources and environmental Sciences Nanjing Agricultural UniversityNanjing 210095China Key Laboratory of Agro-environment in Downstream of Yangze Plain Ministry of Agriculture and Rural AffairsInstitute of Agricultural Resources and EnvironmentJiangsu Academy of Agricultural SciencesNanjing 210014China school of engineering Newcastle UniversityNewcastle upon Tyne NE17RUUK Stantec UK Newcastle upon Tyne NE13DYUK

Due to their resistance to degradation,wide distribution,easy diffusion and potential uptake by organisms,microplastics(MPs)pollution has become a major environmental *** this study,PEG-modified Fe_(3)O_(4)magnetic nanoparticles demonstrated superior adsorption efficiency against polyethylene(PE)microspheres compared to other adsorbents(bare Fe_(3)O_(4),PEI/Fe_(3)O_(4)and CA/Fe_(3)O_(4)).Themaximumadsorption capacity of PEwas found to be 2203 mg/g by adsorption isotherm ***/Fe_(3)O_(4)maintained a high adsorption capacity even at low temperature(5℃,2163 mg/g),while neutral pH was favorable for MP *** presence of anions(Cl^(-),SO_(4)^(2-),HCO_(3)^(-),NO_(3)^(-))and of humic acids inhibited the adsorption of *** is proposed that the adsorption process was mainly driven by intermolecular hydrogen ***,the study demonstrated that PEG/Fe_(3)O_(4)can potentially be used as an efficient control against MPs,thus improving the quality of the aquatic environment and of our water resources.

关键词： Microplastic removal Adsorption Magnetic nanoparticles Wastewater Surface modification

Enhancing ozone catalytic decomposition through acid treatment ofα-MnO2 for improved activity and humidity resistance

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Journal of environmental Sciences 2025年第3期149卷 35-45页

作者： Shangchao Xiong Kai Zhang Zhenghao Xu Hongjun Ou Yuanyuan Zheng Xi Li Yue Peng Xubiao Luo Junhua Li school of Life Sciences Jinggangshan UniversityJi’an 343009China Faculty of Geosciences and environmental engineering Southwest Jiaotong UniversityChengdu 610031China State Key Joint Laboratory of environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

Post-etching method using dilute acid solutions is an effective technology to modulate the surface compositions of metal-oxide *** theα-MnO2 catalyst treated with 0.1 mol/L nitric acid exhibits higher ozone decomposition activity at high relative humidity than the counterpart treated with acetic *** the increases in surface area and lattice dislocation,the improved activity can be due to relatively higher Mn valence on the surface and newly-formed Brønsted acid sites adjacent to oxygen *** remnant nitro species deposited on the catalyst by nitric acid treatment is ideal hydrophobic groups at ambient *** decomposition route is also proposed based on the DRIFTS and DFT calculations:ozone is facile to adsorb on the oxygen vacancy,and the protonic H of Brønsted acid sites bonds to the terminal oxygen of ozone to accelerate its cleavage to O2,reducing the reaction energy barrier of O2 desorption.

关键词： Ozone decomposition α-MnO2 Brønsted acid sites H-bonds Post-etching

Microwave irradiation-induced deterioration of rock mechanical properties and implications for mechanized hard rock excavation

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Journal of Rock Mechanics and Geotechnical engineering 2025年第1期17卷 275-290页

作者： Zheng Yang Ming Tao Muhammad Burhan Memon Dengdeng Zhuang Yan Zhao school of resources and Safety engineering Central South UniversityChangshaChina

In this study,a novel microwave-water cooling-assisted mechanical rock breakage method was proposed to address the issues of severe tool wear at elevated temperatures,poor rock microwave absorption,and excessive microwave energy *** investigation object was sandstone,which was irradiated at 4 kW microwave power for 60 s,180 s,300 s,and 420 s,followed by air and water ***,uniaxial compression,Brazilian tension,and fracture tests were *** evolution of damage in sandstone was measured using active and passive nondestructive acoustic detection *** roughness of the fracture surfaces of the specimens was quantified using the box-counting *** damage mechanisms of microwave heating and water cooling on sandstone were discussed from both macroscopic and microscopic *** experimental results demonstrated that as the duration of the microwave irradiation increased,the P-wave velocity,uniaxial compressive strength(UCS),elastic modulus(E),tensile strength,and fracture toughness of sandstone exhibited various degrees of weakness and were further weakened by water ***,an increase in the microwave irradiation duration enhanced the damaging effect of water *** P-wave velocity of the sandstone was proportional to the mechanical *** heating and water cooling weakened the brittleness of the sandstone to a certain *** fractal dimension of the fracture surface was correlated with the duration of microwave heating,and the water-cooling treatment resulted in a rougher fracture *** analysis of the instantaneous cutting rate revealed that water cooling can substantially enhance the efficiency of microwave-assisted rock breakage.

关键词： Hard rock breakage Microwave irradiation Water cooling Acoustic testing Fractal dimension Instantaneous cutting rate

Quantifying and Mapping the Effects of Ecosystem Services on Agricultural Competitiveness:A Case Study in Shandong Province, China

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Chinese Geographical Science 2025年第2期 326-342页

作者： ZHONG Jiali SUN Qian QI Wei YU Xinyang College of resources and environment Shandong Agricultural University school of Information Science and engineering Shandong Agricultural University Institute of Geographic Sciences and Natural resources Research Chinese Academy of Sciences

Quantifying and mapping how ecosystem services impact agricultural competitiveness is crucial for attaining the Sustainable Development Goals of United Nations. However, few study quantified agricultural competitiveness and mapped the effects of ecosystem services on agricultural competitiveness using multiple models. In this study, multi-source data from 2000 to 2020 were utilized to establish the indicator system of agricultural competitiveness; five ecosystem services were quantified using computation models; Geographic Information System(GIS) spatial analysis was used to explore the spatial patterns of agricultural competitiveness and ecosystem services; geographic detector models were applied to investigate the effects and driving mechanisms of ecosystem services on agricultural competitiveness. Shandong Province of China was selected as the case study area. The results demonstrated that: 1) there was a significant increase in agricultural competitiveness during the study period, with high levels observed mainly in the east region of the study area. 2) The spatial distribution patterns of ecosystem services and agricultural competitiveness primarily exhibited High-High and Low-Low Cluster types. 3) Habitat quality emerged as the main driving factor of agricultural competitiveness in 2000 and 2020, while water yield played a substantial role in 2010.4) The coupling of two ecosystem services exerted a greater effect on agricultural competitiveness compared to individual ecosystem service. The innovations of this study are constructing an indicator system to quantify agricultural competitiveness, and exploring the effects of ecosystem services on agricultural competitiveness. This study proposed an indicator system to quantify agricultural competitiveness, which can be applied in other regions, and explored the effects of ecosystem services on agricultural competitiveness. The findings of this study can serve as valuable insights for policymakers to formulate tail

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Introducing strong metal–oxygen bonds to suppress the Jahn-Teller effect and enhance the structural stability of Ni/Co-free Mn-based layered oxide cathodes for potassium-ion batteries

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Journal of Energy Chemistry 2025年第2期101卷 713-722页

作者： Yicheng Lin Shaohua Luo Pengyu Li Jun Cong Wei Zhao Lixiong Qian Qi Sun Shengxue Yan school of Materials Science and engineering Northeastern University school of resources and Materials Northeastern University at Qinhuangdao Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province

Mn-based layered oxides（KMO） have emerged as one of the promising low-cost cathodes for potassiumion batteries（PIBs）.However,due to the multiple-phase transitions and the distortion in the MnO6structure induced by the Jahn-Teller（JT） effect associated with Mn-ion,the cathode exhibits poor structural ***,we propose a strategy to enhance structural stability by introducing robust metal-oxygen（M-O） bonds,which can realize the pinning effect to constrain the distortion in the transition metal（TM） ***,all the elements employed have exceptionally high crustal *** a proof of concept,the designed K0.5Mn0.9Mg0.025Ti0.025Al0.05O2cathode exhibited a discharge capacity of approximately 100 mA h g-1at 20 mA g-1with 79% capacity retention over 50 cycles,and 73% capacity retention over 200 cycles at 200 mA g-1,showcased much better battery performance than the designed cathode with less robust M-O *** properties of the formed M-O bonds were investigated using theoretical *** enhanced dynamics,mitigated JT effect,and improved structural stability were elucidated through the in-situ X-ray diffractometer（XRD）,in-situ electrochemical impedance spectroscopy（EIS）(and distribution of relaxation times（DRT） method),and ex-situ X-ray absorption fine structure（XAFS） *** study holds substantial reference value for the future design of costeffective Mn-based layered cathodes for PIBs.

关键词： Jahn-Teller effect Layered oxide cathodes Low-cost Potassium-ion batteries Robust M–O bonds

Tandemly promoting the sulfur redox kinetics through low concentration mixed organodiselenide and organoditelluride in Ah-level high-energydensity Li-S batteries

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Science China Materials 2025年第1期68卷 207-216页

作者： Jiangqi Zhou Chengyong Shu Qianyu Zhang Wei Tang Yuping Wu school of Chemical engineering and Technology Xi’an Jiaotong UniversityXi’an 710049China school of Energy and environment Southeast UniversityNanjing 210096China College of Materials Science and engineering Sichuan UniversityChengdu 610064China school of Chemical engineering Kunming University of Science and TechnologyKunming 650500China

Homogeneous redox mediation is efficient in alleviating the shuttling effect and slow redox kinetics of lithium polysulfides in lithium-sulfur ***,their perfect performance is not fulfilled owning to the fact that the multi-step transformation of lithium polysulfides requests the multifunctional active positions for the tandem *** on the redox comediation principles,a promoter of mixing organodiselenide and organoditelluride(mixed-Se/Te)was raised to induce tandem catalysis and boost the effective electrochemical conversion of lithium *** specifically,diphenyl diselenide facilitated the liquid-liquid and solid-liquid transformation between lithium polysulfides and sulfur,while diphenyl ditelluride improved the solid-liquid transformation concerning lithium sulfide ***,even under high sulfur loading of 6.5 mg cm^(−2) and low electrolyte/sulfur ratio of 5.88μL mg^(−1),the 10 mM low concentration mixed-Se/Te promoter offered a high discharge capacity of 6.6 mAh cm^(−2) and high rate performance of 4.1 mAh cm^(−2) at 0.5 ***,the assembled 1.5 Ah-level lithium-sulfur pouch cells provide an energy density of 332 Wh kg^(−1) at 0.05 C and good cycling *** research demonstrates the applicability of propelling continuous sulfur conversion reactions with detached active positions and is anticipated to stimulate deep molecular design of kinetic promoter to targeted energy-associated redox reactions.

关键词： lithium-sulfur batteries redox kinetics tandem catalysis organodiselenide organoditelluride

Facile construction of heterogeneous dual-ionic poly(ionic liquid)s for efficient and mild conversion of CO_(2)into cyclic carbonates

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Journal of environmental Sciences 2025年第3期149卷 177-187页

作者： Guanqun Xie Jiaxiang Qiu Huadeng Li Hongbin Luo Shuo Li Yanbin Zeng Ke Zheng Xiaoxia Wang school of environment and Civil engineering Dongguan University of TechnologyDongguan 523808China school of Materials Science and engineering Guangdong Provincial Engineering Technology Research Center of Key Material for High Performance Copper Clad LaminateDongguan University of TechnologyDongguan 523808China

In the context of peaking carbon dioxide emissions and carbon neutrality,development of feasible methods for converting CO_(2)into high value-added chemicals stands out as a hot *** this study,P[D+COO^(−)][Br^(−)][DBUH^(+)],a series of novel heterogeneous dual-ionic poly(ionic liquid)s(PILs)were synthesized readily from 2-(dimethylamino)ethyl methacrylate(DMAEMA),bromo-substituted aliphatic acids,organic bases and divinylbenzene(DVB).The structures,compositions and morphologies were characterized or determined by nuclear magnetic resonance(NMR),thermal gravimetric analysis(TGA),infrared spectroscopy(IR),scanning electron microscopes(SEM),and Brunauer-Emmett-Teller analysis(BET),*** of the P[D+COO^(−)][Br^(−)][DBUH^(+)]series as catalysts in converting CO_(2)into cyclic carbonates showed that P[D+COO^(−)][Br^(−)][DBUH^(+)]-2/1/0.6was able to catalyze epiclorohydrin-CO_(2)cycloaddition the most *** afforded chloropropylene carbonate(CPC)in 98.4%yield with≥99%selectivity in 24 hr under solvent-and additive-free conditions at atmospheric *** experiments showed that recycling of the catalyst 6 times only resulted in a slight decline in the catalytic *** addition,it could be used for the synthesis of a variety of differently substituted cyclic carbonates in good to excellent ***,key catalytic active sites were probed,and a reasonable mechanism was proposed *** summary,this work poses an efficient strategy for heterogenization of dual-ionic PILs and provides amild and environmentally benign approach to the fixation and utilization of carbon dioxide.

关键词： Dual-ionic poly(ionic liquid)s CO_(2)cycloaddition Epoxides Cyclic carbonates Heterogeneous catalysts