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Operando investigation of particle re-entrainment mechanism in electrostatic capture process on the lab-on-a-chip

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Journal of Environmental Sciences 2024年第2期136卷 337-347页

作者： Yong Zhu Yikun Zhang Xiaoyong Yang Shanlong Tao Mingxia Chen Wenfeng Shangguan Research Center for Combustion and Environmental Technology School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Inhalable particle is a harmful air pollutant that causes a significant threat to people's health and ecological environments,which should be removed to purify air,but there exists limited removal efficiency due to particle re-entrainment.Here,Operando observation system based on microscopic visualization method is developed to make in situ test of particle migration,deposition and re-entrainment characteristics on a lab-on-a-chip to achieve the investigation in micro-level scale.The deposition evolution of charged particles is recorded in electric field region intuitively,which confirms the fracture of particle chain occurs during the growth process of deposited particles.It captures the instantaneous process that a larger particle with micron size due to the coagulation of submicron particles fractures from main body of the particle chain for the first time.The analysis of migration behavior of a single submicron particle near electrode surface demonstrates the direct influence of drag force on the fracture of particle chain.This work is the first-time visualization of dynamic process and mechanism elucidation of particle re-entrainment at the micron level,and the findings will provide the theory support for the particle re-entrainment mechanism and bring inspires of enhancing capture efficiency of inhalable particle.

关键词： Inhalable particle Re-entrainment mechanism Operando observation Lab-on-a-chip Capture efficiency

Detrital zircon U-Pb age perspective on the sediment provenance and its geological significance of sandstones in the Lamandau region, SW Borneo, Indonesia

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Journal of Oceanology and Limnology 2022年第2期40卷 496-514页

作者： Shuang LI Saijun SUN Xiaoyong Yang Weidong SUN Zhaojian WU Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration College of Earth SciencesGuilin University of TechnologyGuilin 541004China Center of Deep Sea Research Institute of OceanologyCenter for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China China Coal Geology Group Limited Beijing 100040China

The Southwest Borneo(SW Borneo)block belongs to Sundaland and is the oldest continental fragment of Borneo that is believed to derive from the Gondwana land.The U-Pb isotopic dating ages of 113 detrital zircons from sandstones of the Ketapang Complex in SW Borneo range from 3298 Ma to 78 Ma,and show six major age populations:2476-2344 Ma,2016-1831 Ma,1296-759 Ma,455-406 Ma,262-210 Ma,and 187-78 Ma.The youngest age of these detrital zircons is 78 Ma,indicating that the maximum depositional age of the sandstones is Campanian.Permian-Late Cretaceous detrital zircons are interpreted as having been derived from the nearby Schwaner Mountains and the Permian-Triassic tin belt granitoids in Southeast Asia(SE Asia).Archean-Carboniferous detrital zircons have a continental Gondwana provenance,with their age spectra similar to those of northwestern Australia,indicating that these zircons could be derived from the orogenic belts and cratons in northwestern and central Australia.The provenance of these detrital zircons in this study indicates the SW Borneo block was located on the northwestern margin of Australia during the Paleozoic,in the region of the Banda Embayment.SW Borneo rifted from Australia and moved northward in the Early Jurassic,and this block was added to Sundaland in the Early Cretaceous.The Luconia-Dangerous Grounds continental fragment derived from East Asia collided with SW Borneo after subduction in the Cretaceous,which induced the widespread magmatism in the Schwaner Mountains in SW Borneo.

关键词： detrital zircon U-Pb dating provenance Southwest Borneo(SW Borneo) Sundaland

Recent progress in hydrodynamic characteristics research and application of annular centrifugal extractors

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Frontiers of Chemical Science and Engineering 2022年第6期16卷 854-873页

作者： Hang yang Xiaoyong Yang Xiao Dong Zhaojin Lu Zhishan Bai Yinglei Wang Fulei Gao School of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China Xi'an Modern Chemistry Research Institute Xi'an 710000China

The annular centrifugal extractor(ACE)integrates mixing and separation.It has been widely used in many industrial fields because of its low residence time,compact structure,and high mass transfer efficiency.Most of the literature has focused on flow instabilities,flow visualization,and computational fluid dynamics simulations.More recently,research on hydrodynamic behavior and structural optimization has received widespread attention.With the development of ACE technology,applications have been broadened into several new areas.Hence,this paper reviews research progress regarding ACE in terms of hydrodynamic characteristics and the structural improvements.The latest applications covering hydrometallurgy,nuclear fuel reprocessing,bio-extraction,catalytic reaction,and wastewater treatment are presented.We also evaluate future work in droplet breakup and coalescence mechanisms,structural improvements specific to different process requirements,scaling-up methods,and stability and reliability after scaling-up.

关键词： annular centrifugal extractor hydrodynamic characteristics structure optimization the latest application

Genesis of tuff interval and its uranium enrichment in Upper Triassic of Ordos Basin, NW China

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Acta Geochimica 2018年第1期37卷 32-46页

作者： Shamim Akhtar Nosheen Sahir Xiaoyong Yang CAS Key Laboratory of Crust-Mantle Materials and Environments University of Science and Technology of China Institute of Geology University of the Azad Jammu &KashmirCity Campus School of Engineering and Technology Asian Institute of Technology

Recently measured high gamma ray values in the Yanchang Formation of the Upper Triassic in the Ordos Basin have added an interesting and controversial twist to the study of the formation’s uranium enrichment and genesis.High uranium and thorium contents in the tuffaceous layer cause high gamma ray values in the Yanchang Formation.Petrographic studies,major elements,rare earth elements(REEs),and trace elements have been systematically analyzed to determine the composition,geochemical environment,and diagenetic processes of the layer.The observed color of the tuffaceous layer in the study area varies from yellow to yellowish brown.The tuff consists of matrix supported with sub-rounded to sub-angular lithic fragments.These lithic fragments probably derived from pre-existing rocks and incorporated into the tuffaceous layer during volcanic eruption.Quartz,plagioclase,and biotite were observed in well to poorly sorted form,in addition to framboidal pyrite and organic laminae.Measured ratios of SiO_2/Al_2O_3 ranged from 3.277 to 6.105 with an average of 3.738.The ratio of TiO_2/Al_2O_3 varied from 0.037 to 0.201 with an average of 0.061,indicating that the sediments of the tuffaceous layer originated from an intermediate magma.REE distribution patterns show sharp negative Eu anomalies,indicating a reducing environment,which is suitable for uranium deposition.A reducing environment was confirmed by black shale in the base of the Yanchang Formation.Such black shale has high organic matter content that can take kerogene from mudstone and provide a reducing environment for uranium enrichment in the tuffaceous layer.Moreover,negative Eu anomalies and the REE patterns indicate a subduction-related volcanic arc environment as the magma source of the tuffaceous layers.High values of Rb,Ba,and Sr might be the result of fluid phase activities;low values of Hf and Eu indicate the involvement of crustal material during diagenesis of the tuff.Discrimination diagrams(Th/Yb vs Ta/Yb,Th/Hf vs Ta/Hf)suggest an active continental margin

关键词： Tuffaceous layer Gamma ray values Uranium enrichment Yanchang Formation Ordos Basin

Exploration and Sources of Bauxite Deposit in the Boloven Plateau, Southern Laos

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Journal of Earth Science 2019年第1期30卷 121-130页

作者： Yongzhen Long Xiaoyong Yang Mu yang Dexian Zhang Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationCentral South University School of Geosciences and Info-Physics Central South University CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space SciencesUniversity of Science and Technology of China

The Boloven bauxite deposit occurs either in the weathered basalt(alkali basalt and tholeiite), or in the Cretaceous sandstone. It is generally agreed that the bauxite deposits/laterites overlying the alkali basalt and tholeiite were derived from weathering of underlying basalt, however, the origin of bauxite deposit overlying the sandstone remains controversial. Chondrite-normalized REE patterns show that the bauxite ores/laterites overlying the sandstone exhibit quite similar chondrite-normalized REE patterns to those overlying the alkali basalt. Diagram of Al-Ti-Zr shows that the bauxite ores/laterites overlying the sandstone, tholeiite and alkali basalt are close to each other and to the calc-alkaline suite, however, significantly different from the sandstone and shales. Binary diagram of log Nb/Y vs log Zr/Ti further indicates that the parent rocks of bauxite ores/laterites overlying the sandstone belong to the suit of ultra-alkali to alkali basalt. Multivariate statistical analysis of geochemical data exhibit that the geochemical characteristics of HREE, Y, LREE and Al_2O_3 for bauxite ores/laterites overlying the sandstone are similar to those overlying the alkali basalt(15.7 Ma), obviously different from those overlying the tholeiite(1.2 to 0.5 Ma). Consequently, it can be inferred that the bauxite deposits/laterites overlying the sandstone were derived from the alkali basalt.

关键词： late ritic-type bauxite XRD datum processing exploration sources Boloven Plateau Laos

Photo-enhanced uranium recovery from spent fuel reprocessing wastewater via S-scheme 2D/0D C_(3)N_(5)/Fe_(2)O_(3) heterojunctions

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SusMat 2024年第2期4卷 41-50页

作者： Qi Meng Linzhen Wu Xiaoyong Yang Ying Xiong Fanpeng Kong Tao Duan State Key Laboratory of Environment-friendly Energy Materials NuclearWaste and Environmental Safety Key Laboratory of DefenseSouthwest University of Science and TechnologyMianyangSichuanChina MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage Harbin Institute of TechnologyHarbinHeilongjiangChina Department of Materials Science and Engineering KTH Royal Institute of TechnologyStockholmSweden

Re-extracting environmentally transportable hexavalent uranium from wastew-ater produced by spent fuel reprocessing using the photocatalytic technology is a crucial strategy to avoid uranium pollution and recover nuclear fuel strategic resources.Here,we have designed S-scheme 2D/0D C_(3)N_(5)/Fe_(2)O_(3)heterojunction photocatalysts based on the built-in electric field and the energy band bend-ing theory,and have further revealed the immobilization process of hexavalent uranium conversion into relatively insoluble tetravalent uranium in terms of thermodynamics and kinetics.According to the results,the hexavalent uranium removal and recovery ratios in wastewater are as high as 93.38%and 83.58%,respectively.Besides,C_(3)N_(5)/Fe_(2)O_(3)heterojunctions also exhibit satisfactory cat-alytic activity and selectivity even in the presence of excessive impurity cations(including Na^(+),K^(+),Ca^(^(2+)),Mg^(2+),Sr^(2+),and Eu^(3+))or various organics(such as xylene,tributylphosphate,pyridine,tannic acid,citric acid,and oxalic acid).It is believed that this work can provide a potential opportunity for S-scheme heterojunction photocatalysts to re-enrich uranium from spent fuel wastewater.

关键词： nuclear wastewater S-scheme heterostructure uranium recovery

Oil droplet movement and micro-flow characteristics during interaction process between gas bubble and oil droplet in flotation

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Chinese Journal of Chemical Engineering 2022年第5期35卷 229-237页

作者： Shenglin Yan Yan Zhang Chong Peng Xiaoyong Yang Yuan Huang Zhishan Bai Xiao Xu State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China Sinopec Dalian Research Institute of Petroleum and Petrochemicals Dalian 116041China Institute of Environmental Pollution and Health School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China

Flotation is an efficient pre-treatment technology for oily water.In this work,the interaction process between the moving oil droplet and the gas bubble was studied by high-speed camera and Bassset-Boussinesq-Oseen(BBO)theoretical model,and the experimental and simulation results of the oil droplet trajectory were compared.Moreover,the micro-particle image velocimetry system was utilized to observe the flow inside and outside of the moving oil droplet.The results show that the BBO model with the mobile bubble’s surface can reflect the velocity change trend of the oil droplet during the interaction process between the moving oil droplet and the gas bubble,but there are some significant differences between the experimental and simulation results.While the oil droplet is moving on the bubble’s surface,the velocity of the area near the contact point of oil droplet–gas bubble is less than that of the other areas inside the oil droplet.Meanwhile,the flow of water above the oil drop is more biased towards the gas bubble.

关键词： Flotation Oil droplet-gas bubble interaction Approach process Hydrodynamics

U-Pb Ages and Hf Isotope of Zircons from a Carbonatite Dyke in the Bayan Obo Fe-REE Deposit in Inner Mongolia: its Geological Significance

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Acta Geologica Sinica(English Edition) 2019年第6期93卷 1783-1796页

作者： LAI Xiaodong yang xiaoyong School of Environmental and Chemical Engineering Foshan UniversityFoshanGuangdong 528225China CAS Key Laboratory of Crust-Mantle Materials and Environments University of Science and Technology of ChinaHefei 230026China

Detailed studies on U-Pb ages and Hf isotope have been carried out in zircons from a carbonatite dyke associated with the Bayan Obo giant REE-Nb-Fe deposit,northern margin of the North China Craton(NCC),which provide insights into the plate tectonic in Paleoproterozoic.Analyses of small amounts of zircons extracted from a large sample of the Wu carbonatite dyke have yielded two ages of late Archaean and late Paleoproterozoic(with mean 207 Pb/206 Pb ages of 2521±25 Ma and 1921±14 Ma,respectively).Mineral inclusions in the zircon identified by Raman spectroscopy are all silicate minerals,and none of the zircon grains has the extremely high Th/U characteristic of carbonatite,which are consistent with crystallization of the zircon from silicate,and the zircon is suggested to be derived from trapped basement complex.Hf isotopes in the zircon from the studied carbonatite are different from grain to grain,suggesting the zircons were not all formed in one single process.Majority ofεHf(t)values are compatible with ancient crustal sources with limited juvenile component.The Hf data and their TDM2 values also suggest a juvenile continental growth in Paleoproterozoic during the period of 1940–1957 Ma.Our data demonstrate the major crustal growth during the Paleoproterozoic in the northern margin of the NCC,coeval with the assembly of the supercontinent Columbia,and provide insights into the plate tectonic of the NCC in Paleoproterozoic.

关键词： crustal growth zircon U-Pb age Hf isotope Bayan Obo North China Craton

Hydrothermal ore deposits in collisional orogens

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Science Bulletin 2019年第3期64卷 205-212页

作者： Yongfei Zheng Jingwen Mao Yanjing Chen Weidong Sun Pei Ni Xiaoyong Yang Key Laboratory of Crust-Mantle Materials and Environments Chinese Academy of Sciences School of Earth and Space Sciences University of Science and Technology of China Key Laboratory of Metallogeny and Mineral Assessment Ministry of Natural Rescources Institute of Mineral Resources Chinese Academy of Geological Sciences Key Laboratory of Orogen and Crustal Evolution Ministry of Education School of Earth and Space Sciences Peking University Key Laboratory of Marine Geology and Environment Center of Deep-Sea Research Institute of Oceanology Chinese Academy of Sciences State Key Laboratory for Mineral Deposits Research Institute of Geo-Fluids School of Earth Sciences and Engineering Nanjing University

Hydrothermal ore deposits at convergent plate boundaries represent extraordinary metal enrichment in the continental crust. They are generally associated with felsic magmatism in extensional settings at high thermal gradients. Although their formation is common during accretionary orogeny, more and more ore deposits have been discovered recently in the collisional orogens of China. Because collisional orogeny was operated in a compressional regime at low thermal gradients, it is not favorable for mobilization of ore-forming elements and thus for the production of hydrothermal ore deposits. Nevertheless, continental collision is generally preceded by oceanic subduction, which enables the preliminary enrichment of ore-forming elements in the mantle wedge due to chemical metasomatism by subducting slab-derived fluids. This gave rise to metal pre-enriched domains in the overriding lithosphere, which may be reactivated by extensional tectonism for hydrothermal mineralization either immediately during accretionary orogeny or at a later time during and after collisional orogeny. It is these tectonic processes that have resulted in the progressive enrichment of ore-forming elements through the geochemical differentiation of the subducting oceanic crust, the metasomatic mantle domains and the mafic juvenile crust, respectively, at different depths. Finally, the reactivation of metal pre-enriched domains by continental rifting in the orogenic lithosphere is the key to the metallogenesis of collisional orogens.

关键词： Ore deposits Hydrothermal fluid Accretionary orogen Collisional orogen Rifting orogen Tectonic reactivation