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Petroleum Science 2024年第3期21卷 2102-2111页

作者： Qiang Li Hui-Zhen Yang Can Yang Qing-Zhu Qiu Wei-Wei Xu Zhao-Zeng Liu College of New Energy China University of Petroleum(East China)

The characteristics of the packing material under an alternating electric field are an important factor in the removal of FCCS particles. In this study, the electric field distribution of a separation unit consisting of packed spheres under an alternating electric field is simulated, and the movement mechanism of catalyst particles is analysed. An "effective contact point" model is derived to predict the adsorption of filler contact points on catalyst particles under the alternating electric field, and the model is validated by simulations and experiments. The numerical calculation and experimental results indicate that the electrical properties of the filler spheres, the filler angle θ, and the frequency f of the alternating electric field affect the adsorption of catalyst particles. As the frequency of the electric field increases, the particle removal efficiency of the high-conductivity filler(silicon carbide) increases and then settles, and the separation efficiency of the low-conductivity filler(glass, zirconia) is not sensitive to the change in electric field frequency.

关键词： Fluid catalytic cracking slurry (FCCS) Particle AC electric field Fillers removal

Enhancement and removal of PM2.5 by Cold and Warm Air Masses Accompanying Certain Synoptic Weather Systems across Hangzhou, China during 2014–2020

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Journal of Meteorological Research 2024年第3期38卷 620-634页

作者： Bu YU Feng CHEN Hanqing KANG Bin ZHU Hongnian LIU Hangzhou Meteorological Bureau Hangzhou International Urbanology Research Center for Urban Governance Studies Zhejiang Institute of Meteorological Sciences Key Laboratory for Aerosol–Cloud–Precipitation of China Meteorological Administration Nanjing University of Information Science&Technology School of Atmospheric Sciences Nanjing University

Local air pollution is strongly affected by synoptic weather systems,such as fronts,troughs,low-altitude vortices,or high-altitude ridges.Nevertheless,few studies have analyzed the meteorological properties of cold or warm air masses associated to these systems and their impact on local air quality.In this study,hourly observations of fine particulate matter (diameter of up to 2.5μm,i.e.,PM2.5),wind （V）,temperature （T）,pressure （P）,and precipitation （R）,acquired in Hangzhou in 2014–2020,were analyzed.From this analysis,weather patterns were categorized into 27types;89 and 94 cases illustrating the passage of warm and cold air masses over Hangzhou were identified,respectively;the influence of air mass temperature,wind speed,and wind direction on PM2.5concentrations and local accumulation or removal was quantified.The main results are as follows.（1） Pollution events occurred more frequently for cold than for warm air masses,but average pollutant concentration was lower for cold air masses;（2） 48%of the cold air mass cases corresponded to PM2.5decreases and 52%to PM2.5increases,with strong cold air masses(?T24h>4℃;|V|average>4 m s-1) markedly reducing local pollution,but weak cold air masses (?T24hremoval occurred in 60%and 40%of the cases,respectively:warm air masses (?T24h>4℃) reduced the PM2.5concentration whereas weaker winds (|V|average<2 m s-1) increased it;and （4） PM2.5concentration decreased sharply within 4 h after the passage of strong cold air masses,but more gradually within 14 h after the passage of strong warm air masses.These results considerably improve the current understanding of the influence of cold and warm air masses on local pollution patterns.

关键词： weather type air mass enhancement removal meteorological condition

Geobacter sulfurreducens promoted the biosynthesis of reduced graphene oxide and coupled it for nitrobenzene reduction

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Journal of Environmental Sciences 2024年第4期138卷 458-469页

作者： Shoujuan Zhang Qi Liu Linrui Zhong Jianhong Jiang Xiaozhe Luo Xingxin Hu Qian Liu Yue Lu College of Environmental Science and Engineering Hunan UniversityChangsha 410082China Shenzhen Research Institute Hunan UniversityShenzhen 510082China Key Laboratory of Environment Biology and Pollution Control Hunan UniversityMinistry of EducationChangsha 410082China China Machinery International Engineering Design&Research Institute Co. LtdChangsha 410007China Hunan Engineering Research Center for Water Treatment Process&Equipment Changsha 410007China

In order to explore an efficient and green method to deal with nitrobenzene(NB)pollutant,reduced graphene oxide(r GO)as an electron shuttle was applied to enhance the extracellular electron transfer(EET)process of Geobacter sulfurreducens,which was a typical electrochemically active bacteria(EAB).In this study,r GO biosynthesis was achieved via the reduction of graphene oxide(GO)by G.sulfurreducens PCA within 3 days.Also,the r GOPCA combining system completely reduced 50-200μmol/L of NB to aniline as end product within one day.SEM characterization revealed that PCA cells were partly wrapped by rGO,and therefore the distance of electron transfer between strain PCA and r GO material was reduced.Beside,the ID/IGof GO,r GO,and r GO-PCA combining system were 0.990,1.293 and 1.31,respectively.Moreover,highest currents were observed in r GO-PCA-NB as 12.950μA/-12.560μA at -408 m V/156 m V,attributing to the faster electron transfer efficiency in EET process.Therefore,the NB reduction was mainly due to:(I)direct EET process from G.sulfurreducens PCA to NB;(II)r GO served as electron shuttle and accelerated electron transfer to NB,which was the main degradation pathway.Overall,the biosynthesis of r GO via GO reduction by Geobacter promoted the NB removal process,which provided a facile strategy to alleviate the problematic nitroaromatic pollution in the environment.

关键词： Reduced graphene oxide Geobacter Nitrobenzene removal Extracellular electron transfer

Facile fabrication of Fe/Zr binary MOFs for arsenic removal in water:High capacity,fast kinetics and good reusability

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Journal of Environmental Sciences 2023年第6期128卷 213-223页

作者： Qi Guo Yuan Li Li-Wei Zheng Xiao-YangWei Yan Xu Yi-Wen Shen Ke-Gang Zhang Chun-Gang Yuan Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science&EngineeringNorth China Electric Power UniversityBaoding 071000China Wetland Research Center for Baiyangdian Lake North China Electric Power UniversityBaoding 071000China

A water-stable bimetallic Fe/Zrmetal-organic framework[UiO-66(Fe/Zr)]for exceptional decontamination of arsenic in water was fabricated through a facile one-step strategy.The batch adsorption experiments revealed the excellent performances with ultrafast adsorption kinetics due to the synergistic effects of two functional centers and large surface area(498.33 m^(2)/g).The absorption capacity of UiO-66(Fe/Zr)for arsenate[As(V)]and arsenite[As(III)]reached as high as 204.1 mg/g and 101.7 mg/g,respectively.Langmuir model was suitable to describe the adsorption behaviors of arsenic on UiO-66(Fe/Zr).The fast kinetics(adsorption equilibrium in 30min,10mg/L As)and pseudo-second-ordermodel implied the strong chemisorption between arsenic ions and UiO-66(Fe/Zr),which was further confirmed by DFT theoretical calculations.The results of FT-IR,XPS analysis and TCLP test demonstrated that arsenic was immobilized on the surface of UiO-66(Fe/Zr)through Fe/Zr-O-As bonds,and the leaching rates of the adsorbed As(III)and As(V)from the spent adsorbent were only 5.6%and 1.4%,respectively.UiO-66(Fe/Zr)can be regenerated for five cycles without obvious removal efficiency decrease.The original arsenic(1.0mg/L)in lake and tapwater was effectively removed in 2.0 hr[99.0%of As(III)and 99.8%of As(V)].The bimetallic UiO-66(Fe/Zr)has great potentials in water deep purification of arsenic with fast kinetics and high capacity.

关键词： Arsenic removal Metal-organic frameworks Bimetallic

Enhanced removal of high-As(Ⅲ)from Cl(-Ⅰ)-diluted SO_(4)(-Ⅱ)-rich wastewater at pH 2.3 via mixed tooeleite and(Cl(-Ⅰ)-free)ferric arsenite hydroxychloride formation

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Journal of Environmental Sciences 2023年第2期124卷 31-41页

作者： Zidan Yuan Guoqing Zhang Xing Wu Xu Ma Jinru Lin Shaofeng Wang Yongfeng Jia Key Laboratory of Pollution Ecology and Environmental Engineering Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control Ministry of EducationHenan Key Laboratory for Environmental Pollution ControlSchool of EnvironmentHenan Normal UniversityHenan 453007China Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education China)School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China

An advanced cost-saving method of removal of high-As(Ⅲ)from SO_(4)(-Ⅱ)-rich metallurgical wastewater has been developed by diluting the SO_(4)(-Ⅱ)content with As(Ⅲ)-Cl(-Ⅰ)-rich metallurgical wastewater and then by the direct precipitation of As(Ⅲ)with Fe(Ⅲ)at pH 2.3.As(Ⅲ)removal at various SO_(4)(-Ⅱ)/Cl(-Ⅰ)molar ratios and temperatures was investigated.The results showed that 65.2–98.2%of As(Ⅲ)immobilization into solids occurred at the SO_(4)(-Ⅱ)/Cl(-I)molar ratios of 1:1–32 and 15–60℃in 3 days,which were far higher than those in aqueous sole SO4(-Ⅱ)or Cl(-Ⅰ)media at the equimolar SO_(4)(-Ⅱ)or Cl(-Ⅰ)and the same temperature.SO_(4)(-Ⅱ)/Cl(-Ⅰ)molar ratio of 1:4 and 25℃were optimal conditions to reach the As removal maximum.Mixed aqueous SO4(-Ⅱ)and Cl(-Ⅰ)played a synergetic role in the main tooeleite formation together with(Cl(-Ⅰ)-free)ferric arsenite hydroxychloride(FAHC)involving the substitution of AsO_(3)^(3−)for Cl(-Ⅰ)for enhanced As fixation.The competitive complexation among FeH_(2)AsO_(3)^(2+),FeSO_(4)^(+)and FeCl^(2+)complexes was the main mechanism for the maximum As(Ⅲ)precipitation at the SO4(-Ⅱ)/Cl(-I)molar ratio of 1:4.Low As(Ⅲ)immobilization at high temperature with increased Fe(Ⅲ)hydrolysis was due to the formation of As(Ⅲ)-bearing ferrihydrite with the relatively high Fe/As molar ratio at acidic pH.

关键词： High-As(III) Sulfate Chlorine ion removal Complex

Construction of MoS_(2) nanoarrays and MoO_(3) nanobelts:Two efficient adsorbents for removal of Pb(Ⅱ),Au(Ⅲ) and Methylene Blue

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Journal of Environmental Sciences 2022年第1期34卷 38-50页

作者： Wen Zhou Jiale Deng Zhen Qin Ruihua Huang Yi Wang Shanshan Tong College of Chemistry and Pharmacy Northwest A&F UniversityYanglingShaanxi 712100China State Key Laboratory of Photoelectric Technology and Functional Materials International Collaborative Center on Photoelectric Technology and Nano Functional MaterialsInstitute of Photonics&Photon-TechnologyNorthwest UniversityXi'an 710069China

Toxic heavy metal ions,valuable noble metal ions and organic dyes are significant concerns in wastewater treatment.In this work,MoO_(3) nanobelts(MoO_(3) NBs)prepared by solvothermal method and MoS_(2) nanoarrays(MoS_(2) NAs)constructed using MoO_(3) NBs precursor were proposed to effectively remove heavy/noble metal ions and organic dyes,such as Pb(II),Au(III)and Methylene Blue(MB).The two adsorbents exhibited the excellent adsorption capacity towards Pb(II),Au(III)and MB.The maximum removal capacity of Pb(II)and MB on MoO_(3) NBs was 684.93 mg/g and 1408 mg/g,respectively,whereas that of Au(III)and MB on MoS_(2) NAs was 1280.2 mg/g and 768 mg/g,respectively.Furthermore,the thermodynamic parameters were calculated from the temperature-dependent curves,suggesting that the removal of Pb(II)and Au(III)on both adsorbents was spontaneous and endothermic.The new adsorbents introduced here were high adsorption activity,ease of fabrication,high scalability,good chemical stability,great repeatability and abundant and cheap supply,which were highly attractive for wastewater treatment.

关键词： Molybdenum-based adsorbents Pb(Ⅱ) Au(Ⅲ) MB removal

Numerical investigation on particles removal by bubble flotation in swirling flow

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Journal of Iron and Steel Research(International) 2022年第6期29卷 961-972页

作者： He-nan Cui Tao Li Yu-lin Zhu Min Tan College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials Chongqing UniversityChongqing 400044China College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063210HebeiChina

The removal of particles is of great importance in many fields including effluent treatment,mineral separation,clean metal production,etc.However,most of the researchers paid their attention to the two-phase flow involving gas–liquid or solid–liquid independently.The motion and interaction between bubbles and particles in the swirling three-phase flow field were simulated by discrete phase model.The swirling flow and the collision between bubbles and particles were governed by compiling the user-defined function program.The centripetal pressure gradient force pushes the discrete phases toward the central region,where the collision rate between particle and bubbles is improved greatly.Moreover,it proved beneficially for particle removal to increase the swirling velocity,particularly for larger particles.Thus,bubble flotation is an effective method to remove particles from the fluid.The swirling velocity was optimized,which is valuable for industrial design.

关键词： Particle removal Swirling flow Blowing bubble Discrete phase model

Experimental Study of the removal of Fine Particulate Matter and Moisture from Flue Gas

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Journal of Thermal Science 2023年第6期32卷 2273-2283页

作者： ZHENG Xin LU Yuan WANG Bo ZHAO Lifeng CAS Key Laboratory of Advanced Energy and Power Institute of Engineering ThermophysicsBeijing100190China University of Chinese Academy of Sciences Beijing100049China

Liquid desiccant systems are promising methods to recover water and waste heat simultaneously from flue gas.Prior research found that the reduction of particulate matter could occur during the absorption processes.In the present paper,experiments were carried out to explore the effect of removing fine particulate matter(PM_(2.5))in a liquid desiccant dehumidifier.Aqueous calcium chloride(CaCl_(2))was used as the desiccant in the experiments.The discrepancies in mass and energy conservation were within±10%and±15%,respectively,which showed the good reliability of the experimental results.Additionally,23.5%–46.0%of the PM_(2.5)and 23.9%–45.1%of the moisture in the flue gas were removed.By comparing the desiccant solution and water,it was found that they could minimally remove PM_(2.5)through washing the flue gas.Regardless of whether the flue gas was dehumidified by water or the solution,the removal fractions of PM_(2.5)of these two methods could be very close if they achieve the same fraction of moisture removal.From the results of a parameter analysis,it was found that the removal fraction of PM_(2.5)was nearly proportional to the removal fraction of moisture within the experimental range.

关键词： flue gas fine particulate matter removal dehumidification

New insight into polystyrene ion exchange resin for efficient cesium sequestration:The synergistic role of confined zirconium phosphate nanocrystalline

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Chinese Chemical Letters 2024年第1期35卷 406-411页

作者： Mengzhou Wang Mingyan Fu Junfeng Li Yihui Niu Qingrui Zhang Qina Sun Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse School of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004China Laboratory of Environmental Technology INETTsinghua UniversityBeijing 100084China

Polystyrene resins(PS)have been practical ion exchangers for radionuclides removal from water.However,nonspecific effects of ion exchange groups continue to be a major obstacle for emergency treatment with coexisting ions of high concentrations.The selectivity for Cs+enables zirconium phosphate(ZrP)to be the most promising inorganic sorbent for radioactive cesium extraction,despite being difficult to synthesize and causing excessive pressure loss in fixed-bed reactors due to fine powder.Herein,through facile confined crystallization in host macropores,we prepared PS confinedα-ZrP nanocrystalline(ZrP-PS).Size-screen sorption of layeredα-ZrP and sulfonic acid group preconcentration of PS synergistically enable a considerably higher Cs+affinity of ZrP-PS than PS,as confirmed by X-ray photoelectron spectroscopy(XPS)analysis.ZrP-PS demonstrated remarkable cesium sequestration performance in both batch and continuous experiments,with a high adsorption capacity of 269.58 mg/g,a rapid equilibrium within 80 min,and a continuous effluent volume of 2300 L/kg sorbents.Given the excellent selectivity for Cs+and flexibility to separate from treated water,ZrP-PS holds great promise as purification packages for the emergency treatment of radioactively contaminated water.

关键词： Zirconium phosphate Nanocrystalline Polystyrene resin Cesium removal

Biofilm removal mediated by Salmonella phages from chicken-related source

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Food Science and Human Wellness 2023年第5期12卷 1799-1808页

作者： Zhenzhen Ning Lingling Zhang Linlin Cai Xinglian Xu Ying Chen Huhu Wang Jiangsu Collaborative Innovation Center of Meat Production and Processing Quality and Safety ControlCollege of Food Science and TechnologyNanjing Agricultural UniversityNanjing 210095China

Salmonella and their biofilm formation are the primary bacterial causes of foodborne outbreaks and crosscontamination. The objective of the study was to investigate the potential of Salmonella phages as an alternative technology for biofilm removal. In this work, 21 Salmonella phages were isolated from a chicken farm and slaughter plant and the phage(CW1)with the broadest spectrum was characterized. Complete genome sequence analysis revealed that the genomes of phage CW1 is composed of 41 763 bp with 58 open reading frames(ORFs)and a holin-endolysin system and it does not encode any virulence or lysogeny. A phage cocktail consisted of CW1(with the broadest spectrum of 70.49%)and CW11, M4 and M10(with a high lytic activity of more than 67.11%)was established. Treatment with the cocktail reduced the cells in the developing biofilm and mature biofilm by 0.79 lg(CFU/cm~2)and 0.4 lg(CFU/cm~2), respectively. More dead cells and scattered extracellular polymeric substances(EPS)were observed by confocal laser scanning microscopy and scanning electron microscopy. Raman analysis found that carbohydrates and proteins were the identification receptors for scattered EPS. This finding suggests that this phage cockta il has potential applications for the sterilization of Salmonella biofilm during meat processing.

关键词： Chicken Salmonella Phage Biofilm removal