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Atmospheric VOCs in an industrial coking facility and the surrounding area:Characteristics,spatial distribution and source apportionment

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Journal of Environmental Sciences 2024年第4期138卷 660-670页

作者： Meicheng Wen Weiqiang Deng Jin Huang Shu Zhang Qinhao Lin Chaowang shengtao Ma Wanjun wang Xin Zhang Guiying Li Taicheng An Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health Guangdong Key Laboratory of Environmental Catalysis and Health Risk ControlInstitute of Environmental Health and Pollution controlGuangdong University of TechnologyGuangzhou 510006China Guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment Guangzhou Key Laboratory of Environmental Catalysis and Pollution ControlSchool of Environmental Science and EngineeringGuangdong University of TechnologyGuangzhou 510006China Institute of Environmental Science Shanxi UniversityTaiyuan 030006China

Industrial coking facilities are an important emission source for volatile organic compounds(VOCs).This study analyzed the atmospheric VOC characteristics within an industrial coking facility and its surrounding environment.Average concentrations of total VOCs(TVOCs)in the surrounding residential activity areas(R1 and R2),the coking facility(CF)and the control area(CA)were determined to be 138.5,47.8,550.0,and 15.0μg/m^(3),respectively.The cold drum process and coking and quenching areas within the coking facility were identified as the main polluting processes.The spatial variation in VOCs composition was analyzed,showing that VOCs in the coking facility and surrounding areas were mainly dominated by aromatic compounds such as BTX(benzene,toluene,and xylenes)and naphthalene,with concentrations being negatively correlated with the distance from the coking facility(p<0.01).The sources of VOCs in different functional areas across the monitoring area were analyzed,finding that coking emissions accounted for 73.5%,33.3% and 27.7% of TVOCs in CF,R1 and R2,respectively.These results demonstrated that coking emissions had a significant impact on VOC concentrations in the areas surrounding coking facility.This study evaluates the spatial variation in exposure to VOCs,providing important information for the influence of VOCs concentration posed by coking facility to surrounding residents and the development of strategies for VOC abatement.

关键词： Coking facility Volatile organic compounds Emission inventory Spatial distribution Source apportionment

The mechanisms of enhanced thickness-dependent DC breakdown strength of EP/MWCNTs nanocomposites

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High Voltage 2024年第2期9卷 440-452页

作者： Zhen Li He Gao Longfei Zhang Shouming wang Ji Liu shengtao Li Key Laboratory of Engineering Dielectrics and Its Application Ministry of EducationHarbin University of Science and TechnologyHarbinChina State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anChina

Owing to advanced power electronic and electrical applications developing towards miniaturisation and integration,the thickness-dependent DC breakdown mechanism of epoxy/multiwall-carbon-nanotube nanocomposites is under investigation.The results indicate that the breakdown strength of nanocomposites containing 0.05 wt%multiwall-carbon-nanotubes rises by~18%,and the breakdown strength falls exponentially with increasing thickness.To clarify the microscopic mechanism,a simulation model of DC breakdown,including carriers transport and segmental dynamics,is developed,and the accordant simulation results with experimental results indicate that the thickness-dependent DC breakdown of epoxy/multiwall-carbon-nanotube nanocomposites is determined both by segment chain dynamics and charge transport.According to the breakdown model analysis,the effects of multiwall-carbon-nanotube on enhanced breakdown strength are caused by the increased amount of deep traps in the interfacial region,while the influence of thickness is attributed to the enlarged segment chain displacement and electric field distortion as the voltage raising time increases.

关键词： strength breakdown nanocomposites

Novel concept of nano-additive design:PTFE@silica Janus nanoparticles for water lubrication

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Friction 2024年第2期12卷 258-270页

作者： Yanfei LIU Hailing HE Meng YANG Ruize ZHANG shengtao YU Tiantian YANG Wenzhong wang Fuxin LIANG School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China Institute of Polymer Science&Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China MOE Key Laboratory of Bioinformatics Center for Plant BiologySchool of Life SciencesTsinghua UniversityBeijing 100084China Tsinghua-Peking Center for Life Sciences Beijing 100084China College of Biological Sciences China Agricultural UniversityBeijing 100193China

Polytetrafluoroethylene(PTFE)has been widely used as a lubrication additive for reducing friction and wear;however,the hydrophobic nature of PTFE restricts its application in eco-friendly water-based lubrication systems.In this study,for the first time,we designed novel PTFE@silica Janus nanoparticles(JNs)to meet the requirement for additives in water-based lubricants,which have excellent dispersion stability in water attributed to the unique amphiphilic structure.By introducing the lubrication of the aqueous dispersion of the JNs with a concentration of 0.5 wt%,the coefficient of friction(COF)and wear volume were reduced by 63.8%and 94.2%,respectively,comparing to those with the lubrication of pure water.Meanwhile,the JNs suspension also exhibits better lubrication and wear-resistance performances comparing to commercial silica and PTFE suspensions.The excellent tribological behaviors of PTFE@silica JNs as nano-additives could be attributed to the synergetic effect of the two components,where the PTFE provided lubrication through the formed tribofilms on the friction pairs,and the rigid silica further enhanced the wear-resistance performance.Most importantly,the unique structure of JNs makes it possible to use PTFE as an additive in water-lubrication systems.Our study shed light on the design and application of novel JNs nanomaterials as additives to meet the requirements of future industrial applications.

关键词： Janus nanoparticles(JNs) polytetrafluoroethylene(PTFE) nano-additives friction lubrication

Modifiable risk factors for esophageal cancer in endoscopic screening population:A modeling study

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Chinese Medical Journal 2024年第3期137卷 350-352页

作者： Qian Zhang Fan wang Hao Feng Jie Xing shengtao Zhu Hao Zhang Yang Li Wenqiang Wei Shutian Zhang Department of Gastroenterology Beijing Friendship HospitalCapital Medical UniversityNational Clinical Research Center for Digestive DiseaseBeijing Digestive Disease CenterBeijing Key Laboratory for Precancerous Lesion of Digestive DiseaseBeijing 100050China Center for Applied Statistics and School of Statistics Renmin University of ChinaBeijing 100872China Statistical Consulting Center Renmin University of ChinaBeijing 100872China National Cancer Center National Clinical Research Center for CancerCancer InstituteChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China Peking Union Medical College Hospital Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China Department of Gastroenterology Jizhong Energy Fengfeng Group HospitalHandanHebei 056000China RSS and China-Re Life Joint Lab on Public Health and Risk Management Renmin University of ChinaBeijing 100872China

To the Editor:Esophageal cancer,one of the most common cancer types in China,with an estimated 346,633 new cases and 323,600 deaths in 2022,is becoming an increasingly serious clinical and public health problem.^([1])The successful promotion of the self-management strategy has indicated that lifestyle modifications can be valuable in the primary prevention of cancer development.Adopting a healthy lifestyle has become a novel strategy for primary prevention and risk reduction in high-risk areas.Previous epidemiological studies have identified several lifestyle-related risk factors for esophageal cancer,including smoking and diet.^([2])Each factor can typically explain a modest proportion of cancer risk.However,when combined,these known risk factors may substantially affect the risk of esophageal cancer.Nevertheless,some risk factors for esophageal cancer are non-modifiable,including age,low socioeconomic status,and family history.Whether and how these non-modifiable risk factors affect primary cancer prevention by intervening with modifiable risk factors remain unclear.

关键词： esophageal prevention promotion

Plasma induced grain boundaries to boost electrochemical reduction of CO2 to formate

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Journal of Energy Chemistry 2024年第8期95卷 636-643页

作者： Guan wang shengtao Zhong Xiaoqian Xiong Jing Li Fangyuan wang Li Huo Daoxiong Wu Xingqi Han Zhitong wang Qi Chen Xinlong Tian Peilin Deng School of Marine Science and Engineering State Key Laboratory of Marine Resource Utilization in South China Sea Hainan University

Bismuth-based catalysts are highly promising for the electrochemical carbon dioxide reduction reaction（eCO2RR） to formate product.However,achieving high activity and selectivity towards formate and ensuring long-term stability remains challenging.This work reports the oxygen plasma inducing strategy to construct the abundant grain boundaries of Bi/BiOxon ultrathin two-dimensional Bi nanosheets.The oxygen plasma-treated Bi nanosheet（OP-Bi） exhibits over 90% Faradaic efficiency（FE） for formate at a wide potential range from-0.5 to-1.1 V,and maintains a great stability catalytic performance without significant decay over 30 h in flow cell.Moreover,membrane electrode assembly（MEA） device with OPBi as catalyst sustains the robust current density of 100 mA cm-2over 50 h,maintaining a formate FE above 90%.In addition,rechargeable Zn-CO2battery presents the peak power density of1.22 mW cm-2with OP-Bi as bifunctional catalyst.The mechanism experiments demonstrate that the high-density grain boundaries of OP-Bi provide more exposed active sites,faster electron transfer capacity,and the stronger intrinsic activity of Bi atoms.In situ spectroscopy and theo retical calculations further elucidate that the unsaturated Bi coordination atoms between the grain boundaries can effectively activate CO2molecules through elongating the C-O bond,and reducing the formation energy barrier of the key intermediate（*OCOH）,thereby enhancing the catalytic performance of eCO2RR to formate product.

关键词： Bi nanosheet CO2 electroreduction Grain boundary MEA device Unsaturation Bi atoms

Effect of matrix resin components on properties of the semi-conductive shielding material for high-voltage cable

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High Voltage 2024年第2期9卷 419-428页

作者： Guochang Li Tianyao Liu Xiaolong Chen Yanhui Wei Chuncheng Hao shengtao Li Institute of Advanced Electrical Materials Qingdao University of Science and TechnologyQingdaoChina State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anChina

The semi-conductive shielding layer is an important part of the high-voltage cable,playing a role in uniform electric field and reducing the air gap at the interface.The overall performance of the cable is affected by the semi-conductive shielding layer with different base resin composition.The matrix resins of ethylene-vinyl acetate(EVA),ethylene-ethyl acrylate(EEA)and ethylene-butyl acrylate(EBA)were used to prepare the semi-conductive shielding materials of CB/EVA,CB/EEA and CB/EBA.The influences of different matrix resins on the chemical,electrical,thermal and mechanical properties of the shielding materials were investigated.The results show that CB has the best dispersion in EBA resin and the worst dispersion in EEA resin.The temperature in-flection points of CB/EVA,CB/EEA and CB/EBA shielding materials are 90°C,100°C and 110°C,respectively,and the CB/EBA shielding material has the lowest resistivity and the weakest positive temperature coefficient effect at room temperature.The thermal conductivity of all three matrix resins is smaller than that of the shielding material,the thermal conductivity of CB/EVA and CB/EBA shielding materials show a slow increase with temperature,and the CB/EEA shielding material is the least affected by the tem-perature.The mechanical properties of the three matrix resins and the three shielding materials are EBA>EVA>EEA,among them the stress of CB/EBA shielding material is 31.0 MPa and the strain is 570%.This work has important reference significance for the selection of shielding layer matrix resin and material formulation in engineering applications.

关键词： temperature. resin resins

Persistence of charge density wave against variation of band structures in V_(x)Ti_(1−x)Se_(2)(x=0–0.1)

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Nano Research 2024年第3期17卷 2129-2135页

作者： Zhanfeng Liu Tongrui Li Wen Zhu Hongwei Shou Mukhtar Lawan Adam Qilong Cui Yuliang Li Sheng wang Yunbo Wu Hongen Zhu Yi Liu Shuangming Chen Xiaojun Wu shengtao Cui Li Song Zhe Sun National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230029China CAS Key Laboratory of Strongly-coupled Quantum Matter Physics University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China School of Chemistry and Materials Sciences CAS Key Laboratory of Materials for Energy Conversionand CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230026China School Zhejiang Institute of Photonelectronics Jinhua 321004China

Charge density wave(CDW)is a phenomenon that occurs in materials,accompanied by changes in their intrinsic electronic properties.The study of CDW and its modulation in materials holds tremendous significance in materials research,as it provides a unique approach to controlling the electronic properties of materials.TiSe_(2) is a typical layered material with a CDW phase at low temperatures.Through V substitution for Ti in TiSe_(2),we tuned the carrier concentration in V_(x)Ti_(1-x)Se_(2) to study how its electronic structures evolve.Angle-resolved photoemission spectroscopy(ARPES)shows that the band-folding effect is sustained with the doping level up to 10%,indicating the persistence of the CDW phase,even though the band structure is strikingly different from that of the parent compound TiSe_(2).Though CDW can induce the band fold effect with a driving force from the perspective of electronic systems,our studies suggest that this behavior could be maintained by lattice distortion of the CDW phase,even if band structures deviate from the electron-driven CDW scenario.Our work provides a constraint for understanding the CDW mechanism in TiSe_(2),and highlights the role of lattice distortion in the band-folding effect.

关键词： charge density wave band structure lattice distortion

Targeting self-enhanced ROS-responsive artesunatum prodrug nanoassembly potentiates gemcitabine activity by down-regulating CDA expression in cervical cancer

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Chinese Chemical Letters 2023年第7期34卷 186-192页

作者： shengtao wang Kunyi Yu Zhiyu Yu Bingchen Zhang Chaojie Chen Ling Lin Zibo Li Zhongjun Li Yuhua Zheng Zhiqiang Yu Affiliated Foshan Maternity&Child Healthcare Hospital Southern Medical University(Foshan Maternity&Child Healthcare Hospital)Foshan 528000China School of Pharmaceutical Sciences Southern Medical UniversityGuangzhou 510515China Department of Obstetrics and Gynecology Affiliated Dongguan HospitalSouthern Medical UniversityDongguan 523059China

Prodrug self-delivery carriers with targeting that specifically responded to tumor microenvironments have good potential to improve the application dilemma of approved clinical therapeutic drugs(systemic distribution and side effects).It's noted the conversion of gemcitabine(GEM)to inactive ingredients under the action of cytidine deaminase(CDA)during metabolism in vivo limits its clinical effect.A high level of reactive oxygen species(ROS)results in a high level of oxidative stress in tumor cells,which changes the expression of CDA and optimizes the metabolism of GEM in vivo and overcome drug resistance.In this study,the ROS responsive and ROS self-supplied prodrug of artemisia(ART)-thioacetal bond(TK)-GEM was synthesized and self-vectors based on ART-TK-GEM(TK@FA NPs)was prepared by using nano precipitation.ROS responsive characteristics ensure specific release of prodrugs in tumor cells with high level of ROS thereby reducing side effects on normal cells and tissues.The endogenous ROS and newly generated ROS by ART can reduce the expression of CDA and optimizes the metabolism of GEM,and the accumulated ROS can also induce apoptosis of tumor cells,realizing synergistic anti-tumor effect of chemical drugs and traditional Chinese medicines.This paper proposes a simple method by using clinically approved drugs to improve the insufficient effect of existing chemotherapy and overcome resistance,which has potential to appropriately shorten the drug development cycle and accelerate the clinical investigation of drugs.

关键词： ROS self-supplied ROS-responsive Self-delivery carrier Down regulation of CDA Synergistic anti-tumor effect Cervical cancer

Self-oxygenated co-assembled biomimetic nanoplatform for enhanced photodynamic therapy in hypoxic tumor

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Chinese Chemical Letters 2023年第10期34卷 174-179页

作者： Bingchen Zhang Ling Lin Jizong Mao Weisheng Mo Zibo Li shengtao wang Yan Tang Chunhui Cui Yifen Wu Zhiqiang Yu Department of Laboratory Medicine Dongguan Institute of Clinical Cancer ResearchAffiliated Dongguan HospitalSouthern Medical UniversityDongguan 523058China Dongguan Institute of Clinical Cancer Research Dongguan Key Laboratory of Precision Diagnosis and Treatment for TumorsAffiliated Dongguan HospitalSouthern Medical UniversityDongguan 523058China Department of General Surgery Zhujiang HospitalSouthern Medical UniversityGuangzhou 510280China Affiliated Foshan Maternity&Child Healthcare Hospital Southern Medical University(Foshan Maternity&Child Healthcare Hospital)Foshan 528000China

Photodynamic therapy(PDT)has shown great application potential in cancer treatment and the important manifestation of PDT in the inhibition of tumors is the activation of immunogenic cell death(ICD)effects.However,the strategy is limited in the innate hypoxic tumor microenvironment.There are two key elements for the realization of enhanced PDT:specific cellular uptake and release of the photosensitizer in the tumor,and a sufficient amount of oxygen to ensure photodynamic efficiency.Herein,self-oxygenated biomimetic nanoparticles(CS@M NPs)co-assembled by photosensitizer prodrug(Ce6-S-S-LA)and squalene(SQ)were engineered.In the treatment of triple negative breast cancer(TNBC),the oxygen carried by SQ can be converted to reactive oxygen species(ROS).Meanwhile,glutathione(GSH)consumption during transformation from Ce6-S-S-LA to chlorin e6(Ce6)avoided the depletion of ROS.The co-assembled(CS NPs)were encapsulated by homologous tumor cell membrane to improve the tumor targeting.The results showed that the ICD effect of CS@M NPs was confirmed by the significant release of calreticulin(CRT)and high mobility group protein B1(HMGB1),and it significantly activated the immune system by inhibiting the hypoxia inducible factor-1alpha(HIF-1α)-CD39-CD73-adenosine a2a receptor(A2AR)pathway,which not only promoted the maturation of dendritic cells(DC)and the presentation of tumor specific antigens,but also induced effective immune infiltration of tumors.Overall,the integrated nanoplatform implements the concept of multiple advantages of tumor targeting,reactive drug release,and synergistic photodynamic therapy-immunotherapy,which can achieve nearly 90%tumor suppression rate in orthotopic TNBC models.

关键词： Photodynamic therapy Biomimetic nanoplatform Self-oxygenated co-assembly nanoparticles Immunogenic cell death HIF-1α-CD39-CD73-A2AR pathway