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Dual-reaction-center catalytic process continues Fenton's story

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Frontiers of Environmental Science & Engineering 2020年第5期14卷 65-73页

作者： Chao Lu Kanglan Deng Chun Hu Lai Lyu Institute of Environmental Research at Greater Bay Area Key Laboratory for Water Quality and Conservation of the Pearl River Delta(Ministry of Education)Guangzhou UniversityGuangzhou 510006China

Triggered by global water quality safety issues,the research on wastewater treatment and water purification technology has been greatly developed in recent *** Fenton technology is particularly powerful due to the rapid attack on pollutants by the generated hydroxyl radicals(·OH).However,both heterogeneous and homogeneous Fenton/Fenton-like technologies follow the classical reaction mechanism,which depends on the oxidation and reduction of the transition metal ions at single *** even after a century of development,this reaction still suffers from its inherent bottlenecks in practical *** recent years,our group has been focusing on studying a novel heterogeneous Fenton catalytic process,and we developed the dual-reaction-center(DRC)system for the first *** the DRC system,H2O2 and O2 can be efficiently reduced to reactive oxygen species(ROS)in electron-rich centers,while pollutants are captured and oxidized by the electron-deficient *** obtained electrons from pollutants are diverted to the electron-rich centers through bonding *** process breaks through the classic Fenton mechanism,and improves the performance and efficiency of pollutant removal in a wide pH ***,we provide a brief overview of Fenton's story and focus on combing the discovery and development of the DRC technology and mechanism in recent *** construction of the DRC and its performance in the pollutant degradation and interfacial reaction process are described in *** look forward to bringing a new perspective to continue Fenton's story through research and development of DRC technology.

关键词： Dual reaction centers Fenton Pollutant utilization Electron transfer

Zn^(2+) loading as a critical contributor to the circ_0008553-mediated oxidative stress and inflammation in response to PM_(2.5) exposures

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Journal of Environmental Sciences 2023年第2期124卷 451-461页

作者： Jingzhou Wang Jianbo Jia Dujia Wang Xiujiao Pan Haiyan Xiong Chengjun Li Yiguo Jiang Bing Yan Institute of Environmental Research at Greater Bay Area Key Laboratory for Water Quality and Conservation of the Pearl River DeltaMinistry of EducationGuangzhou UniversityGuangzhou 510006China School of Environmental Science and Engineering Shandong UniversityQingdao 266237China Institute for Chemical Carcinogenesis Guangzhou Medical UniversityGuangzhou 511436China

Inflammation is a major adverse outcome induced by inhaled particulate matter with a diameter of≤2.5μm(PM_(2.5)),and a critical trigger ofmost PM_(2.5) exposure-associated ***,the key molecular events regulating the PM_(2.5)-induced airway inflammation are yet to be *** the critical role of circular RNAs(circRNAs)in regulating inflammation,we predicted 11 circRNAs that may be involved in the PM_(2.5)-induced airway inflammation using three previously reportedmiRNAs through the starBasewebsite.A novel circRNA circ_0008553 was identified to be responsible for the PM_(2.5)-activated inflammatory response in human bronchial epithelial cells(16HBE)via inducing oxidative *** a combinatorial model PM_(2.5) library,we found that the synergistic effect of the insoluble core and loaded Zn^(2+)ions at environmentally relevant concentrations was the major contributor to the upregulation of circ_0008553 and subsequent induction of oxidative stress and inflammation in response to PM2.5 *** findings provided new insight into the intervention of PM_(2.5)-induced adverse outcomes.

关键词： PM(2.5) Toxic composition Combinatorial model PM_(2.5)library Circ_0008553 Inflammation

Selective Laser Melting of Commercially Pure Silicon

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Journal of Wuhan University of Technology(Materials Science) 2022年第6期37卷 1155-1165页

作者： LAI Zhouyi GUO Ting ZHANG Shengting KOLLO Lauri ATTAR Hooyar WANG Zhi PRASHANTH Konda Gokuldoss Sino-German Robotics School Shenzhen Institute of Information TechnologyShenzhen 518172China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510641China Centre for Advanced Materials Processing and Manufacturing School of Mechanical and Mining EngineeringThe University of QueenslandBrisbaneQueensland 4072Australia Department of Mechanical and Industrial Engineering Tallinn University of TechnologyTallinn 19086Estonia Erich Schmid Institute of Materials Science Austrian Academy of SciencesLeoben A-8700Austria Centre for Biomaterials Cellular and Molecular TheranosticsVellore Institute of TechnologyVelloreTamil Nadu 632014India

Selective laser melting(SLM)or Laser-based powder bed fusion(LBPF)is gaining much attention for the fabrication of novel materials with complex shapes,improved functionalities,and *** attempt has been made to fabricate hard and brittle silicon via SLM in the absence of any *** different powder batches were used,where one of the powder batches has 0.3wt%Fe and the other batch with 0.02wt%*** parameter optimization process shows that the SLM Si samples were successfully fabricated from the powders with the minor addition of *** deliberate addition of Fe facilitates heterogeneous nucleation of Si and aids in absorbing the laser energy beam more *** Si samples with 98.5%theoretical density were fabricated with a hardness of around 10.65±40 *** experimental results show that SLM can successfully fabricate Si without cracks and with near theoretical density(of 99%)and complex shapes,which opens their use in wider industrial applications.

关键词： additive manufacturing selective laser melting silicon heterogeneous nucleation

Towards growth of pure AB-stacked bilayer graphene single crystals

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Nano Research 2024年第5期17卷 4616-4621页

作者： Xiaowen Zhang Tao Zhou Yunlong Ren Zuo Feng Ruixi Qiao Qinghe Wang Bin Wang Jinxia Bai Muhong Wu Zhilie Tang Xu Zhou Kaihui Liu Xiaozhi Xu guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum MaterialsSchool of PhysicsSouth China Normal UniversityGuangzhou 510006China guangdong-Hong Kong Joint Laboratory of Quantum Matter School of PhysicsSouth China Normal UniversityGuangzhou 510006China Physical Science and Engineering Division King Abdullah University of Science and TechnologyThuwal 23955–6900Saudi Arabia State Key Laboratory for Mesoscopic Physics Frontiers Science Center for Nano-optoelectronicsSchool of PhysicsPeking UniversityBeijing 100871China Institute for Frontier Science Nanjing University of Aeronautics and AstronauticsNanjing 210094China International Centre for Quantum Materials Collaborative Innovation Centre of Quantum MatterPeking UniversityBeijing 100871China Songshan Lake Materials Laboratory Institute of PhysicsChinese Academy of SciencesDongguan 523808China

Given its intriguing band structure and unique tunable bandgap,AB-stacked bilayer graphene has great potentials in the applications of high-end electronics,optoelectronics and *** epitaxial growth of AB-stacked single-crystal bilayer graphene films requires a strict AB-stacked lattice,identical orientations and seamless stitching of bilayer graphene ***,the particles inevitably present on the metal surface that produced during high temperature growth would induce random orientations,twisted stacking islands,and uncontrollable multilayers,which is a great challenge to ***,we propose a heat-resisting-box assisted strategy to produce nearly pure AB-stacked bilayer graphene single-crystal films on Cu/Ni(111)*** our technique,the particles on the Cu/Ni(111)surface are effectively eliminated,which greatly minimizes the occurrence of randomly twisted islands and uncontrollable *** as-grown AB-stacked bilayer graphene films show>99%alignment and>99%AB stacking *** work provides a promising method towards the growth of pure AB-stacked bilayer graphene single crystals and would accelerate its device applications.

关键词： bilayer graphene AB stacking uniform growth heat-resisting box

Identification of important precursors and theoretical toxicity evaluation of byproducts driving cytotoxicity and genotoxicity in chlorination

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Frontiers of Environmental Science & Engineering 2020年第2期14卷 125-137页

作者： Qian-Yuan Wu Yi-Jun Yan Yao Lu Ye Du Zi-Fan Liang Hong-Ying Hu Key Laboratory of Microorganism Application and Risk Control of Shenzhen Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental SafetyGraduate School at ShenzhenTsinghua UniversityShenzhen 518055China Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen InstituteShenzhen 518055China Environmental Simulation and Pollution Control State Key Joint Laboratory State Environmental Protection Key Laboratory of Microorganism Application and Risk Control(SMARC)School of EnvironmentTsinghua UniversityBeijing 100084China

Chlorination,the most widely used disinfection process for water treatment,is unfortunately always accompanied with the formation of hazardous disinfection byproducts(DBPs).Various organic matter species,like natural organic matter(NOM)and amino acids,can serve as precursors of DBPs during chlorination but it is not clear what types of organic matter have higher potential *** regulation of DBPs such as trihalomethanes has received much attention,further investigation of the DBPs driving toxicity is *** study aimed to identify the important precursors of chlorination by measuring DBP formation from NOM and amino acids,and to determine the main DBPs driving toxicity using a theoretical toxicity evaluation of contributions to the cytotoxicity index(CTI)and genotoxicity index(GTI).The results showed that NOM mainly formed carbonaceous DBPs(CDBPs),such as trichloromethane,while amino acids mainly formed nitrogenous DBPs(N-DBPs),such as dichloroacetonitrile(DCAN).Among the DBPs,DCAN had the largest contribution to the toxicity index and might be the main driver of *** the precursors,aspartic acid and asparagine gave the highest DCAN concentration(200 g/L)and the highest CTI and ***,aspartic acid and asparagine are important precursors for toxicity and their concentrations should be reduced as much as possible before chlorination to minimize the formation of *** chlorination of NOM,tryptophan,and asparagine solutions with different chlorine doses and reaction times,changes in the CTI and GTI were consistent with changes in the DCAN concentration.

关键词： Chlorination Dichloroacetonitrile Aspartic acid Asparagine Toxicity index

Enhanced Fenton-like process over Cu/L(+)-ascorbic acid co-doping mesoporous silica for toxicity reduction of emerging contaminants

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Frontiers of Environmental Science & Engineering 2024年第4期18卷 49-60页

作者： Yuhang Liu Wenxuan Deng Xiaojun Wu Chun Hu Lai Lyu Key Laboratory for Water Quality and Conservation of the Pearl River Delta(Ministry of Education) Institute of Environmental Research at Greater BayGuangzhou UniversityGuangzhou 510006China

Effective removal of emerging contaminants(ECs)to minimize their impacts on human health and the natural environment is a global *** the removal of ECs in water,we fabricated a seaweed spherical microsphere catalyst with Cu cation-πstructures by in situ doping of Cu species and ascorbic acid in mesoporous silica(Cu-C-MSNs)via a hydrothermal *** results indicate that bisphenol A(BPA)is substantially degraded within 5 min under natural conditions,with its biological toxicity considerably ***,industrial wastewater could also be effectively purified by Cu-C-MSNs/H_(2)O_(2) *** presence of metal sites and the complexation of ECs via cation-πinteraction andπ-πstacking on the catalyst surface were directly responsible for the polarization distribution of electrons,thus activating H_(2)O_(2) and dissolved oxygen(DO).The removal of contaminants could be attributed primarily to 1)the activation of H_(2)O_(2) into ^(·)OH to attack the contaminants and 2)self-cleavage because of the transfer of electrons from the contaminants to the *** study provides an innovative solution for the effective treatment of ECs and has positive implications for easing global environmental crises.

关键词： Cation-πstructures Polarization electric field Fenton-like process Contaminants cleavage

Understanding Molecular Dynamics with Stochastic Processes via Real or Virtual Dynamics

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Chinese Journal of Chemical Physics 2017年第6期30卷 735-760,I0003页

作者：李德彰陈子飞张志军刘剑北京大学化学与分子工程学院北京分子科学国家实验室理论与计算化学研究所北京100871

Molecular dynamics with the stochastic process provides a convenient way to compute structural and thermodynamic properties of chemical, biological, and materials systems. It is demonstrated that the virtual dynamics case that we proposed for the Langevin equation [J. Chem. Phys. 147, 184104 （2017）] in principle exists in other types of stochastic thermostats as well. The recommended ＂middle＂ scheme [J. Chem. Phys. 147, 034109 （2017）] of the Andersen thermostat is investigated as an example. As shown by both analytic and numerical results, while the real and virtual dynamics cases approach the same plateau of the characteristic correlation time in the high collision frequency limit, the accuracy and efficiency of sampling are relatively insensitive to the value of the collision frequency in a broad range. After we compare the behaviors of the Andersen thermostat to those of Langevin dynamics, a heuristic schematic representation thermostatting processes with molecular is proposed for understanding efficient stochastic dynamics.

关键词： Stochastic process Thermostat Molecular dynamics Virtual dynamics Andersen thermostat Canonical ensemble

Single-atomic tungsten-doped Co_(3)O_(4) nanosheets for enhanced electrochemical kinetics in lithium–sulfur batteries

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Carbon Energy 2023年第8期5卷 31-41页

作者： Sangni Wang Riming Hu Ding Yuan Lei Zhang Chao Wu Tianyi Ma Wei Yan Rui Wang Liang Liu Xuchuan Jiang Hua Kun Liu Shi Xue Dou Yuhai Dou Jiantie Xu National Engineering Laboratory for VOCs Pollution Control Technology and Equipment Guangdong Provincial Key Laboratory of Atmospheric EnvironmentPollution Control School of Environment and EnergySouth China University of TechnologyGuangzhouChina Shandong Institute of Advanced Technology JinanChina School of Materials Science and Engineering Institute for Smart Materials&EngineeringUniversity of JinanJinanChina Institute of Energy Materials Science University of Shanghai for Science and TechnologyShanghaiChina Institute for Superconducting and Electronic Materials University of WollongongWollongongAustralia School of Science RMIT UniversityMelbourneVictoriaAustralia State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghaiChina

The practical application of lithium–sulfur batteries(LSBs)is severely hindered by the undesirable shuttling of lithium polysulfides(LiPSs)and sluggish redox kinetics of sulfur ***,a series of ultrathin singleatomic tungsten-doped Co_(3)O_(4)(Wx-Co_(3)O_(4))nanosheets as catalytic additives in the sulfur cathode for LSBs are rationally designed and *** from the enhanced catalytic activity and optimized electronic structure by W doping,the Wx-Co_(3)O_(4) not only reduces the shuttling of LiPSs but also decreases the energy barrier of sulfur redox reactions of sulfur species,leading to accelerated electrode *** a result,LSB cathodes with the use of 5.0 wt%W0.02-Co_(3)O_(4) as the electrocatalyst show the high reversible capacities of 1217.0 and 558.6 mAh g^(-1) at 0.2 and 5.0 C,respectively,and maintain a high reversible capacity of 644.6 mAh g^(-1) at 1.0 C(1.0 C=1675 mA g^(-1))after 500 *** a high sulfur loading of 5.5 mg cm^(-2) and electrolyte–electrode ratio of 8μL_(electrolyte) mg_(sulfur)^(-1),the 5.0 wt%W_(0.02)-Co_(3)O_(4)-based sulfur cathode also retains a high reversible areal capacity of 3.86 mAh cm^(-2) at 0.1 C after 50 cycles with an initial capacity retention of 84.7%.

关键词： catalytic additives lithium-sulfur batteries single-atomic dopant sluggish redox kinetics

Calculation of groundwater head distribution with a close barrier during excavation dewatering in confined aquifer

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Geoscience Frontiers 2021年第2期12卷 791-803页

作者： Hai-Min Lyu Shui-Long Shen Yong-Xia Wu An-Nan Zhou MOE Key Laboratory of Intelligent Manufacturing Technology Department of Civil and Environmental EngineeringCollege of EngineeringShantou UniversityGuangdongChina State Key Laboratory of Internet of Things for Smart City University of MacaoMacaoChina College of Mechanical and Automotive Engineering Shanghai University of Engineering ScienceShanghai201620China Civil and Infrastructure Discipline School of EngineeringRoyal Melbourne Institute of Technology(RMIT)MelbourneVic3001Australia

When pumping is conducted in confined aquifer inside excavation pit(waterproof curtain),the direction of the groundwater seepage outside the excavation changes from horizontal to vertical owing to the existence of the curtain *** is no analytical calculation method for the groundwater head distribution induced by dewatering inside *** paper first analyses the mechanism of the blocking effects from a close barrier in confined ***,a simple equation based on analytical solution is proposed to calculate groundwater heads inside and outside of the excavation pit with waterproof curtain(hereafter refer to close barrier)in a confined *** distribution of groundwater head is derived according to two conditions:(i)pumping with a constant water head,and(ii)pumping with a constant flow *** proposed calculation equation is verified by both numerical simulation and experimental *** comparisons demonstrate that the proposed model can be applied in engineering practice of excavation.

关键词： Confined aquifer Waterproof curtain Dewatering Groundwater head