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Energy band engineering of graphitic carbon nitride for photocatalytic hydrogen peroxide production

Carbon Energy 2024年第11期6卷 346-370页

作者： Tengyang Gao Degui Zhao Saisai Yuan Ming Zheng Xianjuan Pu Liang Tang Zhendong Lei Key Laboratory of Organic Compound Pollution Control Engineering (MOE) School of Environmental and Chemical Engineering Shanghai UniversityShanghaiChina National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization Huaiyin Institute of TechnologyHuaianChina School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiangChina College of Environmental & Engineering Tongji UniversityShanghaiChina School of Materials Science and Engineering Nanyang Technological UniversitySin gaporeSingapore

Hydrogen peroxide(H_(2)O_(2))is one of the 100 most important chemicals in the world with high energy density and environmental *** with anthraquinone oxidation,direct synthesis of H_(2)O_(2) with hydrogen(H_(2))and oxygen(O_(2)),and electrochemical methods,photocatalysis has the characteristics of low energy consumption,easy operation and less pollution,and broad application prospects in H_(2)O_(2) *** photocatalysts,such as titanium dioxide(TiO_(2)),graphitic carbon nitride(g-C_(3)N_(4)),metal-organic materials,and nonmetallic materials,have been studied for H_(2)O_(2) *** them,g-C_(3)N_(4) materials,which are simple to synthesize and functionalize,have attracted wide *** electronic band structure of g-C_(3)N_(4) shows a bandgap of 2.77 eV,a valence band maximum of 1.44 V,and a conduction band minimum of−1.33 V,which theoretically meets the requirements for hydrogen peroxide *** comparison to semiconductor materials like TiO_(2)(3.2 eV),this material has a smaller bandgap,which results in a more efficient response to visible ***,the photocatalytic activity of g-C_(3)N_(4) and the yield of H_(2)O_(2) were severely inhibited by the electron-hole pair with high recombination rate,low utilization rate of visible light,and poor selectivity of *** previous reviews also presented various strategies to improve photocatalytic H_(2)O_(2) production,they did not systematically elaborate the inherent relationship between the control strategies and their energy band *** this point of view,this article focuses on energy band engineering and reviews the latest research progress of g-C_(3)N_(4) photocatalytic H_(2)O_(2) *** this basis,a strategy to improve the H_(2)O_(2) production by g-C_(3)N_(4) photocatalysis is proposed through morphology control,crystallinity and defect,and doping,combined with other materials and other ***,the challenges and prospect

关键词： energy band engineering graphitic carbon nitride hydrogen peroxide photocatalysis various strategies

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Substantial grain refinement of Al-Mn-Si alloys me diate d by collaborative effect of Al-5Ti-1B refiner and sub-rapid solidification

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Journal of Materials Science & technology 2024年第20期187卷 230-239页

作者： Yong-Si Wei Cheng Wang Jiang You Dong Qiu Yipeng Gao Hong Xu Jin Xu Hui-Yuan Wang Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Nanling CampusJilin UniversityNo.5988 Renmin StreetChangchun130025China Center for Additive Manufacturing School of EngineeringRMIT UniversityMelbourneVIC3001Australia State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Material Science and EngineeringHebei University of TechnologyTianjin300130China

The mechanical properties of as-cast metallic materials depend strongly on the size and shape of grains,which are critical microstructural parameters dictated by the interplay of nucleation and growth of crys-talline solids during *** our experiments,the microstructure transition from coarse colum-nar crystals into fine equiaxed crystals for dilute Al-Mn-Si alloys was achieved by using sub-rapid so-lidification with the addition of Al-5Ti-1B grain *** average grain size of Al alloy was reduced from a millimeter size to 73μ*** temperature gradient calculation,we found that the acqui-sition of fine equiaxed crystals could be attributed to the existence of a high number density of TiB2,acting as effective nucleation sites with an increase in total ***,the curvature su-percooling,constitutional undercooling,thermal undercooling,and kinetic undercooling during sub-rapid solidification were quantitatively determined for given solidification *** results showed that con-stitutional undercooling,rather than thermal undercooling,was primarily responsible for the formation of fine equiaxed grains,with the assistance of Al-5Ti-1B grain *** work provides a new insight into the grain refining mechanism under sub-rapid solidification.

关键词： Aluminum alloys Sub-rapid solidification Columnar-to-equiaxed transition Grain refinement

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Distribution and influencing factors of microeukaryote in different water layers of the southwestern Indian Ocean Ridge

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Journal of Oceanology and Limnology 2024年第5期42卷 1525-1539页

作者： Zhong LI Chao YUAN Ping SUN Mingzhu FU Xuelei ZHANG Zongling WANG Qinzeng XU College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Marine Eco-Environmental Science and Technology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China

Microeukaryotes play a vital role in shaping marine ecosystems,especially in marine productivity,the microbial food web,and carbon *** Indian Ocean is one of the largest oligotrophic areas in the world,but little is known about the biodiversity of microeukaryotes in the *** community composition and geographical distribution of microeukaryotes collected from the surface(SUR)and deep chlorophyll maximum(DCM)layers in the southwestern Indian Ocean were studied using high-throughput sequencing of the 18S rRNA *** metagenomic data helped quantify the impact of environmental factors on microeukaryotic *** relative abundance of different taxa groups exhibited distinct patterns between SUR and DCM layers,except for the most dominant Dinoflagellata that accounted for more than 40.6%abundance in each *** was much more abundant in the nutrient-rich DCM layer than the SUR *** community similarity of microeukaryotes decreased with increasing of geographic distance,whereas the temperature and inorganic nitrogen were the most important environmental parameters to community *** communities were more influenced by dispersal limitations and rare communities were more responsive to environmental *** network analyses revealed strong biotic interactions indicative of parasitism,predation and competition,and their contribution to microeukaryotic population in diverse ***,this study provided insights into the biodiversity of microeukaryotes by characterizing the differences between water layers and identifying the driving factors in the ocean.

关键词： microeukaryote southwestern Indian Ocean community structure environmental factor biotic interaction Dinoflagellata

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Recent advances,challenges,and perspectives on carbon capture

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Frontiers of environmental Science & engineering 2024年第6期18卷 75-104页

作者： Shihan Zhang Yao Shen Chenghang Zheng Qianqian Xu Yifang Sun Min Huang Lu Li Xiongwei Yang Hao Zhou Heliang Ma Zhendong Li Yuanhang Zhang Wenqing Liu Xiang Gao Institute of Energy and Sustainable Development Zhejiang University of TechnologyHangzhou 310014China College of Environment Zhejiang University of TechnologyHangzhou 310014China Baima Lake Laboratory Hangzhou 310051China Institute of Carbon Neutrality College of Energy EngineeringZhejiang UniversityHangzhou 310027China State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHFIPSChinese Academy of SciencesHefei 230031China

Carbon capture,utilization and storage(CCUS)technologies play an essential role in achieving Net Zero Emissions *** the lack of timely reviews on the recent advancements in promising CCUS technologies,it is crucial to provide a prompt review of the CCUS advances to understand the current research gaps pertained to its industrial *** that end,this review first summarized the developmental history of CCUS technologies and the current large-scale ***,based on a visually bibliometric analysis,the carbon capture remains a hotspot in the CCUS *** that the materials applied in the carbon capture process determines its *** a result,the state-of-the-art carbon capture materials and emerging capture technologies were comprehensively summarized and *** between state-of-art carbon capture process and its ideal counterpart are analyzed,and insights into the research needs such as material design,process optimization,environmental impact,and technical and economic assessments are provided.

关键词： Carbon capture,utilization and storage Visualization analysis Research hotspots and trends CO_(2)capture technology

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Selective hydrodeoxygenation of polyethylene terephthalate plastic wastes into 1;4-dimethylcyclohexane by Ir-ReO_(x)/SiO_(2)+HZSM-5 catalytic system

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Science China Chemistry 2025年第4期68卷 1563-1575页

作者： Nan Wang Jieyi Liu Junde Wei Sibao Liu Guozhu Liu Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin 300072China Engineering Research Center of Polymer Green Recycling of Ministry of Education Fujian Key Laboratory of Pollution Control&Resource ReuseCollege of Environmental and ResourcesFujian Normal UniversityFuzhou 350007China Haihe Lab of Sustainable Chemical Transformations Tianjin 300192China

In order to mitigate the environmental impact of polyethylene terephthalate(PET)plastic pollution and enhance waste resource utilization;we developed a novel Ir-ReO_(x)/SiO_(2)+HZSM-5 catalytic system for the hydrodeoxygenation(HDO)of PET plastic wastes into cycloalkanes;particularly 1;4-dimethylcyclohexane(DMCH).Under mild conditions(190℃;3 MPa H_(2))with a certain amount of water in cyclopentane solvent;the highest yield of DMCH reached 95.8%;contributing to an overall yield of cycloalkanes at 98.4%within a reaction time of 4 h from HDO of virgin *** HDO of PET into DMCH involved initial hydrogenation of PET aromatic ring;then depolymerized by direct hydrogenolysis of acyl C-O bond in the ester group and subsequent cascade HDO of alcoholic C-O bond to saturated ester and alcohol intermediates;and further HDO of these oxygenates converting into desired DMCH *** Ir-ReO_(x)/SiO_(2) catalyst exhibits fully reduced metallic Ir nanoparticles along with partially reduced ReO_(x) species that are highly dispersed on both SiO_(2) surface and Ir nanoparticle *** oxophilic nature of ReO_(x) species facilitates the activation of C-O bonds;the acidic HZSM-5 zeolite for the promotion of dehydration reaction;and the protic property of H_(2)O for the enhancement of hydrogenation PET contributed to highly HDO activity of this ***;the catalytic system is applicable for the HDO of diverse real-world PET plastic wastes including Coca-ColaTM bottles;green Sprite bottles and white and red discarded fiber cloths;generating DMCH with a yield of up to 95.9%and cycloalkanes with a yield of up to 99.5%.This innovative process presents a new avenue for efficient hydrodeoxygenation conversion of PET into easily separable DMCH which serves as a crucial building block for the production of terephthalic acid to realize the chemical recycling of PET plastic wastes towards a green circular economy.

关键词： plastic wastes PET hydrodeoxygenation cycloalkane Ir-ReO_(x)/SiO_(2)

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Exploring the mechanism of a novel cationic surfactant in bastnaesite flotation via the integration of DFT calculations,in-situ AFM and electrochemistry

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International Journal of Mining Science and technology 2024年第10期34卷 1475-1484页

作者： Chang Liu Longhua Xu Jiushuai Deng Zhiguo Han Yi Li Jiahui Wu Jia Tian Donghui Wang Kai Xue Jinmei Fang School of Chemical&Environmental Engineering China University of Mining&Technology(Beijing)Beijing 100083China Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of Education Southwest University of Science and TechnologyMianyang 621010China State Key Laboratory of Mineral Processing Beijing 100160China

Effectively separating bastnaesite from calcium-bearing gangue minerals(particularly calcite)presents a formidable challenge,making the development of efficient collectors *** achieve this,we have designed and synthesized a novel,highly efficient,water-soluble cationic collector,N-dodecylisopropanolamine(NDIA),for use in the bastnaesite-calcite flotation *** functional theory(DFT)calculations identified the amine nitrogen atom in NDIA as the site most susceptible to electrophilic attack and electron *** introducing an OH group into the traditional collector dodecylamine(DDA)structure,NDIA provided additional adsorption sites,enabling synergistic adsorption on the surface of bastnaesite,thereby significantly enhancing both the floatability and selectivity of these *** recovery of bastnaesite was 76.02%,while the calcite was 1.26%.The NDIA markedly affected the zeta potential of bastnaesite,while its impact on calcite was relatively *** Fourier-transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS)results elucidated that the―NH―and―OH groups in NDIA anchored onto the bastnaesite surface through robust electrostatic and hydrogen bonding interactions,thereby enhancing bastnaesite's affinity for ***,in situ atomic force microscopy(AFM)provided conclusive evidence of NDIA aggregation on the bastnaesite surface,improving contact angle and hydrophobicity,and significantly boosting the flotation recovery of bastnaesite.

关键词： Novel cationic surfactant DFT calculation Bastnaesite Electrochemistry In-situ AFM

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Electrospinning engineering of gas electrodes for high-performance lithium-gas batteries

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Carbon Energy 2024年第10期6卷 353-398页

作者： Jingzhao Wang Xin Chen Jianan Wang Xiangming Cui Ze Wang Guangpeng Zhang Wei Lyu Maxim Shkunov S.Ravi P.Silva Yaozu Liao Kai Yang Wei Yan State Key Laboratory of Multiphase Flow in Power Engineering Department of Environmental Science and EngineeringSchool of Energy and Power EngineeringXi'an Jiaotong UniversityXi'anChina Advanced Technology Institute University of SurreyGuildfordSurreyUK State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghaiChina

Lithium-gas batteries(LGBs)have garnered significant attention due to their impressive high-energy densities and unique gas conversion ***,the practical application of LGBs faces substantial challenges,including sluggish gas conversion kinetics inducing in low-rate performance and high overpotential,along with limited electrochemical reversibility leading to poor cycle *** imperative task is to develop gas electrodes with remarkable catalytic activity,abundant active sites,and exceptional electrochemical ***,a versatile and well-established technique for fabricating fibrous nanomaterials,has been extensively explored in LGB *** this work,we emphasize the critical structure-property for ideal gas electrodes and summarize the advancement of employing electrospun nanofibers(NFs)for performance enhancement in *** elucidating the fundamental principles of LGBs and the electrospinning technique,we focus on the systematic design of electrospun NF-based gas electrodes regarding optimal structural fabrication,catalyst handling and activation,and catalytic site optimization,as well as considerations for large-scale *** demonstrated principles and regulations for electrode design are expected to inspire broad applications in catalyst-based energy applications.

关键词： carbon nanofibers electrocatalyst electrospinning gas electrodes metal-gas batteries

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Electrochemistry and DFT study of galvanic interaction on the surface of monoclinic pyrrhotite(001)and galena(100)

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International Journal of Mining Science and technology 2024年第8期34卷 1151-1162页

作者： Tingsheng Qiu Kaiwei Ding Huashan Yan Liu Yang Hao Wu Guanfei Zhao Xianhui Qiu College of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China Jiangxi Provincial Key Laboratory of Low-Carbon Processing and Utilization of Strategic Metal Mineral Resources Ganzhou 341000China Jiangxi Environmental Engineering Vocational College Ganzhou 341000China

The electrochemical interaction between galena and monoclinic pyrrhotite was investigated to examine its impact on the physical and chemical properties of the mineral *** investigation employed techniques such as electrochemistry,metal ion stripping,X-ray photoelectron spectroscopy,and quantum *** electrochemical test results demonstrate that the galena surface in the electro-couple system exhibits a lower electrostatic potential and higher electrochemical activity compared to the monoclinic pyrrhotite surface,rendering it more susceptible to oxidation *** pyrrhotite significantly amplifies the corrosion rate of the galena *** charge population calculations indicate that electrons are consistently transferred from galena to monoclinic pyrrhotite,with the number of electron transfers on the mineral surface increasing as the interaction distance *** analysis of state density revealed a shift in the surface state density of galena towards lower energy levels,resulting in decreased reactivity and increased difficulty for the reagent to adsorb onto the mineral ***,monoclinic pyrrhotite exhibited an opposite *** X-ray photoelectron spectroscopy(XPS)test results indicate that galvanic interaction leads to the formation of hydrophilic substances,PbS_(x)O_(y) and Pb(OH)_(2),on the surface of ***,the surface of monoclinic pyrrhotite not only adsorbs Pb^(2+)but also undergoes S^(0) formation,thereby augmenting its hydrophobic nature.

关键词： Electrochemistry Galvanic interaction Monoclinic pyrrhotite Galena Density functional theory

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Cu-based materials for electrocatalytic CO_(2) to alcohols:Reaction mechanism,catalyst categories,and regulation strategies

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Journal of Energy Chemistry 2024年第10期97卷 593-611,I0013页

作者： Yaru Lei Yaxin Niu Xiaolong Tang Xiangtao Yu Xiubing Huang Xiaoqiu Lin Honghong Yi Shunzheng Zhao Jiaying Jiang Jiyue Zhang Fengyu Gao Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants School of Energy and Environmental EngineeringUniversity of Science and Technology BejingBeijing 100083China Collaborative Innovation Center for Steel Technology University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Function Materials for Molecule&Structure Construction School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Electrocatalytic CO_(2) reduction reaction(CO_(2)RR)technology,which enables carbon capture storage and resource utilization by reducing CO_(2) to valuable chemicals or fuels,has become a global research hotspot in recent *** the many products of CO_(2)RR(carbon monoxide,acids,aldehydes and alcohols,olefins,etc.),alcohols(methanol,ethanol,propanol,etc.)have a higher market value and energy density,but it is also more difficult to *** is known to be effective in catalyzing CO_(2) to high valueadded alcohols,but with poor *** progress of Cu-based catalysts for the selective generation of alcohols,including copper oxides,bimetals,single atoms and composites is ***,to improve Cu-based catalyst activity and modulate product selectivity,the modulation strategies are straighten out,including morphological regulation,crystalline surface,oxidation state,as well as elemental doping and defect *** on the research progress of electrocatalytic CO_(2) reduction for alcohol production on Cu-based materials,the reaction pathways and the key intermediates of the electrocatalytic CO_(2)RR to methanol,ethanol and propanol are ***,the problems of traditional electrocatalytic CO_(2)RR are introduced,and the future applications of machine learning and theoretical calculations are *** in-depth discussion and a comprehensive review of the reaction mechanism,catalyst types and regulation strategies were carried out with a view to promoting the development of electrocatalytic CO_(2)RR to alcohols.

关键词： Electrocatalytic CO_(2)RR Cu-based catalyst Alcohols Reaction mechanism Regulation strategies

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Simulation Analysis of Sound Field Characteristics of Spacecraft Cabin Leakage in Orbit Under Multi-Working Conditions 9

Simulation Analysis of Sound Field Characteristics of Spacec...

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9th International Conference on Advances in Machinery, Materials Science and engineering Applications, MMSE 2023

作者： Sun, Wei Li, Zheng Wang, Lina Ren, Guohua Sun, Lichen Jiang, Lixiang Yan, Rongxin Sun, Jipeng Beijing Institute of Satellite Environment Engineering Beijing100094 China Key Laboratory of Reliability and Environmental Engineering Technology Beijing100094 China Harbin Institute of Technology Harbin150006 China

ISBN: (纸本)9781643684383

For manned on-orbit space station system, leakage will reduce the air pressure in the cabin, and seriously endanger the astronauts life safety, so it is urgent to locate the leakage hole quickly. Based on this, this paper establishes a simulation model of leakage flow field and sound field, and analyzes the influence of leakage hole diameter on the characteristics of leakage sound field under the condition of atmospheric leakage to vacuum. The results show that with the increase of hole diameter, the leakage velocity field and the maximum turbulent kinetic energy will increase, but the maximum turbulent dissipation will decrease, and the fluid velocity at the outlet of smooth hole is slightly higher than that of rough hole. The distribution of sound pressure level of low-voltage dipole sound source is relatively uniform. The distribution of sound pressure level of quadrupole sound source is radially outward. The research in this paper can provide technical support for subsequent leakage location. © 2023 The Authors.

关键词： Acoustic fields

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