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Self-assembly synthesis of phosphorus-doped tubular g-C_(3)N_(4);Ti_(3)C_(2)MXene Schottky junction for boosting photocatalytic hydrogen evolution

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Green Energy & Environment 2023年第1期8卷 233-245页

作者： Kelei Huang Chunhu Li Xiuli Zhang Liang wang wentai wang Xiangchao Meng Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao266100China

Establishing highly effective charge transfer channels in carbon nitride(g-C_(3)N_(4)) to enhance its photocatalytic activity is still a challenging issue.Herein,the delaminated 2D Ti_(3)C_(2) MXene nanosheets were employed to decorate the P-doped tubular g-C_(3)N_(4)(PTCN)for engineering 1D/2D Schottky heterojunction(PTCN/TC)through electrostatic self-assembly.The optimized PTCN/TC exhibited the highest hydrogen evolution rate(565 μmol h^(-1)g^(-1)),which was 4.3 and 2.0-fold higher than pristine bulk g-C_(3)N_(4) and PTCN,respectively.Such enhancement may be primarily attributed to the phosphorus heteroatom doped and unique structure of 1D/2D g-C_(3)N_(4)/Ti_(3)C_(2) Schottky heterojunction,enhancing the light-harvesting and charges’separation.One-dimensional pathway of g-C_(3)N_(4) tube and built-in electric field of interfacial Schottky effect can significantly facilitate the spatial separation of photogenerated charge carriers,and simultaneously inhibit their recombination via Schottky barrier.In this composite,metallic Ti_(3)C_(2) was served as electrons sink and photons collector.Moreover,ultrathin Ti_(3)C_(2) flake with exposed terminal metal sites as a co-catalyst exhibited higher photocatalytic reactivity in H2 evolution compared to carbon materials(such as reduced graphene oxide).This work not only proposed the mechanism of tubular g-C_(3)N_(4)/Ti_(3)C_(2) Schottky junction in photocatalysis,but also provided a feasible way to load ultrathin Ti_(3)C_(2) as a co-catalyst for designing highly efficient photocatalysts.

关键词： Tubular g-C_(3)N_(4) Ti_(3)C_(2)MXene Schottky junction Photocatalyst Hydrogen evolution

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Copper nanowires decorated with TiO_(2−x) from MXene for enhanced electrocatalytic nitrogen oxidation into nitrate under vacuum assistance

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Nano Research 2023年第10期16卷 12357-12362页

作者： Quan Li Zhengting Xiao Weina Jia Qin Li Xianguo Li wentai wang Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China Key Laboratory of Biofuels Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China Queensland Micro-and Nanotechnology Centre School of Engineering and Built EnvironmentGriffith University Nathan CampusBrisbaneQLD 4111Australia

The green synthesis of nitrate(NO_(3)^(−))via electrocatalytic nitrogen oxidation reaction(NOR)is a promising strategy for artificial nitrogen fixation,which shows great advantages than traditional nitrate synthesis based on Haber–Bosch and Ostwald processes.But the poor N_(2)absorption,high bond energy of N≡N(941 kJ·mol^(−1)),and competing multi-electron-transfer oxygen evolution reaction(OER)limit the activity and selectivity.Herein,we fabricated MXene-derived irregular TiO_(2)−x nanoparticles anchored Cu nanowires(Cu-NWs)electrode for efficient electrocatalytic nitrogen oxidation,which exhibits a NO_(3)−yield of 62.50μg·h^(−1)·mgcat^(−1)and a Faradaic efficiency(FE)of 22.04%,and a significantly enhanced NO_(3)−yield of 92.63μg·h^(−1)·mgcat^(−1),and a FE of 40.58%under vacuum assistance.The TiO_(2)−x/Cu-NWs electrode also shows excellent reproducibility and stability under optimal experimental conditions.Moreover,a Zn-N_(2)reaction device was assembled with TiO_(2−x)/Cu-NWs as an anode and Zn plate as a cathode,obtaining an extremely high NO_(3)−yield of 156.25μg·h^(−1)·mgcat^(−1).The Zn-nitrate battery shows an open circuit voltage(OCV)of 1.35 V.This work provides novel strategies for enhancing the performance of ambient N_(2)oxidation to obtain higher NO_(3)^(−)yield.

关键词： nitrogen oxidation nitrate production electrocatalysis Zn-N_(2)system Zn-nitrate battery vacuum assistance

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Advancement in materials for energy-saving lighting devices

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Frontiers of Chemical Science and Engineering 2012年第1期6卷 13-26页

作者： Tak H.KIM wentai wang Qin LI Department of Chemical Engineering Curtin UniversityPerth 6845Australia

This review provides a comprehensive account of energy efficient lighting devices, their working principles and the advancement of these materials as an underpinning to the development of technology. Particular attention has been given to solid state lighting devices and their applications since they have attracted the most interest and are the most promising. Solid state lighting devices including white light emitting diodes （LEDs）, organic LEDs （OLEDs）, quantum-dot LEDs （QLEDs） and carbon-dot LEDs （CLEDs） are promising energy efficient lighting sources for displays and general lighting. However there is no universal solution that will give better performance and efficiency for all types of applications. LEDs are replacing traditional lamp,; for both general lighting and display applications, whereas OLEDs are finding their own special application,; in various areas. QLEDs and CLEDs have advantages such as high quantum yields, narrow emission spectra, tunable emission spectra and good stability over OLEDs, so applications for these devices are being extended to new types of lighting sources. There is a great dean of research on these materials and their processing technologies and the commercial viability of these technologies appears strong.

关键词： energy-saving lighting devices solid statelighting devices

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Photo-reduction of NO by g-C3N4@foamed ceramic

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Chinese Journal of Chemical Engineering 2020年第7期28卷 1840-1846页

作者： Rui Zheng Chunhu Li Chengzhen Zhang wentai wang Liang wang Lijuan Feng Junjie Bian Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China

G-C3N4 was supported on the surface of foamed ceramic,and the g-C3N4@foamed ceramic was packed in the photocatalytic reactor in a layered manner.Effects of urea and H2O2 concentration on NO conversion were investigated.Pulse experiments were carried out to investigate the change of NO conversion with time under different concentrations of H2O2.The contribution of each route that NO converted and the selectivities of products were calculated.Results showed that the photo-reduction of NO accounted for 2%,and the photo-oxidation of NO accounted for 14%,and the rest was absorbed by the humidifier.Products include ammonia(NH+4-N),nitrogen(N2),nitrite(NO-2-N)and nitrate(NO-3-N),of which N2 accounted for 9%.

关键词： deNOX Photocatalysis g-C3N4@foamed ceramic Photo-reduction

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紫外超短脉冲激光硅表面微槽刻蚀研究

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应用激光 2024年第4期44卷 15-20页

作者：陈海鹏王浩欧阳文泰上海市激光技术研究所有限公司上海200233 上海激光智能制造工程技术研究中心上海200233 中国科学院宁波材料技术与工程研究所浙江宁波315201

硅基微流控板已经被广泛应用于微流控领域,超短脉冲激光技术提供了一种灵活、精确的硅表面微槽制造方法。为降低激光作用过程中对硅材料的热影响,使用脉冲宽度为12 ps的紫外超短脉冲激光进行刻蚀,分析不同激光功率和激光扫描次数等激光... 详细信息

硅基微流控板已经被广泛应用于微流控领域,超短脉冲激光技术提供了一种灵活、精确的硅表面微槽制造方法。为降低激光作用过程中对硅材料的热影响,使用脉冲宽度为12 ps的紫外超短脉冲激光进行刻蚀,分析不同激光功率和激光扫描次数等激光刻蚀参数对微槽的影响。在激光共聚焦显微镜的帮助下,研究不同激光参数对微槽深度变化以及微槽底部粗糙度的影响,结果显示增加激光功率和激光扫描次数能有效提升微槽深度,并且也会增加微槽底部的粗糙度。

关键词：超短脉冲激光激光刻蚀微槽硅片

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一种小型火工机构的输出计算及其验证

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宇航学报 2024年第2期45卷 231-239页

作者：杜永刚王雪松刘轶鑫康昌玺雷小光张文台孙永壮中国空间技术研究院兰州空间技术物理研究所兰州730000

针对某折叠翼展开机构的小型化难题,研究了一种小型火工机构。利用内弹道理论建立了该火工机构的输出理论模型,通过理论模型计算和优化了机构参数,并用有限元法校验了计算结果。测试结果表明:该原型机具备了小型特点,其输出角度达到了12... 详细信息

针对某折叠翼展开机构的小型化难题,研究了一种小型火工机构。利用内弹道理论建立了该火工机构的输出理论模型,通过理论模型计算和优化了机构参数,并用有限元法校验了计算结果。测试结果表明:该原型机具备了小型特点,其输出角度达到了128.5°。在逆风和顺风负载下,该火工机构的工作时间均小于200 ms,其最大角速度不大于3 000 (°)/s,试验数据证实该火工机构具备缓冲作用,理论计算结果和试验数据基本一致。研究成果可作为薄型折叠翼的一种设计方法,为薄型折叠翼的工程应用奠定技术基础。

关键词：火工机构折叠翼小型化理论模型验证

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Carbon Nitride Quantum Dots:A Novel Fluorescent Probe for Non-Enzymatic Hydrogen Peroxide and Mercury Detection

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Journal of Ocean University of China 2023年第6期22卷 1572-1582页

作者： CHEN Lei LI Quan wang Xing wang wentai wang Lisha Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China

The mercury species in the ocean(MeHg,Hg^(2+))will be enriched in marine organisms and threaten human health through the food chain.While the excessive H_(2)O_(2)in the metabolic process will produce hydroxyl radicals and accelerate the aging of human cells,causing a series of diseases.Hence,the cost-effective and rapid detection of mercury and H_(2)O_(2)is of urgent requirement and significance.Here,we synthesized emerging graphitic carbon nitride quantum dots(g-CNQDs)with high fluorescence quantum yield(FLQY)of 42.69%via a bottom-up strategy by a facile one-step hydrothermal method.The g-CNQDs can detect the H_(2)O_(2)and Hg^(2+)through the fluorescence quenching effect between g-CNQDs and detected substances.With the presence of KI,g-CNQDs show concentration-dependent fluorescence toward H_(2)O_(2),with a wide detection range of 1–1000μmolL^(-1)and a low detection limit of 0.23μmolL^(-1).The g-CNQDs also show sensitivity toward Hg^(2+)with a detection range of 0–0.1μmolL^(-1)and a detection limit of 0.038μmolL^(-1).This dual-function detection of g-CNQDs has better practical application capability compared to other quantum dot detection.This study may provide a new strategy for g-CNQDs preparation and construct a fluorescence probe that can be used in various systems involving H_(2)O_(2)and Hg^(2+),providing better support for future bifunctional or multifunction studies.

关键词： carbon nitride quantum dots hydrogen peroxide Hg2+ fluorescence probe

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Microfluidic 3D printing polyhydroxyalkanoates-based bionic skin for wound healing

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Materials Futures 2022年第1期1卷 142-153页

作者： wentai Guo Xiaocheng wang Chaoyu Yang Rongkang Huang Hui wang Yuanjin Zhao Department of Colorectal Surgery Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor DiseasesThe Sixth Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510655People’s Republic of China Institute of Biomedical Innovation and Laboratory of Regenerative Medicine and Biomaterials Biomedical Material Conversion and Evaluation Engineering Technology Research Center of Guangdong ProvinceGuangzhou 510655People’s Republic of China Wenzhou Institute University of Chinese Academy of SciencesWenzhou 325001People’s Republic of China State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096People’s Republic of China Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)Wenzhou 325001People’s Republic of China

Biomimetic scaffolds with extracellular matrix(ECM)-mimicking structure have been widely investigated in wound healing applications,while insufficient mechanical strength and limited biological activity remain major challenges.Here,we present a microfluidic 3D printing biomimetic polyhydroxyalkanoates-based scaffold with excellent mechanical properties and hierarchical porous structures for enhanced wound healing.This scaffold is composed of poly(3-hydroxybutyrate-4-hydroxybutyrate)and polycaprolactone,endowing it with excellent tensile strength(2.99 MPa)and degradability(80%of weight loss within 7 d).The ECM-mimicking hierarchical porous structure allows bone marrow mesenchymal stem cells(BMSCs)and human umbilical vein endothelial cells(HUVECs)to proliferate and adhere on the scaffolds.Besides,anisotropic composite scaffolds loaded with BMSCs and HUVECs can significantly promote re-epithelization,collagen deposition and capillary formation in rat wound defects,indicating their satisfactory in vivo tissue regenerative activity.These results indicate the feasibility of polyhydroxyalkanoates-based biomimetic scaffolds for skin repair and regeneration,which also provide a promising therapeutic strategy in diverse tissue engineering applications.

关键词： microfluidics 3D printing tissue engineering biomaterial P34HB wound healing

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新疆南疆棉花“干播湿出”种植技术应用现状、面临的问题及解决策略

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中国农学通报 2024年第3期40卷 62-65页

作者：王一琪张文太田长彦买文选新疆农业大学资源与环境学院乌鲁木齐830052 中国科学院新疆生态与地理研究所国家绿洲生态与荒漠环境重点实验室/干旱区生态安全与可持续发展重点实验室乌鲁木齐830011

棉花是新疆最重要的经济作物,而南疆又是新疆棉花的主产区,产量占全疆的80%。长期以来,南疆棉区普遍采用“湿播干出”的种植模式,即除了在棉花生育期进行常规灌溉外,还需要进行冬灌和春灌,起到压盐、提高播种期土壤墒情和改善土壤水分... 详细信息

棉花是新疆最重要的经济作物,而南疆又是新疆棉花的主产区,产量占全疆的80%。长期以来,南疆棉区普遍采用“湿播干出”的种植模式,即除了在棉花生育期进行常规灌溉外,还需要进行冬灌和春灌,起到压盐、提高播种期土壤墒情和改善土壤水分的作用。随着耕地面积的不断扩大和水资源的日益短缺,南疆棉区开始尝试采用北疆“干播湿出”的栽培方式种植棉花,但整体效果不甚理想。通过文献综述,探讨造成南疆推行“干播湿出”栽培方式不力的原因,在此基础上提出可能的解决策略。

关键词：南疆棉花干播湿出节水控盐解决策略

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Volatile organic compounds in wintertime North China Plain:Insights from measurements of proton transfer reaction time-of-flight mass spectrometer(PTR-ToF-MS)

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Journal of Environmental Sciences 2022年第4期34卷 98-114页

作者： Xianjun He Bin Yuan Caihong Wu Sihang wang Chaomin wang Yibo Huangfu Jipeng Qi Nan Ma Wanyun Xu Ming wang wentai Chen Hang Su Yafang Cheng Min Shao Institute for Environmental and Climate Research Jinan UniversityGuangzhou 511443China Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality Guangzhou 511443China State Key Laboratory of Severe Weather&Key Laboratory for Atmospheric Chemistry of China Meteorology Administration Chinese Academy of Meteorological SciencesBeijing 100081China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlSchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing 210044China Nanjing Intelligent Environmental Science and Technology Co. Ltd.Nanjing 211800China Max Planck Institute for Chemistry Mainz 55128Germany

The characteristics of wintertime volatile organic compounds(VOCs)in the North China Plain(NCP)region are complicated and remain obscure.VOC measurements were conducted by a proton transfer reaction time-of-flight mass spectrometer(PTR-ToF-MS)at a rural site in the NCP from November to December 2018.Uncalibrated ions measured by PTRToF-MS were quantified and the overall VOC compositions were investigated by combining the measurements of PTR-ToF-MS and gas chromatography-mass spectrometer/flame ionization detector(GC-MS/FID).The measurement showed that although atmospheric VOCs concentrations are often dominated by primary emissions,the secondary formation of oxygenated VOCs(OVOCs)is non-negligible in the wintertime,i.e.,OVOCs accounts for 42%±7%in the total VOCs(151.3±75.6 ppbV).We demonstrated that PTR-MS measurements for isoprene are substantially overestimated due to the interferences of cycloalkanes.The chemical changes of organic carbon in a pollution accumulation period were investigated,which suggests an essential role of fragmentation reactions for large,chemically reduced compounds during the heavy-polluted stage in wintertime pollution.The changes of emission ratios of VOCs between winter 2011 and winter 2018 in the NCP support the positive effect of“coal to gas”strategies in curbing air pollutants.The high abundances of some key species(e.***.oxygenated aromatics)indicate the strong emissions of coal combustion in wintertime of NCP.The ratio of naphthalene to C8 aromatics was proposed as a potential indicator of the influence of coal combustion on VOCs.

关键词： North China Plain Volatile organic compound Wintertime PTR-ToF-MS

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