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Dendritic BiVO4 decorated with MnOx co-catalyst as an efficient hierarchical catalyst for photocatalytic ozonation

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Frontiers of Chemical Science and Engineering 2019年第1期13卷 185-191页

作者： Jin Yang Xuelian Liu Hongbin Cao Yanchun Shi Yongbing Xie jiadong xiao School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Beijing Engineering Research Center of Process Pollution Control CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

An appropriate co-catalyst can significantly promote the photocatalytic efficacy, but this has been seldom studied in the visible-light photocatalysis combined with ozone, namely photocatalytic ozonation. In this work, a dendritic bismuth vanadium tetraoxide (BiVO4) material composited with highly dispersed MnOv nanoparticles was synthesized, and its catalytic activity is 86.6% higher than bare BiVO4 in a visible light and ozone combined process. Catalytic ozonation experiments, ultraviolet- visible (UV-Vis) diffuse reflectance spectra and photoluminescence spectra jointly indicate that MnOA plays a triple role in this process. MnOv strengthens the light adsorption and promotes the charge separation on the composite material, and it also shows good activity in catalytic ozonation. The key reactive species in this process is OH, and various pathways for its generation in this process is proposed. This work provides a new direction of catalyst preparation and pushes forward the application of photocatalytic ozonation in water treatment.

关键词： manganese oxide bismuth vanadium tetraoxide photocatalytic ozonation hydroxyl radical cocatalyst

Activated carbon enhanced ozonation of oxalate attributed to HO·oxidation in bulk solution and surface oxidation: Effect of activated carbon dosage and pH

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Journal of Environmental Sciences 2014年第10期26卷 2095-2105页

作者： Linlin Xing Yongbing Xie Daisuke Minakata Hongbin Cao jiadong xiao Yi Zhang John C. Crittenden National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing Engineering Research Center of Process Pollution Control University of Chinese Academy of Sciences Department of Civil and Environmental Engineering Michigan Technological UniversityHoughton MI 49931 United States School of Civil and Environmental Engineering Brook Byers Institute for Sustainable Systems Georgia Institute of TechnologyAtlantaGA 30332 United States

Ozonation of oxalate in aqueous phase was performed with a commercial activated carbon（AC）in this work. The effect of AC dosage and solution pH on the contribution of hydroxyl radicals（HOU） in bulk solution and oxidation on the AC surface to the removal of oxalate was studied. We found that the removal of oxalate was reduced by tert-butyl alcohol（tBA） with low dosages of AC,while it was hardly affected by tBA when the AC dosage was greater than 0.3 g/L. tBA also inhibited ozone decomposition when the AC dosage was no more than 0.05 g/L, but it did not work when the AC dosage was no less than 0.1 g/L. These observations indicate that HOUin bulk solution and oxidation on the AC surface both contribute to the removal of oxalate. HOU oxidation in bulk solution is significant when the dosage of AC is low, whereas surface oxidation is dominant when the dosage of AC is high. The oxalate removal decreased with increasing pH of the solution with an AC dosage of 0.5 g/L. The degradation of oxalate occurs mainly through surface oxidation in acid and neutral solution, but through HOUoxidation in basic bulk solution. A mechanism involving both HOUoxidation in bulk solution and surface oxidation was proposed for AC enhanced ozonation of oxalate.

关键词： Activated carbon Oxalate Ozonation Hydroxyl radicals Surface oxidation Catalytic ozonation

A near-infrared fluorescent probe for visualizing transformation pathway of Cys/Hcy and H2S and its applications in living system

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Chinese Chemical Letters 2024年第5期35卷 296-301页

作者： Yudi Cheng xiao Wang Jiao Chen Zihan Zhang jiadong Ou Mengyao She Fulin Chen Jianli Li Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education Xi’an Key Laboratory of Functional Supramolecular Structure and MaterialsCollege of Chemistry&Materials ScienceNorthwest UniversityXi’an 710127China Key Laboratory of Resource Biology and Biotechnology in Western China Ministry of EducationBiomedicine Key Laboratory of Shaanxi ProvinceLab of Tissue Engineeringthe College of Life SciencesFaculty of Life Science&MedicineNorthwest UniversityXi’an 710069China

Sulfydryl-contained(-SH)substances including hydrogen sulfide(H_(2)S),cysteine(Cys),homocysteine(Hcy)and glutathione(GSH)play crucial roles in living systems,and their variations are closely associated with various ***,we developed a near-infrared intramolecular charge transfer(ICT)based fluorescent probe Y-NBD,achieving detection of Cys/Hcy and H_(2)S with different fluorescent signals(green-red for Cys/Hcy,red for H_(2)S),large Stokes shifts(∼100/105nm or 191 nm)and high signal-background-ratio,but not responding to GSH.Y-NBD was successfully applied to image exogenous/endogenous Cys/Hcy and H_(2)S in various living cancer cells(HeLa,A549,and HepG2)and in *** not only visualized the transformation pathway of several thiols in HepG2 cells but also verified that the intestine is the main site for the activation and metabolism of Y-NBD in zebrafish,as well as realized to evaluate the degree of drug-induced liver *** work provides a promising tool for imaging Cys/Hcy and H_(2)S in living systems and shows great potency in evaluating drug-induced liver injury and its treatment.

关键词： Fluorescent probe Near-infrared Hydrogen sulfide Cysteine/homocysteine Large Stokes shift Dicyanoisophorone Drug-induced liver injury

Efficient visible-light-driven water oxidation by single-crystal Ta_(3)N_(5)nanoparticles

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Nano Research 2023年第4期16卷 4562-4567页

作者： Zheng Wang Jeongsuk Seo Takashi Hisatomi Mamiko Nakabayashi jiadong xiao Shanshan Chen Lihua Lin Zhenhua Pan Mary Krause Nick Yin Gordon Smith Naoya Shibata Tsuyoshi Takata Kazunari Domen Research Initiative for Supra-Materials Interdisciplinary Cluster for Cutting Edge ResearchShinshu University4-17-1 WakasatoNagano-shiNagano 380-8553Japan Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Institute of Engineering Innovation The University of Tokyo2-11-16 YayoiBunkyo-kuTokyo 113-8656Japan Global Advanced Metals Inc. 1223 County Line RoadBoyertownPA 19512USA Office of University Professors The University of Tokyo2-11-16 YayoiBunkyo-kuTokyo 113-8656Japan

Ta3N5 is regarded as a promising photocatalyst for solar water splitting because of its excellent visible light absorption characteristics and simple *** Ta3N5 photocatalysts prepared from oxide precursors typically comprise aggregated polycrystalline particles with defects and grain boundaries that reduce the water oxidation activity of the *** the present work,well-dispersed Ta3N5 nanoparticulate single crystals were synthesized via a mild nitridation process using pure Ta metal nanopowder or Ta nanopowder mixed with *** resulting high-quality Ta3N5 nanoparticles,after loading with an oxygen evolution cocatalyst,exhibited impressively high photocatalytic performance during O_(2)evolution from a sacrificial AgNO3 solution,with an apparent quantum yield of 9.4%at 420 *** findings suggest a new approach to the facile fabrication of nanostructured single-crystal photocatalysts for efficient solar water splitting,based on the use of metal nanopowders.

关键词： Ta3N5 photocatalyst nanoparticle single crystal O_(2)evolution metallic Ta precursor

Stabilizing high-efficiency iridium single atoms via lattice confinement for acidic oxygen evolution

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Nano Research 2024年第4期17卷 2492-2498页

作者： Yibo Wang jiadong Jiang Zhaoping Shi Hongxiang Wu Jiahao Yang Pengbo Wang Shuai Hou Meiling xiao Junjie Ge Changpeng Liu Wei Xing Laboratory of Advanced Power Sources Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026.China State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Jilin Province Key Laboratory of Low Carbon Chemical Power Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Key Laboratory of Physics and Technology for Advanced Batteries Ministry of EducationCollege of PhysicsJilin UniversityChangchun 130012China

Stable and efficient single atom catalysts(SACs)are highly desirable yet challenging in catalyzing acidic oxygen evolution reaction(OER).Herein,we report a novel iridium single atom catalyst structure,with atomic Ir doped in tetragonal PdO matrix(IrSAs-PdO)via a lattice-confined *** optimized IrSAs-PdO-0.10 exhibited remarkable OER activity with an overpotential of 277 mV at 10 mA·cm^(-2) and long-term stability of 1000 h in 0.5 M H_(2)SO_(4).Furthermore,the turnover frequency attains 1.6 s^(-1) at an overpotential of 300 mV with a 24-fold increase in the intrinsic *** high activity originates from isolated iridium sites with low valence states and decreased Ir–O bonding covalency,and the excellent stability is a result of the effective confinement of iridium sites by Ir–O–Pd ***,we demonstrated for the first time that SACs have great potential in realizing ultralow loading of iridium(as low as microgram per square center meter level)in a practical water electrolyzer.

关键词： lattice confinement iridium single atoms ultralow iridium loading acidic oxygen evolution proton exchange membrane water electrolysis

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基于自适应迭代的机器人曲面恒力跟踪

北京航空航天大学学报 2019年第4期45卷 641-649页

作者：李琳肖佳栋张铁肖蒙华南理工大学机械与汽车工程学院广州510640

针对利用机器人进行打磨、抛光、去毛刺等场合时末端执行器对曲面工件轮廓跟踪时难以得到恒定接触力的问题,对机器人末端执行器和工件轮廓接触时的接触力进行研究,建立了实际跟踪过程中机器人末端执行器的接触力和已知传感器坐标系的映... 详细信息

针对利用机器人进行打磨、抛光、去毛刺等场合时末端执行器对曲面工件轮廓跟踪时难以得到恒定接触力的问题,对机器人末端执行器和工件轮廓接触时的接触力进行研究,建立了实际跟踪过程中机器人末端执行器的接触力和已知传感器坐标系的映射关系,提出了一种基于自适应迭代学习算法的机器人力/位混合曲面恒力跟踪控制方法。该方法由两部分组成:基于机器人和环境接触时的阻抗模型设计了迭代学习控制律,在PD反馈控制的基础上通过迭代项克服机器人的未知参数和不确定性,并构建Lyapunov能量函数证明所提控制律的收敛性;将迭代学习控制律和力/位混合曲面恒力跟踪控制方法结合起来设计了用于曲面工件轮廓跟踪的控制方法。实验结果显示,经过15次迭代,接触力的波动范围逐渐变小并稳定在±3 N之内,验证了所提方法的有效性。

关键词：机器人曲面跟踪恒力控制力/位混合控制自适应迭代学习

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基于模糊迭代算法的曲面恒力跟踪

上海交通大学学报 2020年第4期54卷 344-351页

作者：张铁肖蒙邹焱飚肖佳栋华南理工大学机械与汽车工程学院广州510640

针对机器人末端执行器对曲面轮廓跟踪时难以得到恒定跟踪力的问题,对机器人末端执行器和曲面轮廓的接触力进行了研究,建立了研究对象曲面法向力和已知传感器坐标系的映射关系,提出了一种模糊迭代算法.模糊迭代算法不需要得到系统内部传... 详细信息

针对机器人末端执行器对曲面轮廓跟踪时难以得到恒定跟踪力的问题,对机器人末端执行器和曲面轮廓的接触力进行了研究,建立了研究对象曲面法向力和已知传感器坐标系的映射关系,提出了一种模糊迭代算法.模糊迭代算法不需要得到系统内部传递函数,简化了建模设计,同时,模糊迭代算法根据上次实验力误差以及误差变化量模糊补偿机器人的轨迹,加快了收敛速度,文中在理论上证明了模糊迭代算法有界收敛.实验结果显示:接触力的波动范围在±3 N之内,验证了此算法的可行性,相比于传统的比例微分(PD)算法,接触力误差波动的均方差减少了42%;相比于未进行模糊补偿的算法,在所选择的时间段内迭代周期至少减了1次.

关键词：机器人曲面跟踪恒力控制模糊算法迭代算法

Metal-organic polyhedra as dynamic cross-linker for recyclable mixed matrix membranes with promising dimension stability

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Science China Chemistry 2024年

作者： Linjie Lan Mingxin Zhang Haiyan xiao Liufu Wei Yuyan Lai jiadong Chen Jiafu Yin Panchao Yin State Key Laboratory of Luminescent Materials and Devices&South China Advanced Institute for Soft Matter Science and Technology Guangdong Basic Research Center of Excellence for Energy and Information Polymer MaterialsSouth China University of Technology State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan University

Mixed matrix membranes （MMMs） are designed by incorporating microporous inorganic fillers into polymer matrix for the integration of inorganics’excellent gas separation performance with polymers’promising ***,due to the complex interphase interaction,the prevention of long-term aging is still challenging and the poor processability/recyclability of MMMs hinders their extensive ***,a coordination assembly protocol is developed for the fabrication of MMMs with both excellent processability/recyclability upon thermal annealing and promising dimension stability even under high gas *** bearing isophthalic acid （IPA） as side chains are applied to coordinate with Cu2+and the assembled 2.5 nm microporous metal-organic polyhedra （MOP）,{Cu24IPA24},serves as multi-functional cross-linkers for the polymer network *** MOPs’well-defined microporosity grants MMMs the capability for O2/N2separation while their activated dynamics at high temperatures （>120°C） endows polymer networks with excellent *** contrast to conventional supramolecular units,the MOPs possess unique logarithmic ligand-exchange kinetics and they show nearly frozen bonding dynamics at room temperature,ensuring promising dimensional stability to overcome the long-term aging and high gas pressure *** work not only provides fundamental understanding of the unique relaxation dynamics of complex systems with intertwined dynamics of supramolecular bonds and polymer chains,but also paves new avenues for the fabrication of robust and recyclable MMMs and elastomers.

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2.5维有限/无限元法分析沟渠对列车引起振动的隔振研究

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建筑结构 2021年第S1期51卷 973-979页

作者：肖佳栋梁徐杰河北建筑设计研究院有限责任公司石家庄050000

近年来为了缓解城市的交通拥堵问题,城市建立了越来越多的轨道交通系统。列车行驶引起的周围环境的振动问题受到越来越多工程界和学术界的关注,本文首先研究了移动荷载引起的半空间稳态动力响应问题,并将2.5维数值解和理论解进行对比验... 详细信息

近年来为了缓解城市的交通拥堵问题,城市建立了越来越多的轨道交通系统。列车行驶引起的周围环境的振动问题受到越来越多工程界和学术界的关注,本文首先研究了移动荷载引起的半空间稳态动力响应问题,并将2.5维数值解和理论解进行对比验证。通过假定土壤-结构系统属性沿着轨道方向保持不变,将列车荷载简化为移动点荷载,研究沟渠的隔振效果。研究表明,沟渠对高自振频率的隔振效果较低频率好;远处观测点隔振效果与沟渠位置关系不大;低振动频率移动荷载,需要较深的沟渠才能取得较好的隔振效果;增大沟渠宽度对隔振效果提升并不显著。

关键词： 2.5维方法无限元隔振沟渠